阅读说明：本技术 复合隔振基座 (Composite vibration isolation base ) 是由 林洁 林嘉祥 杨锦勇 于 2018-09-01 设计创作，主要内容包括：本发明公开一种复合隔振基座,使用二次隔振结构技术,包括一次隔振结构的上钢板框槽、上减振器,二次隔振结构的下钢板框槽、下隔振器,上钢板框槽嵌在下钢板框槽中,上减振器可靠安装在上钢板框槽、下钢板框槽底板之间,下隔振器在下钢板框槽四周与地坪之间。上钢板框槽内设置螺纹钢焊接安装设备的地脚螺栓浇筑混凝土后形成上刚性质量块,下钢板框槽体形为整体底板,四周为周边形钢板框槽,周边形钢板框槽内设置螺纹钢浇筑混凝土后形成下刚性质量块。降低二次隔振结构高度,控制共振及设备位移,有效地降低设备结构振动固体传递。(The invention discloses a composite vibration isolation base which uses a secondary vibration isolation structure technology and comprises an upper steel plate frame groove and an upper vibration isolator of a primary vibration isolation structure, a lower steel plate frame groove and a lower vibration isolator of the secondary vibration isolation structure, wherein the upper steel plate frame groove is embedded in the lower steel plate frame groove, the upper vibration isolator is reliably arranged between the upper steel plate frame groove and a bottom plate of the lower steel plate frame groove, and the lower vibration isolator is arranged between the periphery of the lower steel plate frame groove and a terrace. An upper rigid mass block is formed after foundation bolts of the equipment for welding and installing the deformed steel bars in the upper steel plate frame groove are poured with concrete, a lower steel plate frame groove is formed into an integral bottom plate, all-around steel plate frame grooves are formed, and deformed steel bars are arranged in the all-around steel plate frame grooves and formed into a lower rigid mass block after the concrete is poured with the deformed steel bars. The height of the secondary vibration isolation structure is reduced, resonance and equipment displacement are controlled, and vibration solid transmission of the equipment structure is effectively reduced.)

1. The utility model provides an use compound vibration isolation base of secondary vibration isolation structure technique, includes the last steel sheet frame groove of a vibration isolation structure, goes up the shock absorber, the lower steel sheet frame groove of secondary vibration isolation structure, lower isolator, characterized by: go up the steel sheet frame groove and inlay in steel sheet frame groove down, go up the reliable installation of shock absorber between last steel sheet frame groove, lower steel sheet frame groove bottom plate, lower isolator is around steel sheet frame groove and between the terrace down, go up and form rigidity quality piece after the rag bolt concreting that sets up screw-thread steel welding erection equipment in the steel sheet frame groove, lower steel sheet frame groove bodily form is whole bottom plate, is all around all peripheral shape steel sheet frame groove, forms rigidity quality piece down after the peripheral shape steel sheet frame inslot sets up screw-thread steel concreting.

2. The composite vibration isolation mount of claim i, wherein: the groove of the upper steel plate frame is cubic or the lower part of the upper steel plate frame is a chamfered table, the upper part of the chamfered table is cubic, the top steel plate is outwards folded by 90 degrees, and the upper part of the chamfered table is an equipment mounting table board.

3. The composite vibration isolation mount of claim i, wherein: the steel plate at the top of the peripheral steel plate frame groove is inwards folded by 90 degrees, the outer folded angle of the steel plate at the top of the upper steel plate frame groove is arranged on the inner folded angle of the steel plate at the top of the peripheral steel plate frame groove, and the distance between the outer folded angle and the inner folded angle is 150% of the static load compression deformation of the upper shock absorber.

4. The composite vibration isolation mount of claim i, wherein: the distance between the lower steel plate frame groove bottom plate and the terrace is 150% of the static load compression deformation of the lower vibration isolator.

5. The composite vibration isolation mount of claim i, wherein: the upper shock absorber is a rubber shear shock absorber with the natural frequency of 6-8 Hz and the damping ratio of more than 0.07; the lower vibration isolator is an adjustable damping spring vibration isolator with the natural frequency of 2.5-4.5 Hz and the damping ratio of more than 0.02.

