CN114962411A - Spherical reticulated shell structure ring groove rivet installation method - Google Patents
Spherical reticulated shell structure ring groove rivet installation method Download PDFInfo
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- CN114962411A CN114962411A CN202210645987.7A CN202210645987A CN114962411A CN 114962411 A CN114962411 A CN 114962411A CN 202210645987 A CN202210645987 A CN 202210645987A CN 114962411 A CN114962411 A CN 114962411A
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- connecting plate
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- rivet
- ring groove
- sleeved
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000009434 installation Methods 0.000 title claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 230000007704 transition Effects 0.000 claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- 238000004881 precipitation hardening Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims 2
- 230000035939 shock Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 239000006096 absorbing agent Substances 0.000 abstract 1
- 241000282414 Homo sapiens Species 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/204—Measuring radiation intensity with scintillation detectors the detector being a liquid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Connection Of Plates (AREA)
Abstract
The invention relates to a method for installing annular groove rivets in a spherical reticulated shell structure, which belongs to the technical field of steel structures and comprises the following operation steps: the first step is as follows: and a node connecting plate is welded between the periphery of the node cylindrical seat and the H-shaped steel supporting beam, and the node connecting plate is welded and fixed with the excircle of the node cylindrical seat. The second step: the inner side of the H-shaped steel supporting beam and the node connecting plate adopt an inner transition connecting plate, the outer side of the H-shaped steel supporting beam and the node connecting plate adopt an outer transition connecting plate, and the node connecting plate is sleeved with the lantern ring in an interference manner through the sleeved ring groove rivet, so that the connecting process of the node connecting plate and the H-shaped steel supporting beam is realized. The third step: the sleeve with the screw connecting shaft is fixedly sleeved with the node cylinder base in a flange mode, the front end of the sleeve is provided with a buffer spring, and the buffer spring is limited and crimped by a pressure plate sleeved with a snap ring. The shock absorber has the characteristics of simple structure, high structural strength, convenience in use, good shock resistance and short period. The problem of how to realize connecting the construction between node and support piece convenient high-efficient is solved.
Description
Technical Field
The invention relates to the technical field of steel structures, in particular to a method for installing annular groove rivets of a spherical reticulated shell structure.
Background
The Jiangmen neutron experiment is further exploration for neutrons by human beings after the neutron experiment in the Bay of the great Asia, and the project is to build a liquid scintillator detector with the effective mass of 2 ten thousand tons, and has important significance for understanding the microscopic basic structure of substances and the origin and evolution of the macroscopic universe by the human beings.
The experimental project of the river neutrino adopts a central detector as a core device, the overall shape of the central detector is spherical, and the central detector is arranged in a water pool with the diameter of about 43.5m and the depth of 44 m.
The stainless steel latticed shell of the central detector comprises a stainless steel latticed shell structure, a supporting structure and a supporting rod. The inner diameter of the stainless steel reticulated shell is 40.1m, and an organic glass ball with the inner diameter of 35.4m is arranged in the stainless steel reticulated shell. The supporting structure mainly comprises three parts, namely a plane truss column, an annular steel beam and a cross-bracing steel beam.
Disclosure of Invention
The invention mainly solves the defects of low structural strength, large assembly workload and long period in the prior art, and provides the method for installing the annular groove rivet of the spherical reticulated shell structure, which has the characteristics of simple structure, high structural strength, convenience in use, good shock resistance and short period. The problem of how to realize connecting the construction between node and support piece convenient high-efficient is solved.
The technical problem of the invention is mainly solved by the following technical scheme:
a spherical reticulated shell structure ring groove rivet installation method comprises the following operation steps:
the first step is as follows: and a node connecting plate is welded between the periphery of the node cylindrical seat and the H-shaped steel supporting beam, and the node connecting plate is welded and fixed with the excircle of the node cylindrical seat.
The second step is that: the inner side of the H-shaped steel supporting beam and the node connecting plate adopt an inner transition connecting plate, the outer side of the H-shaped steel supporting beam and the node connecting plate adopt an outer transition connecting plate, and the annular groove rivet is sleeved on the inner transition connecting plate and is in interference fit with a lantern ring on the end face of the outer transition connecting plate, so that the connection process of the node connecting plate and the H-shaped steel supporting beam is realized.
