CN109340239B - Detachable antitheft bolt assembly for transmission line iron tower - Google Patents
Detachable antitheft bolt assembly for transmission line iron tower Download PDFInfo
- Publication number
- CN109340239B CN109340239B CN201811483779.1A CN201811483779A CN109340239B CN 109340239 B CN109340239 B CN 109340239B CN 201811483779 A CN201811483779 A CN 201811483779A CN 109340239 B CN109340239 B CN 109340239B
- Authority
- CN
- China
- Prior art keywords
- nut
- limiting block
- bolt
- adjusting block
- clamping
- 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.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 24
- 229910052742 iron Inorganic materials 0.000 title claims description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
-
- 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
- F16B37/00—Nuts or like thread-engaging members
-
- 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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
-
- 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
- F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
- F16B41/005—Measures against unauthorised operation of bolts, nuts or pins
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
The invention relates to the technical field of anti-theft bolts for transmission line towers, in particular to a detachable anti-theft bolt assembly for a transmission line tower. The device comprises a bolt, a first nut, a second nut, an adjusting block, a limiting block, a homing spring plate and a special spanner; the second nut is buckled on the first nut through the convex clamping groove; the adjusting block and the limiting block are arranged in the cavity through the rotating shaft, the adjusting block is pressed on the limiting block, and the limiting block is pressed on the homing elastic sheet; tooth-shaped clamping grooves are uniformly distributed on a screw rod of the bolt, clamping pins corresponding to the clamping grooves are arranged on the limiting block, and the limiting block is clamped into the clamping grooves through the clamping pins to lock the bolt; the adjusting block is provided with a special-shaped groove, the special spanner is provided with a spanner head corresponding to the special-shaped groove, the spanner head is inserted into the special-shaped groove to drive the adjusting block to rotate around the rotating shaft, and further the limiting block is driven to rotate, so that the bayonet lock is separated from the clamping groove, and the bolt lock is released. The anti-theft and anti-loosening bolt has the anti-theft and anti-loosening functions, the bolt can be disassembled without damaging the bolt, the overhaul operation efficiency is improved, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of anti-theft bolts for transmission line towers, in particular to a detachable anti-theft bolt assembly for a transmission line tower.
Background
The transmission line iron tower is a tower-shaped building for transmission. The tower type steel plate heat-insulating steel plate is structurally characterized in that various tower type steel plates belong to a space truss structure, rod pieces are mainly composed of single equilateral angle steel or combined angle steel, Q235 (A3F) and Q345 (16 Mn) are generally used as materials, crude bolts are adopted for connection among the rod pieces, the rods are connected by shear force through the bolts, the whole tower is composed of the angle steel, connecting steel plates and bolts, and individual components such as tower legs are welded into a combined piece through a plurality of steel plates, so that hot galvanizing corrosion prevention, transportation and construction erection are extremely convenient.
In recent years, the phenomenon of electric power facilities being stolen is serious, and particularly, steel of iron towers is more rampant, while the theft is mainly implemented by detaching equipment bolts to separate equipment from a base, and the iron towers can be effectively prevented from being stolen by adopting the anti-theft bolts. The existing anti-theft bolt is easy to loosen and cannot be disassembled, if the bolt is required to be disassembled during maintenance, the bolt can only be damaged by external force, so that the operation time is greatly prolonged, and the maintenance cost is increased.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a detachable anti-theft bolt assembly for a transmission line iron tower. The anti-theft anti-loosening bolt has anti-theft and anti-loosening functions, and can be disassembled without damaging the bolt during overhauling, so that the overhauling operation efficiency is improved, and the overhauling cost is reduced.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a detachable anti-theft bolt component comprises a bolt, a first nut, a second nut, an adjusting block, a limiting block, a homing spring plate and a special spanner; the first nut and the second nut are sequentially arranged on the bolt, the end face of the first nut is provided with a groove, the end face of the second nut is provided with a corresponding protrusion, and the second nut is buckled on the first nut through the protrusion clamping groove;
the first nut is provided with a cavity, the adjusting block, the limiting block and the homing spring plate are positioned in the cavity, the adjusting block and the limiting block are arranged in the cavity through a rotating shaft, the adjusting block is pressed on the limiting block, and the limiting block is pressed on the homing spring plate; tooth-shaped clamping grooves are uniformly distributed on a screw rod of the bolt, clamping pins corresponding to the clamping grooves are arranged on the limiting block, and the limiting block is clamped into the clamping grooves through the clamping pins to lock the bolt; the adjusting block is provided with a special-shaped groove, the special spanner is provided with a spanner head corresponding to the special-shaped groove, the spanner head is inserted into the special-shaped groove to drive the adjusting block to rotate around the rotating shaft, and further the limiting block is driven to rotate, so that the bayonet lock is separated from the clamping groove, and the bolt lock is released.
