CN215926994U

CN215926994U - Combined protective fence for building construction

Info

Publication number: CN215926994U
Application number: CN202121951734.XU
Authority: CN
Inventors: 黄明水; 赵帅; 杨金朋; 赵晓方; 于海艳
Original assignee: Individual
Current assignee: HUNAN INDUSTRIAL EQUIPMENT INSTALLATION CO LTD
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2022-03-01
Anticipated expiration: 2031-08-19

Abstract

The application discloses a combined protective guard for building construction, which comprises a warning plate and a fixing mechanism, wherein the periphery of the front side of the warning plate is provided with a reflective strip; the fixing mechanism comprises two slope plates, the two slope plates are fixedly connected with the left side and the right side of the connecting plate respectively on one sides, close to each other, of the two slope plates, and one sides, far away from each other, of the two slope plates are fixedly connected with one sides, close to each other, of the outer walls of the two cavity columns respectively. Drive the rotation of second bevel gear through first carousel, first bevel gear drives first threaded rod and rotates, the direction horizontal migration to keeping away from each other under the restriction of spacing groove respectively with two threaded sleeves of first threaded rod screw-thread fit, make two slide bars slide at spacing inslot chamber respectively, thereby promote two ramp downshifts, two cavity posts downslide simultaneously, make connecting plate and bottom plate contact ground respectively, the pulley breaks away from ground, realize the fixed of device, the rethread is fixed the device on ground with the staple, increase the fixed effect of device.

Description

Combined protective fence for building construction

Technical Field

The application relates to the field of building construction, in particular to a combined protective guard for building construction.

Background

With the development and progress of the society and the attention of the country to the labor guarantee, the safety requirement of the building construction process is higher and higher, so more and more auxiliary tools or devices are used in the building construction process. In order to prevent objects from falling from high altitude or approaching a pit during the construction of a building, a guard rail is generally arranged outside the building.

The existing guard rail is mostly of an integral structure, the occupied area is large, the existing guard rail is not convenient to move and transport, meanwhile, the existing guard rail is single in structure, the length and the width of a protection size cannot be flexibly adjusted, and the guard rail is lack of a warning effect. Therefore, a combined guard rail for building construction is proposed to solve the above problems.

Disclosure of Invention

The combined protective fence for building construction is provided in the embodiment to solve the problem that the device in the prior art is inconvenient to move, transport and fix.

According to one aspect of the application, a combined protective guard for building construction is provided, which comprises a warning plate and a fixing mechanism, wherein the periphery of the front side of the warning plate is provided with a reflective strip;

the fixed establishment includes the ramp, the ramp has two, two the fixed connection connecting plate left and right sides respectively of one side that the ramp is close to each other, two one side that the ramp was kept away from each other is the one side that two cavity post outer walls of fixed connection are close to each other respectively, two cavity post inner chamber slides respectively cup joints the support column bottom, two one side top that the support column is close to each other is fixed connection warning board left and right sides respectively, two spacing groove, two are do not inlayed at the slope center punishment of ramp the limiting groove inner chamber slides respectively and cup joints the slide bar bottom, two slide bar top is fixed connection screw sleeve outer wall bottom center department respectively, two one side bottom difference fixed connection bottom plate one side that the cavity post outer wall was kept away from each other.

Furthermore, two bottom plate center department slides respectively and cup joints and runs through fixed spike, connecting plate center department slides and cup joints and runs through fixed spike.

Furthermore, the two threaded sleeves are respectively in threaded sleeve connection with the outer wall of the first threaded rod, one ends, close to each other, of the two first threaded rods are respectively in fixed sleeve connection with the first bevel gear, and one ends, far away from each other, of the two first threaded rods are respectively in rotating connection with one side, close to each other, of the two support columns.

Furthermore, the top ends of the two first bevel gears are respectively meshed with the left side and the right side of the second bevel gear, the second bevel gear is fixedly sleeved at the bottom end of the first rotating disc, the top end of the first rotating disc is rotatably connected with and penetrates through the center of the transverse plate, and the left end and the right end of the transverse plate are respectively fixedly connected with one side of the two supporting columns, which are close to each other.

Furthermore, the centers of the bottom ends of the inner walls of the two cavity columns are respectively fixedly connected with the bottom ends of the springs, the top ends of the two springs are respectively fixedly connected with the bottom ends of the support columns, and the two springs are respectively sleeved in the inner cavity of the cavity column in a sliding manner.

Furthermore, two the cardboard is connected to one side inner chamber that the support column kept away from each other respectively to the joint, two the cardboard is respectively through fixing bolt fixed connection support column.