The third step: the sleeve is sleeved on the screw connecting shaft firstly, then the sleeve with the screw connecting shaft and the node cylinder base are fixed in a flange type sleeved mode, the front end of the sleeve is provided with a buffer spring, and the front end of the screw connecting shaft is in limited compression joint with the buffer spring through a pressure plate sleeved with a snap ring.
Preferably, after the annular groove rivet is sleeved with the lantern ring, the handheld power supply handle is held, the tail of the annular groove rivet is pressed tightly through the riveting gun head, and the control switch is pressed down, so that the driver drives the riveting gun head to drive the riveting process of the annular groove rivet to the lantern ring.
Preferably, the internal thread telescopic rotating shaft in the riveting gun head is in threaded sleeve connection and fixed with the rivet thread head at the front end of the annular rivet, then the external limit telescopic limiting tubular shaft is stretched and then is in compression connection and limited fixation with the lantern ring, and then the internal thread telescopic rotating shaft is contracted to pull the annular rivet, so that the riveting process of the annular rivet and the lantern ring is completed.
Preferably, the rivet thread head and the ring groove rivet polished rod body are of an integrated structure.
Preferably, the driver drives the internal thread telescopic rotating shaft to rotate and fix and is driven by a motor, and the internal thread telescopic rotating shaft and the external limit telescopic limit tubular shaft stretch and retract to perform hydraulic driving and pressure maintaining limiting through a pump station.
Preferably, the annular groove rivet polished rod body of the annular groove rivet clamps and penetrates the inner transition connecting plate and the outer transition connecting plate respectively with the node connecting plate and the H-shaped steel supporting beam and then is in interference sleeve joint with the lantern ring.
Preferably, the circular groove rivet is a round-head stainless steel short-tail rivet with the nominal diameter of 20mm, the riveting thickness range is 45 mm-55 mm, the material is martensite precipitation hardening stainless steel, and the tensile strength is more than 1100 MPa.
Preferably, before the H-shaped steel support beam, the inner transition connecting plate, the outer transition connecting plate and the node connecting plate are assembled, burrs, flashes and welding spatters are removed, dirt on the surface of the connecting plate and in the connecting hole is removed, and the oil stain part is cleaned; the connecting plate surface must be dry, should not operate in the rain, should smooth the wane surface.
The invention can achieve the following effects:
compared with the prior art, the annular groove rivet installation method for the spherical reticulated shell structure has the characteristics of simple structure, high structural strength, convenience in use, good shock resistance and short period. The problem of how to realize connecting the construction between node and support piece convenient high-efficient is solved.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic top view of the present invention.
Fig. 3 is a schematic perspective view of the riveting tool of the present invention.
Fig. 4 is a side view schematic of the riveting tool of the invention.
Fig. 5 is a partial structural cross-sectional view of the present invention.
In the figure: h-shaped steel supporting beam 1, node cylinder seat 2, internal transition connecting plate 3, external transition connecting plate 4, ring groove rivet 5, node connecting plate 6, lantern ring 7, buffer spring 8, pressure disk 9, screw connecting shaft 10, sleeve pipe 11, riveting gun head 12, driver 13, handheld power supply handle 14, control switch 15, internal thread telescopic rotating shaft 16, external limit telescopic limit tubular shaft 17, ring groove rivet polished rod body 18 and rivet thread head 19.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): as shown in fig. 1-5, a method for installing spherical reticulated shell structure ring groove rivets comprises the following operation steps:
the first step is as follows: and a node connecting plate 6 is welded between the periphery of the node cylindrical seat 2 and the H-shaped steel supporting beam 1, and the node connecting plate 6 is welded and fixed with the excircle of the node cylindrical seat 2. Before assembling, removing burrs, fins and welding spatters from the H-shaped steel support beam 1, the inner transition connecting plate 3, the outer transition connecting plate 4 and the node connecting plate 6, removing dirt on the connecting plate surface and in the connecting hole, and cleaning up the oil stain part; the connecting plate surface must be dry, should not operate in the rain, should smooth the wane surface.
