CN114508622B - Anti-loosening device of nuclear power valve - Google Patents
Anti-loosening device of nuclear power valve Download PDFInfo
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- CN114508622B CN114508622B CN202210140571.XA CN202210140571A CN114508622B CN 114508622 B CN114508622 B CN 114508622B CN 202210140571 A CN202210140571 A CN 202210140571A CN 114508622 B CN114508622 B CN 114508622B
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- valve
- loosening
- flexible
- nuclear power
- arc
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- 239000000725 suspension Substances 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims description 25
- 238000012856 packing Methods 0.000 description 7
- 230000002265 prevention Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
-
- 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
Abstract
The invention discloses a nuclear power valve anti-loosening device, which belongs to the field of valve equipment and comprises a valve body, a valve cover, a valve rod and an anti-loosening assembly, wherein the anti-loosening assembly comprises a pawl assembly arranged on the valve cover and an anti-loosening bolt in threaded connection with the valve body, and the pawl assembly comprises a connecting ring fixedly arranged on the valve cover and a plurality of flexible ratchets circumferentially distributed on the connecting ring; the flexible ratchets are arc-shaped, one end of each flexible ratchet is connected with the connecting ring, the other end of each flexible ratchet is a suspension end, and the anti-loose bolts are positioned between every two adjacent flexible ratchets; the anti-loosening assembly can prevent the flexible ratchet and the arc-shaped baffle from passing through the anti-loosening bolt when the valve cover rotates clockwise and anticlockwise, so that the anti-loosening purpose is achieved.
Description
Technical Field
The invention relates to the field of valve equipment, in particular to a locking device of a nuclear power valve.
Background
The temperature of the working environment of the nuclear power valve is between minus 29 ℃ and 576 ℃, the working pressure is between 150bar and 345bar, and the requirements on the looseness prevention between the valve cover and the valve body are particularly strict due to high temperature and high pressure. Before, the anti-loosening structure of the nuclear power valve is a double-nut anti-loosening structure and a locking cylindrical pin anti-loosening structure. Double nut locking structure: the locking cylindrical pin locking structure has the advantages that the outer surface of the valve cover is mostly of an outer hexagonal structure, so that the locking is convenient to use a wrench, after the valve body is screwed with the inner threads and the outer threads of the valve cover, the relative position of the outer hexagonal surface of each group of valve cover and the valve body on the circumferential position is uncertain, because the inner threads and the outer threads have processing errors in the radial direction and the axial direction, a gap exists between the locking cylindrical pin and the hexagonal positioning surface, the loosening phenomenon can occur in the use process, the valve is leaked, if the valve cover is screwed with the valve body firstly, and then each group of locking cylindrical pin holes are assembled, the production efficiency is low, and the valve is inconvenient to maintain and disassemble. The invention relates to a nuclear power valve check device, which is characterized in that a helium leak test is generally required for some special valves such as a corrugated pipe valve, leakage points are most easily formed at the joint of a valve cover and a valve body of the valves, the quality guarantee period of the nuclear power valve is generally 5-60 years, and the nuclear power valve check device is particularly important for the reliability of the valve check device.
Disclosure of Invention
The invention provides a locking device of a nuclear power valve, which can solve the problems pointed out in the background technology.
A nuclear power valve looseness prevention device comprises a valve body, a valve cover, a valve rod and a looseness prevention assembly, wherein the looseness prevention assembly comprises a pawl assembly arranged on the valve cover and a looseness prevention bolt connected to the valve body in a threaded mode, the pawl assembly comprises a connecting ring fixedly arranged on the valve cover and a plurality of flexible ratchets circumferentially distributed on the connecting ring;
the flexible ratchets are arc-shaped, one end of each flexible ratchet is connected with the connecting ring, the other end of each flexible ratchet is a suspension end, and the anti-loose bolts are located between every two adjacent flexible ratchets.
Preferably, the valve further comprises an arc-shaped baffle plate and a limiting cylinder fixedly arranged on the valve rod, and the suspension end of the flexible ratchet is connected to the middle position of the convex surface of the arc-shaped baffle plate; the arc-shaped baffle plate is provided with two suspension ends, wherein the suspension end far away from the connecting ring is connected with the middle position of the convex surface of the flexible ratchet through a connecting block;
the height of the arc-shaped baffle is greater than that of the flexible ratchet;
a convex ring is fixedly arranged on the limiting cylinder, and a yielding groove for yielding the convex ring is formed in the part, higher than the flexible ratchet, of the arc-shaped baffle;
when the nuclear power valve is in a half-open state, the convex ring is located at the notch of the abdicating groove, and when the nuclear power valve is in a closed state and a fully-open state, the convex ring is located on the lower side and the upper side of the abdicating groove respectively.