Furthermore, the center of one side, away from each other, of each of the two clamping plates is fixedly connected with one end of the outer wall of the cavity shaft, the inner cavity of the cavity shaft is in threaded sleeve connection with one end of a second threaded rod, the other ends of the second threaded rods are fixedly connected with one end of a second turntable respectively, and the other ends of the second turntables are rotatably connected with and penetrate through the center of the extension plate respectively.

Furthermore, the centers of the bottom ends of the two extension plates are respectively fixedly connected with pulleys.

Furthermore, two one side top that the extension plate is close to the cardboard rotates respectively and connects second upper rotating rod one end, two the one end that the extension plate was kept away from to the second upper rotating rod rotates respectively and connects connecting block one end, two the connecting block other end rotates respectively and connects first upper rotating rod one end, two the first upper rotating rod other end rotates respectively and connects cardboard one side top.

Furthermore, the lower part of one side of the extension plate close to the clamping plate is respectively and rotatably connected with one end of a second lower rotating rod, one end of the second lower rotating rod far away from the extension plate is respectively and rotatably connected with one end of a connecting block, the other end of the connecting block is respectively and rotatably connected with one end of a first lower rotating rod, and the other end of the first lower rotating rod is respectively and rotatably connected with the lower part of one side of the clamping plate.

Through the above-mentioned embodiment of this application, adopted fixed establishment, solved the inconvenient transportation of removing of device and fixed problem, increased fixed effect.

Drawings

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

FIG. 1 is a schematic overall perspective view of an embodiment of the present application;

FIG. 2 is a schematic diagram of the overall internal structure of an embodiment of the present application;

fig. 3 is a schematic diagram of a partial enlarged structure at a in fig. 2 according to an embodiment of the present application.

In the figure: 1. warning board, 2, reflection of light strip, 3, fixing bolt, 4, cardboard, 5, first upper rotating rod, 6, extension plate, 7, first threaded rod, 8, cavity post, 9, spacing groove, 10, slide bar, 11, fixed spike, 12, connecting plate, 13, ramp, 14, spring, 15, first lower rotating rod, 16, bottom plate, 17, second lower rotating rod, 18, pulley, 19, second upper rotating rod, 20, connecting block, 21, support column, 22, diaphragm, 23, threaded sleeve, 24, first bevel gear, 25, second bevel gear, 26, first carousel, 27, second threaded rod, 28, second carousel, 29, cavity axle.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The fixing mechanism in this embodiment may be applied to various guard rails, for example, the following guard rail is provided in this embodiment, and the fixing mechanism in this embodiment may be used to fix the following guard rail.

The guard rail comprises a frame, a vertical supporting rod, a first transverse supporting rod, a second transverse supporting rod, a connecting piece, a hinge and a base, wherein the periphery of the frame is subjected to arc treatment, so that the guard rail is convenient to prevent collision; the middle position of the frame is vertically and fixedly provided with a vertical supporting rod, the upper end and the lower end inside the frame are both transversely provided with a first transverse supporting rod, the first transverse supporting rods are sequentially arranged into two groups, the two first transverse supporting rods are arranged into one group, the middle of the first transverse supporting rod between the two adjacent groups is provided with a second transverse supporting rod, the second transverse supporting rods are sequentially arranged into three groups, the three second transverse supporting rods are arranged into one group, the first transverse supporting rods are at least arranged into three groups, the second transverse supporting rods are at least arranged into two groups, the vertical supporting rods are arranged at the front end and the rear end of the first transverse supporting rod and the second transverse supporting rod, the outer diameters of the vertical supporting rod, the first transverse supporting rod and the second transverse supporting rod are sequentially reduced, and further when external impact force is received, the vertical supporting rod, the first transverse supporting rod and the second transverse supporting rod are sequentially stressed, the buffer is convenient for buffering the external impact force, and the stability of the utility model is further improved; the adjacent frames are connected through the connecting pieces, the connecting pieces are arranged between the two first transverse supporting rods in one group, the height of each connecting piece is slightly smaller than the distance between the two first transverse supporting rods, the connecting stability of the utility model is convenient to improve, the installation is convenient, the connecting pieces are provided with positioning holes matched with the adjacent frames, the adjacent protective guards are convenient to fold and store through the connecting pieces, and the space is saved; the bases are arranged at the bottom of the frame, and the adjacent bases are hinged through the hinges, so that the connection tightness between the adjacent bases is reinforced, and the stowability of the foldable frame is further improved; the two ends of the base are provided with the support legs, the front ends of the support legs are provided with the mounting seats, the mounting seats are provided with mounting holes, expansion bolts are arranged in the mounting holes, and therefore the guard rails can be conveniently and stably fixed through the expansion bolts, and the mounting mode of the expansion bolts is simple; the lower end of the support leg is provided with the moving device which is arranged as a roller, the roller is arranged as a universal wheel, and the universal wheel is provided with a stop structure, so that the stop is convenient, and the use flexibility of the utility model is further improved.

