CN111677143A - Vertical vibration damper for vibration isolation building - Google Patents
Vertical vibration damper for vibration isolation building Download PDFInfo
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- CN111677143A CN111677143A CN202010666536.2A CN202010666536A CN111677143A CN 111677143 A CN111677143 A CN 111677143A CN 202010666536 A CN202010666536 A CN 202010666536A CN 111677143 A CN111677143 A CN 111677143A
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- 238000002955 isolation Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- 239000003190 viscoelastic substance Substances 0.000 claims abstract description 19
- 238000013016 damping Methods 0.000 claims abstract description 16
- 239000011229 interlayer Substances 0.000 claims abstract description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 12
- 239000010935 stainless steel Substances 0.000 claims abstract description 12
- 238000004873 anchoring Methods 0.000 claims abstract description 8
- 238000004381 surface treatment Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 16
- -1 polytetrafluoroethylene Polymers 0.000 claims description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 10
- 125000006850 spacer group Chemical group 0.000 claims description 7
- 238000004073 vulcanization Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 8
- 230000009467 reduction Effects 0.000 description 8
- 238000009434 installation Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Vibration Prevention Devices (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
A vertical vibration damping device for vibration isolation building comprises a stainless steel top plate with a contact surface subjected to mirror surface treatment, wherein the top plate is fixed on an upper buttress by utilizing a connecting sleeve and an upper anchoring bolt; the viscoelastic damper device comprises an outer steel cylinder and an inner steel cylinder, wherein the inner sleeve is coaxially and fixedly connected in the outer steel cylinder, the inner steel cylinder is inserted between the outer steel cylinder and the inner sleeve, and a viscoelastic material interlayer is adhered between the inner surface of the inner steel cylinder and the outer surface of the inner sleeve; the cylindrical helical spring is coaxially arranged between the outer side of the inner steel cylinder and the inner side of the outer steel cylinder, the upper bottom surface of the spring is propped against the upper bottom surface of the outer steel cylinder, and the lower bottom surface of the spring is propped against the lower bottom plate of the inner steel cylinder. The method has the advantages that the deformation in the horizontal plane of the structure is not influenced, the influence of subway operation on the vibration and secondary noise of the building can be effectively reduced, and the comfort level of personnel in the building and the safety of instruments and equipment are ensured; the damping function is exerted, and the steel cylindrical helical springs connected in parallel can improve the resetting speed of the viscoelastic damper so as to adapt to high-frequency vertical vibration caused by subway operation.
Description
Technical Field
The invention relates to the technical field of building vibration isolation, in particular to a vertical vibration damping device for a rail transit upper cover building.
Background
Along with the massive operation of urban rail transit lines in China, the adverse effects of urban rail transit on the environment along the line, particularly the problems of vibration and secondary structure noise are particularly obvious, and the urban rail transit has attracted wide attention of various social circles.
Vertical vibration isolation measures are basically established on the basis of building vibration isolation measures in the present stage, although vibration isolation supports can alleviate the problems of upper structures such as vibration and secondary structure noise caused by subway operation, the effect is limited, and therefore a device capable of reducing the vertical vibration of subway upper covers and buildings along the subway line is needed to be researched and realized urgently.
Disclosure of Invention
The invention aims to overcome the defects of poor pertinence and limited effect of vibration isolation measures for subway upper cover buildings in the prior art, and provides a vertical vibration damping device particularly suitable for the subway upper cover buildings.
The purpose of the invention is realized by the following technical scheme.
