CN114542577A - High-strength type curved bar anti-loosening fastener - Google Patents
High-strength type curved bar anti-loosening fastener Download PDFInfo
- Publication number
- CN114542577A CN114542577A CN202210185337.9A CN202210185337A CN114542577A CN 114542577 A CN114542577 A CN 114542577A CN 202210185337 A CN202210185337 A CN 202210185337A CN 114542577 A CN114542577 A CN 114542577A
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- Prior art keywords
- loosening
- fastening
- rope
- blind hole
- locking
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Links
- 230000000149 penetrating effect Effects 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 9
- 238000010276 construction Methods 0.000 abstract description 7
- 238000009412 basement excavation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- KJLPSBMDOIVXSN-UHFFFAOYSA-N 4-[4-[2-[4-(3,4-dicarboxyphenoxy)phenyl]propan-2-yl]phenoxy]phthalic acid Chemical compound C=1C=C(OC=2C=C(C(C(O)=O)=CC=2)C(O)=O)C=CC=1C(C)(C)C(C=C1)=CC=C1OC1=CC=C(C(O)=O)C(C(O)=O)=C1 KJLPSBMDOIVXSN-UHFFFAOYSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- 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
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- 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
- 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
- F16B39/20—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of steel wire or the like
Abstract
The invention discloses a high-strength type bent rod anti-loose fastener, which comprises a fastener body, an anti-loose assembly and a locking assembly, wherein the fastener body comprises a fastening bolt and a fastening nut, the fastening bolt comprises a fastening screw rod and a fastening screw head, the fastening screw rod is in an arc shape, one end of the fastening screw rod is fixed with the fastening screw head, the other end of the fastening screw rod is in threaded connection with the fastening nut, a blind hole is arranged at the end surface of one end of the fastening screw rod with the fastening nut, the anti-loose assembly comprises an anti-loose spring and a rope body, the anti-loose spring is positioned in the blind hole, one end of the anti-loose spring is connected with the top end surface of the blind hole, the other end of the anti-loose spring is connected with one end of the rope body, the other end of the rope body is connected with the locking assembly after penetrating out of the blind hole, the locking assembly can not extend into the blind hole, and the anti-loose spring can be used for continuously giving elasticity to the fastening nut, which is close to the fastening screw head of the fastening bolt after the assembly is completed, effectively prevent fastening nut because of vibrations progressively unscrew, and then guarantee the security of building site construction.
Description
[ technical field ] A
The invention relates to the technical field of fasteners, in particular to the technical field of high-strength bent-rod anti-loose fasteners.
[ background ] A method for producing a semiconductor device
The shield machine is a tunnel boring machine using a shield method and has the functions of excavating and cutting soil bodies, conveying soil slag, assembling tunnel linings and the like. When the shield machine is used for lining a tunnel, a plurality of segments can be spliced into a cylindrical pipeline as a wall body by using a fastener, so that the ground settlement is effectively controlled during the excavation, the influence on ground buildings is reduced, and the water traffic is not influenced during the underwater excavation. The locking effect of fastener is not good for current section of jurisdiction is assembled, during later stage is excavated, appears the problem of pine and take off because of reasons such as vibrations easily, and then produces the potential safety hazard, awaits a urgent need to solve.
[ summary of the invention ]
The invention aims to solve the problems in the prior art, and provides a high-strength bent-rod anti-loose fastener which can continuously give the elastic force close to a fastening screw head of a fastening bolt to a fastening nut by using an anti-loose spring after assembly is completed, so that the fastening nut is effectively prevented from being gradually unscrewed due to vibration, and the safety of construction in a construction site is further ensured.
In order to achieve the purpose, the invention provides a high-strength type bent rod anti-loose fastener which comprises a fastener body, an anti-loose assembly and a locking assembly, wherein the fastener body comprises a fastening bolt and a fastening nut, the fastening bolt comprises a fastening screw rod and a fastening screw head, the fastening screw rod is in an arc shape, one end of the fastening screw rod is fixed with the fastening screw head, the other end of the fastening screw rod is in threaded connection with the fastening nut, a blind hole is formed in the end face of the fastening screw rod with the fastening nut, the anti-loose assembly comprises an anti-loose spring and a rope body, the anti-loose spring is located in the blind hole, one end of the anti-loose spring is connected with the top end face of the blind hole, the other end of the anti-loose spring is connected with one end of the rope body, the other end of the rope body is connected with the locking assembly after penetrating out of the blind hole, and the locking assembly cannot stretch into the blind hole.