The first nut is a regular hexagon nut, an internal thread corresponding to the screw rod is arranged in the center of the first nut, a cavity is arranged at the bottom of the first nut, and the cavity is communicated with the internal thread through a rectangular groove.
The first nut end face is provided with a plurality of triangular grooves, the second nut end face is provided with corresponding triangular protrusions, and the second nut is buckled on the first nut through the protrusions clamped into the grooves.
Triangle tooth-shaped draw-in groove is evenly distributed on the lead screw of bolt, is equipped with the triangle-shaped bayonet lock corresponding with the draw-in groove on the stopper, and the stopper is blocked the draw-in groove through the bayonet lock and is locked the bolt.
One end of the adjusting block is provided with a rotating shaft, the adjusting block is arranged in the first nut cavity through the rotating shaft, the other end of the adjusting block is provided with a straight-line shaped special-shaped groove, and the middle part of the adjusting block is provided with a pressing plate.
One end of the limiting block is provided with a rotating shaft, the adjusting block is arranged in the first nut cavity through the rotating shaft, the other end of the limiting block is provided with a pressing table, and the middle of the limiting block is provided with a triangular bayonet lock.
The homing spring sheet is a triangular spring sheet.
Compared with the prior art, the invention has the beneficial effects that:
1) Tooth-shaped clamping grooves are uniformly distributed on a screw rod of the bolt, clamping pins corresponding to the clamping grooves are arranged on the limiting block, and the limiting block is clamped into the clamping grooves through the clamping pins to lock the bolt; the anti-theft device has an anti-theft function, so that bolts are prevented from being detached from equipment by common tools, and the transmission line iron tower is prevented from being stolen; meanwhile, the anti-loosening device has an anti-loosening function and prevents the bolt from loosening.
2) The adjusting block is provided with the special-shaped groove, the spanner is provided with the spanner head corresponding to the special-shaped groove, the spanner head is inserted into the special-shaped groove to drive the adjusting block to rotate around the rotating shaft, and then the limiting block is driven to rotate, so that the clamping pin is separated from the clamping groove, the bolt lock is released, the bolt can be detached, the bolt cannot be damaged, the overhaul operation efficiency is improved, and the overhaul cost is reduced.
3) The adjusting block and the limiting block are arranged in the cavity through the rotating shaft, the adjusting block is pressed on the limiting block, and the limiting block is pressed on the homing elastic sheet; the clamping pin can be clamped into the clamping groove again through the elastic force of the homing elastic sheet, the installation and the disassembly are convenient and quick, and the overhaul operation efficiency is improved.
Drawings
FIG. 1 is a schematic perspective view of the present invention (excluding a special wrench);
FIG. 2 is a schematic perspective view of another angle of the present invention (excluding the special wrench and the second nut);
FIG. 3 is a schematic perspective view of a bolt according to the present invention;
FIG. 4 is a schematic perspective view of a first nut of the present invention;
FIG. 5 is a schematic perspective view of a second nut of the present invention;
FIG. 6 is a schematic perspective view of an adjustment block of the present invention;
FIG. 7 is a schematic view of a three-dimensional structure of a stopper according to the present invention;
FIG. 8 is a schematic diagram of the installation of the adjusting block, the limiting block and the homing spring plate of the present invention;
fig. 9 is a schematic perspective view of a special wrench according to the present invention.