A vertical vibration damper for vibration isolation buildings is characterized in that a stainless steel top plate with a contact surface subjected to mirror surface treatment is arranged, and the top plate is fixed on an upper buttress by utilizing a connecting sleeve and an upper anchoring bolt; the viscoelastic damper device comprises an outer steel cylinder and an inner steel cylinder, wherein the inner part of the outer steel cylinder is coaxially and fixedly connected with a cup-shaped inner sleeve, the inner steel cylinder is inserted between the outer steel cylinder and the inner sleeve from bottom to top, a viscoelastic material interlayer is adhered between the inner surface of the inner steel cylinder and the outer surface of the inner sleeve, and the inner steel cylinder and the inner sleeve are connected together; a steel cylindrical helical spring is coaxially arranged between the outer side of the inner steel cylinder and the inner side of the outer steel cylinder, the upper bottom surface of the cylindrical helical spring is propped against the upper bottom surface of the outer steel cylinder, the lower bottom surface of the cylindrical helical spring is propped against the upper surface of the lower bottom plate of the inner steel cylinder, the lower bottom fixed ring plate of the outer steel cylinder and the lower bottom plate of the inner steel cylinder are adjustably fixed by a pre-tightening pull rod and a connecting sleeve in a ground pulling way, and the lower end of the pre-tightening pull rod is also used as a lower anchoring bolt to fix the lower bottom plate of the inner steel cylinder on a lower buttress; a polytetrafluoroethylene plate is pasted on the outer side face of the upper bottom of the cup-shaped inner sleeve, and the viscoelastic damper device is pressed against the lower side face of the stainless steel top plate through the polytetrafluoroethylene plate.
The pretightenable viscoelastic damper device is arranged below the top plate, the pretightenable viscoelastic damper device is in close contact with the stainless steel plate mirror surface and can freely slide in a plane, for a building constructed above a subway, the friction force in the plane can be ignored, namely, the horizontal friction force in the x direction and the horizontal friction force in the y direction are ignored, the main problem of vertical vibration, namely vibration in the z direction, is mainly solved, and the pretightenable viscoelastic damper device provides a damping ratio and consumes vibration energy when the building is subjected to vertical vibration. The contact position of the top of the viscoelastic damper device and the stainless steel mirror surface is controlled through the pre-tightening pull rod, certain pre-tightening force is generated, meanwhile, a layer of polytetrafluoroethylene plate is pasted on the top of the viscoelastic damper device, the friction coefficient in the horizontal direction is greatly reduced, the horizontal zero stiffness of the damper is basically realized, and the requirement of large displacement deformation in the plane of the vibration isolation layer is met.
The viscoelastic material interlayer can dissipate energy through shear deformation under the vertical vibration of a building to play a role in vibration reduction, and the steel cylindrical helical springs connected in parallel can improve the resetting speed of the viscoelastic damper so as to adapt to the high-frequency vertical vibration caused by subway operation.
Preferably, the viscoelastic material interlayer is formed by adhering the inner surface of the inner steel cylinder and the outer surface of the spacer bush together by adopting a viscoelastic material through high-temperature vulcanization, so that the inner steel cylinder and the outer steel cylinder are structurally connected into a whole.
Preferably, the cross section of the material of the cylindrical helical spring is a rectangular structure. The spring made of the rectangular section material can obtain larger load under the same installation space and the same deformation amount, and can store more energy from the viewpoint of energy than the spring made of the round section material. The cylindrical helical spring is made of a rectangular section material, so that the cylindrical helical spring is particularly significant because the cylindrical helical spring is required to be suitable for high-frequency vertical vibration caused by subway operation, the rigidity of the cylindrical helical spring is required to be improved as much as possible, and the limitation of narrow space of a component is also considered.
Preferably, the structure of the pre-tensioning rod comprises a lower section used as a lower anchoring bolt and an upper section used as a tensioning adjusting rod, wherein the upper end of the lower section and the upper end of the upper section are respectively provided with a thread and are respectively provided with a nut; wherein the thread of the upper section is a fine thread. The fine thread is adopted to improve the fineness of adjustment. The pre-pull rod is used for pre-pulling the upper steel sleeve to a position on a structure before the support is installed, and the pre-pulling force can be removed after the support is installed, so that the viscoelastic material can be kept in an unstressed state before and after installation.
Preferably, the diameter of the lower section as the lower anchor bolt is larger than the diameter of the upper section as the tensioning adjusting rod.
