CN215567186U - Bolt anti loosening structure for engineering - Google Patents
Bolt anti loosening structure for engineering Download PDFInfo
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- CN215567186U CN215567186U CN202120608578.0U CN202120608578U CN215567186U CN 215567186 U CN215567186 U CN 215567186U CN 202120608578 U CN202120608578 U CN 202120608578U CN 215567186 U CN215567186 U CN 215567186U
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- 230000005540 biological transmission Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 240000008575 Ammannia baccifera Species 0.000 description 1
- 235000001248 Dentaria laciniata Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The utility model provides a bolt anti-loosening structure for engineering, which comprises: the anti-loosening nut with the boss structure, the reverse nut with the boss structure, the bolt with the forward and reverse structures, the anti-loosening internal teeth and the two anti-loosening external teeth; one anti-loose external tooth is embedded into a boss structure of the forward nut with the boss structure to form a first combined structure; the other anti-loose external tooth is embedded into the boss structure of the reverse nut with the boss structure to form a second combined structure; the first combined structure is screwed into the forward thread of the forward and reverse structure bolt; the second combination structure is screwed into the reverse thread of the bolt with the forward and reverse structure and rotates to be in contact with the first combination structure, and the tooth profile of the anti-loosening external teeth of the first combination structure is consistent with that of the anti-loosening external teeth on the second combination structure; the anti-loosening inner teeth are sleeved on the outer sides of the anti-loosening outer teeth of the first combined structure and the anti-loosening outer teeth of the second combined structure and are matched with the tooth profiles of the anti-loosening outer teeth. The utility model solves the problem that the nut is easy to loosen and rotate when the bolt structure is used.
Description
Technical Field
The utility model relates to the field of power transmission and transformation, in particular to a bolt anti-loosening structure for engineering.
Background
At present, the fitting materials such as hardware fittings and iron towers of power transmission and transformation projects are exposed in the atmospheric environment for a long time and are also tested in extreme environments such as wind-induced vibration, galloping, line deicing and the like, the phenomenon that the nut is loosened and rotated when the existing bolt connection structure is used in the complex environment is very common, and the loosening of the nut directly influences the performance of a fastened piece, so that the safe and stable operation of the power transmission and transformation projects is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a bolt anti-loosening structure for engineering, which aims at solving the problem that a nut is easy to loosen and rotate when the existing bolt connecting structure is used in extreme environments such as wind-induced vibration, waving, line deicing and the like, and comprises the following components: the anti-loosening nut comprises a forward nut (1) with a boss structure, a reverse nut (2) with a boss structure, a bolt (5) with a forward and reverse structure, anti-loosening internal teeth (4) and two anti-loosening external teeth (3);
one anti-loose external tooth (3) is embedded into the boss structure of the forward nut (1) with the boss structure to form a first combined structure;
the other anti-loose external tooth (3) is embedded into the boss structure of the reverse nut (2) with the boss structure to form a second combined structure;
the first combined structure is screwed into the forward thread of the forward and reverse structure bolt (5);
the second combined structure is screwed into the reverse thread of the bolt (5) with the forward and reverse structure and rotates to be in contact with the first combined structure, and the anti-loosening external teeth (3) of the first combined structure are consistent with the anti-loosening external teeth (3) on the second combined structure in tooth form;
the anti-loosening inner teeth (4) are sleeved on the outer sides of the anti-loosening outer teeth (3) of the first combined structure and the anti-loosening outer teeth (3) of the second combined structure and are matched with the tooth profiles of the anti-loosening outer teeth (3).
Preferably, the forward nut (1) with the boss structure and the reverse nut (2) with the boss structure both comprise a boss (7) and a nut (8) which are integrally formed; the boss (7) is square, oval or semicircular.
Preferably, the shape of the hollow hole of the anti-loose external teeth (3) is matched with the shape of the boss (7).
Preferably, the tooth profiles of the external anti-loose teeth (3) and the internal anti-loose teeth (4) are triangular, trapezoidal or circular arc.
Preferably, a groove or a bulge (9) is arranged between the boss (7) and the nut (8).