Preferably, the fastening nut is provided with a plurality of parent rope holes around the central screw hole, and the other end of the rope body penetrates through the blind holes and then sequentially penetrates through the parent rope holes.
Preferably, the anti-loosening assembly further comprises an anti-loosening bolt and a bolt seat, a screw hole penetrating through the blind hole is formed in the fastening screw head, the anti-loosening bolt comprises an anti-loosening screw rod and an anti-loosening screw head, one end of the anti-loosening screw rod is fixed to the anti-loosening screw head, the other end of the anti-loosening screw rod is rotatably connected with the bolt seat in the blind hole after the screw thread penetrates through the screw hole, and the bolt seat is fixed to one end of the rope body.
Preferably, the locking assembly includes a housing, a plug and a locking spring, the housing is in a cylindrical shape with one end closed by a sealing plate and forms a cylindrical passage with an opening, two cylindrical rope holes penetrating the cylindrical passage are oppositely arranged on a wall of the housing, the plug includes a lug, a link rod and a pressing plate, two ends of the link rod are respectively connected with the lug and the pressing plate, one end of the link rod with the lug extends into the cylindrical passage, the lug is provided with a block rope hole, the block rope hole can be aligned or misaligned with the two cylindrical rope holes during the sliding of the lug along the cylindrical passage, the locking spring is positioned in the cylindrical passage, two ends of the locking spring are respectively connected with the sealing plate and the lug, and the locking spring has an elastic tendency of driving the lug to slide until the rope hole is not aligned with the two cylindrical rope holes.
Preferably, the two barrel cord holes are both located adjacent the closure plate, and the locking spring has an elastic tendency to elongate thereby urging the lug away from the closure plate.
Preferably, the locking assembly further comprises a locking ring, the tie rod being threadedly connected to the locking ring.
Preferably, the block rope hole and the two cylinder rope holes are respectively provided with rough lines on the hole walls.
Preferably, the locking assembly is magnetically attracted to the bottom end of the fastening screw or to the outside of the fastening nut.
The invention has the beneficial effects that: according to the invention, the anti-loosening assembly is formed by arranging the anti-loosening spring and the rope body, is arranged in the blind hole of the fastening screw of the fastening bolt and can be matched with the locking assembly, and the anti-loosening spring is utilized to continuously give the fastening nut the elastic force close to the fastening screw head of the fastening bolt after the assembly is finished, so that the fastening nut is effectively prevented from being gradually unscrewed due to vibration, and the safety of construction in a construction site is further ensured; by additionally arranging the anti-loosening bolt and the bolt seat, the bolt seat can be driven to gradually approach or be far away from the fastening screw head of the fastening bolt by utilizing the rotation of the anti-loosening bolt, the stretching length of the anti-loosening spring is accurately adjusted, and the elasticity of the fastening nut pulled by the anti-loosening spring is further controlled; the plurality of parent body rope holes are arranged outside the central screw hole of the fastening nut in a surrounding manner, so that the stability of the fastening nut pulled by the rope body is effectively enhanced; the locking assembly is formed by arranging the shell, the plug and the locking spring, and the locking spring can be used for forcing the rope hole of the barrel body and the rope hole to be staggered, so that the free end of the rope body is fixed; through additionally arranging the locking ring in threaded connection with the link rod, the depth of the lug which can extend into the channel of the barrel is adjusted, the phenomenon that the rope hole of the barrel and the rope hole coincide with each other again after locking is completed is avoided, and then the free end of the rope body is prevented from automatically falling off.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a front view of a high strength type curved bar check fastener of the present invention;
FIG. 2 is a front cross-sectional view of the fastener body of a high strength swage lockdown fastener of this invention;
FIG. 3 is an assembled schematic view of a locking assembly and a locking assembly of a high strength curved bar check fastener of the present invention;
FIG. 4 is a schematic view of the assembly of the nut and the rope of the high-strength type curved bar anti-loose fastener of the present invention;
FIG. 5 is a schematic view of a locking assembly of a high-strength curved bar check fastener of the present invention in a first operating condition;
FIG. 6 is a schematic view of a locking assembly of a high-strength curved bar check fastener of the present invention in a second operational state;
fig. 7 is a third operational state diagram of the locking assembly of the high-strength type curved bar check fastener of the present invention.