Of course, the present embodiment can also be used to fix guard rails with other structures. The following description is not repeated herein, and the filtering mechanism according to the embodiment of the present application is described below.

Referring to fig. 1-3, a combined guard rail for building construction includes a warning plate 1 and a fixing mechanism, wherein a reflective strip 2 is disposed around the front side of the warning plate 1;

fixed establishment includes ramp 13, ramp 13 has two, two fixed connection connecting plate 12 left and right sides respectively of one side that ramp 13 is close to each other, two one side that ramp 13 was kept away from each other is one side that two cavity post 8 outer walls of fixed connection are close to each other, two the 8 inner chambers of cavity post slide respectively and cup joint support column 21 bottom, two one side top that support column 21 is close to each other is fixed connection warning board 1 left and right sides respectively, two spacing groove 9, two are inlayed respectively to ramp 13's slope center punishment spacing groove 9 inner chamber slides respectively and cup joints slide bar 10 bottom, two slide bar 10 top is fixed connection threaded sleeve 23 outer wall bottom center department respectively, two one side bottom difference fixed connection bottom plate 16 one side that 8 outer walls of cavity post kept away from each other.

The centers of the two bottom plates 16 are respectively sleeved and penetrated through the fixed spikes 11 in a sliding manner, the center of the connecting plate 12 is sleeved and penetrated through the fixed spikes 11 in a sliding manner, the fixing effect of the device is improved, the two threaded sleeves 23 are respectively sleeved on the outer wall of the first threaded rod 7 in a threaded manner, the ends, close to each other, of the two first threaded rods 7 are respectively and fixedly sleeved with a first bevel gear 24, the ends, far away from each other, of the two first threaded rods 7 are respectively and rotatably connected with the sides, close to each other, of the two supporting columns 21, the first bevel gear 24 rotates to drive the threaded sleeves 23 to move horizontally, the top ends of the two first bevel gears 24 are respectively engaged and matched with the left side and the right side of a second bevel gear 25, the second bevel gear 25 is fixedly sleeved at the bottom end of a first rotating disc 26, the top end of the first rotating disc 26 is rotatably connected and penetrates through the center of the transverse plate 22, and the left end and the right end of the transverse plate 22 are respectively and fixedly connected with the sides, close to each of the two supporting columns 21, the first bevel gear 24 is driven to rotate by rotating the first rotating disc 26, the bottom ends of the springs 14 are respectively and fixedly connected at the centers of the bottom ends of the inner walls of the two cavity columns 8, the top ends of the two springs 14 are respectively and fixedly connected with the bottom ends of the support columns 21, the two springs 14 are respectively and slidably sleeved in the inner cavities of the cavity columns 8, so that the stability of the lifting process of the support columns 21 is improved, the inner cavities at one sides, away from each other, of the two support columns 21 are respectively and fixedly connected with the support columns 21, the two clamp plates 4 are respectively and fixedly connected with the support columns 21 through the fixing bolts 3, so that the clamping plates 4 are convenient to disassemble, the centers at the sides, away from each other, of the two clamp plates 4 are respectively and fixedly connected with one end of the outer wall of the cavity shaft 29, the inner cavities of the two cavity shafts 29 are respectively and threadedly sleeved with one ends of the second threaded rods 27, the other ends of the two second threaded rods 27 are respectively and fixedly connected with one end of the second rotating disc 28, and penetrate through the center of the extension plate 6, the positions of the extension plates 6 are adjusted by rotating the second rotary table 28, the centers of the bottom ends of the two extension plates 6 are respectively and fixedly connected with the pulleys 18, so that the moving and the transportation of the device are facilitated, the upper parts of one sides, close to the clamping plate 4, of the two extension plates 6 are respectively and rotatably connected with one end of a second upper rotating rod 19, one ends, far away from the extension plates 6, of the two second upper rotating rods 19 are respectively and rotatably connected with one end of a connecting block 20, the other ends of the two connecting blocks 20 are respectively and rotatably connected with one end of a first upper rotating rod 5, the other ends of the two first upper rotating rods 5 are respectively and rotatably connected with the upper parts of one sides of the clamping plate 4, the lower parts, close to the clamping plate 4, of the two extension plates 6 are respectively and rotatably connected with one end of a second lower rotating rod 17, one ends, far away from the extension plates 6, of the two second lower rotating rods 17 are respectively and rotatably connected with one end of the connecting block 20, the other ends of the two connecting blocks 20 are respectively and rotatably connected with one end of a first lower rotating rod 15, the other end of the first lower rotating rod 15 is respectively and rotatably connected to the lower portion of one side of the clamping plate 4, so that the two extension plates 6 can be folded and unfolded conveniently.