The invention has the beneficial effects that:
1. the viscoelastic damper device capable of being pre-tightened is arranged below the top plate, and the viscoelastic damper device is in free contact with the stainless steel plate mirror surface, so that for a building built on a subway upper cover, vertical vibration reduction can be realized only, deformation in a horizontal plane of a structure is not influenced, the influence of subway operation on vibration and secondary noise of the building can be effectively reduced, and the comfort level of personnel in the building and the safety of instruments and equipment are ensured;
2. the viscoelastic material interlayer can dissipate energy through shear deformation under the vertical vibration of a building to play a role of vibration reduction, and the steel cylindrical helical springs connected in parallel can improve the resetting speed of the viscoelastic damper so as to adapt to the high-frequency vertical vibration caused by subway operation and achieve advantage complementation;
3. the problem of vertical creep generated by the building or the rubber vibration isolation support can be solved by adjusting the pre-tightening pull rod;
4. the horizontal deformation of the upper part and the lower part of the vibration isolation layer of the vibration isolation building is not influenced;
5. the installation and the replacement are convenient, and no special measure is needed for maintenance in the working process;
6. the problems of the upper and lower clearances and the pre-pressure of the damper can be solved by adjusting the pre-tightening pull rod, and the vertical vibration reduction efficiency is improved;
7. fine thread fine adjustment is adopted for adjusting the pre-tensioning rod, and the adjustment is fine;
8. the material section of the cylindrical spiral spring is of a rectangular structure, and the spring made of the rectangular section material can obtain larger load under the same installation space and the same deformation, especially for high-frequency vertical vibration caused by subway operation. The cylindrical helical spring is made of a rectangular section material, so that the cylindrical helical spring is particularly significant because the rigidity of the cylindrical helical spring is required to be improved as much as possible to adapt to high-frequency vertical vibration caused by the operation of a subway train, and the limitation of narrow space where components are located is also considered.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is an appearance diagram of an embodiment.
Fig. 3 is a schematic sectional view a-a of fig. 2.
In the figure: a top plate 1; a connecting sleeve 2; an upper anchor bolt 3; an upper buttress 4; a polytetrafluoroethylene sheet 5; a viscoelastic damper device 6; an outer steel cylinder 7; a spacer 8; an inner steel cylinder 9; a viscoelastic material interlayer 10; a cylindrical coil spring 11; a lower base plate 12; a lower bottom fixing ring plate 13; a pre-tightening pull rod 14; a lower buttress 15.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
Example (b): a vertical vibration damper for vibration isolation building comprises a stainless steel top plate 1 with a contact surface subjected to mirror surface treatment, wherein the top plate 1 is fixed on an upper buttress 4 by a connecting sleeve 2 and an upper anchor bolt 3; a viscoelastic damper device 6 is arranged under the top plate 1 through a polytetrafluoroethylene plate 5, the viscoelastic damper device 6 comprises an outer steel cylinder 7 of the polytetrafluoroethylene plate 5, the top surface of the outer steel cylinder 7 is pressed against the lower surface of the stainless steel top plate 1, the polytetrafluoroethylene plate 5 is adhered with the outer steel cylinder 7, a spacer 8 is fixedly connected with the middle inside of the outer steel cylinder 7, a viscoelastic material interlayer 10 is clamped between the inner surface of an inner steel cylinder 9 and the outer surface of the spacer 8, a steel cylindrical helical spring 11 is coaxially arranged between the outer side of the inner steel cylinder 9 and the inner side of the outer steel cylinder 7, the upper bottom surface of the cylindrical helical spring 11 is pressed against the upper bottom surface of the outer steel cylinder 7, the lower bottom surface of the cylindrical helical spring 11 is pressed against the upper surface of a lower bottom plate 12 of the inner steel cylinder 9, a lower fixed ring plate 13 of the outer steel cylinder 7 and the lower bottom plate 12 of the inner steel cylinder 9 are adjustably tightened and fixed through a pre-tightening pull, the lower end of the pre-tightening tie rod 14 doubles as a lower anchor bolt to fix the lower base plate 12 of the inner steel cylinder 9 to the lower buttress 15.
