CN211228070U - Columnar tooth type self-resetting energy-consumption bridge shock insulation support - Google Patents
Columnar tooth type self-resetting energy-consumption bridge shock insulation support Download PDFInfo
- Publication number
- CN211228070U CN211228070U CN201921417136.7U CN201921417136U CN211228070U CN 211228070 U CN211228070 U CN 211228070U CN 201921417136 U CN201921417136 U CN 201921417136U CN 211228070 U CN211228070 U CN 211228070U
- Authority
- CN
- China
- Prior art keywords
- block
- toothed
- steel plate
- toothed curved
- plate layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
The utility model relates to an antidetonation technical field especially relates to a column tooth type is from restoring to throne energy consumption bridge shock insulation support. The upper rubber steel plate layer is arranged on the upper support plate; the upper support plate and the lower support plate are rigidly connected with the transverse bridge direction stop block; the upper rubber steel plate layer is connected with the upper stop block, and the lower rubber steel plate layer is connected with the lower stop block; the upper rubber steel plate layer is rigidly connected with the upper toothed curved block, and the lower rubber steel plate layer is rigidly connected with the lower toothed curved block; the utility model discloses can satisfy the demand of multistage fortification, under the action of the earthquake frequently, the support passes through the shear force key power consumption, under the action of the earthquake rarely meets, the support causes the lifting of support superstructure through the rotation of taking the tooth cylindroid and the relative displacement of upper and lower tooth curved surface piece and then effectively consumes energy.
Description
Technical Field
The utility model relates to an antidetonation technical field especially relates to a column tooth type is from restoring to throne energy consumption bridge shock insulation support.
Background
With the successive occurrence of major earthquakes such as Wenchuan and Yushu, China pays more and more attention to bridge earthquake-proof technology and devices, and various earthquake-proof technologies and devices are gradually applied to engineering practices in large quantities, so that necessary guarantee is provided for production and property safety of people. In the continuous girder bridge, since the abutment occupies most of the installation space of the top of the pier, it is often difficult for other anti-seismic devices to find a proper installation position. Therefore, the anti-seismic support formed by combining various anti-seismic devices and the support becomes a conventional anti-seismic device of the continuous beam bridge. The anti-seismic support has the functions of a support and an anti-seismic device, and also has the advantages of small installation space and good economical efficiency, is rapidly developed in China in recent years, forms a series of products and is about to release relevant specifications, and is a preferred anti-seismic scheme of the continuous beam bridge at present. However, the support is used as a weak link in a bridge, the support is easy to fail under the action of an earthquake, and the condition that the support is damaged and even a main beam is damaged is not enumerated. Therefore, it is more critical to improve the performance and prolong the service life of the support.
The friction pendulum support is taken as a typical seismic isolation and reduction support, the main principle is that the basic natural vibration period of the structure is greatly prolonged through a specific arc surface, and seismic energy is converted into heat energy through a material with high wear resistance, high temperature resistance and stable and adjustable friction coefficient, so that the purposes of seismic isolation and energy consumption are achieved. However, the existing friction pendulum support has many problems. On one hand, the friction coefficient of the conventional friction pendulum support cannot effectively adapt to the temperature strain of the bridge main body in the working process; on the other hand, the existing structure plane can drive the swinging block to slide only when sliding to the end, collision impact is generated in the support in the whole swinging process, the operation safety and reliability are low, and the service life of the support is short; the more serious point is that when the structure of the existing friction pendulum support is displaced to consume energy under the action of an earthquake, the stress area is small, the stress is uneven, and the structure is easily damaged. In addition, the traditional friction pendulum support only has an energy consumption surface of a simple pendulum, and the other spherical surface meets the requirement of a corner when used for swinging.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of prior art, adapt to reality needs, provide a column tooth type is from restoring to throne power consumption bridge shock insulation support.