When the utility model is used, electrical components appearing in the application are externally connected with a power supply and a control switch, the device is pushed to move to a designated construction position through the pulley 18, after the electrical components reach a designated construction position, the first rotary disc 26 is rotated, the first rotary disc 26 drives the second bevel gear 25 to rotate, the two first bevel gears 24 meshed and matched with the second bevel gear 25 rotate along with the first bevel gears, the two first bevel gears 24 respectively drive the first threaded rod 7 to rotate, the two threaded sleeves 23 in threaded matching with the first threaded rod 7 respectively horizontally move in the direction away from each other under the limitation of the limiting groove 9, so that the two sliding rods 10 respectively slide in the inner cavity of the limiting groove 9, thereby pushing the two slope plates 13 to move downwards, simultaneously, the two cavity columns 8 slide downwards, so that the connecting plate 12 and the bottom plate 16 respectively contact the ground, and the pulley 18 is separated from the ground, thereby realizing the fixation of the device, fixing the device on the ground through the fixing long nails 11, increasing the fixing effect of the device, continuing to rotate the first rotary disc 26 in the same direction, making the slide bar 10 move horizontally in the same direction, making the two support columns 21 slide upwards along the inner cavities of the cavity columns 8 respectively, making the two support columns 21 drive the warning board 1 to move upwards, realizing the adjustment of the height of the warning board 1, then arranging the reflective strips 2 around the warning board 1, being convenient for being applicable to different construction environments, matching the reflective strips 2, playing a role of warning, increasing the protection effect, rotating the two second rotary discs 28, driving the second threaded rod 27 to rotate through the second rotary discs 28, matching the second threaded rod 27 with the inner cavity of the cavity shaft 29 through the threads, making the second threaded rod 27 move in the direction away from the clamping board 4, driving the extension board 6 to move along with the second threaded rod 27, simultaneously matching the two first upper rotary rods 5 and the second upper rotary rod 19 to rotate, two bull sticks and second 17 cooperation rotations under, realize two extension plates 6 respectively and warn the interval between the board 1 and adjust to can cooperate different construction environment to increase the protection width, simultaneously through fixing bolt 3 with cardboard 4 and backup pad fixed connection, can make things convenient for the dismantlement of cardboard 4, thereby the maintenance of the part of being convenient for.

The application has the advantages that:

1. the device is simple to operate, the first rotary disc is rotated to drive the second bevel gear to rotate, the two first bevel gears meshed and matched with the second bevel gear rotate along with the first bevel gears, the two first bevel gears drive the first threaded rods to rotate respectively, the two threaded sleeves in threaded fit with the first threaded rods horizontally move towards directions away from each other under the limit of the limit grooves respectively, the two sliding rods slide in the inner cavities of the limit grooves respectively, so that the two slope plates are pushed to move downwards, meanwhile, the two cavity columns slide downwards, the connecting plate and the bottom plate are in contact with the ground respectively, the pulley is separated from the ground at the moment, the device is fixed, and the device is fixed on the ground through the fixing long nails, so that the fixing effect of the device is improved;

2. the structure is reasonable, after the fixing long nails and the ground are fixed, the first rotating disc continues to rotate in the same direction, the sliding rods move horizontally in the same away mode, so that the two supporting columns slide upwards along the cavity column inner cavity respectively, the two supporting columns can drive the warning board to move upwards, the height of the warning board is adjusted, the warning board is convenient to adapt to different construction environments by arranging the light reflecting strips around the warning board, the warning effect is achieved by matching the light reflecting strips, and the protection effect is improved;

3. this application is through rotating two second carousels, the second carousel drives the second threaded rod and rotates, second threaded rod and cavity axle inner chamber screw-thread fit, thereby make the second threaded rod to the direction removal of keeping away from the cardboard, the second threaded rod drives the extension plate and removes thereupon, two first bull stick and second bull stick cooperations rotate simultaneously, two bull sticks and second bull stick cooperations rotate, realize two extension plates respectively and the interval between the warning board is adjusted, thereby can cooperate different construction environment to increase the protection width, and be convenient for fold and accomodate, reduce area, pass through fixing bolt with cardboard and backup pad fixed connection simultaneously, can make things convenient for the dismantlement of cardboard, thereby the maintenance of the part of being convenient for.

