A steel wire screw based anti-loose fastening structure

Abstract

The application discloses a kind of based on steel wire sleeve anti-loose fastening structure, including base body and steel wire sleeve, the inside of the steel wire sleeve is equipped with the bolt of thread adaptation, the inside of the base body is equipped with with the steel wire sleeve thread adaptation outer guide inclined layer and internal thread hole, the inside of the steel wire sleeve is equipped with with the bolt thread adaptation wedge-shaped inclined layer and inner guide inclined layer;The application is connected with the integration of splice ring by steel wire sleeve, to form auxiliary fastening structure, not only easy to cooperate with tool and embed steel wire sleeve into base body for preset positioning, and under the recess surface guidance of expansion steel ring and conical concave layer, it is convenient to let bolt stable with the wedge-shaped inclined layer and inner guide inclined layer of steel wire sleeve inside surface thread engagement, simultaneously under the inclined plane thread structure of wedge-shaped inclined layer and inner guide inclined layer composition, to eliminate the error relaxation between pitch and tooth shape between internal and external thread.

Description

Technical Field

[0001] This invention relates to the field of wire thread insert technology, specifically to an anti-loosening fastening structure based on wire thread inserts. Background Technology

[0002] Wire thread inserts are a new type of internal thread fastener suitable for threaded connections. They are screwed into and fastened in the threaded hole of one of the connected parts to form a standard internal thread. Bolts (or screws) are then screwed into them. Also known as threaded inserts or simply inserts, they are spring-shaped concentric bodies with internal and external threads, precisely machined from high-strength, high-precision, and smooth-surfaced cold-rolled diamond-shaped stainless steel wire. They are mainly used to reinforce and protect the internal threads of low-strength materials.

[0003] The authorized patent number CN220185581U discloses a fastening structure based on a wire thread insert. The wire thread insert mainly forms an anti-loosening structure with radial pressure greater than axial pressure after the wire thread insert is installed through the bottom hole of the base of the fastening structure. At the same time, the bolt can also form an anti-loosening structure with radial pressure greater than axial pressure after installation. This can improve the bonding force between the wire thread insert and the base, as well as the bonding force between the bolt and the wire thread insert, thereby improving the connection strength of the entire fastening mechanism and making it less prone to loosening.

[0004] The authorized patent number CN208919029U discloses an easy-to-maintain wire thread insert. This insert utilizes a guide groove created by a guide wire to facilitate the periodic infiltration of protective fluid into the inner and outer rings of the wire thread insert body, effectively preventing oxidation and rust, thus extending its service life. A T-shaped rod is inserted into a cavity inside the wire thread insert body, allowing for easy disassembly by rotating the T-shaped rod, eliminating the need for specialized disassembly tools and facilitating maintenance. However, in actual use, the following drawbacks still exist:

[0005] The aforementioned patent mainly utilizes fastening and guiding structures to achieve the fixed connection and maintenance of wire thread inserts. However, during the actual splicing of wire thread inserts, tools are often required to embed the insert into the splicing hole. During this process, the tools will cause friction on the inner threaded surface of the insert during disassembly and assembly. As the force varies, the wear on the insert will gradually increase, affecting the engagement force between the insert and the bolt thread, reducing the stability and service life of the actual thread splicing of the insert. Summary of the Invention

[0006] The purpose of this invention is to provide an anti-loosening fastening structure based on wire thread inserts to solve the related problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a non-loosening fastening structure based on a wire thread insert, comprising a base and a wire thread insert, wherein a threaded bolt is fitted on the inner side of the wire thread insert, and an outer guide inclined layer and an inner threaded hole adapted to the thread of the wire thread insert are provided on the inner side of the base, and a wedge-shaped inclined layer and an inner guide inclined layer adapted to the thread of the bolt are provided on the inner side of the wire thread insert;

[0008] The top of the wire thread sleeve is provided with an integrated expansion steel ring, and the top of the expansion steel ring is provided with a connecting section. A splicing ring is welded to the top of the connecting section. The inner side of the expansion steel ring is provided with a conical concave layer with a concave structure. The splicing ring has an opening inside and four sets of slots inside.

[0009] Preferably, the wire threaded sleeve is prefabricated into a wire threaded sleeve shape by rolling a round steel wire through a roller, and the expanded steel ring is prefabricated into a steel ring shape with an inner diameter larger than that of the threaded sleeve by rolling a round steel wire through a roller, and the threaded sleeve and the steel ring are integrated and connected.

[0010] Preferably, the threaded sleeve and the steel ring of the wire threaded sleeve are precision drawn by perforating the diameter steel wire using a drawing process, so that the cross section of the diameter steel wire is precision drawn into a wedge-shaped inclined steel wire of 30° to 35°.