Preferably, the circle center of the concave surface of the flexible ratchet is located at the suspension end of the arc-shaped baffle close to the connecting ring.
Preferably, the bottom end of the valve rod is provided with a valve core, the top of the valve core is provided with a first sealing surface, and the valve cover is internally provided with a second sealing surface.
Preferably, the height of the arc-shaped baffle is twice as high as that of the flexible ratchet.
Preferably, the anti-loosening bolt is sleeved with an anti-loosening sleeve.
Preferably, the flexible ratchet has a wide root and a narrow tooth top, the tooth top is formed by two arcs with different radiuses and different circle centers, and the tooth top can elastically deform only in one circumferential direction.
Compared with the prior art, the invention has the beneficial effects that:
when the valve is closed and the flexible graphite packing is prevented from being flushed, the torque of the rotary handle is increased and transmitted to the joint of the valve cover and the valve body, so that the valve cover and the valve body become loose.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a top view of a check assembly of the present invention;
FIG. 3 is a schematic structural view of another anti-loosening assembly according to the present invention;
fig. 4 is a top view of another anti-loosening assembly of the present invention.
Description of the reference numerals:
1-valve body, 2-valve cover, 3-valve rod, 5-anti-loose bolt, 6-flexible ratchet, 7-limiting cylinder, 8-arc baffle, 9-connecting block, 10-convex ring, 11-abdicating groove, 12-valve core, 13-sealing surface I, 14-sealing surface II, 21-handle, 22-packing gland, 23-flexible graphite packing and 24-metal winding gasket.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
As shown in fig. 1 to 4, the anti-loosening device for a nuclear power valve provided by the embodiment of the invention comprises a valve body 1, a valve cover 2, a valve rod 3 and an anti-loosening assembly;
the working process of the nuclear grade instrument stop valve is as follows: when the valve is to be closed, the handle 21 is rotated clockwise (when the packing gland 22 and the internal and external threads of the valve rod 3 are rotated rightwards), the valve rod 3 drives the valve core 12 at the lower end of the valve rod to move downwards, so that the sealing surface at the bottom of the valve core 12 is in tight contact with the sealing surface of the valve body 1, the valve is closed at the moment, a valve flowing medium enters the valve body from the left end and is prevented by the valve needle and the sealing surface of the valve body, so that the medium stops flowing to the right end of the valve, if the valve needs to be opened, the handle 21 is rotated anticlockwise, the valve rod 3 drives the valve core 12 to move upwards, so that the sealing surface of the valve core 12 and the sealing surface of the valve body 1 are separated to form a gap, the valve is opened, the medium enters a flow channel from the left end of the valve and smoothly enters the right end of the valve, under the general conditions, the flowing medium in the valve is high temperature and high pressure, the highest temperature reaches 576 ℃, the highest pressure reaches 34.5 MPa, the valve is opened for a long time, the high-speed fluid can wash the flexible graphite packing 23 through the clearance between the valve rod 3 and the valve cover 2, the sealing performance of the packing and the valve rod 3 can be reduced, and the service life of the valve is influenced, in order to solve the problem, a valve inverse sealing device is added during the valve design, when the valve is opened, the handle 1 is continuously rotated anticlockwise, a first sealing surface of a valve core 12 at the lower end of the valve rod 3 is contacted with a second sealing surface 14 in the valve cover 2, the washing of the high-speed, high-pressure and high-temperature fluid on the flexible graphite packing 23 by the valve for a long time is solved, if the inverse sealing plays a corresponding role, a certain anticlockwise torque must be applied to the handle 21, when the anticlockwise torque is large to a certain extent, the sealing performance of a metal winding gasket 24 between the valve cover 2 and the valve body 1 can be reduced, because the right-handed thread connection is adopted between the valve cover 2 and the valve body 1, and the unscrewing direction of the valve cover 2 and the valve body 1 is exactly the same, under the condition that the larger the force used by the reverse seal is, the more the sealing performance between the valve cover 2 and the valve body 1 is reduced, the more the sealing performance is reduced, the more the failure of the stop valve of the nuclear power instrument can be caused in serious cases, and major safety accidents can occur, if the threads between the valve cover 2 and the valve body 1 are changed into the left-handed thread connection, when the reverse seal is used, the anti-loosening effect between the valve cover 2 and the valve body 1 can be realized, but when the valve is closed and the handle 1 is clockwise rotated to a certain torque, the anti-loosening direction of the left-handed thread between the valve cover 2 and the valve body 1 is exactly the same, the threaded connection part between the valve cover 2 and the valve body 1 can also be loosened, and the safety accidents are caused, and the problem can be thoroughly solved only by using an anti-loosening device between the valve cover 2 and the valve body 1;