Preferably, the device also comprises a clamp spring (6); the clamp spring (6) is clamped on the groove or the bulge (9).
Preferably, the anti-loosening internal teeth (4) are in a hollow sleeve shape, and a tooth-shaped structure is arranged on the outer side of the sleeve.
Preferably, the diameter of the hollow sleeve is larger than the outer diameter of the anti-slip outer teeth.
Preferably, the anti-loosening internal teeth (4) are composed of two semicircular rings, wherein the top ends and the tail ends of the two semicircular rings are connected through a movable connecting piece.
Preferably, the movable connecting member includes: the pin and/or bolt is rotated.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a bolt anti-loosening structure for engineering, which comprises: the anti-loosening nut with the boss structure, the reverse nut with the boss structure, the bolt with the forward and reverse structures, the anti-loosening internal teeth and the two anti-loosening external teeth; one anti-loose external tooth is embedded into the boss structure of the forward nut with the boss structure to form a first combined structure; the other anti-loose external tooth is embedded into the boss structure of the reverse nut with the boss structure to form a second combined structure; the first combined structure is screwed into the forward thread of the forward and reverse structure bolt; the second combination structure is screwed into the reverse thread of the bolt with the forward and reverse structure and rotates to be in contact with the first combination structure, and the tooth profile of the anti-loosening external teeth of the first combination structure is consistent with that of the anti-loosening external teeth on the second combination structure; the locking internal tooth cup joints the outside of locking external tooth on the locking external tooth of first integrated configuration and the second integrated configuration, and with the profile of tooth looks adaptation of locking external tooth. According to the utility model, the anti-loosening inner teeth are sleeved on the outer sides of the anti-loosening outer teeth, so that the problem that the nut is easy to loosen when the bolt is connected in an extreme environment for use is solved.
The utility model is also provided with the snap spring, so that an integrated structure after the forward nut with the boss structure and the reverse nut with the boss structure are screwed is ensured, and the looseness prevention of the bolt and the nut is realized.
Drawings
Fig. 1 is a schematic view of the overall structure of a bolt looseness prevention structure for engineering in embodiment 1 of the present invention;
fig. 2 is an exploded view of the anti-loosening structure of the engineering bolt of embodiment 1 of the present invention;
fig. 3 is a schematic view of the overall structure of the anti-loosening structure for engineering bolts according to embodiment 2 of the present invention;
fig. 4 is an exploded view of the anti-loosening structure of the engineering bolt of embodiment 2 of the present invention;
fig. 5 is an explosion schematic diagram of the anti-loosening structure of the engineering bolt in the state that the anti-loosening internal teeth of embodiment 2 of the utility model are opened;
FIG. 6 is a schematic structural view of an external loose prevention tooth ring of embodiment 2 of the present invention;
FIG. 7 is a schematic view of a reverse nut with a boss structure according to the present invention;
FIG. 8 is a schematic view of a positive nut of the present invention having a boss configuration;
fig. 9 is an overall schematic view of an anti-loosening structure of an engineering bolt with internal and external loosening prevention teeth arranged in a direction perpendicular to a thread direction in embodiment 2 of the present invention;
FIG. 10 is an exploded view of an anti-loosening structure of an engineering bolt with internal and external loosening prevention teeth arranged in a direction perpendicular to the thread direction in embodiment 2 of the present invention;
FIG. 11 is a schematic structural view of an anti-loose external tooth and anti-loose internal tooth combination of embodiment 2 of the utility model;
fig. 12 is an overall schematic view of a bolt looseness prevention structure for engineering of embodiment 3 of the present invention;
wherein, 1, the positive nut with a boss structure; 2. the reverse nut with the boss structure; 3. anti-loose external teeth; 4. anti-loosening internal teeth; 5. a forward and reverse structural bolt; 6. a clamp spring; 7. a boss; 8. a nut; 9. and (4) protruding.
Detailed Description
In order to solve the problem that when the bolt connecting structure in the prior art is used in a complex environment, a nut is easy to loosen and rotate, various common anti-loosening structure principles are analyzed, the principle of each anti-loosening structure is further understood, and the bolt anti-loosening structure for the power transmission line is provided on the basis.