In order to realize the utility model discloses a purpose, the utility model discloses a technical scheme do: a columnar tooth type self-resetting energy-consumption bridge seismic isolation bearing comprises an upper bearing plate 11, a lower bearing plate 12, an upper rubber steel plate layer 21, a lower rubber steel plate layer 22, an upper toothed curved block 3, a lower toothed curved block 4, a toothed elliptic column 6, a shear key 7, a middle upper limiting block 51, a middle lower limiting block 52, an upper blocking block 91, a lower blocking block 92 and a transverse bridge direction blocking block 10; the upper support plate 11 and the lower support plate 12 are rigidly connected with the transverse bridge direction stop block 10; the upper rubber steel plate layer 21 is connected with an upper stop block 91, and the lower rubber steel plate layer 22 is connected with a lower stop block 92; the upper rubber steel plate layer 21 is rigidly connected with the upper toothed curved block 3, and the lower rubber steel plate layer 22 is rigidly connected with the lower toothed curved block 4; the tooth surface of the upper toothed curved surface block 3 is meshed with straight strip-shaped teeth in the middle of the upper part of the toothed elliptic cylinder 6; the toothed surface of the lower toothed curved surface block 4 is meshed with straight-strip teeth in the middle part below the toothed elliptic cylinder 6; the upper toothed curved block 3 and the lower toothed curved block 4 are connected through a shear key 7, and dust covers 8 are arranged on two sides of the upper toothed curved block 3 and the lower toothed curved block 4; the upper toothed curved surface block 3 is connected with a middle upper limiting block 51; the middle lower limit block 52 is connected with the lower toothed curved block 4.
In the two sides of the support, the transverse bridge direction stop blocks 10 are rigidly connected with the upper support plate 11 and the lower support plate 12 in the transverse bridge direction, in the longitudinal bridge direction, the upper stop blocks 91 are rigidly connected with the upper support plate 11, and the lower stop blocks 92 are rigidly connected with the lower support plate 12.
In the vertical direction, a certain gap is left between the upper block 91 and the upper rubber steel plate layer 21, and a certain gap is left between the lower block 92 and the lower rubber steel plate layer 22.
The upper toothed curved surface block 3, the lower toothed curved surface block 4 and the toothed elliptic cylinder 6 are provided with straight strip-shaped teeth which are mutually adaptive.
Under the normal working state of the support, the upper toothed curved block 3 and the lower toothed curved block 4 are meshed with the middle rack of the toothed elliptic cylinder 6.
The displacement of the toothed elliptic cylinder 6 is limited by the middle upper limit block 51 and the middle lower limit block 52 arranged at both sides of the upper toothed curved block 3 and the lower toothed curved block 4.
The upper toothed curved block 3 and the lower toothed curved block 4 are connected through a shear key with appropriate strength.
And dust covers 8 for protecting the internal structure are arranged on two sides of the upper toothed curved block 3 and the lower toothed curved block 4.
The beneficial effects of the utility model reside in that:
1. the invention is provided with an upper rubber steel plate layer and a lower rubber steel plate layer, and a certain gap is reserved between the upper rubber steel plate layer and the lower rubber steel plate layer as well as the upper stop block and the lower stop block so as to adapt to the temperature strain of a main beam and a capping beam.
2. The invention rotates through the meshing action between the gears, has lower requirement on the rotating space, is not easy to collide in the rotating process, and has high safety and reliability.
3. The invention arranges the middle upper and lower limiting blocks at two sides of the concave teeth of the upper and lower toothed curved blocks to limit the rotation angle of the toothed elliptic cylinder, reduce the overturning danger and effectively avoid the phenomenon that different components are separated from each other.
4. The invention adopts the toothed elliptic cylindrical component for rotation, has larger stress area, more uniform stress, difficult damage of the component, stronger seismic isolation performance and longer service life of the support.
5. The invention can realize good self-reset function after earthquake through the action of gravity and the meshing action of the gears.
6. The invention can meet the requirement of multi-stage fortification, the support consumes energy through the shear key under the action of frequent earthquakes, and the support effectively consumes energy through the lifting of the upper structure of the support caused by the rotation of the toothed elliptic cylinder and the relative displacement of the upper toothed curved surface block and the lower toothed curved surface block under the action of rare earthquakes.
Drawings
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is a front sectional view of the columnar tooth type self-resetting energy-consumption bridge seismic isolation support.