the invention designs two anti-loosening assemblies, wherein one anti-loosening assembly comprises a pawl assembly arranged on the valve cover 2 and an anti-loosening bolt 5 which is in threaded connection with the valve body 1, the pawl assembly comprises a connecting ring fixedly arranged on the valve cover 2 and a plurality of flexible ratchets 6 which are circumferentially distributed on the connecting ring;
the flexible ratchets 6 are arc-shaped, one end of each flexible ratchet 6 is connected with the connecting ring, the other end of each flexible ratchet is a suspension end, and the anti-loose bolts 5 are positioned between every two adjacent flexible ratchets 6;
when the valve cover 2 is gradually screwed into the valve body 1, the anti-loose assembly is contacted with the outer circle of the anti-loose bolt 5 assembled on the valve body 1, because the flexible ratchets 6 are arc-shaped, the root part is wide, the tooth top is narrow, the tooth top is formed by two arcs with different radiuses and different circle centers, the tooth top can elastically deform in one circumferential direction, and the other circumferential direction can not elastically deform, when the valve cover 2 continuously rotates clockwise and downwards (when the valve cover 2 is in threaded connection with the valve body 1 to rotate rightwards), the lower end face of the valve cover 2 is contacted with the metal winding gasket 24 and is tightly pressed with the upper end face of the middle hole of the valve body 1, the valve cover assembly is screwed by a torque wrench according to a specified torque force, the sealing of the center of the valve is realized, when all the parts and components of the valve are connected and installed in a specified manner, the handle 1 is rotated anticlockwise, see figure II, after a first sealing surface ratchet 13 of a sealing surface of a valve core 12 is sealed with a second sealing surface 14 of the valve cover 2, the valve cover 2 has an anticlockwise torque, if the torque is continuously increased, the flexible ratchets 6 always have an addendum surface of a central surface of the bolt 5 on the central surface of the bolt 5, the anti-loose bolt, the anti-loose function of preventing the anti-loose bolt 2 can only by using the anti-loose action force, and the anti-loose bolt 2 can not rotate anticlockwise rotation clockwise. If the threaded connection between the valve cover 2 and the valve body 1 is left-handed threaded connection, the anti-loosening effect of the left-handed threads can be achieved as long as the direction of the flexible ratchet 6 on the valve cover 2 is changed;
another anti-loosening assembly is shown in fig. 3 and 4, and comprises an arc-shaped baffle plate 8, a limiting cylinder 7 fixedly arranged on the valve rod 3, a pawl assembly arranged on the valve cover 2 and an anti-loosening bolt 5 in threaded connection with the valve body 1, wherein the suspension end of the flexible ratchet 6 is connected to the middle position of the convex surface of the arc-shaped baffle plate 8; the arc-shaped baffle 8 is provided with two suspension ends, wherein the suspension end far away from the connecting ring is connected with the middle position of the convex surface of the flexible ratchet 6 through a connecting block 9;
the circle center of the concave surface of the flexible ratchet 6 is positioned at the suspension end, close to the connecting ring, of the arc-shaped baffle 8, and when the anti-loosening bolt 5 abuts against the convex surface of the flexible ratchet 6, the deformation degree of the arc-shaped baffle 8 can be reduced by the design, so that the flexible ratchet 6, the connecting block 9 and the arc-shaped baffle 8 are further prevented from passing through the anti-loosening bolt 5 in the integral structure, and the anti-loosening effect is improved;
the height of the arc-shaped baffle 8 is greater than that of the flexible ratchet 6;
a convex ring 10 is fixedly arranged on the limiting cylinder 7, and a yielding groove 11 for yielding the convex ring 10 is formed in the part, higher than the flexible ratchet 6, of the arc baffle 8;
when valve gap 2 is the dextrorotation with 1 threaded connection of valve body, when the nuclear power valve is in half-open state, bulge loop 10 is located the notch department of groove of stepping down 11, can directly rotate valve gap 2 this moment, flexible ratchet 6's convex surface, connecting block 9 and cowl 8 contact with lock nut 5 in proper order and are crowded to deformation (bulge loop 10 does not contact with cowl 8 this moment in groove of stepping down 11) to can pass through lock nut 5, until accomplishing the installation, need install valve gap 2 earlier and go the mode of installing lock nut 5 again than among the prior art, when the nuclear power valve is in closing and the complete open mode, bulge loop 10 is located the downside and the upside of groove of stepping down 11 respectively, no matter at this moment, whether apply left-handed power or dextrorotation power to valve gap 2 and make valve gap 2 loose or when becoming tight, when lock nut 5 is when the concave surface of cowl 8, can block valve gap 2 and rotate, when lock nut 5 contradicts at flexible conflict 6's convex surface, flexible conflict 6 takes place deformation, a suspension end of cowl 8 can be on the bulge loop 10, thereby can not enough produce the left-handed deformation of a 3 condition of lock nut, thereby it can not enough to prevent the condition of valve rod 3.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (6)