6. The composite vibration isolation mount of claim i, wherein: the concrete is C30 commercial concrete, and the weight ratio of the upper rigid mass block to the lower rigid mass block is 1: 1.8 to 2.5.

7. The composite vibration isolation mount of claim i, wherein: the upper vibration absorber and the lower vibration isolator are arranged symmetrically along the central axis of the composite vibration isolation base, and the load borne by the composite vibration isolation base is in the optimal load range.

Technical Field

The invention relates to a composite vibration isolation base for controlling and transforming vibration noise of equipment and preventing the propagation of vibration solids of the equipment.

Background

With the increasing number of electromechanical devices deployed in buildings, the impact of low frequency solid noise pollution from device vibration on human health has been demonstrated. Therefore, the national ministry of environmental protection has listed the indoor low-frequency noise control technology in the environmental protection technology catalog of the national encouragement for development every year since 2008. The technical name is as follows: indoor low-frequency noise and structure-borne noise pollution control equipment and an integrated control technology. The technical content is as follows: the technology adopts various vibration isolation systems such as high-efficiency low-frequency vibration isolation devices, vibration isolation bases and the like based on low-frequency noise and structure-borne noise analysis and identification technologies to control indoor noise. The vibration isolation efficiency is more than 95% in a broadband, and indoor low-frequency noise (below 200 Hz) and solid-borne noise can be reduced by more than 10dB by adopting an integrated control technology. The application range is as follows: low frequency noise and structure-borne noise pollution control for urban civil and public buildings.

The primary mode of propagation of equipment vibration noise is structural noise transmitted through building structures by low frequency vibrations. Damping the transmission of vibrations of the device is achieved by eliminating the rigid connection between them. The method for solving the problems at present is to arrange a vibration isolation base consisting of a rigid mass block and a vibration isolator between equipment and a building structure. As the equipment is started and closed, the rotating speed is in a certain stage in the change process of 0-rated rotating speed, the condition that the natural frequency of the damping spring vibration isolator is consistent with the disturbance frequency of the rotating equipment inevitably occurs, the resonance phenomenon is caused, and the vibration isolation is invalid. Under the condition that the requirement on equipment vibration isolation is high in a certain occasion, secondary vibration isolation is needed when primary vibration isolation cannot meet the requirement on vibration isolation. The vibration transmission of the secondary vibration isolation structure is further attenuated on the basis of the vibration transmission of the primary vibration isolation structure, so that the transmission ratio is smaller and the vibration isolation effect is better.

The transmissibility of vibration is inversely proportional to the fourth power of interference frequency, that is, the double-layer vibration isolation system has better vibration isolation effect on high-frequency vibration. The double-layer vibration isolation system has two natural frequencies, and in a frequency band above the second natural frequency, the vibration transmission rate of the double-layer vibration isolation system is rapidly reduced along with the increase of the frequency, so that the vibration isolation effect is better than that of the first-level vibration isolation system, but in a middle-low frequency band, due to the existence of the two natural frequencies, the vibration isolation effect is poor, and particularly in the vicinity of the second natural frequency. Furthermore, withm ₁The reduction of the transmission rate in the high frequency band tends to increase, so that the high frequency isolation capability of the system is improved; however, the natural frequency also shifts to a low frequency, and the corresponding peak value also rises rapidly, which deteriorates the medium and low frequency vibration isolation capability of the system and lowers the vibration isolation efficiency.

If the secondary vibration isolation structure is arranged, the primary and secondary vibration isolation structures are superposed, the defects that the total height of the vibration isolation structure is increased, the gravity center of equipment is increased, and the operation stability is influenced are caused. If the primary and secondary vibration isolation structures are arranged in an embedded mode, the defects that the effective mounting table top is insufficient in specification and narrow in application range are caused.