The second step is that: the inner side of the H-shaped steel supporting beam 1 and the node connecting plate 6 adopt an inner transition connecting plate 3, the outer side of the H-shaped steel supporting beam 1 and the node connecting plate 6 adopt an outer transition connecting plate 4, the annular groove rivet 5 is sleeved on the inner transition connecting plate 3, the annular groove rivet 5 is sleeved with the lantern ring 7 on the end surface of the outer transition connecting plate 4 in an interference fit manner, and the connecting process of the node connecting plate 6 and the H-shaped steel supporting beam 1 is realized. The ring groove rivet polished rod body 18 of the ring groove rivet 5 clamps the inner transition connecting plate 3 and the outer transition connecting plate 4 with the node connecting plate 6 and the H-shaped steel supporting beam 1 respectively, penetrates through the node connecting plate and then is in interference sleeve joint with the lantern ring 7. The rivet thread head 19 and the ring groove rivet polished rod body 18 are of an integrated structure.
The round-head stainless steel short-tail rivet with the nominal diameter of 20mm is the ring groove rivet 5, the riveting thickness is 50mm, the material is martensite precipitation hardening stainless steel, and the tensile strength is larger than 1100 Mpa.
After the annular groove rivet 5 is sleeved with the lantern ring 7, the handheld power supply handle 14 is held, the tail of the annular groove rivet 5 is pressed tightly through the riveting gun head 12, and the control switch 15 is pressed down, so that the driver 13 drives the riveting gun head 12 to drive the riveting process of the annular groove rivet 5 on the lantern ring 7. An internal thread telescopic rotating shaft 16 in the riveting gun head 12 is in threaded sleeve connection and fixation with a rivet thread head 19 at the front end of the annular rivet 5, then an outer limit telescopic limit tubular shaft 17 is stretched and then is in compression joint and limit fixation with the lantern ring 7, and then the internal thread telescopic rotating shaft 16 contracts to pull the annular rivet 5, so that the riveting process of the annular rivet 5 and the lantern ring 7 is completed.
The driver 13 drives the internal thread telescopic rotating shaft 16 to be rotationally fixed and driven by a motor, and the internal thread telescopic rotating shaft 16 and the external limit telescopic limit tubular shaft 17 are stretched and retracted to perform hydraulic driving and pressure maintaining limiting through a pump station.
The third step: the screw connecting shaft 10 is sleeved with the sleeve 11, then the sleeve 11 with the screw connecting shaft 10 is fixed with the node cylinder base 2 in a flange type sleeved mode, the front end of the sleeve 11 is provided with the buffer spring 8, and the front end of the screw connecting shaft 10 is in limited compression joint with the buffer spring 8 through the pressure plate 9 sleeved with the snap ring.
In conclusion, the method for installing the spherical reticulated shell structure ring groove rivet has the characteristics of simple structure, high structural strength, convenience in use, good shock resistance and short period. The problem of how to realize connecting the construction between node and support piece convenient high-efficient is solved.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (8)
1. A spherical reticulated shell structure ring groove rivet installation method is characterized in that: the method comprises the following operation steps:
the first step is as follows: a node connecting plate (6) is welded between the periphery of the node cylindrical seat (2) and the H-shaped steel supporting beam (1), and the node connecting plate (6) is welded and fixed with the excircle of the node cylindrical seat (2);
the second step is that: the inner side of the H-shaped steel supporting beam (1) and the node connecting plate (6) adopt an inner transition connecting plate (3), the outer side of the H-shaped steel supporting beam (1) and the node connecting plate (6) adopt an outer transition connecting plate (4), a ring groove rivet (5) is sleeved on the inner transition connecting plate (3), the ring groove rivet (5) is sleeved with a lantern ring (7) on the end face of the outer transition connecting plate (4) in an interference manner, and the connecting process of the node connecting plate (6) and the H-shaped steel supporting beam (1) is realized;
the third step: the screw rod connecting shaft (10) is sleeved with the sleeve (11), then the sleeve (11) with the screw rod connecting shaft (10) is fixedly sleeved with the node cylinder seat (2) in a flange mode, the front end of the sleeve (11) is provided with the buffer spring (8), and the front end of the screw rod connecting shaft (10) is connected with the buffer spring (8) in a limiting and pressing mode through the pressing disc (9) sleeved with the clamping ring.