Fig. 2 is a top view of the columnar tooth type self-resetting energy-consuming bridge seismic isolation bearing.
Fig. 3 is a side view of the stud-tooth type self-resetting energy-consuming bridge seismic isolation bearing.
Fig. 4 and 5 are schematic rotation diagrams of the columnar tooth type self-resetting energy-consumption bridge seismic isolation support under the action of rare earthquakes.
Fig. 6 and 7 are detailed views of toothed elliptic cylinders of the column-tooth type self-resetting energy-consumption bridge seismic isolation bearing.
Fig. 8 is a schematic diagram of the arrangement of the studs of the stud-tooth type self-resetting energy-consuming bridge seismic isolation bearing.
Wherein, 11 the upper support plate 12, the lower support plate 21, the rubber steel plate layer 22, the upper rubber steel plate layer 3, the lower toothed curved block 4, the lower toothed curved block 51, the middle upper limiting block 52, the middle lower limiting block 6, the toothed elliptic cylinder 7, the shear key 8, the upper block 92, the lower block 91, the lower block 92, the transverse bridge block are arranged.
Detailed Description
The invention will be further described with reference to the following figures and examples:
see fig. 1-8.
The utility model discloses a post tooth type is from restoring to throne power consumption bridge shock insulation support, including last dog and lower dog, go up rubber steel deck and lower rubber steel deck go up rubber steel deck and be equipped with upper and lower tooth curved surface piece between rubber steel deck and the lower rubber steel deck be equipped with a tooth elliptical column in the middle of the upper and lower tooth curved surface piece, upper and lower tooth curved surface piece contacts with the rack toothing through the middle part between the tooth elliptical column, and upper and lower tooth curved surface piece passes through the shear force key and links to each other upper and lower tooth curved surface piece both sides cross bridge upwards is equipped with the cross bridge to the dog.
The working principle of the support is as follows:
(1) under the working condition of normal use, the upper rubber steel plate layer and the lower rubber steel plate layer are connected with the upper support plate and the lower support plate to adapt to the temperature strain of a bridge, the upper toothed curved block and the lower toothed curved block are meshed with the racks in the middle of the toothed elliptic column to serve as supports, gaps are reserved between the upper toothed curved block and the lower toothed curved block which are adaptive to each other and the adjacent racks in the middle of the toothed elliptic column, transverse bridge direction stop blocks are arranged upwards on transverse bridges of the upper rubber steel plate layer and the lower rubber steel plate layer to limit transverse bridge direction displacement of the supports, and the upper toothed curved block and the lower toothed curved block are connected through shear keys to limit longitudinal bridge direction displacement of the upper.
(2) Under the action of multiple earthquakes, the upper toothed curved surface block and the lower toothed curved surface block are constrained with each other through the shear keys, so that the upper toothed curved surface block and the lower toothed curved surface block do not have relative displacement, and the acting force under the multiple earthquakes is not enough to destroy the shear keys connected with the upper toothed curved surface block and the lower toothed curved surface block, so that the toothed elliptic cylinder does not generate displacement.
(3) Under the action of rare earthquakes, the longitudinal seismic force in the bridge direction is enough to destroy a shear key between an upper toothed curved block and a lower toothed curved block, the toothed elliptic cylinder is subjected to large acting force and rotates along the longitudinal seismic direction, the toothed elliptic cylinder can lift the upper toothed curved block in the rotating process due to mutual meshing of racks, the energy of the earthquakes is consumed by converting the energy into potential energy, the upper limiting block and the lower limiting block in the middle parts, arranged on the two sides of the upper toothed curved block and the lower toothed curved block, limit the upward relative displacement of the longitudinal bridge of the upper toothed curved block and the lower toothed curved block and avoid overturning, the transverse bridge-direction stopping blocks on the two sides of the upper toothed curved block and the lower toothed curved block limit the upward displacement of the support along the transverse bridge, and after the earthquakes, the toothed elliptic cylinder can perform self.