In the figure: 1-a bolt 2-a first nut 3-a second nut 4-an adjusting block 5-a limiting block 6-a homing spring 7-a special spanner 11-a triangle tooth-shaped clamping groove 12-a screw rod 21-a cavity 22-an internal thread 23-a rectangular groove 24-a triangle groove 31-a triangle bulge 41-an adjusting block rotating shaft 42-a linear special-shaped groove 43-a pressing plate 51-a pressing table 52-a triangle clamping pin 53-a rotating shaft 71-a spanner head
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in fig. 1 and 2, a detachable anti-theft bolt assembly comprises a bolt 1, a first nut 2, a second nut 3, an adjusting block 4, a limiting block 5, a homing spring plate 6 and a special spanner 7.
As shown in fig. 3, the bolt 1 is a hexagonal bolt, and 6 triangular tooth-shaped clamping grooves 11 are uniformly distributed on the circumference of a screw shaft 12 of the bolt 1.
As shown in fig. 4, the first nut 2 is a regular hexagonal nut, the center of which is provided with an internal thread 22 corresponding to the lead screw 12, the bottom of which is provided with a cavity 21, and the cavity 21 is communicated with the internal thread 22 through a rectangular groove 23. The end face of the first nut 2 is provided with 4 triangular grooves 24,4 triangular grooves 24 which are uniformly distributed above the cavity 21.
As shown in fig. 5, the end surface of the second nut 3 is provided with triangular protrusions 31 corresponding to the triangular grooves 24 of the first nut 2, and the second nut 3 is buckled on the first nut 2 by the triangular protrusions 31 being clamped into the triangular grooves 24 of the first nut 2.
As shown in fig. 6, one end of the adjusting block 4 is provided with an adjusting block rotating shaft 41, the adjusting block 4 is arranged in the cavity 21 of the first nut 2 through the adjusting block rotating shaft 41, and the adjusting block 4 can rotate around the adjusting block rotating shaft 41; the other end of the adjusting block 4 is provided with a straight-line shaped special-shaped groove 42. The middle part of the adjusting block 4 is provided with a pressing plate 43.
As shown in fig. 7, one end of the limiting block 5 is provided with a rotating shaft 53, the limiting block 5 is installed in the cavity 21 of the first nut 2 through the rotating shaft 53, and the limiting block 5 can rotate around the rotating shaft 53. The other end of the limiting block 5 is provided with a pressing table 51, and the middle part of the limiting block is provided with a triangular bayonet lock 52.
As shown in fig. 1, 2 and 8, the first nut 2 and the second nut 3 are sequentially mounted on the bolt 1, and the second nut 3 is locked on the first nut 2 by the triangular protrusion 31 of the second nut and the triangular groove 24 of the first nut 2. The homing spring 6 is a triangular spring, and the section of the homing spring is triangular.
The adjusting block 4, the limiting block 5 and the homing spring plate 6 are positioned in the cavity 21 of the first nut 2. The adjusting block 4 is mounted in the cavity 21 of the first nut 2 through an adjusting block rotating shaft 41, and the adjusting block 4 can rotate around the adjusting block rotating shaft 41. The limiting block 5 is arranged in the cavity 21 of the first nut 2 through a rotating shaft 53, and the limiting block 5 can rotate around the rotating shaft 53. The pressing plate 43 of the adjusting block 4 is pressed on the pressing table 54 of the limiting block 5, and the pressing table 54 is pressed on the homing spring plate 6.