2. The method for installing the spherical reticulated shell structure ring groove rivet according to claim 1, wherein: after the annular rivet (5) is sleeved with the lantern ring (7), the handheld power supply handle (14) is held, the tail of the annular rivet (5) is pressed through the riveting gun head (12), and the control switch (15) is pressed down, so that the driver (13) drives the riveting gun head (12) to drive the riveting process of the annular rivet (5) on the lantern ring (7).
3. The method for installing the spherical reticulated shell structure ring groove rivet according to claim 2, characterized in that: the riveting gun is characterized in that an internal thread telescopic rotating shaft (16) in the riveting gun head (12) is in threaded sleeve connection with a rivet threaded head (19) at the front end of the annular rivet (5) and is fixed, then an outer limiting telescopic limiting tubular shaft (17) is stretched and then is in compression connection with the lantern ring (7) for limiting fixation, and then the internal thread telescopic rotating shaft (16) is contracted to pull the annular rivet (5) to complete the riveting process of the annular rivet (5) and the lantern ring (7).
4. The method for installing the spherical reticulated shell structure ring groove rivet according to claim 3, wherein: the rivet thread head (19) and the ring groove rivet polished rod body (18) are of an integrated structure.
5. The method for installing the spherical reticulated shell structure ring groove rivet according to claim 3, wherein: the driver (13) drives the internal thread telescopic rotating shaft (16) to be rotationally fixed and driven by a motor, and the internal thread telescopic rotating shaft (16) and the external limit telescopic limit tubular shaft (17) are stretched and retracted to carry out hydraulic driving and pressure maintaining limiting through a pump station.
6. The method for installing the spherical reticulated shell structure ring groove rivet according to claim 1, wherein: the ring groove rivet polished rod body (18) of the ring groove rivet (5) clamps the inner transition connecting plate (3) and the outer transition connecting plate (4) with the node connecting plate (6) and the H-shaped steel supporting beam (1) respectively and penetrates through the node connecting plate and the H-shaped steel supporting beam to be sleeved with the lantern ring (7) in an interference manner.
7. The method for installing the spherical reticulated shell structure ring groove rivet according to claim 1, wherein: the round-head stainless steel short-tail rivet with the nominal diameter of 20mm of the ring groove rivet (5) has the riveting thickness range of 45-55 mm, is made of martensite precipitation hardening stainless steel, and has the tensile strength of more than 1100 Mpa.
8. The method for installing the spherical reticulated shell structure ring groove rivet according to claim 1, wherein: before assembling, removing burrs, flashes and welding splashes from the H-shaped steel support beam (1), the inner transition connecting plate (3), the outer transition connecting plate (4) and the node connecting plate (6), removing dirt on the connecting plate surface and in the connecting hole, and cleaning up the oil dirt-stained part; the connecting plate surface must be dry, should not operate in the rain, should smooth the wane surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210645987.7A CN114962411A (en) | 2022-06-09 | 2022-06-09 | Spherical reticulated shell structure ring groove rivet installation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210645987.7A CN114962411A (en) | 2022-06-09 | 2022-06-09 | Spherical reticulated shell structure ring groove rivet installation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114962411A true CN114962411A (en) | 2022-08-30 |
Family
ID=82971108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210645987.7A Withdrawn CN114962411A (en) | 2022-06-09 | 2022-06-09 | Spherical reticulated shell structure ring groove rivet installation method |
Country Status (1)