In the figure: 1-fastener body, 11-fastening bolt, 111-fastening screw, 112-fastening screw head, 113-blind hole, 114-screw hole, 12-fastening nut, 121-parent rope hole, 2-anti-loose component, 21-anti-loose spring, 22-rope body, 23-anti-loose bolt, 24-bolt seat, 3-locking component, 31-shell, 311-cylinder rope hole, 32-plug, 321-lug, 3211-rope hole, 322-link rod, 323-pressing plate, 324-locking ring and 33-locking spring.
[ detailed description ] embodiments
Referring to fig. 1 to 7, the invention relates to a high-strength curved bar anti-loose fastener, comprising a fastener body 1, an anti-loose assembly 2 and a locking assembly 3, the fastener body 1 comprises a fastening bolt 11 and a fastening nut 12, the fastening bolt 11 comprises a fastening screw 111 and a fastening screw head 112, the fastening screw 111 is arc-shaped, one end of the fastening screw is fixed with the fastening screw head 112, the other end of the fastening screw is in threaded connection with the fastening nut 12, a blind hole 113 is arranged at one end face of the fastening screw 111 with the fastening nut 12, the anti-loosening assembly 2 comprises an anti-loosening spring 21 and a rope body 22, the anti-loosening spring 21 is positioned in the blind hole 113, one end of the anti-loosening spring 21 is connected with the top end face of the blind hole 113, the other end of the anti-loosening spring is connected with one end of the rope body 22, the other end of the rope body 22 is connected with the locking component 3 after penetrating out of the blind hole 113, and the locking component 3 can not extend into the blind hole 113.
The fastening nut 12 is provided with a plurality of parent rope holes 121 around the central screw hole, and the other end of the rope body 22 passes through the parent rope holes after passing through the blind hole 113.
The anti-loosening assembly 2 further comprises an anti-loosening bolt 23 and a bolt seat 24, a screw hole 114 penetrating through the blind hole 113 is formed in the fastening screw head 112, the anti-loosening bolt 23 comprises an anti-loosening screw rod and an anti-loosening screw head, one end of the anti-loosening screw rod is fixed with the anti-loosening screw head, the other end of the anti-loosening screw rod is rotatably connected with the bolt seat 24 located in the blind hole 113 after the screw thread penetrates through the screw hole 114, and the bolt seat 24 is fixed with one end of the rope body 22.
The locking assembly 3 comprises a shell 31, a plug 32 and a locking spring 33, wherein the shell 31 is in a cylindrical shape with one end closed by a sealing plate and forms a cylindrical passage with an opening, two cylinder rope holes 311 which run through the cylinder passage are oppositely arranged on the shell wall of the shell 31, the plug 32 comprises a projection 321, a link rod 322 and a pressing plate 323, two ends of the link rod 322 are respectively connected with the projection 321 and the pressing plate 323, one end of the link rod 322 with a projection 321 extends into the barrel channel, the projection 321 is provided with a block rope hole 3211, the block cord holes 3211 may be aligned or misaligned with the two barrel cord holes 311 during the sliding of the tab 321 along the barrel channel, the locking spring 33 is located in the barrel channel and has two ends respectively connected with the sealing plate and the projection 321, the locking spring 33 has an elastic tendency to drive the protrusion 321 to slide until the rope holes 3211 are not aligned with the rope holes 311 of the two cylinders.
Both of the barrel cord holes 311 are located near the closure plate and the locking spring 33 has a tendency to stretch and spring to urge the tab 321 away from the closure plate.
The locking assembly 3 further includes a locking ring 324, and the link 322 is threadedly coupled to the locking ring 324.
The block rope hole 3211 and the hole walls of the two cylinder rope holes 311 are respectively provided with rough grains.
The locking assembly 3 is magnetically attracted to the bottom end of the fastening screw 111 or to the outside of the fastening nut 12.
