CN115875578A - Central authorities' fill screen shock attenuation platform - Google Patents
Central authorities' fill screen shock attenuation platform Download PDFInfo
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- CN115875578A CN115875578A CN202211655715.1A CN202211655715A CN115875578A CN 115875578 A CN115875578 A CN 115875578A CN 202211655715 A CN202211655715 A CN 202211655715A CN 115875578 A CN115875578 A CN 115875578A
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Abstract
The invention relates to a damping platform for a central hopper screen, and belongs to the technical field of large-span spatial vibration control. A bucket screen is hung at the bottom of the damping platform, and the damping platform comprises an external channel steel annular support and an internal central platform; the central platform consists of a groined platform and a central platform annular channel steel surrounding the groined platform, and the groined platform consists of four I-shaped steel bars arranged in a groined shape; the channel steel annular support is used for connecting the central platform and the roof structure and provides a supporting force for the central platform at any angle in the horizontal and vertical directions; a buffer layer is filled between the outer surface of the annular channel steel of the central platform and the inner surface of the annular channel steel support; the central platform is connected with the bucket screen at the lower part through a sling and is used for transmitting the load and vibration in all directions transmitted by the bucket screen. The flexible buffer layer effectively realizes shock insulation and energy consumption.
Description
Technical Field
The invention relates to a damping platform for a central hopper screen, and belongs to the technical field of large-span spatial vibration control.
Background
The scoop screen is a large display device flexibly suspended in the center of the roof structure of a gymnasium, and is called as a 'scoop screen' because of being shaped like a funnel. In recent years, with the development of activities such as sporting events and entertainment shows, the number of applications of the scoop screen has rapidly increased. In order to pursue a better display effect, the weight of the bucket screen is increased along with the increase of the display area and the miniaturization of the pixel pitch, and a larger centralized suspension mass is formed in the center of the roof.
When the structure encounters a strong earthquake, the transverse earthquake wave input structure can enable the structure to horizontally shake, and because the suspension cable is flexible, relative speed and acceleration are generated between the suspended large-mass bucket screen and the roof structure. The input of seismic wave energy can turn into the kinetic energy of hanging the fill screen into, makes then fill screen swing by a wide margin, and instantaneous centripetal force and seismic wave arouse the vertical acceleration of structure and aggravated vertical shock effect again, can cause the structural part member internal force of room lid to sharply increase, and is very unfavorable to the bearing capacity and the overall stability of room lid structure.
If a bucket screen shock insulation platform is arranged on the roof structure, a hard connection mode adopted by the roof and the bucket screen in the past is changed into shock insulation platform connection, so that the purposes of reducing the swing amplitude of the bucket screen under the action of an earthquake, consuming the energy input to a node by earthquake waves in a short time, reducing the peak value of internal force increase of a roof rod piece and ensuring the safety of the roof structure, a roof structural member and the bucket screen are achieved. The traditional shock insulation platform changes rigid connection between a supported member and a support into elastic connection, weakens energy transmission of vibration, and achieves the purposes of energy dissipation and shock absorption. The existing anti-seismic platform usually consumes the input seismic wave energy simply through a tuned mass damper, a viscous damping system and other damping systems, so that the aims of energy consumption and shock absorption are fulfilled. However, because the bucket screen is suspended in the air through a suspension cable, the directions of energy and impact load generated by the swinging of the bucket screen are difficult to determine, and the size and the direction of the bucket screen are changed rapidly, the existing vibration-isolating platform is more obvious in seismic energy reduction in the horizontal direction, but the attenuation effect on horizontal torsional vibration and vertical impact vibration of the bearing mass is relatively not obvious. Although the existing anti-seismic platform is elastically connected with the lower bearing structure, because the support has more constraint and the rigidity of the coupling system of the structure, the platform and the whole borne mass is higher, although the input seismic wave energy is consumed, the swing amplitude of the suspension bucket screen cannot be reduced due to the common motion of the large-rigidity coupling system, and the system has the risk of node falling and even cable breaking. Too much damper setting has still brought more problems, and not only the expense is expensive, and the installation is loaded down with trivial details and viscous damper often appears the condition such as weeping, causes adverse effect to the follow-up maintenance of structure.
