CN105257665A - Self-tightening multi-screw-pair anti-loose mechanical fastening mechanism - Google Patents
Self-tightening multi-screw-pair anti-loose mechanical fastening mechanism Download PDFInfo
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- CN105257665A CN105257665A CN201510628533.9A CN201510628533A CN105257665A CN 105257665 A CN105257665 A CN 105257665A CN 201510628533 A CN201510628533 A CN 201510628533A CN 105257665 A CN105257665 A CN 105257665A
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Abstract
The invention relates to a self-tightening multi-screw-pair anti-loose mechanical fastening mechanism. The technical problem that existing fastening mechanisms are prone to loosing is solved. The self-tightening multi-screw-pair anti-loose mechanical fastening mechanism comprises a bolt body; two threaded sections with opposite screw threaded directions are arranged on the bolt body and are in threaded connection with a compression nut and an anti-loose nut respectively; the bolt body is sleeved with an adjusting ring located between the compression nut and the anti-loose nut; the compression nut is connected with the adjusting ring through a single-direction rotating structure; a circumferential positioning structure which can circumferentially position the adjusting ring and the anti-loose nut is arranged between the adjusting ring and the anti-loose nut. The self-tightening multi-screw-pair anti-loose mechanical fastening mechanism has the advantages that the design is reasonable, the structure is simple, the connecting strength is high, the stability is good, the phenomenon of loosing during connection can be prevented, and the self-locking function is achieved.
Description
Technical field
The invention belongs to technical field of fastening, especially relate to the anti-loose mechanical retention mechanism of the many screw pairs of a kind of self tightening.
Background technique
Screw pair retention mechanism is a kind of retention mechanism of common screw-thread fit, the modal fastening connection piece cooperatively interacted for bolts and nuts, realizes being threaded to machinery link by the screw thread of bolt.The switching performance of bolts and nuts is good, structure is simple, be widely used in technical field of mechanical equipment, but bolts and nuts also exist the defect easily loosened, the gap shaking link along with equipment frequently increases, and causes bolts and nuts to loosen, even comes off, the mutual break-off of connecting body is easily there is, serious easy generation security incident when like this some being mechanically connected.
In order to solve prior art Problems existing, people have carried out long-term exploration, propose solution miscellaneous.Such as, Chinese patent literature discloses a kind of left-hand thread chek bolt [application number: 201110041677.6], be made up of left-hand thread nut, standard nut and screw rod, tightening latch termination is provided with one section of reverse thread, the screw diameter at reverse thread place is slightly less than the nominal diameter of bolt, and left-hand thread nut makes half cavity type.
Such scheme improves the problem easily loosened when existing bolts and nuts connect to a certain extent, but, it is low still to there is join strength in the program, when standard nut vibrations are large, standard nut and left-hand thread nut easily occur that gap or standard nut easily promote left-hand thread nut and to shrink back the problem causing loosening between standard nut and connecting body, and finally cause standard nut and left-hand thread nut to depart from bolt situation occurring.
Summary of the invention
The object of the invention is for the problems referred to above, provide a kind of reasonable in design, structure simple, has the anti-loose mechanical retention mechanism of the many screw pairs of self tightening of anti-loose function.