The working process of the invention is as follows:
firstly, the fastening screw 111 is threaded through two segments to be connected in sequence and then is in threaded connection with the fastening nut 12. Subsequently, as shown in fig. 5, the pressing plate 323 is pressed to push the protrusion 321 to gradually approach the sealing plate along the barrel passage until the string holes 3211 are aligned with the two barrel string holes 311. Then, the free end of the rope 22 is pulled out from the blind hole 113, sequentially passes through the parent rope holes 121, and then passes through the block rope hole 3211 and the two cylinder rope holes 311, and the anti-loosening spring 21 is in a stretched state. Then, as shown in fig. 6, the pressing plate 323 is released, and the locking spring 33 pushes the protrusion 321 to move away from the sealing plate along the barrel channel gradually until the rope hole 3211 is staggered with the two barrel rope holes 311 and forces one of the rope bodies 22 to bend in the barrel channel, so as to limit the free end of the rope body 22. Finally, as shown in fig. 7, the locking ring 324 is rotated until the locking ring 324 abuts the housing 31.
According to the invention, the anti-loosening assembly is formed by arranging the anti-loosening spring and the rope body, is arranged in the blind hole of the fastening screw of the fastening bolt and can be matched with the locking assembly, and the anti-loosening spring is utilized to continuously give the fastening nut the elastic force close to the fastening screw head of the fastening bolt after the assembly is finished, so that the fastening nut is effectively prevented from being gradually unscrewed due to vibration, and the safety of construction in a construction site is further ensured; by additionally arranging the anti-loosening bolt and the bolt seat, the bolt seat can be driven to gradually approach or be far away from the fastening screw head of the fastening bolt by utilizing the rotation of the anti-loosening bolt, the stretching length of the anti-loosening spring is accurately adjusted, and the elasticity of the fastening nut pulled by the anti-loosening spring is further controlled; the plurality of parent body rope holes are arranged outside the central screw hole of the fastening nut in a surrounding manner, so that the stability of the fastening nut pulled by the rope body is effectively enhanced; the locking assembly is formed by arranging the shell, the plug and the locking spring, and the locking spring can be used for forcing the rope hole of the barrel body and the rope hole to be staggered, so that the free end of the rope body is fixed; through additionally arranging the locking ring in threaded connection with the link rod, the depth of the lug which can extend into the channel of the barrel is adjusted, the phenomenon that the rope hole of the barrel and the rope hole coincide with each other again after locking is completed is avoided, and then the free end of the rope body is prevented from automatically falling off.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (8)
1. The utility model provides a high-strength curved bar check fastener which characterized in that: the anti-loosening device comprises a fastener body (1), an anti-loosening assembly (2) and a locking assembly (3), wherein the fastener body (1) comprises a fastening bolt (11) and a fastening nut (12), the fastening bolt (11) comprises a fastening screw (111) and a fastening screw head (112), the fastening screw (111) is arc-shaped, one end of the fastening screw is fixed with the fastening screw head (112), the other end of the fastening screw is in threaded connection with the fastening nut (12), a blind hole (113) is formed in the end face of one end, provided with the fastening nut (12), of the fastening screw (111), the anti-loosening assembly (2) comprises an anti-loosening spring (21) and a rope body (22), the anti-loosening spring (21) is located in the blind hole (113), one end of the anti-loosening spring is connected with the top end face of the blind hole (113), the other end of the anti-loosening spring is connected with one end of the rope body (22), and the other end of the rope body (22) is connected with the locking assembly (3) after penetrating out of the blind hole (113), the locking component (3) can not extend into the blind hole (113).
2. A high-strength curved bar check fastener as recited in claim 1, wherein: the fastening nut (12) is provided with a plurality of parent rope holes (121) around the central screw hole, and the other end of the rope body (22) penetrates through the parent rope holes after penetrating through the blind hole (113).
3. A high-strength curved bar check fastener as recited in claim 1, wherein: the anti-loosening assembly (2) further comprises an anti-loosening bolt (23) and a bolt seat (24), a screw hole (114) penetrating through the blind hole (113) is formed in the fastening screw head (112), the anti-loosening bolt (23) comprises an anti-loosening screw rod and an anti-loosening screw head, one end of the anti-loosening screw rod is fixed to the anti-loosening screw head, the other end of the anti-loosening screw rod is rotatably connected with the bolt seat (24) located in the blind hole (113) after the screw thread penetrates through the screw hole (114), and the bolt seat (24) is fixed to one end of the rope body (22).