The limiting block 5 is clamped into the triangular tooth-shaped clamping groove 11 of the bolt 1 through the triangular clamping pin 52, the bolt 1 is locked, and the limiting block 5 can only be driven to rotate through the special spanner 7 to unlock the bolt 1. The anti-theft bolt has an anti-theft function, so that the bolt 1 is prevented from being detached from equipment by a common tool, and the transmission line iron tower is prevented from being stolen; meanwhile, the anti-loosening device has an anti-loosening function and prevents the bolt from loosening.
The adjusting block 4 is provided with a linear special-shaped groove 42, as shown in fig. 9, the special wrench 7 is provided with a wrench head 71 corresponding to the linear special-shaped groove 42, and the wrench head 71 is inserted into the linear special-shaped groove 42 to drive the adjusting block 4 to rotate around the adjusting block rotating shaft 41, so that the limiting block 5 is driven to rotate, the triangular bayonet lock 52 is separated from the triangular toothed bayonet lock groove 11, and the locking of the bolt 1 is released. The bolt 1 can be detached from the equipment, the bolt 1 is not damaged, the overhaul operation efficiency is improved, and the overhaul cost is reduced.
The triangular bayonet lock 52 can be clamped into the triangular tooth-shaped clamping groove 11 again through the elastic force of the homing elastic sheet 6, so that the installation and the disassembly are convenient and quick, and the maintenance operation efficiency is improved.
The invention has the functions of theft prevention and anti-loose, and the bolt 1 can be disassembled without damaging the bolt 1 during maintenance, thereby improving the maintenance operation efficiency and reducing the maintenance cost.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The detachable antitheft bolt assembly for the transmission line iron tower is characterized by comprising a bolt, a first nut, a second nut, an adjusting block, a limiting block, a homing spring plate and a special spanner; the first nut and the second nut are sequentially arranged on the bolt, the end face of the first nut is provided with a groove, the end face of the second nut is provided with a corresponding protrusion, and the second nut is buckled on the first nut through the protrusion clamping groove;
the first nut is provided with a cavity, the adjusting block, the limiting block and the homing spring plate are positioned in the cavity, the adjusting block and the limiting block are arranged in the cavity through a rotating shaft, the adjusting block is pressed on the limiting block, and the limiting block is pressed on the homing spring plate; tooth-shaped clamping grooves are uniformly distributed on a screw rod of the bolt, clamping pins corresponding to the clamping grooves are arranged on the limiting block, and the limiting block is clamped into the clamping grooves through the clamping pins to lock the bolt; the adjusting block is provided with a special-shaped groove, the spanner is provided with a spanner head corresponding to the special-shaped groove, the spanner head is inserted into the special-shaped groove to drive the adjusting block to rotate around the rotating shaft, and further the limiting block is driven to rotate, so that the bayonet lock is separated from the clamping groove, and the bolt lock is released;
the first nut is a regular hexagon nut, the center of the first nut is provided with an internal thread corresponding to the screw rod, the bottom of the first nut is provided with a cavity, and the cavity is communicated with the internal thread through a rectangular groove;
one end of the adjusting block is provided with an adjusting block rotating shaft, the adjusting block is arranged in the first nut cavity through the adjusting block rotating shaft, the other end of the adjusting block is provided with a straight-line shaped special-shaped groove, and the middle part of the adjusting block is provided with a pressing plate.
2. The detachable antitheft bolt assembly for the transmission line iron tower according to claim 1, wherein the first nut end face is provided with a plurality of triangular grooves, the second nut end face is provided with corresponding triangular protrusions, and the second nut is buckled on the first nut through the protrusion clamping grooves.
3. The detachable antitheft bolt assembly for the transmission line iron tower according to claim 1, wherein triangular tooth-shaped clamping grooves are uniformly distributed on a screw rod of the bolt, triangular clamping pins corresponding to the clamping grooves are arranged on the limiting block, and the limiting block locks the bolt through clamping the clamping pins into the clamping grooves.