For achieving the above object, present invention employs following technical proposal: the anti-loose mechanical retention mechanism of the many screw pairs of this self tightening, comprise the body of bolt, the described body of bolt have two thread sections be connected with anti-loosing nut screw thread with gland nut respectively, and the hand of spiral of two thread sections is contrary, it is characterized in that, the described body of bolt is arranged with the regulating ring between gland nut and anti-loosing nut, described gland nut is connected by one-way rotation structure with between regulating ring, locate by one-way rotation structure and regulating ring are circumferential towards the gland nut described in when the circumference rotational motion of anti-loosing nut side or movement tendency when gland nut has to rotate relative to regulating ring circumference away from the gland nut described in when the circumference rotational motion of anti-loosing nut side or movement tendency and to have when gland nut, the circumferential positioning structure that regulating ring and anti-loosing nut circumference can be made to locate is provided with between described regulating ring and anti-loosing nut.During use, when gland nut towards away from anti-loosing nut side circumference rotational motion or movement tendency time described in gland nut can relative to regulating ring circumference rotate, namely when gland nut is towards the motion of locking direction, gland nut can rotate relative to regulating ring circumference, gland nut and regulating ring are separated from each other, when compacted object exists, this athletic meeting is prevented from certain interval, and anti-loosing nut is because one-way rotation structure can not depart from the body of bolt, locate by one-way rotation structure and regulating ring are circumferential towards the gland nut described in when the circumference rotational motion of anti-loosing nut side or movement tendency when gland nut has, simultaneously, because regulating ring and anti-loosing nut circumference are positioned together by circumferential positioning structure, and gland nut screw thread and anti-loosing nut screw thread are opposite direction screw threads, make gland nut cannot rotate towards anti-loosing nut side circumference like this, but the rotation potential energy of gland nut gives anti-loosing nut by one-way rotation structure through regulating ring transmission, drive anti-loosing nut to the circumferential rotational motion of gland nut side or movement tendency, gland nut is so just made to be in continuous self-tightening process all the time, then the auto-lock function of mechanism is realized, locate due to anti-loosing nut and regulating ring circumference simultaneously and make anti-loosing nut to depart from the body of bolt due to the existence of one-way rotation structure.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, described one-way rotation structure comprises and is arranged on gland nut one end and the compression helicoid distributed in the shape of a spiral and be arranged on regulating ring one end and the cooperation helicoid distributed in the shape of a spiral, described compression helicoid with compress helicoid and match and forms one-way rotation helicoid pair.When gland nut has towards the circumference rotational motion of anti-loosing nut side or movement tendency, due to compression helicoid here with coordinate helicoid mutually against can make gland nut and regulating ring circumference locate, obviously, the structure of one-way rotation structure is varied, and those skilled in the art can also select other structures.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, formed between described compression helicoid one end and the body of bolt and compress spiral section, described cooperation helicoid one end coordinates spiral section with being formed between the body of bolt 1, and compression spiral section described in when gland nut and regulating ring circumference locates with coordinate spiral section energy mutual against.Namely by compressing spiral section and coordinating spiral section energy mutual to realizing gland nut and regulating ring is located mutually.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, described compression helicoid is involute helicoid with coordinating helicoid.Namely by the nonreversibility know-why that helicoid moves, thus the function of unidirectional movement is realized.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, described gland nut end is provided with the first involute heliconid, and the first described involute heliconid end face forms above-mentioned compression helicoid, described regulating ring end has the second involute heliconid matched with the first involute heliconid, and the second described involute heliconid end face forms above-mentioned cooperation helicoid.Namely the second above-mentioned involute heliconid to be inserted on the first involute heliconid and until to coordinate helicoid to be resisted against to compress on helicoid and cannot be rotated further according to gland nut screw-threaded coupling direction.Here the first involute heliconid to insert in annular groove and cooperatively interacts with the second involute heliconid, which enhances the stability of connection.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, the Hand of spiral of described compression helicoid and cooperation helicoid is identical with the thread section hand of thread spiral that the body of bolt is connected with gland nut.This ensure that one-way rotation direction meets the anti-loose demand of this retention mechanism.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, described circumferential positioning structure comprises and is somely arranged on regulating ring outer circumferential and all along the positioning hole that regulating ring is axially arranged, described anti-loosing nut is provided with at least one matching hole axially arranged along anti-loosing nut, described matching hole is with in positioning hole, any one is corresponding, and described positioning hole is connected with matching hole by locating column.Corresponding with one of them positioning hole and be connected by locating column by matching hole, realize that anti-loosing nut and regulating ring are circumferential locates like this.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, described matching hole is step hole, and described positioning hole circumference is uniformly distributed setting.Here locating column upper end is made up of elastic material, and lower end is made up of rigid material, this ensure that locating column can be positioned in step hole securely.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, described regulating ring end face and anti-loosing nut end face against.