Sunding, he Haoxiang, lan cao ji, li Shaosong of Beijing university of industry proposes a construction steel platform system (202110999636.1) adopting TMD and TLD composite tuning shock absorption, and the platform adopts TMD and TLD damping systems to compositely support an upper steel platform, so that a better composite tuning shock absorption effect of the whole steel platform is realized. However, the lower support dead weight and the volume of the platform are large, only the mass of the upper part of the support platform can be borne, equipment and suspension machinery cannot be placed on the lower part, and the lower support dead weight and the volume cannot be used as a damping platform of the bucket screen.
A three-dimensional shock isolation platform (2020201714552.5) with horizontal and vertical adaptive stiffness characteristics is provided by Zhou Ying, chen Peng and Liu Hao of Tongji university, shock isolation is performed by adopting a mode of combining rubber supports and prepressing spring sets, the platform has good vertical bearing capacity, small-amplitude horizontal and vertical displacement of the platform is allowed, and a good shock isolation effect is achieved. However, when the platform is subjected to vibration or impact load on a large horizontal plane, the lower support can bear large shear stress, and the system cannot allow the circular platform to rotate within a certain range and cannot be used as a damping platform of the bucket screen.
Li Hongnan, he Xiaoyu, holsheng, guo Daocheng and Tian Jing of university of continental care invented a viscoelastic multidimensional vibration damper (200810228847. X) which adopts the cross arrangement of upper and lower layers of connecting steel plates, the two steel plates are bonded by vulcanized viscoelastic materials, so that the material layer can be horizontally translated and torsionally deformed to a certain degree. However, the shock absorber is rigidly connected with the beam member through the bolt, so that the shock absorber cannot move in the vertical direction, and the horizontal translation on the horizontal plane is along the directions of the two fixed steel plates, so that the shock absorber is not suitable for bearing displacement and impact load which change rapidly at multiple angles. And the shock absorber is suitable for ocean platforms and high-rise buildings, and is not suitable for large-span space structures, particularly for the condition of locally bearing large-mass suspension bucket screens.
Luo Yi mechanical manufacturing (Suzhou) Limited incorporated provides a platform anti-seismic anti-shaking and damping device (201910654583.2) based on a TDL system, antifreezing damping liquid is filled in the system, and when vibration occurs, the liquid in the barrel can generate acting force opposite to the shaking direction of the outside on the inner wall of the barrel, so that the shaking amplitude of the whole external structure is weakened. However, this system has some problems such as large weight and volume, high height, and unsuitability for installation between the upper chord and the lower chord in a truss system. Meanwhile, the internal damping fluid also brings the problems of regular inspection and possible leakage.
The research institute of Harbin university of Industrial university Liu Jie, liu Gongjun, liu Hongbo, li Anhui, guo Yankun, cheng Jiang, zhang Chong, lin Kun, liu Peng, jiang Xiandi provides a multi-axis seismic isolation bearing system (201410791484.6). The system is provided with three layers of base plates, and a plurality of shock insulation shafts are arranged in the middle of the base plates to provide vertical support and shock insulation effects. Meanwhile, the damper is arranged on the horizontal plane, so that the structure is allowed to be horizontal, vertical displacement and rotation within a certain range simultaneously. However, the number of the components of the system is large, the connection is not tight enough, the construction difficulty is increased to a certain extent, and the service life of the system is also influenced. In particular, the pedestal system employs a still conventional approach of supporting the upper portion of the substructure, with limited space below, and is not suitable for suspending large mass panels in large span space truss structures.