1. The anti-loosening device of the nuclear power valve is characterized by comprising a valve body, a valve cover, a valve rod and an anti-loosening assembly, wherein the anti-loosening assembly comprises a pawl assembly arranged on the valve cover and an anti-loosening bolt in threaded connection with the valve body, and the pawl assembly comprises a connecting ring fixedly arranged on the valve cover and a plurality of flexible ratchets circumferentially distributed on the connecting ring;
the flexible ratchets are arc-shaped, one end of each flexible ratchet is connected with the connecting ring, the other end of each flexible ratchet is a suspension end, and the anti-loose bolts are positioned between every two adjacent flexible ratchets;
the valve rod is fixedly arranged on the valve body, the suspension end of the flexible ratchet is connected with the middle position of the convex surface of the arc-shaped baffle; the arc-shaped baffle plate is provided with two suspension ends, wherein the suspension end far away from the connecting ring is connected with the middle position of the convex surface of the flexible ratchet through a connecting block;
the height of the arc-shaped baffle is greater than that of the flexible ratchet;
a convex ring is fixedly arranged on the limiting cylinder, and a yielding groove for yielding the convex ring is formed in the part, higher than the flexible ratchet, of the arc-shaped baffle;
when the nuclear power valve is in a half-open state, the convex ring is located at the notch of the abdicating groove, and when the nuclear power valve is in a closed state and a fully-open state, the convex ring is located on the lower side and the upper side of the abdicating groove respectively.
2. The anti-loosening device for the nuclear power valve as claimed in claim 1, wherein the center of the concave surface of the flexible ratchet is located at the floating end of the arc-shaped baffle close to the connecting ring.
3. The anti-loosening device for the nuclear power valve as claimed in claim 1, wherein a valve core is arranged at the bottom end of the valve rod, a first sealing surface is arranged at the top of the valve core, and a second sealing surface is arranged in the valve cover, so that the second sealing surface can be attached to the first sealing surface when the valve rod is rotated.
4. The anti-loosening device for a nuclear power valve as claimed in claim 1, wherein the height of the arc-shaped baffle is twice the height of the flexible ratchet.
5. The anti-loosening device of the nuclear power valve as claimed in claim 1, wherein the anti-loosening bolt is sleeved with an anti-loosening sleeve.
6. The anti-loosening device for the nuclear power valve as claimed in claim 1, wherein the flexible ratchet teeth are wide at the root and narrow at the top, the top is formed by two circular arcs with different radiuses and different circle centers, and the top can be elastically deformed only in one circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210140571.XA CN114508622B (en) | 2022-02-16 | 2022-02-16 | Anti-loosening device of nuclear power valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210140571.XA CN114508622B (en) | 2022-02-16 | 2022-02-16 | Anti-loosening device of nuclear power valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114508622A CN114508622A (en) | 2022-05-17 |
| CN114508622B true CN114508622B (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210140571.XA Active CN114508622B (en) | 2022-02-16 | 2022-02-16 | Anti-loosening device of nuclear power valve |
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| Country | Link |
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| CN (1) | CN114508622B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212455165U (en) * | 2020-06-12 | 2021-02-02 | 蒋建伟 | Anti-loosening screw fastener |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007155110A (en) * | 2005-12-08 | 2007-06-21 | Chugoku Electric Power Co Inc:The | Nut |
| CN104600504A (en) * | 2015-02-11 | 2015-05-06 | 苏州同泰新能源科技有限公司 | Anti-loose photovoltaic connector |
| CN110508839A (en) * | 2019-07-02 | 2019-11-29 | 山东威达雷姆机械有限公司 | A kind of anti-loosening locking drill chuck |
| CN110259808B (en) * | 2019-07-04 | 2021-06-25 | 龚作钰 | Preset check bolt assembly that moment of torsion control was dismantled |
| CN214404256U (en) * | 2020-12-14 | 2021-10-15 | 河北洁仕宝日用塑料制品有限公司 | Anti-loosening handheld rod and mop using same |
| CN216923246U (en) * | 2021-12-13 | 2022-07-08 | 江苏科维仪表控制工程有限公司 | Anti-loosening device of nuclear power valve |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212455165U (en) * | 2020-06-12 | 2021-02-02 | 蒋建伟 | Anti-loosening screw fastener |
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| CN114508622A (en) | 2022-05-17 |
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