The invention can adapt to the different requirements of the horizontal seismic force limit values (or rigidity) in the longitudinal and transverse bridge directions by changing the strength of the shear key, the size or material of the toothed elliptic column, the size and material of the toothed curved surface block and the strength or material of the upper stop block, the lower stop block and the transverse bridge direction stop block. Under the action of earthquakes of different levels, multistage fortification can be achieved, displacement is limited through the shear key under the action of frequent earthquakes, and under the action of rare earthquakes, the upper component can be lifted through rotation of the toothed elliptic cylinder to effectively consume earthquake energy. Because the upper and lower toothed curved blocks are provided with the upper and lower limiting blocks in the middle, the rotation angle of the toothed elliptic cylinder can be well limited, the overturning phenomenon is prevented, and the self-resetting function of the toothed elliptic cylinder can be enhanced. On the other hand, the upper rubber steel plate layer and the lower rubber steel plate layer can adapt to deformation caused by temperature change of the bridge, and transverse bridge direction stop blocks arranged on two sides of the toothed curved surface block along the transverse bridge direction can limit upward displacement of the transverse bridge of the support.
Preferably, the upper support plate is connected with the upper rubber steel plate layer through a stud, the upper support plate is connected with the main beam through a stud, the lower support plate is connected with the lower rubber steel plate layer through a stud, and the lower support plate is connected with the bent cap through a stud.
Preferably, the upper rubber steel plate layer is connected with the upper toothed curved block through a stud, the lower rubber steel plate layer is connected with the lower toothed curved block through a stud, and a certain gap is reserved between the upper rubber steel plate layer and the lower rubber steel plate layer and between the upper rubber steel plate layer and.
Preferably, the lower part of the upper toothed curved surface block is provided with an annular toothed groove concave surface matched with the toothed elliptic cylinder, and two sides of the toothed groove are provided with a middle upper limiting block and a middle lower limiting block which are limited.
Preferably, the upper part of the lower toothed curved surface block is provided with an annular toothed groove concave surface which is matched with the toothed elliptic cylinder, and two sides of the toothed groove are provided with a middle upper limiting block and a middle lower limiting block which are limited.
Preferably, the two sides of the upper and lower toothed curved blocks are provided with transverse bridge direction stoppers along the transverse bridge direction to limit the upward displacement of the transverse bridge of the support.
Preferably, the shear key connecting the upper toothed curved block and the lower toothed curved block adopts a shear key with proper strength and convenient replacement. Can be used for a plurality of times under the action of a plurality of earthquakes.
Preferably, the middle upper and lower limiting blocks are welded to the upper and lower toothed curved blocks, and are sized to limit the displacement of the upper and lower toothed curved blocks and the toothed elliptic cylinder.
Preferably, the upper and lower toothed curved blocks are in spacing fit with adjacent racks of the toothed elliptic cylinder, so that the toothed elliptic cylinder can conveniently rotate along the longitudinal bridge direction to consume energy under the action of rare earthquakes.
Preferably, the size of the toothed elliptic cylinder and the space between the racks of the upper toothed curved block and the lower toothed curved block, and the size of the toothed elliptic cylinder and the space between the racks of the upper toothed curved block and the lower toothed curved block can adopt reasonable space and size, so that the toothed elliptic cylinder can conveniently rotate and generate relative displacement energy consumption with the upper toothed curved block and the lower toothed curved block, meanwhile, the overturning phenomenon can be prevented, and the device.
The upper and lower stop blocks are rigidly connected with the upper and lower support plates.
The upper and lower support plates are rigidly connected with the transverse bridge direction stop block.
The upper and lower support plates are connected with the upper and lower rubber steel plate layers through studs.
The upper rubber steel plate layer and the lower rubber steel plate layer are connected with the upper toothed curved block and the lower toothed curved block through studs.
The upper toothed curved surface block and the lower toothed curved surface block are connected through a shear key.
Dust covers are arranged on two sides of the upper toothed curved block and the lower toothed curved block.
The upper and lower toothed curved blocks are provided with upper and lower limit blocks in the middle, which are matched with the toothed elliptic cylinder in shape and size, and the upper and lower limit blocks in the middle are rigidly connected with the upper and lower toothed curved blocks.