The existing damping platform is mostly applied to ships, vehicles, precision mechanical instruments, high-rise buildings and the like, and the damping platform applied to a building structure mostly depends on various dampers, and the energy of seismic waves is reduced by vertically arranging the dampers, or the amplitude of the shaking of the structure is reduced by instantaneously generating an acting force opposite to the seismic acceleration. The existing damping platforms are supported and fixed on the structure through the lower parts, and have a plurality of problems when being applied to suspending a large-mass hopper screen:
1. the support depending on the lower part of the platform often leads the horizontal acceleration to bring larger shearing stress to the support structure, which is unfavorable for the stress of the structure, and the support mode often is difficult to restrain larger displacement in the horizontal direction and bear complex reciprocating and direction-variable transverse load.
2. The lower supporting mode enables the support to be still in hard connection with the damping platform, horizontal shaking of the roof can drive the suspended bucket screen to swing greatly, and meanwhile, the bucket screen can rotate. The effect of energy dissipation and shock absorption in the horizontal direction is not ideal.
3. The existing damping platform is usually restrained by a plurality of bearing components, the degree of freedom of the system is relatively small, and the damping platform is applied to suspension of a large-mass bucket screen, so that the bucket screen cannot resist swinging and rotating.
4. The dependence of the lower support structure on the damper makes the damping platform generally available only for supporting the upper mass, there is insufficient space below the platform and insufficient space for arranging the sling lifting points and associated machinery such as winches. Dampers represented by TLD also have problems of excessive weight and volume, leakage, maintenance, and the like.
5. The existing damping platform cannot effectively weaken the acceleration of any angle between the vertical direction and the horizontal plane at the same time, and cannot allow the bearing part to displace in all directions and angles within a certain range at the same time.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a central hopper screen damping platform which is used for realizing the omnibearing damping of a hopper screen.
In order to solve the problems, the invention adopts the following technical scheme:
a bucket screen is hung at the bottom of a damping platform, and the damping platform comprises an external channel steel annular support and an internal central platform; the central platform consists of a # -shaped platform and a central platform annular channel steel surrounding the # -shaped platform, and the # -shaped platform consists of four I-shaped steel beams arranged in a # -shape; the channel steel annular support is used for connecting the central platform and the roof structure, and provides a supporting force for the central platform at any angle in the horizontal and vertical directions; the central platform is connected with the bucket screen at the lower part through a sling and is used for transmitting loads and vibrations in various directions transmitted by the bucket screen;
the annular channel steel of the central platform extends into and is arranged at the inner side of the annular channel steel support, and a buffer layer is filled between the outer surface of the annular channel steel of the central platform and the inner surface of the annular channel steel support; the buffer layer is directly bonded with the inner side surface of the annular channel steel support and the outer surface of the annular channel steel of the central platform, so that shock insulation, energy consumption and shock absorption are realized, and soft contact between components during vibration is realized;
and the central platform is provided with mechanical equipment matched with the bucket screen, and the mechanical equipment comprises a winch connected with a sling, a sling lifting point and power line equipment.
Further, the buffer layer is composed of a flexible material.
Further, the buffer layer is a metal rubber cushion layer or a laminated rubber cushion layer.
Furthermore, the metal rubber pad is composed of a rubber pad and a spring embedded in the rubber pad.
Furthermore, the metal rubber pad is composed of a rubber pad and a disc spring embedded in the rubber pad.
Further, the laminated rubber cushion layer is formed by laminating a plurality of rubber cushions.
Furthermore, the groined type platform also comprises two diagonal I-shaped steel which are arranged diagonally.
When the hanging bucket is used in daily life, the central platform bears the load of the hanging bucket screen and the matched instruments. The annular support of channel-section steel provides ascending holding power to central platform through the lower surface contact, transmits the load to the roof truss structure then. When an earthquake occurs, the roof truss structure drives the annular support to vibrate, the central platform and the bucket screen enable the shaking amplitude to be relatively small by means of inertia, and relative displacement is generated between the central platform and the bucket screen. When the relative displacement is generated, a supporting force opposite to the shaking direction is generated in the side wall of the annular support or the upper baffle plate to restrain the central platform. The flexible material that sets up in the buffer layer takes place shock insulation shock attenuation's effect at the in-process that relative displacement takes place, consumes the seismic wave energy that transmits platform and fill the screen simultaneously.