The embodiment adopts the viscoelastic damper device 6 which can be pre-tightened and is arranged below the top plate 1, the viscoelastic damper device 6 which can be pre-tightened and is freely contacted with the mirror surface of the stainless steel top plate, for the building which is built on the subway, the main contradiction that the minor and relatively slight longitudinal vibration and transverse vibration can be ignored, namely the vibration in the x direction and the y direction can be ignored, the relatively larger and most main vertical vibration, namely the vibration in the z direction can be highlighted and grasped, and the viscoelastic damper device 6 provides a damping ratio under the vertical vibration of the building and consumes the vibration energy. The method for catching the main contradiction replaces three-dimensional vibration reduction with one-dimensional vibration reduction, greatly simplifies design and manufacturing procedures, greatly reduces cost, and does not reduce the actual vibration reduction effect under the specific environment of the upper part of the subway. The contact force between the top of the viscoelastic damper device 6 and the mirror surface of the stainless steel top plate 1 is controlled and adjusted through the pre-tightening pull rod 14 to enable the contact force to be proper and no gap is generated, meanwhile, the polytetrafluoroethylene plate 5 is adhered to the top of the viscoelastic damper device 6, the friction coefficient in the horizontal direction is greatly reduced, the zero stiffness of the damper in the horizontal direction is basically achieved, and the requirement of large displacement deformation of the vibration isolation layer is met.
The viscoelastic material interlayer 10 is formed by adhering the inner surface of the inner steel cylinder 9 and the outer surface of the spacer 8 together by high-temperature vulcanization by using an organic viscoelastic material, so that the inner steel cylinder 9 and the outer steel cylinder 7 are structurally connected into a whole. The viscoelastic material interlayer 10 can dissipate energy through shearing deformation under the vertical vibration of a building, the vibration damping effect is exerted, and the steel cylindrical spiral spring 11 connected with the viscoelastic material interlayer 10 in parallel has the effect of improving the resetting speed of the viscoelastic damper so as to adapt to the high-frequency vertical vibration caused by subway operation.
The viscoelastic material interlayer 10 forms shear-shaped damping by being clamped between the inner surface of the inner steel cylinder 9 and the outer surface of the spacer 8, and deforms under the tangential loading force, namely, energy is emitted, the damping magnitude is closely related to the material, and the damping of non-metallic materials such as asphalt and epoxy resin is far higher than that of steel materials. Because the internal damping function of the viscoelastic material interlayer 10 is more prominent than that of the steel spiral spring 11, for example, for the change of vibration frequency caused by deceleration and acceleration when a subway train enters or exits a station, the viscoelastic material interlayer 10 is matched with the steel spiral spring 11, the advantages are complementary, the dynamic stiffness of the device is improved, the resonance of wide frequency is effectively avoided, and therefore the energy dissipation and noise reduction effects are better.
The material section of the steel cylindrical coil spring 11 is rectangular, and the spring made of the rectangular section material can obtain larger load under the same installation space and the same deformation amount, and the spring made of the rectangular section material can store more energy from the energy point of view than the spring made of the round section material, namely can absorb more external vibration energy when the spring made of the rectangular section material is deformed, or can save more space under the same vibration damping effect than the spring made of the round section material.
Example 2: the pre-tensioning rod 14 has a structure including a lower section as an anchor bolt and an upper section as a tensioning adjustment rod, and the upper end of the lower section and the upper end of the upper section are respectively provided with a thread and are respectively provided with a nut; wherein the screw thread of upper segment is fine thread, adopts fine thread to do benefit to the fineness that improves the adjustment. Meanwhile, for the requirement of the installation process, the diameter of the lower section needs to be larger than that of the upper section, because the pre-tightening rod 14 is used as a lower anchoring bolt and is generally pre-fixed in the concrete of the lower buttress 15 before assembly connection, a nut which is correspondingly matched needs to be installed from the upper end during assembly, the diameter of the lower section is larger than that of the upper section, so that the inner diameter of the nut which is matched with the lower anchoring bolt is larger than that of the upper section, and the nut can conveniently pass through the upper section and then be matched and fastened with the lower section. The rest of the structure is the same as that of example 1.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A vertical vibration damper for vibration isolation buildings is characterized in that a stainless steel top plate with a contact surface subjected to mirror surface treatment is arranged, and the top plate is fixed on an upper buttress by utilizing a connecting sleeve and an upper anchoring bolt; the viscoelastic damper device comprises an outer steel cylinder and an inner steel cylinder, wherein the inner part of the outer steel cylinder is coaxially and fixedly connected with a cup-shaped inner sleeve, the inner steel cylinder is inserted between the outer steel cylinder and the inner sleeve from bottom to top, a viscoelastic material interlayer is adhered between the inner surface of the inner steel cylinder and the outer surface of the inner sleeve, and the inner steel cylinder and the inner sleeve are connected together; a steel cylindrical helical spring is coaxially arranged between the outer side of the inner steel cylinder and the inner side of the outer steel cylinder, the upper bottom surface of the cylindrical helical spring is propped against the upper bottom surface of the outer steel cylinder, the lower bottom surface of the cylindrical helical spring is propped against the upper surface of the lower bottom plate of the inner steel cylinder, the lower bottom fixed ring plate of the outer steel cylinder and the lower bottom plate of the inner steel cylinder are adjustably fixed by a pre-tightening pull rod and a connecting sleeve in a ground pulling way, and the lower end of the pre-tightening pull rod is also used as a lower anchoring bolt to fix the lower bottom plate of the inner steel cylinder on a lower buttress; a polytetrafluoroethylene plate is pasted on the outer side face of the upper bottom of the cup-shaped inner sleeve, and the viscoelastic damper device is pressed against the lower side face of the stainless steel top plate through the polytetrafluoroethylene plate.