Disclosure of Invention

In order to overcome the defects that the total height of equipment is increased, the resonance phenomenon exists and the equipment starting displacement exists due to the fact that the secondary vibration isolation structure is arranged on the equipment, the invention aims to provide the secondary vibration isolation structure for the equipment, which is low in total height, can eliminate the resonance phenomenon and can effectively control the displacement of the equipment in the starting and closing stages.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an use compound vibration isolation base of secondary vibration isolation structure technique, includes the last steel sheet frame groove of primary vibration isolation structure, goes up the shock absorber, the lower steel sheet frame groove of secondary vibration isolation structure, isolator down, goes up the steel sheet frame groove and inlays under in steel sheet frame groove, goes up the shock absorber and reliably installs between last steel sheet frame groove, lower steel sheet frame groove bottom plate, and lower isolator is under between steel sheet frame groove all around and the terrace. An upper rigid mass block is formed after foundation bolts of the equipment for welding and installing the deformed steel bars in the upper steel plate frame groove are poured with concrete, a lower steel plate frame groove is formed into an integral bottom plate, all-around steel plate frame grooves are formed, and deformed steel bars are arranged in the all-around steel plate frame grooves and formed into a lower rigid mass block after the concrete is poured with the deformed steel bars.

The steel plate frame groove is arranged, the self weight of the composite vibration isolation base is reduced, the transportation and installation cost of the composite vibration isolation base can be greatly reduced, and the installation precision and the vibration isolation efficiency can be further improved. And after the composite vibration isolation base is installed, concrete is poured in situ.

The groove of the upper steel plate frame is cubic or the lower part of the groove is a chamfered table, the upper part of the chamfered table is cubic, the top steel plate is outwards folded by 90 degrees, and the cubic is an equipment mounting table board. The upper steel plate frame groove is shaped like a cube with the lower surface being a chamfered table and the upper surface being a cube, and the effective area of the equipment mounting table is enlarged on the premise of meeting the weight ratio of the upper rigid mass block. In order to ensure the structural strength of the installation position of the foundation bolt, the cube height of the upper steel plate frame groove is larger than 30mm, so that the structural rigidity of the upper rigid mass block is improved.

The steel plate at the top of the peripheral steel plate frame groove is inwards folded by 90 degrees, the outer folded angle of the steel plate at the top of the upper steel plate frame groove is arranged on the inner folded angle of the steel plate at the top of the peripheral steel plate frame groove, and the distance between the outer folded angle and the inner folded angle is 150% of the static load compression deformation of the upper shock absorber.

The distance between the lower steel plate frame groove bottom plate and the terrace is 150% of the static load compression deformation of the lower vibration isolator.

The upper shock absorber is a rubber shear shock absorber with the natural frequency of 6-8 Hz and the damping ratio of more than 0.07; the lower vibration isolator is an adjustable damping spring vibration isolator with the natural frequency of 2.5-4.5 Hz and the damping ratio of more than 0.02. The concrete is C30 commercial concrete, and the weight ratio of the upper rigid mass block to the lower rigid mass block is 1: 1.8 to 2.5. C30 concrete is poured, the structural rigidity of the upper rigid mass block and the lower rigid mass block is guaranteed, and the uniformity of vibration transmission is improved.

The upper vibration absorber and the lower vibration isolator are arranged symmetrically along the central axis of the composite vibration isolation base, and the load borne by the composite vibration isolation base is in the optimal load range.

The invention has the advantages of reducing the height of the secondary vibration isolation structure, controlling resonance and equipment displacement phenomena, defining the weight ratio of the upper rigid mass block and the lower rigid mass block, and effectively reducing the vibration solid transmission of the equipment structure.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a front sectional view showing a first embodiment of the composite vibration isolating base according to the present invention.

Fig. 2 is a top sectional configuration view of fig. 1.

Fig. 3 is a side sectional construction view of fig. 1.

FIG. 4 is a side sectional construction view of the second embodiment.

In the figure, 1, a primary vibration isolation structure, 11, an upper steel plate frame groove, 12, an installation table surface, 13, an external bevel angle, 14, an upper vibration absorber, 2, a secondary vibration isolation structure, 21, a lower steel plate frame groove, 22, a bottom plate, 23, a peripheral steel plate frame groove, 24, an internal bevel angle, 25, a lower vibration isolator, 3, equipment, 31, an anchor bolt, 32, concrete and 33, a terrace are arranged.

