CN112727889A

CN112727889A - Anti-convolution screw and nut combination

Info

Publication number: CN112727889A
Application number: CN202011597182.7A
Authority: CN
Inventors: 沈纪伟; 谢秀华
Original assignee: Hangzhou Shendaxia Decoration Design Engineering Co ltd
Current assignee: Fujian Huagai Machinery Manufacture Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-04-30
Anticipated expiration: 2040-12-28
Also published as: CN112727889B

Abstract

The invention discloses an anti-convolution screw and nut combination, which aims to provide an anti-convolution screw and nut combination which is convenient to use, can be used for directly manufacturing an anti-convolution structure on a screw and a nut, can be produced in batches, and can be used for preventing convolution and loosening by matching the screw and the nut during use, and comprises a screw head, a threaded rod and a nut, wherein the threaded rod is provided with an elastic anti-convolution structure; when the screw revolves due to manual disassembly or vibration, the elastic tooth top is embedded into the blocking groove, so that the screw cannot be disassembled or revolves loosely.

Description

Anti-convolution screw and nut combination

Technical Field

The invention relates to the field of hardware tools for connecting and fixing, in particular to an anti-convolution screw and nut combination.

Background

At present, most of fixing modes of parts in a plurality of products are screws and nuts or screw holes or fixing screws which are directly arranged at corresponding positions of the parts for fastening, particularly, in the continuous use process of screws with the thread pitches of 3 mm and above, the screws and the nuts gradually rotate and loosen, but parts connected by the screws of some products are expected to be never loosened, and the conventional anti-rotation screws generally adopt additional accessories to limit the loosening and rotation of the screws or the nuts.

The anti-loose screw assembly disclosed in the Chinese patent document has the publication number of CN107575463A, and consists of a long screw and a hollow screw; the long screw is provided with a first external thread; the hollow screw is sleeved on the long screw and is provided with a second external thread; the rotation directions of the first external thread and the second external thread are opposite; the first and second connection parts are fixed together by long and cannulated screws. Under the condition of impact and vibration, the hollow screw has a tendency of loosening, and the loosening of the hollow screw is opposite to the screwing direction of the long screw, so that the long screw is screwed up through the contact surface of the hollow screw and the head of the long screw, and the anti-loosening screw group cannot loosen. However, the structure of the anti-loosening screw assembly is complex, so that the anti-loosening screw assembly has the defects that the screw holes need to be reamed and are matched with each other to be manufactured, and inconvenience is brought to mass manufacturing and actual use.

Disclosure of Invention

The invention aims to overcome the defects that the conventional anti-convolution screw with the pitch equal to or larger than 3 mm is inconvenient to manufacture in large batch and use in practice because the screw hole needs to be reamed and manufactured in a matched manner. The anti-convolution screw and nut combination is convenient to use, can be used for directly manufacturing anti-convolution structures on a screw and a nut, can be produced in batches, and can be used for preventing convolution and loosening through the matching of the screw and the nut during use.

In order to solve the technical problems, the invention adopts the following technical scheme: the anti-rotation nut comprises a screw head, a threaded rod and a nut, wherein at least one group of elastic anti-rotation structures are arranged at the longitudinal position of the threaded rod, each elastic anti-rotation structure consists of a first groove, a second groove and an elastic anti-rotation rack, a tooth crest protruding out of the outer diameter of the thread is formed at the intersection of the tooth crest of the anti-rotation rack and the first groove, the pointed direction of the top of the tooth crest is opposite to the screwing direction of the thread, a rear tooth crest is formed at the intersection of the outer diameter of the anti-rotation rack and the second groove, the rear tooth crest is contacted with the second groove, and at least 1 blocking groove is formed in the nut; this scheme structure can effectually prevent the screw, circling round of nut, when screw and nut cooperation were screwed up, the tooth top point of screw was pressed down to first slot position for screw and nut can easily be screwed up, and when screw and nut were screwed up preset position or were screwed up the back, when meetting the reason such as artificial dismantlement or vibrations and circling round, because the back tooth top point of screw is blocked by the wall of second slot, make the tooth top point embedding nut of rack of circling round in and unable dismantlement or the not hard up nut that circles round, thereby guarantee that the connection between the part can not become flexible.

Preferably, the distance between the tooth top and the thread outer diameter is 0.2-1 times of the thread pitch, so that the resistance is not large when the screw is screwed, and the tooth top can be reliably embedded into the blocking groove of the nut when the screw is loosened to prevent the screw from loosening.

Preferably, the first groove and the second groove are parallel, the center line of the first groove and the center line of the cross section of the screw are provided with an off-angle, and the off-angle is 10 degrees to 30 degrees, so that the anti-convolution rack can be easily inclined according to a required direction, and the tooth tip can protrude out of the outer circle of the screw.

Preferably, the width of the first groove is 1 to 3 times of the thread pitch, and the thickness of the anti-convolution rack is equal to or greater than the thread pitch, so that when the anti-convolution rack is tilted, the rear tooth tip is blocked by the wall of the second groove, and the tooth tip can protrude out of the outer diameter of the screw rod, and can be embedded into the blocking groove of the nut.

Preferably, the bottom of each of the first groove and the second groove is provided with an arc bottom, the depth of the first groove is 2 to 4 times of the thread pitch from the top end of the thread downwards, and the depth of the second groove is more than 2 times of the depth of the first groove, so that the anti-convolution rack is easy to topple over to the second groove.

Preferably, at least one thread at the foremost end of the anti-convolution rack is a platform after the thread teeth are removed, and the highest point of the platform is lower than the outer diameter of the thread of the threaded rod, so that the thread cannot generate obstacles when entering.