In the anti-loose mechanical retention mechanism of the many screw pairs of above-mentioned self tightening, the described body of bolt is coaxially made up of different the first bolt shank of diameter and the second bolt shank, and two thread sections are formed on the first bolt shank and the second bolt shank respectively successively, described gland nut is sheathed on the first bolt shank, described anti-loosing nut is sheathed on the second bolt shank, and the diameter of the first described bolt shank is greater than the diameter of the second bolt shank; Two thread section screw threads of the described body of bolt form collet threaded pair and anti-loose screw pair thus respectively with gland nut and anti-loosing nut screw thread.Can ensure that gland nut and anti-loosing nut can be set in the first bolt shank and the second bolt shank respectively smoothly like this.
Compared with prior art, the advantage of the anti-loose mechanical retention mechanism of the many screw pairs of this self tightening is: reasonable in design, and structure is simple, and join strength is high, good stability, can prevent from occurring the phenomenon that gets loose when connecting, and has auto-lock function.
Accompanying drawing explanation
Fig. 1 is the surface structure schematic diagram of embodiment provided by the invention.
Fig. 2 is the half section structural representation of embodiment provided by the invention.
Fig. 3 is the gland nut half section structural representation of embodiment provided by the invention.
Fig. 4 is the plan structure schematic diagram of the gland nut of embodiment provided by the invention.
Fig. 5 is the half section structural representation of the regulating ring of embodiment provided by the invention.
Fig. 6 is the plan structure schematic diagram of the regulating ring of embodiment provided by the invention.
Fig. 7 be the regulating ring of embodiment provided by the invention look up structural representation.
Fig. 8 is the half section structural representation of the anti-loosing nut of embodiment provided by the invention.
Fig. 9 is the plan structure schematic diagram of the anti-loosing nut of embodiment provided by the invention.
Figure 10 is the structural representation of the body of bolt of embodiment provided by the invention.
In figure, the body of bolt 1, first bolt shank 11, second bolt shank 12, gland nut 2, anti-loosing nut 3, regulating ring 4, one-way rotation structure 5, compression helicoid 51, cooperation helicoid 53, compression spiral section 54, first involute heliconid 55, cooperation spiral section 56, second involute heliconid 57, circumferential positioning structure 6, positioning hole 61, matching hole 62, locating column 63, collet threaded pair 8, anti-loose screw pair 9, one-way rotation helicoid pair 10.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
As shown in Figure 1-2, the anti-loose mechanical retention mechanism of the many screw pairs of this self tightening, comprise the body of bolt 1, the body of bolt 1 have two thread sections be connected with anti-loosing nut 3 screw thread with gland nut 2 respectively, and the hand of spiral of two thread sections is contrary, the body of bolt 1 is arranged with the regulating ring 4 between gland nut 2 and anti-loosing nut 3, be connected by one-way rotation structure 5 between gland nut 2 with regulating ring 4, to rotate relative to regulating ring 4 circumference away from gland nut 2 when the circumference rotational motion of anti-loosing nut 3 side or movement tendency when gland nut 2 has and to locate by one-way rotation structure 5 and regulating ring 4 are circumferential towards gland nut 2 when the circumference rotational motion of anti-loosing nut 3 side or movement tendency when gland nut 2 has, the circumferential positioning structure 6 that regulating ring 4 can be made to locate with anti-loosing nut 3 circumference is provided with between regulating ring 4 and anti-loosing nut 3.During use, when gland nut 2 towards away from anti-loosing nut 3 side circumference rotational motion or movement tendency time described in gland nut 2 can relative to regulating ring 4 circumference rotate, namely when gland nut 2 is towards the motion of locking direction, gland nut 2 can rotate relative to regulating ring 4 circumference, gland nut 2 and regulating ring 4 are separated from each other, when compacted object exists, this athletic meeting is prevented from certain interval, and anti-loosing nut 3 is because one-way rotation structure 5 can not depart from the body of bolt 1, located by one-way rotation structure 5 and regulating ring 4 circumference towards the gland nut 2 described in when the circumference rotational motion of anti-loosing nut 3 side or movement tendency when gland nut 2 has, simultaneously because regulating ring 4 and anti-loosing nut 3 circumference are positioned together by circumferential positioning structure 6, and gland nut 2 screw thread and anti-loosing nut 3 screw thread are opposite direction screw threads, make gland nut 2 cannot rotate towards anti-loosing nut 3 side circumference like this, but the rotation potential energy of gland nut 2 gives anti-loosing nut 3 by one-way rotation structure 5 through regulating ring 4 transmission, drive anti-loosing nut 3 to the circumferential rotational motion of gland nut 2 side or movement tendency, gland nut 2 is so just made to be in continuous self-tightening process all the time, then the auto-lock function of mechanism is realized, locate due to anti-loosing nut 3 and regulating ring 4 circumference simultaneously and make anti-loosing nut 3 cannot depart from the body of bolt 1 due to the existence of one-way rotation structure 5.