Example 1:
the utility model provides an anti-loosening structure of a bolt for engineering, which mainly comprises a forward nut 1 with a boss structure, a reverse nut 2 with the boss structure, anti-loosening internal teeth 4, anti-loosening external teeth 3, a clamp spring 6, a bolt 5 with the forward structure and the reverse nut 2 with the boss structure, and the anti-loosening external teeth 3, as shown in fig. 1 and 2.
The combination of the forward nut 1 with the boss structure and the anti-loosening external teeth 3 is also called a first combination structure, the combination of the reverse nut 2 with the boss structure and the anti-loosening external teeth 3 is also called a second combination structure, and the first combination structure and the second combination structure can be integrally formed or can be two parts which are tightly combined together. The forward nut 1 with the boss structure comprises a boss 7 and a nut 8 which are integrally formed, as shown in fig. 8;
the reverse nut 2 with the boss structure can also be provided with a bulge 9 between the boss 7 and the nut 8, and the boss 7, the bulge 9 and the nut 8 are integrally formed as shown in FIG. 7;
the clamp spring 6 is clamped on the bulge 9.
The boss 7 can be designed into a square, oval, semicircular and other structures; the shape of the hollow hole of the anti-loosening external teeth 3 can be designed into a square, oval, semicircular and other structures; the shape of the hollow hole of the anti-loose external teeth 3 is matched with the shape of the boss 7. The locking internal tooth 4 in this embodiment is a circular ring structure, and teeth are arranged along the inner side of the circular ring, and the inner diameter of the circular ring is larger than the maximum outer diameter of the reverse nut 2 with the boss structure. Teeth are provided along the outer side of the anti-loose outer teeth 3. The teeth of the anti-loosening internal teeth 4 and the anti-loosening external teeth 3 can be set as circumferential teeth, the shapes of the teeth can be designed into a triangle, a trapezoid, a circular arc and the like, the two teeth are matched, and the triangle is taken as an example in the embodiment, as shown in fig. 1.
Firstly, the anti-loose external teeth 3 are embedded into the positive nut 1 with the boss structure to form an integrated combined structure of the positive nut 1 with the boss structure and the anti-loose external teeth 3, the integrated combined structure is called as a first combined structure, and the first combined structure is screwed into the positive thread of the bolt 5 with the positive and negative structure to realize the matching with a fastening body; locking external tooth 3 is embedded into takes boss structure reverse nut 2 in, forms and takes boss structure reverse nut 2 and the integrative integrated configuration of locking external tooth 3, and this integrative integrated configuration is called second integrated configuration, and the closely contacting cooperation with first integrated configuration is guaranteed to the reverse screw thread department of second integrated configuration screw in forward and reverse structure bolt 5. The small adjustment of spanner is passed through in the contact process, realize the dentiform correspondence of locking external tooth 3 in the first integrated configuration and the second integrated configuration, reverse nut 2 of boss structure is taken to the rethread falls into locking internal tooth 4 on locking external tooth 3 in the first integrated configuration and the second integrated configuration, realize locking internal tooth 4 and the cooperation of locking external tooth 3, 6 joints of jump ring are setting up and boss 7 and the protruding 9 department between the nut 8 at last, the integrative structure after having boss structure forward nut 1 and taking boss structure reverse nut 2 to screw up has been guaranteed, thereby realized that the bolt structure uses the easy not hard up problem of gyration of nut in the use.
The installation sequence in this embodiment is in turn: screwing the first combination structure into the forward thread of the forward and reverse structure bolt 5 to realize the matching with a fastening body, screwing the second combination structure into the reverse thread of the forward and reverse structure bolt 5 to ensure the close contact matching with the first combination structure, and realizing the correspondence of the tooth shapes of the anti-loosening external teeth 3 of the first combination structure and the second combination structure through the micro adjustment of a spanner in the contact process, and then dropping the anti-loosening internal teeth 4 into the outer sides of the anti-loosening external teeth 3 of the second combination structure and the anti-loosening external teeth 3 of the first combination structure through the reverse nut 2 with the boss structure so as to ensure that the teeth of the anti-loosening internal teeth 4 are matched with the teeth of the anti-loosening external teeth 3; and finally, the clamp spring 6 is opened into the groove by the bulge 9 of the reverse nut 2 with the boss structure or the bulge 9 of the forward nut 2 with the boss structure, so that an integrated structure after the forward nut 1 with the boss structure and the reverse nut 2 with the boss structure are screwed is ensured.