It is well within the skill of those in the art to implement, without undue experimentation, the present application is not directed to software and process improvements, as they relate to circuits and electronic components and modules.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a combined type rail guard for construction which characterized in that: the warning device comprises a warning plate (1) and a fixing mechanism, wherein the periphery of the front side of the warning plate (1) is provided with a reflecting strip (2);

fixed establishment includes ramp (13), ramp (13) have two, two fixed connection connecting plate (12) left and right sides respectively of one side that ramp (13) are close to each other, two one side that ramp (13) are kept away from each other is two one sides that two cavity post (8) outer walls of fixed connection are close to each other, two cavity post (8) inner chamber slides respectively and cup joints support column (21) bottom, two one side top that support column (21) are close to each other is fixed connection warning board (1) left and right sides respectively, two spacing groove (9), two have been inlayed respectively to slope center department of ramp (13) spacing groove (9) inner chamber slides respectively and cup joints slide bar (10) bottom, two slide bar (10) top fixed connection threaded sleeve (23) outer wall bottom center department respectively, two one side bottom difference fixed connection bottom plate (16) one side that cavity post (8) outer wall was kept away from each other.

2. The combined guard rail for building construction according to claim 1, wherein: two bottom plate (16) center department slides respectively and cup joints and runs through fixed spike (11), connecting plate (12) center department slides and cup joints and runs through fixed spike (11).

3. The combined guard rail for building construction according to claim 1, wherein: the two threaded sleeves (23) are respectively in threaded sleeve connection with the outer wall of the first threaded rod (7), one ends, close to each other, of the first threaded rods (7) are respectively in fixed sleeve connection with the first bevel gears (24), and one ends, far away from each other, of the first threaded rods (7) are respectively connected with one sides, close to each other, of the two support columns (21) in a rotating mode.

4. The combined guard rail for building construction according to claim 3, wherein: two first bevel gear (24) top meshing cooperation second bevel gear (25) left and right sides respectively, second bevel gear (25) fixed cup joint is in first carousel (26) bottom, first carousel (26) top is rotated and is connected and run through diaphragm (22) center department, both ends are fixed connection one side that two support columns (21) are close to each other respectively about diaphragm (22).

5. The combined guard rail for building construction according to claim 1, wherein: the centers of the bottom ends of the inner walls of the two cavity columns (8) are respectively fixedly connected with the bottom ends of springs (14), the top ends of the two springs (14) are respectively fixedly connected with the bottom ends of supporting columns (21), and the two springs (14) are respectively sleeved in the inner cavity of the cavity column (8) in a sliding mode.

6. The combined guard rail for building construction according to claim 1, wherein: two the cardboard (4) are blocked joint respectively to the one side inner chamber that support column (21) kept away from each other, two cardboard (4) are respectively through fixing bolt (3) fixed connection support column (21).

7. The combined guard rail for building construction according to claim 6, wherein: two cardboard (4) one side center department of keeping away from each other is fixed connection cavity axle (29) outer wall one end respectively, two cavity axle (29) inner chamber is threaded socket second threaded rod (27) one end respectively, two the second threaded rod (27) other end is fixed connection second carousel (28) one end respectively, two the second carousel (28) other end rotates respectively to be connected and runs through extension plate (6) center department.

8. The combined guard rail for building construction according to claim 7, wherein: the centers of the bottom ends of the two extension plates (6) are respectively fixedly connected with pulleys (18).

9. The combined guard rail for building construction according to claim 7, wherein: two one side top that extension plate (6) are close to cardboard (4) rotates respectively and connects commentaries on classics pole (19) one end on the second, two the one end that extension plate (6) were kept away from in commentaries on classics pole (19) on the second rotates respectively and connects connecting block (20) one end, two the connecting block (20) other end rotates respectively and connects first commentaries on classics pole (5) one end, two the first commentaries on classics pole (5) other end rotates respectively and connects cardboard (4) one side top.

10. The combined guard rail for building construction according to claim 7, wherein: two one side below that extension plate (6) are close to cardboard (4) rotates respectively and connects second down bull stick (17) one end, two the one end that extension plate (6) were kept away from under second bull stick (17) rotates respectively and connects connecting block (20) one end, two the other end of connecting block (20) rotates respectively and connects first down bull stick (15) one end, two the other end of first down bull stick (15) rotates respectively and connects cardboard (4) one side below.