4. The detachable antitheft bolt assembly for the transmission line iron tower according to claim 1, wherein one end of the limiting block is provided with a rotating shaft, the limiting block is installed in the first nut cavity through the rotating shaft, the other end of the limiting block is provided with a pressing table, and the middle of the limiting block is provided with a triangular bayonet lock.
5. The removable anti-theft bolt assembly for a power transmission line pylon according to claim 1, wherein the homing spring is a triangular spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811483779.1A CN109340239B (en) | 2018-12-06 | 2018-12-06 | Detachable antitheft bolt assembly for transmission line iron tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811483779.1A CN109340239B (en) | 2018-12-06 | 2018-12-06 | Detachable antitheft bolt assembly for transmission line iron tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109340239A CN109340239A (en) | 2019-02-15 |
| CN109340239B true CN109340239B (en) | 2023-08-15 |
Family
ID=65297554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811483779.1A Active CN109340239B (en) | 2018-12-06 | 2018-12-06 | Detachable antitheft bolt assembly for transmission line iron tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109340239B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112449522A (en) * | 2019-09-05 | 2021-03-05 | 英业达科技有限公司 | Fixing frame |
| WO2022051993A1 (en) * | 2020-09-10 | 2022-03-17 | 海能达通信股份有限公司 | Nut assembly, connection mechanism and disassembly element |
| CN115387610B (en) * | 2022-09-20 | 2023-06-16 | 中建八局第一建设有限公司 | Connection structure for ultrahigh formwork transformation construction and construction method |
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| CN1067297A (en) * | 1991-02-15 | 1992-12-23 | 保罗·爱德华·尤因 | Self-locking fastener |
| JPH11270542A (en) * | 1998-03-19 | 1999-10-05 | Asahi Electric Works Ltd | Loosening preventive structure of tightening bolt and nut |
| JP2000039012A (en) * | 1998-07-23 | 2000-02-08 | Sanko Kk | Play preventing apparatus for bolt nut |
| JP2000046032A (en) * | 1998-07-31 | 2000-02-15 | Nichido Denko Kk | Nut turn stopping structure |
| CN2429679Y (en) * | 1999-10-11 | 2001-05-09 | 张佩师 | Cup-shaped security loosen-proof screw assembly |
| JP3395780B1 (en) * | 2002-03-04 | 2003-04-14 | 博信 黒田 | Anti-mischief fastening parts and fastening structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8136428B2 (en) * | 2008-02-15 | 2012-03-20 | Bryan Engelbrecht | Non-reversible fastener |
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| FR769774A (en) * | 1934-03-07 | 1934-09-01 | Self-locking bolt system | |
| CN1067297A (en) * | 1991-02-15 | 1992-12-23 | 保罗·爱德华·尤因 | Self-locking fastener |
| JPH11270542A (en) * | 1998-03-19 | 1999-10-05 | Asahi Electric Works Ltd | Loosening preventive structure of tightening bolt and nut |
| JP2000039012A (en) * | 1998-07-23 | 2000-02-08 | Sanko Kk | Play preventing apparatus for bolt nut |
| JP2000046032A (en) * | 1998-07-31 | 2000-02-15 | Nichido Denko Kk | Nut turn stopping structure |
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| CN106438650A (en) * | 2016-11-03 | 2017-02-22 | 贺湘钧 | Bolt set with anti-loosening function |
| CN107269665A (en) * | 2017-08-08 | 2017-10-20 | 张亚宁 | Super fastening kit |
| DE202018104491U1 (en) * | 2018-08-03 | 2018-09-06 | Serhat Kocak | Fastening device, in particular for stable, verschwenksicheren attachment of a clamping bolt |
| CN209309093U (en) * | 2018-12-06 | 2019-08-27 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of dismountable anti-theft bolt component for iron tower of power transmission line |
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| 徐永生 ; .锁紧螺栓螺母.机械制造.1985,(第11期),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109340239A (en) | 2019-02-15 |
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