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| CN (1) | CN114962411A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120126424A (en) * | 2011-05-11 | 2012-11-21 | 고려대학교 산학협력단 | Single Layer Free Form Node |
| CN203878780U (en) * | 2014-06-05 | 2014-10-15 | 杨红燕 | Connecting joint of cylindrical rib penetrating type steel pipe concrete column and steel beam |
| CN105926780A (en) * | 2016-07-01 | 2016-09-07 | 山东科技大学 | Beam-column node of double-round steel pipe concrete column and construction method |
| CN106677342A (en) * | 2017-02-17 | 2017-05-17 | 北京工业大学 | Assembly type corrugated web occlusion beam-column joint connection device capable of recovering function |
| US20180038404A1 (en) * | 2016-08-08 | 2018-02-08 | Meishan Crrc Fastening System Co., Ltd. | Single-groove and Short-tail Pulling Rivet and Erection Method Thereof |
| CN108118783A (en) * | 2017-12-28 | 2018-06-05 | 清华大学 | A kind of connecting node of steel core concrete column and girder steel |
| CN110093981A (en) * | 2019-04-18 | 2019-08-06 | 清华大学 | The semi-rigid bean column node of aluminium alloy of ring-grooved rivet connection |
| CN110565803A (en) * | 2019-09-12 | 2019-12-13 | 北京工业大学 | Cylindrical node for connecting webs of H-shaped rod piece |
| CN111236427A (en) * | 2020-01-08 | 2020-06-05 | 中国科学院高能物理研究所 | Stainless steel structure node connection method and double-clamping-plate connection structure |
| CN111733986A (en) * | 2020-07-13 | 2020-10-02 | 青岛理工大学 | Double-steel-pipe concrete beam column node with built-in FRP (fiber reinforced plastic) rib connecting device and installation method |
| CN111877561A (en) * | 2020-06-02 | 2020-11-03 | 东南大学 | Ring gear tooth groove type aluminum alloy combined node |
| CN113047454A (en) * | 2021-04-07 | 2021-06-29 | 青岛理工大学 | FRP (fiber reinforced plastic) steel concrete column and steel beam combined node and mounting method |
| CN113618326A (en) * | 2021-08-09 | 2021-11-09 | 浙江东南网架股份有限公司 | Spatial positioning tool for cylindrical low-background stainless steel node and operation method thereof |
-
2022
- 2022-06-09 CN CN202210645987.7A patent/CN114962411A/en not_active Withdrawn
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120126424A (en) * | 2011-05-11 | 2012-11-21 | 고려대학교 산학협력단 | Single Layer Free Form Node |
| CN203878780U (en) * | 2014-06-05 | 2014-10-15 | 杨红燕 | Connecting joint of cylindrical rib penetrating type steel pipe concrete column and steel beam |
| CN105926780A (en) * | 2016-07-01 | 2016-09-07 | 山东科技大学 | Beam-column node of double-round steel pipe concrete column and construction method |
| US20180038404A1 (en) * | 2016-08-08 | 2018-02-08 | Meishan Crrc Fastening System Co., Ltd. | Single-groove and Short-tail Pulling Rivet and Erection Method Thereof |
| CN106677342A (en) * | 2017-02-17 | 2017-05-17 | 北京工业大学 | Assembly type corrugated web occlusion beam-column joint connection device capable of recovering function |
| CN108118783A (en) * | 2017-12-28 | 2018-06-05 | 清华大学 | A kind of connecting node of steel core concrete column and girder steel |
| CN110093981A (en) * | 2019-04-18 | 2019-08-06 | 清华大学 | The semi-rigid bean column node of aluminium alloy of ring-grooved rivet connection |
| CN110565803A (en) * | 2019-09-12 | 2019-12-13 | 北京工业大学 | Cylindrical node for connecting webs of H-shaped rod piece |
| CN111236427A (en) * | 2020-01-08 | 2020-06-05 | 中国科学院高能物理研究所 | Stainless steel structure node connection method and double-clamping-plate connection structure |
| CN111877561A (en) * | 2020-06-02 | 2020-11-03 | 东南大学 | Ring gear tooth groove type aluminum alloy combined node |
| CN111733986A (en) * | 2020-07-13 | 2020-10-02 | 青岛理工大学 | Double-steel-pipe concrete beam column node with built-in FRP (fiber reinforced plastic) rib connecting device and installation method |
| CN113047454A (en) * | 2021-04-07 | 2021-06-29 | 青岛理工大学 | FRP (fiber reinforced plastic) steel concrete column and steel beam combined node and mounting method |
| CN113618326A (en) * | 2021-08-09 | 2021-11-09 | 浙江东南网架股份有限公司 | Spatial positioning tool for cylindrical low-background stainless steel node and operation method thereof |
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Application publication date: 20220830 |
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