Preferably, the thread tail part of the anti-convolution rack is provided with a stop groove, the depth of the stop groove is greater than the thread bottom diameter, the width of the stop groove enables a machined cutter not to damage a screw head, and when the rear part of the threaded rod is a bolt polished rod or a direct thread reaches the screw head part, the screw head is convenient to machine and not damaged during machining.

Preferably, the width and depth of the blocking groove are both 1.5 times or more of the thread pitch, so that the tooth tops can be reliably embedded.

Due to the adoption of the technical scheme, the anti-convolution screw and nut combination provided by the invention has the beneficial effects that: can be directly manufactured on the existing screw and nut finished products; 2. preventing the screw or nut from rotating; 3, the screw can be used as a common screw and a common nut.

Drawings

FIG. 1 is a schematic view of the nut of the present invention as it is threaded into a screw;

FIG. 2 is a schematic view of the construction of the screw of the present invention;

FIG. 3 is a schematic view of the FIG. 1 attachment structure of the present invention;

FIG. 4 is a schematic structural view of the nut of the present invention;

fig. 5 is a schematic diagram of the right-side view of fig. 4 according to the present invention.

In the figure: a screw head 1; a threaded rod 2; a cut-off groove 3; a first trench 4; a second trench 5; an anti-backspin rack 6; a tooth crest 7; a circular arc bottom 8; rear toe 9; a platform 10; a nut 11; a barrier groove 12.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and detailed description, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments.

Example 1

In the embodiment 1 shown in the attached

drawings

1, 2, 3 and 5, the screw head 1 and the threaded rod 2 are included, at least one group of elastic anti-convolution structures are arranged at the longitudinal position of the threaded rod 2, each elastic anti-convolution structure is composed of a first groove 4, a second groove 5 and an anti-convolution rack 6, a tooth top 7 protruding from the outer diameter of the thread is formed at the intersection of a thread tooth top of the anti-convolution rack 6 and the first groove 4, the top pointed end of the tooth top 7 points to the direction opposite to the screwing-in direction of the thread, a rear tooth top 9 is formed at the intersection of the outer diameters of the anti-convolution rack 6 and the second groove 5, the rear tooth top 9 is in contact with the second groove 5, the distance of the tooth top 7 protruding from the outer diameter of the thread is 0.6 times of the thread pitch, the first groove 4 and the second groove 5 are parallel structures, the central line of the first groove and the central line of the section of the screw are provided, the degree of the deviation angle 13 is 20 degrees, the width of the first groove 4 is 2 times of the thread pitch, the thickness of the anti-rotation rack 6 is equal to the thread pitch, the bottom parts of the first groove 4 and the second groove 5 are provided with arc bottoms 8, the depth of the first groove 4 is 3 times of the thread pitch from the top end of the thread downwards, the depth of the second groove 5 is more than 2 times of the depth of the first groove 4, at least one thread at the foremost end of the anti-rotation rack 6 is a platform 10 after being removed of the thread, the highest point of the platform 10 is lower than the outer diameter of the thread of the threaded rod 2, the thread tail part of the anti-rotation rack 6 is provided with a stop groove 3, and the width and the depth of the blocking groove 12 are both 1.5 times or more of the thread pitch.

When the invention is used, the threaded rod 2 is threaded through a part hole to be fixed, and then the nut 11 is screwed into a required position or directly screwed, which is very convenient.

Claims

1. The utility model provides an anti-convolution screw and nut combination, includes screwhead (1), threaded rod (2) and nut (11), characterized by: the utility model discloses a nut, including threaded rod (2), nut (11), the longitudinal position of threaded rod (2) is equipped with at least a set of elasticity and prevents the structure of circling round, elasticity is prevented the structure of circling round and is become by first slot (4), second slot (5) and have elastic rack (6) of circling round, the crossing department of the screw thread addendum of rack (6) of circling round and first slot (4) forms the addendum point (7) of salient in the screw thread external diameter, the top point sense of addendum point (7) is opposite with the direction of screw thread screw in, the crossing position of rack (6) of circling round and second slot (5) external diameter forms back addendum point (9), back addendum point (9) and second slot (5) contact, be equipped with 1 at least baffling groove (.

2. The anti-backspin screw and nut combination of claim 1, wherein: the distance of the tooth crest (7) from the outer diameter of the thread is 0.2 to 1 time of the thread pitch.

3. The anti-backspin screw and nut combination of claim 1, wherein: the first groove (4) and the second groove (5) are of parallel structures, a deviation angle (8) is arranged between the center line of the first groove and the center line of the cross section of the screw, and the degree of the deviation angle (8) is 10-30 degrees.

4. The anti-rotation screw and nut combination according to claim 1 or 3, wherein: the width of the first groove (4) is 1 to 3 times of the thread pitch, and the thickness of the anti-backspin rack (6) is equal to or larger than the thread pitch.

5. The anti-backspin screw and nut combination of claim 1, wherein: the tank bottom of first slot (4) and second slot (5) is equipped with circular arc end (8), the degree of depth of first slot (4) is 2 times to 4 times of pitch from the screw thread top downwards, the degree of depth of second slot (5) is more than 2 times of first slot (4) degree of depth.

6. The anti-backspin screw and nut combination of claim 1, wherein: at least one thread at the foremost end of the anti-convolution rack (6) is removed to form a platform (10), and the highest point of the platform (10) is lower than the external diameter of the thread of the threaded rod (2).

7. The anti-backspin screw and nut combination of claim 1, wherein: the tail part of the thread of the anti-convolution rack (6) is provided with a stop groove (3), and the depth of the stop groove is greater than the bottom diameter of the thread.

8. The anti-backspin screw and nut combination of claim 1, wherein: the width and the depth of the barrier groove (12) are both 1.5 times or more of the screw pitch.