Under the normal use working condition of the support, the support adapts to the temperature strain of the bridge through the upper rubber steel plate layer and the lower rubber steel plate layer. The lower concave tooth socket of the upper toothed curved block is meshed with the middle rack at the upper part of the toothed elliptic cylinder, and the upper concave tooth socket of the lower toothed curved block is meshed with the middle rack at the lower part of the toothed elliptic cylinder to be used as a support. The shear key limits the displacement between the upper and lower toothed curved blocks.
And under the action of rare earthquake, the shear bond is broken, the toothed elliptic cylinder rotates upwards along the longitudinal bridge, and the main beam is lifted to consume earthquake energy. The upper and lower limiting blocks in the middle limit the rotation angle of the toothed elliptic cylinder to prevent the overturning phenomenon. The upper and lower stop blocks limit upward displacement of the longitudinal bridge of the support during earthquake. And the transverse bridge-direction stop blocks limit the upward displacement of the transverse bridge of the support during earthquake. After the earthquake, the toothed elliptic cylinder is self-restored through the gravity action and the gear meshing action. After an earthquake, the support can be reused by replacing the shear key.
The above mentioned is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings or the direct or indirect application in the related technical field are included in the patent protection scope of the present invention.
Claims (8)
1. The utility model provides a column tooth type is from restoring to throne energy consumption bridge isolation bearing which characterized in that: the device comprises an upper support plate (11), a lower support plate (12), an upper rubber steel plate layer (21), a lower rubber steel plate layer (22), an upper toothed curved block (3), a lower toothed curved block (4), a toothed elliptic column (6), a shear key (7), a middle upper limiting block (51), a middle lower limiting block (52), an upper stop block (91), a lower stop block (92) and a transverse bridge stop block (10); the upper support plate (11) and the lower support plate (12) are rigidly connected with the transverse bridge direction stop block (10); the upper rubber steel plate layer (21) is connected with an upper stop block (91), and the lower rubber steel plate layer (22) is connected with a lower stop block (92); the upper rubber steel plate layer (21) is rigidly connected with the upper toothed curved block (3), and the lower rubber steel plate layer (22) is rigidly connected with the lower toothed curved block (4); the tooth surface of the upper toothed curved surface block (3) is meshed with the straight strip-shaped teeth in the middle of the upper part of the toothed elliptic cylinder (6); the tooth surface of the lower toothed curved surface block (4) is meshed with straight-strip-shaped teeth in the middle of the lower part of the toothed elliptic cylinder (6); the upper toothed curved block (3) is connected with the lower toothed curved block (4) through a shear key (7), and dust covers (8) are arranged on two sides of the upper toothed curved block (3) and the lower toothed curved block (4); the upper toothed curved surface block (3) is connected with an upper limit block (51) in the middle; the middle lower limit block (52) is connected with the lower toothed curved block (4).
2. The post-tooth type self-resetting energy-consumption bridge vibration-isolating support as claimed in claim 1, wherein the transverse bridge direction stop blocks (10) are rigidly connected with the upper support plate (11) and the lower support plate (12) in the transverse bridge direction on two sides of the support, the upper stop blocks (91) are rigidly connected with the upper support plate (11) in the longitudinal bridge direction, and the lower stop blocks (92) are rigidly connected with the lower support plate (12).
3. The post-tooth type self-resetting energy-dissipating bridge seismic isolation bearing according to claim 1, wherein a certain gap is left between the upper stop block (91) and the upper rubber steel plate layer (21) and a certain gap is left between the lower stop block (92) and the lower rubber steel plate layer (22) in the longitudinal bridge direction.
4. The column-tooth type self-resetting energy-consumption bridge seismic isolation bearing according to claim 1, characterized in that the upper toothed curved block (3), the lower toothed curved block (4) and the toothed elliptic cylinder (6) are provided with mutually adapted straight strip-shaped teeth.
5. The column-tooth type self-resetting energy-consumption bridge seismic isolation bearing according to claim 1, wherein under a normal working state of the bearing, the upper toothed curved block (3) and the lower toothed curved block (4) are meshed with a rack in the middle of the toothed elliptic cylinder (6).