Detailed Description

In a first embodiment shown in fig. 1, 2 and 3, the composite vibration isolation base comprises an upper steel plate frame groove (11) of a primary vibration isolation structure (1), an upper vibration absorber (14), a lower steel plate frame groove (21) of a secondary vibration isolation structure (2) and a lower vibration isolator (22), wherein the upper steel plate frame groove (11) is embedded in the lower steel plate frame groove (21), the upper vibration absorber (12) is reliably installed at the bottom of the upper steel plate frame groove (11) and between the lower steel plate frame groove (21) and a bottom plate (22), and the lower vibration isolator (22) is arranged between the periphery of the lower steel plate frame groove (21) and a terrace (34). An upper rigid mass block is formed after concrete (32) is poured on foundation bolts (31) of the equipment (3) for welding and installing the threaded steel bars in the upper steel plate frame groove (11), the lower steel plate frame groove (21) is integrally formed into a whole bottom plate (22), peripheral steel plate frame grooves (23) are formed at the periphery, and the lower rigid mass block is formed after the concrete (32) is poured on the threaded steel bars in the peripheral steel plate frame grooves (23).

The steel plate frame mounting structure is characterized in that the upper steel plate frame groove body (11) is cubic, the cube is an equipment mounting table board (12), the cube height of the upper steel plate frame groove (11) is larger than 30mm, and the top steel plate is outwards bent at an angle (13) and the angle is 90 degrees.

The top steel plates of the peripheral steel plate frame grooves (23) are inwards bent at an angle (24) of 90 degrees, the top steel plate outwards bent angles (13) of the upper steel plate frame grooves (11) are arranged on the steel plate inwards bent angles (24) of the top of the peripheral steel plate frame grooves (23), and the distance between the steel plate inwards bent angles is 150% of the static load compression deformation of the upper shock absorber (14).

The distance between the bottom plate (22) of the lower steel plate frame groove (21) and the terrace (33) is 150% of the static load compression deformation of the lower vibration isolator (25).

The upper shock absorber (14) is a rubber shear shock absorber with the natural frequency of 6-8 Hz and the damping ratio of more than 0.07; the lower vibration isolator (25) is an adjustable damping spring vibration isolator with the natural frequency of 2.5-4.5 Hz and the damping ratio of more than 0.02. The concrete is C30 commercial concrete, and the weight ratio of the upper rigid mass block to the lower rigid mass block is 1: 1.8 to 2.5.

The upper vibration absorber (14) and the lower vibration absorber (22) are multiple and are symmetrically arranged along the central axis of the composite vibration isolation base, and the load bearing capacity of the composite vibration isolation base is in the optimal load range.

In a second embodiment shown in fig. 4, the upper steel plate frame groove body (11) is shaped like a chamfered table with a lower surface and a cube with an upper surface, and the cube is an equipment mounting table surface (12).

The field installation process of the composite vibration isolation base comprises the following steps:

1, selecting the model of a composite vibration isolation base according to the total load of a machine set containing media of equipment (3);

2, popping up the longitudinal and transverse axes of the equipment (3) on the terrace (33), and determining the installation position of the composite vibration isolation base according to the axes;

3, mounting a matched adjustable damping spring vibration isolator base on a terrace (33), and mounting an upper bolt on a bolt hole reserved in the composite vibration isolator base;

4, welding foundation bolts (31) of a base of the equipment (3) with threaded steel bars arranged in an upper steel plate frame groove (11); the gravity centers of the unit and accessories of the equipment (3) and the plane center of the mounting table top (12) of the upper steel plate frame groove (11) are on the same vertical line;

5, the length of the mounting table top (12) of the upper steel plate frame groove (11) is not less than the length of a common base of the unit of the equipment (3); the width of the base is not less than that of the common base of the unit of the equipment (3);

6, pouring concrete into the steel plate frame groove (11) and the peripheral steel plate frame groove (23) in an upward direction on site, and installing a unit of the equipment (3) after the concrete is initially set;

and 7, adjusting the horizontal flatness deviation and height of the plane of the adjusting pedestal of the composite vibration isolation base by rotating the lower nut of the damping spring vibration isolator.

The above embodiments are only used to further illustrate the composite vibration isolation base of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the protection scope of the technical solution of the present invention.