4. A high-strength curved bar check fastener as claimed in any one of claims 1 to 3, wherein: the locking assembly (3) comprises a shell (31), a plug (32) and a locking spring (33), wherein the shell (31) is in a cylindrical shape with one end closed by a sealing plate and forms a cylinder channel with an opening, two cylinder rope holes (311) penetrating through the cylinder channel are oppositely arranged on the shell wall of the shell (31), the plug (32) comprises a lug (321), a link rod (322) and a pressing plate (323), two ends of the link rod (322) are respectively connected with the lug (321) and the pressing plate (323), one end of the link rod (322) with the lug (321) extends into the cylinder channel, the lug (321) is provided with a block rope hole (3211), the block rope hole (3211) can be aligned or misaligned with the two cylinder rope holes (311) during the sliding of the lug (321) along the cylinder channel, the locking spring (33) is positioned in the cylinder channel, and two ends of the locking spring are respectively connected with the sealing plate and the lug (321), the locking spring (33) has an elastic tendency of driving the lug (321) to slide until the rope holes (3211) are not aligned with the two barrel rope holes (311).
5. A high-strength curved bar check fastener as claimed in claim 4, wherein: two barrel rope holes (311) are arranged close to the sealing plate, and the locking spring (33) has an elastic tendency of extending so as to push the lug (321) away from the sealing plate.
6. A high-strength curved bar check fastener as claimed in claim 4, wherein: the locking assembly (3) further comprises a locking ring (324), and the link rod (322) is in threaded connection with the locking ring (324).
7. A high-strength curved bar check fastener as claimed in claim 4, wherein: the block rope hole (3211) and the hole walls of the two cylinder rope holes (311) are respectively provided with rough grains.
8. A high-strength curved bar check fastener as claimed in claim 4, wherein: the locking component (3) is magnetically adsorbed at the bottom end of the fastening screw rod (111) or outside the fastening nut (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185337.9A CN114542577B (en) | 2022-02-28 | 2022-02-28 | High-strength type bent rod anti-loosening fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185337.9A CN114542577B (en) | 2022-02-28 | 2022-02-28 | High-strength type bent rod anti-loosening fastener |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114542577A true CN114542577A (en) | 2022-05-27 |
| CN114542577B CN114542577B (en) | 2023-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210185337.9A Active CN114542577B (en) | 2022-02-28 | 2022-02-28 | High-strength type bent rod anti-loosening fastener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114542577B (en) |
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| CN214837725U (en) * | 2021-05-25 | 2021-11-23 | 浙江捷能汽车零部件有限公司 | Anti-loosening fastening device for automobile transmission system |
| CN113983061A (en) * | 2021-11-05 | 2022-01-28 | 贵州风雷航空军械有限责任公司 | Thread anti-loosening mechanism and anti-loosening installation method |
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2022
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| RU2154203C1 (en) * | 1998-12-23 | 2000-08-10 | Орловский государственный технический университет | Bolt for mounting in dead opening |
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| CN214036477U (en) * | 2020-10-16 | 2021-08-24 | 温州精拓标准件有限公司 | Anti-drop and anti-theft nut |
| CN213839236U (en) * | 2020-11-18 | 2021-07-30 | 常州军悦机械有限公司 | Anti-drop and anti-loose nut |
| CN213839223U (en) * | 2020-11-23 | 2021-07-30 | 海盐嘉海五金有限公司 | Part connecting anti-loose bolt for engineering machinery |
| CN214499726U (en) * | 2021-01-11 | 2021-10-26 | 浙江乍浦科技有限责任公司 | Anti-loosening fastener |
| CN112576604A (en) * | 2021-01-20 | 2021-03-30 | 周春花 | Bolt and nut assembly |
| CN214837725U (en) * | 2021-05-25 | 2021-11-23 | 浙江捷能汽车零部件有限公司 | Anti-loosening fastening device for automobile transmission system |
| CN113983061A (en) * | 2021-11-05 | 2022-01-28 | 贵州风雷航空军械有限责任公司 | Thread anti-loosening mechanism and anti-loosening installation method |
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|---|---|
| CN114542577B (en) | 2023-12-08 |
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