The invention has the beneficial effects that:
1. the support of the platform adopts annular channel steel, the central platform is fixed in the groove, and the support at any angle in the horizontal and vertical directions can be provided. Meanwhile, the suspension bucket screen does not depend on the support below the platform, and sufficient space is reserved.
2. A buffer layer is arranged between the bearing part and the supporting part of the platform and directly adhered to the inner side surface of the support, so that shock insulation, energy dissipation and shock absorption are realized, and soft contact between components during vibration is realized. The buffer layer can be made of a rubber pad, a metal rubber pad, a disc spring and other relatively flexible materials.
3. The flexible buffer layer ensures that the central platform can horizontally and vertically displace within a certain range, the swing amplitude of the hopper screen is fully reduced, and the purposes of shock insulation and energy consumption are achieved.
Drawings
FIG. 1 is a schematic view of the whole connection between a damping platform of a central hopper screen and a lower hopper screen;
FIG. 2 is a bottom view of the shock absorbing platform of the center screen of the present invention;
FIG. 3 is a side view of the shock absorbing platform of the center screen of the present invention;
FIG. 4 isbase:Sub>A schematic sectional view taken along line A-A of embodiment 1 of FIG. 2;
FIG. 5 is a schematic sectional view taken along line B-B of example 1 in FIG. 2;
FIG. 6 isbase:Sub>A schematic sectional view taken along line A-A of example 2 in FIG. 2;
FIG. 7 is a schematic sectional view taken along line B-B of example 2 in FIG. 2;
FIG. 8 isbase:Sub>A schematic sectional view taken along line A-A of example 3 in FIG. 2;
FIG. 9 is a schematic sectional view taken along line B-B of example 3 in FIG. 2;
FIG. 10 is a perspective view of the shock absorbing platform of the central panel and the lower panel of the present invention.
Detailed Description
The invention will be further described in detail with reference to the drawings and the detailed description, which are not intended to limit the invention.
Example 1
As shown in fig. 1-3,4-5 and 10, the bottom of the damping platform is hung with a bucket screen 3, and the damping platform comprises an external channel steel annular support 1 and an internal central platform 2. The central platform 2 is composed of a groined platform and a central platform annular channel steel 24 surrounding the groined platform, the groined platform is composed of four I-shaped steels 21 arranged in a groined shape, and the central platform further comprises two oblique I-shaped steels 22 arranged diagonally. The annular channel steel support 1 is used for connecting the central platform 2 and a roof structure, and the annular channel steel support 1 provides supporting force for the central platform 2 at any angle in the horizontal and vertical directions.
The central platform annular channel steel 24 extends into and is arranged on the inner side of the channel steel annular support 1, and the buffer layer 4 is filled between the outer surface of the central platform annular channel steel 24 and the inner surface of the channel steel annular support 1. The buffer layer 4 is directly bonded with the inner side surface of the channel steel annular support 1 and the outer surface of the annular channel steel 24 of the central platform, so that shock insulation, energy dissipation and shock absorption are realized, and soft contact between components during vibration is realized. As shown in fig. 4-5, the cushion layer 4 is a metal rubber cushion layer, and is composed of a rubber pad 41 and a spring 42 embedded therein.
As shown in fig. 3, the central platform 2 is provided with a bucket panel supporting mechanism 7, which includes a hoist 71 connected to the suspension cable 6, a suspension cable lifting point 72, and an electric power line device. The central platform 2 is connected with the lower bucket screen 3 through a sling 6 and is used for transmitting loads and vibration in all directions transmitted by the bucket screen 3.
When in use, the central platform 2 bears the load of the suspended bucket screen 3 and the bucket screen matching mechanical equipment 7. The annular support 1 of channel-section steel provides ascending holding power to central platform 2 through the lower surface contact, then transmits the load to the roof truss structure. When the earthquake takes place, the roof truss structure drives channel-section steel annular support 1 and takes place the vibration, and central platform 2 and fill screen 3 then rely on inertia to make the range of rocking less relatively, produce relative displacement between the two. When the relative displacement is generated, a supporting force opposite to the shaking direction is generated in the side wall or the upper baffle of the channel steel annular support 1 to restrain the central platform 2. Flexible material provided in the buffer layer 4: the rubber pad 41 and the spring 42 embedded therein have the functions of shock insulation and shock absorption in the relative displacement process, and simultaneously consume the seismic wave energy transmitted to the central platform 2 and the hopper screen 3.