Particularly, as shown in figs. 2-10, here one-way rotation structure 5 comprises and is arranged on gland nut 2 one end and the compression helicoid 51 distributed in the shape of a spiral and be arranged on regulating ring 4 one end and the cooperation helicoid 53 distributed in the shape of a spiral, described compression helicoid 51 matches with compression helicoid 51 and forms one-way rotation helicoid pair 10, when gland nut 2 has towards the circumference rotational motion of anti-loosing nut 3 side or movement tendency, due to compression helicoid 51 here, against making, gland nut 2 and regulating ring 4 are circumferential locates mutually with coordinating helicoid 53, obviously, the structure of one-way rotation structure 5 is varied, those skilled in the art can also select other structures.Here formed between compression helicoid 51 one end and the body of bolt 1 and compress spiral section 54, described cooperation helicoid 53 one end coordinates spiral section 56 with being formed between the body of bolt 1, and compression spiral section 54 described in when gland nut 2 and regulating ring 4 circumference locates with coordinate spiral section 56 energy mutual against, namely be resisted against coordinate on spiral section 56 and until cannot be rotated further according to gland nut 2 screw-threaded coupling direction by compressing spiral section 54, thus realize gland nut 2 and mutually locate with regulating ring 4.Preferably, compression helicoid 51 is here involute helicoid with coordinating helicoid 53, namely by the nonreversibility know-why that helicoid moves, thus realizes the function of unidirectional movement.
Preferably, here gland nut 2 end is provided with the first involute heliconid 55, and the first involute heliconid 55 end face forms above-mentioned compression helicoid 51, regulating ring 4 end has the second involute heliconid 57 matched with the first involute heliconid 55, and the second involute heliconid 57 end face forms above-mentioned cooperation helicoid 53.Namely the second above-mentioned involute heliconid 57 to be inserted on the first involute heliconid 55 and until to coordinate helicoid 53 to be resisted against to compress on helicoid 51 and cannot be rotated further according to gland nut 2 screw-threaded coupling direction, which enhance the stability of connection, in order to bonding meets the anti-loose demand of this retention mechanism to sense of rotation, the Hand of spiral of compression helicoid 51 here and cooperation helicoid 53 is identical with the thread section hand of thread spiral that gland nut 2 is connected with on the body of bolt 1.
Further, here circumferential positioning structure 6 comprises and is somely arranged on regulating ring 4 outer circumferential and all along the positioning hole 61 that regulating ring 4 is axially arranged, anti-loosing nut 3 is provided with at least one matching hole 62 axially arranged along anti-loosing nut 3, matching hole 62 is with in positioning hole 61, any one is corresponding, and positioning hole 61 is connected with matching hole 62 by locating column 63, corresponding with one of them positioning hole 61 and be connected by locating column 63 by matching hole 62, realize anti-loosing nut 3 like this to locate with regulating ring 4 circumference, wherein preferably, here matching hole 62 is step hole, and positioning hole 61 circumference is uniformly distributed setting, here locating column 63 upper end is made up of elastic material, lower end is made up of rigid material, this ensure that locating column 63 can be positioned in step hole securely.