[0011] Preferably, the bottom of the outer side of the splicing ring has a conical structure, and the top of the substrate has a conical groove, which is fitted and positioned to fit the splicing ring.

[0012] Preferably, a washer is provided on the top of the outer side of the bolt, and the washer is sealed and fitted to the top of the base.

[0013] Preferably, the inner side of the conical concave layer is provided with a wear-resistant layer, the conical concave layer is larger than the inner diameter of the wire thread sleeve, and the through-hole, the conical concave layer and the wire thread sleeve are on the same vertical plane.

[0014] Preferably, the inner guide inclined layer is threaded with the bolt and connected to the wedge-shaped inclined layer for anti-loosening, and the inner threaded hole is adapted to the outer thread of the wire thread sleeve and connected to the outer guide inclined layer for anti-loosening.

[0015] Preferably, the inner side of the four sets of grooves is provided with a rubber anti-slip layer, and the four sets of grooves are opened on the inner wall of the opening.

[0016] Preferably, the wire thread insert adopts a 30° to 35° wedge-shaped inclined surface thread, and the crest of the bolt rests on the wedge-shaped inclined layer inside the wire thread insert.

[0017] Preferably, when the wire thread insert is annealed, the steel part is placed in the furnace for cooling to eliminate the residual internal stress caused by cold working. At the same time, stress-relief annealing can eliminate internal stress, improve dimensional stability, prevent deformation and cracking of the workpiece, and complete the heat treatment of the thread insert.

[0018] Compared with the prior art, the present invention provides an anti-loosening fastening structure based on wire thread inserts, which has the following beneficial effects:

[0019] 1. This invention forms an auxiliary fastening structure by integrating a wire thread insert with a splicing ring. This not only facilitates the insertion of the wire thread insert into the base for pre-positioning with the help of tools, but also allows the bolt to stably engage with the wedge-shaped inclined layer and the inner guide inclined layer of the wire thread insert under the guidance of the concave surface of the expansion steel ring and the concave layer. At the same time, the inclined thread structure formed by the wedge-shaped inclined layer and the inner guide inclined layer eliminates the error and relaxation between the pitch and tooth profile of the internal and external threads, and can evenly distribute the load on each thread over a specified length, improving the stability of the thread insert fastening connection, preventing the bolt from moving laterally relative to the thread insert, and avoiding loosening caused by vibration.

[0020] 2. This invention utilizes the fitting and positioning of the splicing ring and the pre-set notch to allow the threaded sleeve to be stably embedded in the base body within the conical ring structure, improving the stability of the bolt and wire threaded sleeve mating connection. Furthermore, the welding of the connecting section to the splicing ring promotes an integrated connection between the wire threaded sleeve and the splicing ring, thereby uniformly resisting and dissipating vibrations caused by the lateral movement of the threaded sleeve, and absorbing vibrations, thus improving the connection strength and fatigue resistance of the thread. Simultaneously, the pre-set four sets of slots facilitate the clamping of tools with the splicing ring to mate the wire threaded sleeve, eliminating the need for direct contact installation of the threaded section of the wire threaded sleeve in existing structures, avoiding damage to the thread structure during frequent disassembly and assembly of the threaded sleeve, and extending the service life of the fastening structure. Attached Figure Description

[0021] Figure 1 This is a front sectional view of the present invention;

[0022] Figure 2 This is a cross-sectional view of the bolt-wire threaded sleeve connection structure of the present invention;

[0023] Figure 3 This is a perspective view of the wire thread sleeve of the present invention;

[0024] Figure 4 This is a perspective view of the splicing ring of the present invention;

[0025] Figure 5 For the present invention Figure 2 Enlarged view of point A.

[0026] In the diagram: 1. Matrix; 2. Wire thread insert; 3. Splicing ring; 4. Bolt; 5. Groove; 6. Connecting section; 7. Expanding steel ring; 8. Conical concave layer; 9. Through port; 10. Wedge-shaped inclined layer; 11. Inner guide inclined layer; 12. Outer guide inclined layer; 13. Internal threaded hole. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-5 The present invention provides a technical solution: a fastening structure based on a wire thread sleeve, comprising a base 1 and a wire thread sleeve 2, wherein a threaded bolt 4 is fitted on the inner side of the wire thread sleeve 2, and an outer guide inclined layer 12 and an inner threaded hole 13 adapted to the thread of the wire thread sleeve 2 are provided on the inner side of the base 1, and a wedge-shaped inclined layer 10 and an inner guide inclined layer 11 adapted to the thread of the bolt 4 are provided on the inner side of the wire thread sleeve 2.