Example 2:
the utility model provides an anti-loosening structure of a bolt for engineering, which mainly comprises a forward nut 1 with a boss structure, a reverse nut 2 with a boss structure, anti-loosening internal teeth 4, anti-loosening external teeth 3, a clamp spring 6, a bolt 5 with a forward and reverse structure, a combination of the forward nut 1 with a boss structure and the anti-loosening external teeth 3, and a combination of the reverse nut 2 with a boss structure and the anti-loosening external teeth 3, as shown in fig. 3, 4 and 5.
The forward nut 1 with the boss structure and the reverse nut 2 with the boss structure both comprise a boss 7 and a nut 8 which are integrally formed;
the boss 7 can be designed into a square, oval, semicircular and other structures; the shape of the hollow hole of the anti-loosening external teeth 3 can be designed to be square, oval, semicircular and the like; wherein the boss 7 is matched with the hollow hole of the anti-loose external teeth 3.
Locking internal tooth 4 in this embodiment is the ring structure that two semicircles constitute, and two semicircular structure pass through swing joint spare and connect, are provided with the tooth along the ring structure inboard, and the external diameter of the internal diameter more than or equal to locking external tooth 3 of ring structure. The teeth are arranged on the outer side of the anti-loose outer teeth 3, the teeth of the anti-loose inner teeth 4 and the anti-loose outer teeth 3 can be provided with a plurality of groups of annular teeth, the annular teeth can be full circles as shown in fig. 6, also can be half circle structures, also can be provided with a plurality of sections of circumferential teeth, as shown in fig. 9 and 10, the shapes of the teeth can be designed into structures such as triangles, trapezoids and circular arcs, and the two are matched. In the present embodiment, the inner anti-loose teeth 4 and the outer anti-loose teeth 3 are provided with triangular circumferential teeth adapted to each other, as shown in fig. 11.
A groove or a bulge 9 is arranged on any one or both of the reverse nut 2 with the boss structure and the forward nut 1 with the boss structure; in the embodiment, the reverse nut 2 with the boss structure is provided with the protrusion 9, as shown in fig. 7, the protrusion 9 is positioned between the boss 7 and the nut 8, and the three are integrally formed.
Firstly, the anti-loose external teeth 3 are embedded into the positive nut 1 with the boss structure to form an integrated combined structure of the positive nut 1 with the boss structure and the anti-loose external teeth 3, the integrated combined structure is called as a first combined structure, and the first combined structure is screwed into the positive thread of the bolt 5 with the positive and negative structure to realize the matching with a fastening body; locking external tooth 3 is embedded into takes boss structure reverse nut 2 in, forms and takes boss structure reverse nut 2 and the integrative integrated configuration of locking external tooth 3, and this integrative integrated configuration is called second integrated configuration, and the closely contacting cooperation with first integrated configuration is guaranteed to the reverse screw thread department of second integrated configuration screw in forward and reverse structure bolt 5. The contact in-process is through the small adjustment of spanner, realizes taking the profile of tooth of boss structure forward nut 1 and the locking external tooth 3 of taking boss structure reverse nut 2 to correspond, and on directly the joint of two semicircles of locking internal tooth 4 realized locking internal tooth 4 and locking external tooth 3 of first integrated configuration and second integrated configuration again on. Finally, the clamp spring 6 is clamped on the bulge 9, so that an integrated structure after the forward nut 1 with the boss structure and the reverse nut 2 with the boss structure are screwed is guaranteed, and looseness prevention of the bolt 5 with the forward nut 1 with the boss structure and the reverse nut 2 with the boss structure is achieved.