Regulating ring 4 end face in the present embodiment and anti-loosing nut 3 end face against.In order to ensure that anti-loosing nut 3 and gland nut 2 can be set on the body of bolt 1 respectively smoothly, here the body of bolt 1 is coaxially made up of different the first bolt shank 11 of diameter and the second bolt shank 12, and two thread sections are formed on the first bolt shank 11 and the second bolt shank 12 respectively successively, gland nut 2 is sheathed on the first bolt shank 11, anti-loosing nut 3 is sheathed on the second bolt shank 12, and the diameter of the first bolt shank 11 is greater than the diameter of the second bolt shank 12.The respective threaded section screw thread of gland nut 2 screw thread and the body of bolt 1 forms collet threaded pair 8, and the respective threaded section screw thread of anti-loosing nut 3 screw thread and the body of bolt 1 forms anti-loose screw pair 9.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ the body of bolt 1, first bolt shank 11, second bolt shank 12, gland nut 2, anti-loosing nut 3, regulating ring 4, one-way rotation structure 5 herein, compress helicoid 51, coordinate helicoid 53, compress spiral section 54, first involute heliconid 55, coordinate the terms such as spiral section 56, second involute heliconid 57, circumferential positioning structure 6, positioning hole 61, matching hole 62, locating column 63, collet threaded pair 8, anti-loose screw pair 9, one-way rotation helicoid pair 10, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (10)
1. the anti-loose mechanical retention mechanism of the many screw pairs of self tightening, comprise the body of bolt (1), the described body of bolt (1) have two thread sections be connected with anti-loosing nut (3) screw thread with gland nut (2) respectively, and the hand of spiral of two thread sections is contrary, it is characterized in that, the described body of bolt (1) is arranged with the regulating ring (4) be positioned between gland nut (2) and anti-loosing nut (3), described gland nut (2) is connected by one-way rotation structure (5) with between regulating ring (4), locate by one-way rotation structure (5) and regulating ring (4) are circumferential towards the gland nut (2) described in when the circumference rotational motion of anti-loosing nut (3) side or movement tendency when gland nut (2) has to rotate relative to regulating ring (4) circumference away from the gland nut (2) described in when the circumference rotational motion of anti-loosing nut (3) side or movement tendency and to have when gland nut (2), the circumferential positioning structure (6) that regulating ring (4) can be made to locate with anti-loosing nut (3) circumference is provided with between described regulating ring (4) and anti-loosing nut (3).
2. the anti-loose mechanical retention mechanism of the many screw pairs of self tightening according to claim 1, it is characterized in that, described one-way rotation structure (5) comprises and is arranged on gland nut (2) one end and the compression helicoid (51) distributed in the shape of a spiral and be arranged on regulating ring (4) one end and the cooperation helicoid (53) distributed in the shape of a spiral, described compression helicoid (51) with compress helicoid (51) and match and form one-way rotation helicoid pair (10).
3. the anti-loose mechanical retention mechanism of the many screw pairs of self tightening according to claim 2, it is characterized in that, formed between described compression helicoid (51) one end and the body of bolt (1) and compress spiral section (54), described cooperation helicoid (53) one end coordinates spiral section (56) with being formed between the body of bolt (1), and compression spiral section (54) described in when gland nut (2) and regulating ring (4) circumference locates with coordinate spiral section (56) energy mutual against.
4. the anti-loose mechanical retention mechanism of the many screw pairs of the self tightening according to Claims 2 or 3, is characterized in that, described compression helicoid (51) is involute helicoid with coordinating helicoid (53).
5. the anti-loose mechanical retention mechanism of the many screw pairs of self tightening according to claim 4, it is characterized in that, described gland nut (2) end is provided with the first involute heliconid (55), and the first described involute heliconid (55) end face forms above-mentioned compression helicoid (51); Described regulating ring (4) end has the second involute heliconid (57) matched with the first involute heliconid (55), and the second described involute heliconid (57) end face forms above-mentioned cooperation helicoid (53).