[0029] The top of the wire thread insert 2 is provided with an integrated expansion steel ring 7, and the top of the expansion steel ring 7 is provided with a connecting section 6. The top of the connecting section 6 is welded with a splicing ring 3. The inner side of the expansion steel ring 7 is provided with a conical concave layer 8 with a concave structure. The splicing ring 3 has an opening 9 inside and four sets of slots 5 inside. The slots 5 facilitate the connection between the tool and the slots 5 to form a clamp. At this time, the tool mainly uses the contact of the splicing ring 3 to embed and assemble the wire thread insert 2, thereby avoiding direct friction damage to the wire thread insert 2 and improving the disassembly function of the fastening structure.

[0030] The wire thread insert 2 is prefabricated into the shape of a wire thread insert by rolling a round steel wire through a roller. The expansion steel ring 7 is prefabricated into the shape of a steel ring with an inner diameter larger than that of the thread insert by rolling a round steel wire through a roller, and the thread insert and the steel ring are connected as a whole.

[0031] As a preferred embodiment, the threaded sleeve and steel ring of the wire threaded sleeve 2 are precision drawn by perforating the diameter steel wire using a drawing process, so that the cross section of the diameter steel wire is precision drawn into a wedge-shaped inclined steel wire of 30° to 35°. The wedge-shaped inclined angle of the threaded sleeve structure is produced to meet the qualified standard of 30° to 35° through the drawing process.

[0032] As a preferred embodiment, the bottom of the outer side of the splicing ring 3 is tapered, and the top of the base 1 is provided with a tapered groove. The tapered groove fits and is positioned with the splicing ring 3. By utilizing the opening and matching of the tapered groove, it can be used as a prefabricated structure to be opened at the position where the screw sleeve needs to be assembled, which facilitates the secondary splicing and calibration positioning of the screw sleeve and improves the stability of the screw sleeve after assembly.

[0033] As a preferred embodiment, a washer is provided on the top of the outer side of the bolt 4, and the washer is sealed and fitted to the top of the base 1, which promotes the sealing effect of the washer on the threaded sleeve and the assembly position, and prevents external dust from seeping into the gap.

[0034] As a preferred embodiment, the inner side of the conical concave layer 8 is provided with a wear-resistant layer. The conical concave layer 8 is larger than the inner diameter of the wire thread sleeve 2. The through-hole 9, the conical concave layer 8, and the wire thread sleeve 2 are on the same vertical plane. The conical concave layer 8 is used to guide the connected thread sleeve, and with the cooperation of the wear-resistant layer, the wear resistance and service life of the conical concave layer 8 are improved.

[0035] As a preferred embodiment, the inner guide inclined layer 11 is threadedly engaged with the bolt 4 and is anti-loosened by the wedge-shaped inclined layer 10. The inner threaded hole 13 is adapted to the outer thread of the wire thread sleeve 2 and is anti-loosened by the outer guide inclined layer 12. The connection between the inner and outer inclined threads is improved to enhance the stability of the connection between the thread sleeve and the bolt 4.

[0036] As a preferred embodiment, the inner side of the four sets of slots 5 is provided with a rubber anti-slip layer, and the four sets of slots 5 are opened on the inner wall of the opening 9 to increase the anti-slip effect of the inner side of the slots 5.

[0037] As a preferred embodiment, the wire thread insert 2 adopts a 30° to 35° wedge-shaped inclined surface thread, and the crest of the bolt 4 is located at the wedge-shaped inclined layer 10 on the inner side of the wire thread insert 2, which improves the stability and anti-loosening effect of the inclined surface thread connection between the bolt 4 and the wire thread insert 2.

[0038] In Example 1, the wire thread insert 2 utilizes a drawing process to precisely draw the diameter steel wire through a hole, causing the cross-section of the diameter steel wire to be precisely drawn into a wedge-shaped inclined steel wire of 30° to 35°. This results in the cross-section of the wound steel wire having a 30° to 35° inclined feature, forming a specially designed threaded sleeve structure. This allows the wire thread insert to be embedded in the threaded hole of low-strength engineering materials such as aluminum, magnesium alloy, cast iron, fiberglass, and plastic, forming a high-precision internal thread that conforms to international standards. It has high connection strength, vibration resistance, impact resistance, and wear resistance.

[0039] In Example 2, the wire thread insert 2 is prefabricated into the shape of a diameter wire thread insert by rolling a round steel wire through a roller. The expansion steel ring 7 is prefabricated into the shape of a steel ring with an inner diameter larger than that of the thread insert by rolling a round steel wire through a roller, and the thread insert and the steel ring are integrated and connected. Using a drawing process, the diameter wire is perforated and finely drawn, so that the cross section of the diameter wire is finely drawn into a wedge-shaped inclined steel wire of 30° to 35°, preferably 30°, and the actual deviation does not exceed 35°, so that the inner side of the wire thread insert 2 is in the form of a wedge-shaped inclined thread, which contacts and is fixed with the bolt tooth crest.