2. The vertical vibration damping device for a vibration isolating building according to claim 1, wherein the viscoelastic material interlayer is formed by adhering the inner surface of the inner steel cylinder and the outer surface of the spacer together by high temperature vulcanization using a viscoelastic material, thereby structurally integrating the inner steel cylinder and the outer steel cylinder.
3. The vertical vibration damping device for vibration isolation building as claimed in claim 1 or 2, wherein the material section of said cylindrical coil spring is rectangular structure.
4. The vertical vibration damping device for vibration isolation buildings according to claim 3, wherein the pre-tightening rod structure comprises a lower section as a lower anchor bolt and an upper section as a tightening adjustment rod, and the upper end of the lower section and the upper end of the upper section are respectively provided with a thread and are respectively provided with a nut; wherein the thread of the upper section is a fine thread.
5. The vertical vibration damping device for vibration isolation building according to claim 4, wherein the diameter of the lower section as the lower anchor bolt is larger than the diameter of the upper section as the tightening adjustment rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010666536.2A CN111677143A (en) | 2020-07-10 | 2020-07-10 | Vertical vibration damper for vibration isolation building |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010666536.2A CN111677143A (en) | 2020-07-10 | 2020-07-10 | Vertical vibration damper for vibration isolation building |
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| CN111677143A true CN111677143A (en) | 2020-09-18 |
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| CN202010666536.2A Pending CN111677143A (en) | 2020-07-10 | 2020-07-10 | Vertical vibration damper for vibration isolation building |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187104A (en) * | 2021-05-27 | 2021-07-30 | 扬州工业职业技术学院 | Friction energy consumption self-resetting full-assembly type node |
| CN113247307A (en) * | 2021-04-15 | 2021-08-13 | 东南大学 | Spherical mechanical foot of lunar traveling mechanism with multidirectional vibration reduction function and vibration reduction method thereof |
| CN114395948A (en) * | 2022-01-05 | 2022-04-26 | 北京九州一轨环境科技股份有限公司 | Tuned mass damper vibration reduction control device suitable for vibration reduction track |
| CN115155954A (en) * | 2022-07-13 | 2022-10-11 | 刘建平 | Dispensing equipment for integrated circuit production and processing |
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| CN212582947U (en) * | 2020-07-10 | 2021-02-23 | 宁波东衡工程科技发展有限公司 | Vertical vibration damper for vibration isolation building |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113247307A (en) * | 2021-04-15 | 2021-08-13 | 东南大学 | Spherical mechanical foot of lunar traveling mechanism with multidirectional vibration reduction function and vibration reduction method thereof |
| CN113247307B (en) * | 2021-04-15 | 2022-06-17 | 东南大学 | Spherical mechanical foot of lunar traveling mechanism with multidirectional vibration reduction function and vibration reduction method thereof |
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| CN114395948A (en) * | 2022-01-05 | 2022-04-26 | 北京九州一轨环境科技股份有限公司 | Tuned mass damper vibration reduction control device suitable for vibration reduction track |
| CN115155954A (en) * | 2022-07-13 | 2022-10-11 | 刘建平 | Dispensing equipment for integrated circuit production and processing |
| CN115155954B (en) * | 2022-07-13 | 2024-01-12 | 优百顺集团有限公司 | Dispensing equipment for integrated circuit production and processing |
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