6. the anti-loose mechanical retention mechanism of the many screw pairs of self tightening according to claim 5, it is characterized in that, the Hand of spiral of described compression helicoid (51) and cooperation helicoid (53) is upper identical with the thread section hand of thread spiral that gland nut (2) is connected with the body of bolt (1).
7. according to the anti-loose mechanical retention mechanism of the many screw pairs of the self tightening described in any one in claim 1-3, it is characterized in that, described circumferential positioning structure (6) comprises and is somely arranged on regulating ring (4) outer circumferential and all along the positioning hole (61) that regulating ring (4) is axially arranged, described anti-loosing nut (3) is provided with at least one matching hole (62) axially arranged along anti-loosing nut (3), described matching hole (62) is with in positioning hole (61), any one is corresponding, and described positioning hole (61) is connected with matching hole (62) by locating column (63).
8. the anti-loose mechanical retention mechanism of the many screw pairs of self tightening according to claim 7, is characterized in that, described matching hole (62) is step hole, and described positioning hole (61) circumference is uniformly distributed setting.
9. the anti-loose mechanical retention mechanism of the many screw pairs of self tightening according to claim 7, is characterized in that, described regulating ring (4) end face and anti-loosing nut (3) end face against.
10. the anti-loose mechanical retention mechanism of the many screw pairs of self tightening according to claim 1 or 2 or 3, it is characterized in that, the described body of bolt (1) is coaxially made up of with the second bolt shank (12) the first bolt shank (11) that diameter is different, and two thread sections are formed on the first bolt shank (11) and the second bolt shank (12) respectively successively, described gland nut (2) is sheathed on the first bolt shank (11), described anti-loosing nut (3) is sheathed on the second bolt shank (12), and the diameter of described the first bolt shank (11) is greater than the diameter of the second bolt shank (12), gland nut (2) screw thread and the corresponding thread section screw thread of the body of bolt (1) form collet threaded pair (8), and anti-loosing nut (3) screw thread and the corresponding thread section screw thread of the body of bolt (1) form anti-loose screw pair (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510628533.9A CN105257665B (en) | 2015-09-29 | 2015-09-29 | The anti-loose mechanical retention mechanism of the more screw pairs of self-tightening type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510628533.9A CN105257665B (en) | 2015-09-29 | 2015-09-29 | The anti-loose mechanical retention mechanism of the more screw pairs of self-tightening type |
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| Publication Number | Publication Date |
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| CN105257665A true CN105257665A (en) | 2016-01-20 |
| CN105257665B CN105257665B (en) | 2018-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510628533.9A Active CN105257665B (en) | 2015-09-29 | 2015-09-29 | The anti-loose mechanical retention mechanism of the more screw pairs of self-tightening type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112722197A (en) * | 2021-01-29 | 2021-04-30 | 启东恒昊船舶科技有限公司 | Screw fastening structure and boats and ships |
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| CN104196865A (en) * | 2014-09-25 | 2014-12-10 | 胡鑫 | Anti-looseness interlocking and fastening device with irregularly-shaped ratchet pad for high-speed-rail contact net |
| CN205101363U (en) * | 2015-09-29 | 2016-03-23 | 玉环胜友工具有限公司 | From locking mechanical fastening mechanism that takes off of many screw pairs of compact form |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5439337A (en) * | 1993-04-12 | 1995-08-08 | Kakimoto; Hiroshi | Lock nut |
| JP2007155113A (en) * | 2005-12-02 | 2007-06-21 | Kimito Fujii | Lock bolt and nut |
| CN201739309U (en) * | 2010-06-08 | 2011-02-09 | 肖长忠 | Novel bolt and nut locking structure |
| CN102705341A (en) * | 2012-06-25 | 2012-10-03 | 中国十七冶集团有限公司 | Left-handed and right-handed rotation nut locking device for large-diameter shaft end |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112722197A (en) * | 2021-01-29 | 2021-04-30 | 启东恒昊船舶科技有限公司 | Screw fastening structure and boats and ships |
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| CN105257665B (en) | 2018-05-25 |
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