[0040] Working principle: In the anti-loosening fastening structure of this wire thread insert;

[0041] When the wire thread insert 2 is manufactured through the wire drawing process, it can be integrated with the wire thread insert 2 by means of an inner diameter larger than that of the expansion steel ring 7. A connecting section 6 is set to be combined with the splicing ring 3 to form an integrated fastening thread insert structure. During the insertion of the thread insert into the base 1, the base 1 is pre-fitted with the splicing ring 3 structure and has a locking groove. When the splicing ring 3 is inserted into the base 1, the structure of the splicing ring 3 and the locking groove fits together, naturally calibrating and positioning the assembly point of the wire thread insert 2. In this state, the bolt 4 is threaded to the wedge-shaped inclined layer 10 and the inner guide inclined layer 11 on the inner side of the wire thread insert 2. Under the threaded method of the wedge-shaped inclined surface, it is ensured that the splicing of the wire thread insert 2 will not loosen or shift position, and the wire thread insert 2 will not loosen due to lateral displacement and vibration of the threaded connection. The bolt is firmly positioned under the cooperation of this fastening structure.

[0042] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A fastening structure based on a wire thread insert for preventing loosening, characterized in that: It includes a base (1) and a wire thread sleeve (2). The inner side of the wire thread sleeve (2) is fitted with a threaded bolt (4). The inner side of the base (1) is provided with an outer guide inclined layer (12) and an inner threaded hole (13) that are threaded to the wire thread sleeve (2). The inner side of the wire thread sleeve (2) is provided with a wedge-shaped inclined layer (10) and an inner guide inclined layer (11) that are threaded to the bolt (4). The top of the wire thread sleeve (2) is provided with an integrally connected expansion steel ring (7), and the top of the expansion steel ring (7) is provided with a connecting section (6). The top of the connecting section (6) is welded with a splicing ring (3). The inner side of the expansion steel ring (7) is provided with a conical concave layer (8) with a concave structure. The splicing ring (3) has an opening (9) inside and four sets of slots (5) inside.

2. The anti-loosening fastening structure based on wire thread insert according to claim 1, characterized in that: The wire thread sleeve (2) is prefabricated into a wire thread sleeve shape by rolling a round wire through a roller. The expansion steel ring (7) is prefabricated into a steel ring shape with an inner diameter larger than the thread sleeve by rolling a round wire through a roller, and the thread sleeve and the steel ring are connected as a whole.

3. The anti-loosening fastening structure based on wire thread sleeve according to claim 2, characterized in that: The threaded sleeve (2) and the steel ring of the wire threaded sleeve (2) are precision drawn by piercing the diameter steel wire using a drawing process, so that the cross section of the diameter steel wire is precision drawn into a wedge-shaped inclined steel wire of 30° to 35°.

4. The anti-loosening fastening structure based on wire thread insert according to claim 1, characterized in that: The bottom of the outer side of the splicing ring (3) has a conical structure, and the top of the base (1) has a conical groove, which fits and is positioned with the splicing ring (3).

5. The anti-loosening fastening structure based on wire thread insert according to claim 1, characterized in that: A washer is provided on the top of the outer side of the bolt (4), and the washer is sealed and fitted to the top of the base (1).

6. The anti-loosening fastening structure based on wire thread insert according to claim 1, characterized in that: The inner side of the conical concave layer (8) is provided with a wear-resistant layer. The conical concave layer (8) is larger than the inner diameter of the wire thread sleeve (2). The through-hole (9), the conical concave layer (8), and the wire thread sleeve (2) are on the same vertical plane.

7. The anti-loosening fastening structure based on wire thread insert according to claim 1, characterized in that: The inner guide inclined layer (11) is threadedly engaged with the bolt (4) and is anti-loosened connected to the wedge-shaped inclined layer (10). The inner threaded hole (13) is adapted to the outer thread of the wire thread sleeve (2) and is anti-loosened connected to the outer guide inclined layer (12).

8. The anti-loosening fastening structure based on wire thread insert according to claim 1, characterized in that: The inner side of the four sets of grooves (5) is provided with a rubber anti-slip layer, and the four sets of grooves (5) are opened on the inner wall of the opening (9).

9. The anti-loosening fastening structure based on wire thread insert according to claim 1, characterized in that: The wire thread insert (2) adopts a 30° to 35° wedge-shaped inclined surface thread form, and the crest of the bolt (4) is located at the wedge-shaped inclined layer (10) inside the wire thread insert (2).

10. The anti-loosening fastening structure based on wire thread insert according to claim 1, characterized in that: When the wire thread insert (2) is annealed, the steel part is placed in the furnace for cooling to eliminate the residual internal stress caused by cold working. At the same time, stress-relief annealing can eliminate internal stress, improve dimensional stability, prevent deformation and cracking of the workpiece, and complete the heat treatment of the thread insert.

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