Example 3:
the utility model provides an anti-loosening structure of a bolt for engineering, which mainly comprises a forward nut 1 with a boss structure, a reverse nut 2 with a boss structure, anti-loosening internal teeth 4, anti-loosening external teeth 3, a bolt 5 with a forward and reverse structure, a combination of the forward nut with the boss structure and the anti-loosening external teeth 3, and a combination of the reverse nut 2 with the boss structure and the anti-loosening external teeth 3, as shown in figure 12.
The forward nut 1 with the boss structure and the reverse nut 2 with the boss structure both comprise a boss 7 and a nut 8 which are integrally formed. The boss 7 can be designed into a square, oval, semicircular and other structures; the shape of the hollow hole of the anti-loosening external teeth 3 can be designed to be square, oval, semicircular and the like; wherein, the shape of the boss 7 is matched with the shape of the hollow hole of the anti-loosening external tooth 3.
The anti-loosening inner teeth 4 are a circular ring formed by two semicircles which are connected through a movable connecting piece. The movable connecting piece can be two rotating pin shafts, one rotating pin shaft and one bolt, and can also be two bolts.
When being two rotatory round pin axles, pass through rotatory round pin axle fixed connection at two semicircle both ends, when the in-service use, earlier with two semicircle joints in the outside of locking external tooth 3, then through rotatory round pin axle with two semicircle fixed connection, also can pass through rotatory round pin axle fixed connection with the one end of two semicircles earlier, then behind 3 external teeth of locking external tooth at two semicircle joints, pass through rotatory round pin axle fixed connection with the other end of two semicircles again, confirm the order that two semicircle both ends are connected with the convenience of operation in the actual engineering.
When being a rotatory round pin axle, during a bolt, earlier pass through rotatory round pin hub connection with two semicircles, then with two semicircle joints in the outside of locking external tooth 3, pass the bolt hole that sets up on two semicircle other ends with the bolt afterwards, realize fixed connection, as shown in fig. 12.
When being two bolts, need all set up the bolt hole at the both ends of two semicircles for through two semicircles of bolt fastening. Can pass through the bolt fastening with the one end of these two semicircles earlier, then with two semicircle joints behind locking outer tooth 3 outsides, the rethread bolt is fixed with the other end of two semicircles. Also can be with two semicircle joints behind locking outer tooth 3 outsides, rotate into the bolt hole with two bolts in proper order again, with two semicircle fixed connection.
The teeth of the anti-loosening internal teeth 4 and the anti-loosening external teeth 3 can be arranged into a plurality of sections of circumferential teeth, and the tooth shapes can be designed into a triangle, a trapezoid, a circular arc and the like which are matched with each other. In this embodiment, the ends of the two semicircular rings are movably connected through a rotating pin shaft, and the top ends of the two semicircular rings are provided with bolt holes for fixing and are fixed through bolts, as shown in fig. 12. At least one section of the two semi-circles is provided with anti-skid inner teeth in a triangular shape, a trapezoidal shape or a circular arc shape, and in the embodiment, two sections of teeth are taken as an example, as shown in fig. 12.
Firstly, the anti-loose external teeth 3 are embedded into the positive nut 1 with the boss structure to form an integrated combined structure of the positive nut 1 with the boss structure and the anti-loose external teeth 3, the integrated combined structure is called as a first combined structure, and the first combined structure is screwed into the positive thread of the bolt 5 with the positive and negative structure to realize the matching with a fastening body; locking external tooth 3 is embedded into takes boss structure reverse nut 2 in, forms and takes boss structure reverse nut 2 and the integrative integrated configuration of locking external tooth 3, and this integrative integrated configuration is called second integrated configuration, and the closely contacting cooperation with first integrated configuration is guaranteed to the reverse screw thread department of second integrated configuration screw in forward and reverse structure bolt 5. The contact in-process is through the small adjustment of spanner, realizes the tooth form correspondence of locking outer tooth 3 on the first integrated configuration and the locking outer tooth 3 on the second integrated configuration, again with two semicircle joints of locking inner tooth 4 in the 3 outsides of locking outer tooth to pass the bolt hole of two semicircle tip through the bolt and fall into locking inner tooth 4 and have boss structure forward nut 1 and have boss structure reverse nut 2 on locking outer tooth 3.