6. The columnar tooth type self-resetting energy-consumption bridge seismic isolation bearing according to claim 1, wherein the displacement of the toothed elliptic column (6) is limited by an upper middle limiting block (51) and a lower middle limiting block (52) which are arranged at two sides of the upper toothed curved block (3) and the lower toothed curved block (4).
7. The columnar tooth type self-resetting energy-consumption bridge seismic isolation bearing according to claim 1, wherein the upper toothed curved block (3) and the lower toothed curved block (4) are connected through a shear key with proper strength.
8. The columnar tooth type self-resetting energy-consumption bridge seismic isolation bearing according to claim 1, wherein dust covers (8) for protecting internal structures are arranged on two sides of the upper toothed curved block (3) and the lower toothed curved block (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921417136.7U CN211228070U (en) | 2019-08-29 | 2019-08-29 | Columnar tooth type self-resetting energy-consumption bridge shock insulation support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921417136.7U CN211228070U (en) | 2019-08-29 | 2019-08-29 | Columnar tooth type self-resetting energy-consumption bridge shock insulation support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211228070U true CN211228070U (en) | 2020-08-11 |
Family
ID=71918587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921417136.7U Expired - Fee Related CN211228070U (en) | 2019-08-29 | 2019-08-29 | Columnar tooth type self-resetting energy-consumption bridge shock insulation support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211228070U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485282A (en) * | 2019-08-29 | 2019-11-22 | 南昌大学 | A kind of column flute profile Self-resetting energy consumption isolation bridge support |
-
2019
- 2019-08-29 CN CN201921417136.7U patent/CN211228070U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485282A (en) * | 2019-08-29 | 2019-11-22 | 南昌大学 | A kind of column flute profile Self-resetting energy consumption isolation bridge support |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108729344B (en) | A kind of two-columned pier construction waving shock insulation use in conjunction | |
| CN105926794B (en) | The assembled mild steel damper optimized using stress isobar | |
| CN202850206U (en) | Friction pendulum support | |
| CN201843071U (en) | Pull rope and stop block combined limiting anti-seismic supporting seat | |
| CN106284212A (en) | A kind of anticollision device, collision-prevention device of bridge pier | |
| CN211228070U (en) | Columnar tooth type self-resetting energy-consumption bridge shock insulation support | |
| CN203247501U (en) | Energy dissipation seismic mitigation and absorption pot bearing | |
| CN112696076B (en) | SMA is from restoring to throne isolation bearing | |
| CN112267371A (en) | Saw-type gear wheel rotation buffering energy-consumption type anti-seismic stop block structure | |
| CN114892509A (en) | Rocking pier based on tumbler principle | |
| CN102400439A (en) | Converter for multifunctional shock absorbing and isolating support | |
| CN211547300U (en) | Three-dimensional gear type self-resetting energy-consumption shock-insulation support | |
| CN107841942B (en) | Hyperboloid friction pendulum support | |
| CN104032670A (en) | Large-corner high-friction shock-absorbing and shock-isolating support | |
| CN204435217U (en) | Girder falling subtracts shock insulation ball shaped steel bearing | |
| CN206665922U (en) | A kind of novel elevator counterweight frame | |
| CN202530572U (en) | High-damping and shock-insulation rubber base provided with limit devices | |
| CN111764268A (en) | Self-resetting support | |
| CN107268427A (en) | A kind of multistage power consumption friction pendulum support of replaceable stopping means | |
| CN204252311U (en) | Vertically punch mild steel damper | |
| CN206157666U (en) | Buffer stop of pier | |
| CN109914635A (en) | A kind of rotation friction energy-dissipating wall | |
| CN213448055U (en) | Replaceable anti-falling beam energy dissipation and shock absorption device suitable for medium-small span beam bridge | |
| CN210194416U (en) | Multi-stage energy-consumption type beam falling prevention device | |
| CN214143251U (en) | Damping energy-consuming beam falling prevention device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200811 Termination date: 20210829 |