Example 2
As shown in fig. 1-3,6-7, 10, in another shock absorbing platform for a central hopper screen according to the present invention, the buffer layer 4 is a metal rubber pad layer, and the metal rubber pad layer is composed of a rubber pad 41 and a disc spring 43 embedded therein. Other structures and connection methods are the same as those of embodiment 1, and are not described in detail here.
Example 3
As shown in fig. 1-3,8-10, in another shock absorbing platform for a central hopper screen, the buffer layer 4 is a laminated rubber cushion layer formed by laminating a plurality of rubber pads 41. Other structures and connection modes are the same as those of embodiment 1, and are not described in detail here.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (7)
1. The utility model provides a central authorities fill screen shock attenuation platform, shock attenuation platform bottom is hung and is equipped with fill screen (3), its characterized in that: the damping platform comprises an external channel steel annular support (1) and an internal central platform (2); the central platform (2) is composed of a groined platform and a central platform annular channel steel (24) surrounding the groined platform, and the groined platform is composed of four I-shaped steel (21) arranged in a groined shape; the channel steel annular support (1) is used for connecting the central platform (2) and a roof structure, and the channel steel annular support (1) provides a supporting force for the central platform (2) at any angle in the horizontal and vertical directions; the central platform (2) is connected with the bucket screen (3) at the lower part through a sling (6) and is used for transmitting load and vibration in all directions transmitted by the bucket screen (3);
the central platform annular channel steel (24) extends into and is arranged on the inner side of the channel steel annular support (1), and a buffer layer (4) is filled between the outer surface of the central platform annular channel steel (24) and the inner surface of the channel steel annular support (1); the buffer layer (4) is directly bonded with the inner side surface of the channel steel annular support (1) and the outer surface of the annular channel steel (24) of the central platform, so that shock insulation, energy consumption and shock absorption are realized, and soft contact between components is realized during shock;
and the central platform (2) is provided with a bucket screen matching mechanical device (7) which comprises a winch (71) connected with a sling (6), a sling lifting point (72) and power line equipment.
2. The central hopper screen shock absorption platform according to claim 1, wherein: the buffer layer (4) is made of flexible material.
3. The center screen shock absorption platform of claim 2, wherein: the buffer layer (4) is a metal rubber cushion layer or a laminated rubber cushion layer.
4. The center screen shock absorption platform of claim 3, wherein: the metal rubber pad is composed of a rubber pad (41) and a spring (42) embedded in the rubber pad.
5. A central hopper screen shock absorbing platform according to claim 3, wherein: the metal rubber pad is composed of a rubber pad (41) and a disc spring (43) embedded in the rubber pad.
6. A central hopper screen shock absorbing platform according to claim 3, wherein: the laminated rubber cushion layer is formed by laminating a plurality of rubber cushions (41).
7. The central hopper screen shock absorption platform according to claim 1, wherein: the groined platform also comprises two diagonal I-shaped steels (22) which are arranged diagonally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211655715.1A CN115875578A (en) | 2022-12-22 | 2022-12-22 | Central authorities' fill screen shock attenuation platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211655715.1A CN115875578A (en) | 2022-12-22 | 2022-12-22 | Central authorities' fill screen shock attenuation platform |
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| Publication Number | Publication Date |
|---|---|
| CN115875578A true CN115875578A (en) | 2023-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211655715.1A Pending CN115875578A (en) | 2022-12-22 | 2022-12-22 | Central authorities' fill screen shock attenuation platform |
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| Country | Link |
|---|---|
| CN (1) | CN115875578A (en) |
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- 2022-12-22 CN CN202211655715.1A patent/CN115875578A/en active Pending
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