Can also add jump ring 6 in this embodiment, this jump ring 6 has guaranteed to take lug boss structure forward nut 1 and take lug boss structure reverse nut 2 to screw up the integrative structure after through setting up in the protruding 9 open-slot between boss 7 and nut 8 to the locking of bolt and nut has been realized.
When all being provided with arch 9 on taking lug boss structure forward nut 1 and taking lug boss structure reverse nut 2, the quantity of jump ring 6 is 2, when only having a arch 9, the quantity of jump ring is 1, and the quantity of jump ring 6 is unanimous with protruding 9's quantity.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (10)
1. The utility model provides a bolt anti loosening structure for engineering which characterized in that includes: the anti-loosening nut comprises a forward nut (1) with a boss structure, a reverse nut (2) with a boss structure, a bolt (5) with a forward and reverse structure, anti-loosening internal teeth (4) and two anti-loosening external teeth (3);
one anti-loose external tooth (3) is embedded into the boss structure of the forward nut (1) with the boss structure to form a first combined structure;
the other anti-loose external tooth (3) is embedded into the boss structure of the reverse nut (2) with the boss structure to form a second combined structure;
the first combined structure is screwed into the forward thread of the forward and reverse structure bolt (5);
the second combined structure is screwed into the reverse thread of the bolt (5) with the forward and reverse structure and rotates to be in contact with the first combined structure, and the anti-loosening external teeth (3) of the first combined structure are consistent with the anti-loosening external teeth (3) on the second combined structure in tooth form;
the anti-loosening inner teeth (4) are sleeved on the outer sides of the anti-loosening outer teeth (3) of the first combined structure and the anti-loosening outer teeth (3) of the second combined structure and are matched with the tooth profiles of the anti-loosening outer teeth (3).
2. The anti-loosening structure for engineering bolts as claimed in claim 1, wherein the forward nut (1) with boss structure and the reverse nut (2) with boss structure each comprise a boss (7) and a nut (8) which are integrally formed; the boss (7) is square, oval or semicircular.
3. The anti-loosening structure for engineering bolts according to claim 2, wherein the shape of the hollow hole of the anti-loosening external teeth (3) is matched with the shape of the boss (7).
4. The anti-loosening structure of the engineering bolt as claimed in claim 3, wherein the tooth profiles of the external anti-loosening teeth (3) and the internal anti-loosening teeth (4) are set to be triangular, trapezoidal or circular arc.
5. The anti-loosening structure for engineering bolts as claimed in claim 2, characterized in that a groove or a protrusion (9) is provided between the boss (7) and the nut (8).
6. The anti-loosening structure for engineering bolts as claimed in claim 5, further comprising a snap spring (6); the clamp spring (6) is clamped on the groove or the bulge (9).
7. The anti-loosening structure for engineering bolts according to claim 1, wherein the anti-loosening internal teeth (4) are in the shape of a hollow sleeve, and a tooth-shaped structure is provided on the outer side of the sleeve.
8. The anti-loosening structure for engineering bolts according to claim 7, wherein the diameter of the hollow sleeve is larger than the outer diameter of the anti-slip outer teeth.
9. The anti-loosening structure for engineering bolts according to claim 1, wherein the anti-loosening internal teeth (4) are composed of two semicircular rings, wherein the top ends and the tail ends of the two semicircular rings are connected by a movable connecting piece.
10. The anti-loosening structure for engineering bolts according to claim 9, wherein the movable connecting member comprises: the pin and/or bolt is rotated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120608578.0U CN215567186U (en) | 2021-03-25 | 2021-03-25 | Bolt anti loosening structure for engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120608578.0U CN215567186U (en) | 2021-03-25 | 2021-03-25 | Bolt anti loosening structure for engineering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215567186U true CN215567186U (en) | 2022-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120608578.0U Active CN215567186U (en) | 2021-03-25 | 2021-03-25 | Bolt anti loosening structure for engineering |
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| Country | Link |
|---|---|
| CN (1) | CN215567186U (en) |
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2021
- 2021-03-25 CN CN202120608578.0U patent/CN215567186U/en active Active
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