Self-locking type fastening bolt

Abstract

The utility model relates to the technical field of fastening bolts, in particular to a self-locking type fastening bolt which comprises a screwing head, a round block fixedly installed on the surface of the bottom of the screwing head and a screw fixedly installed on the surface of the side, away from the screwing head, of the round block. The screw self-locking mechanism comprises a mounting cavity formed in the circular block, an arc-shaped elastic piece fixedly mounted on the upper surface of an inner cavity of the mounting cavity, a connecting ring fixedly mounted on the surface of the arc-shaped elastic piece, and a connecting cylinder fixedly mounted on the surface of the connecting ring and penetrating to the outer surface of the circular block. When the self-locking type fastening bolt is used, the connecting cylinder and the circular ring are extruded downwards through the arc-shaped elastic piece, so that after the bolt is installed, the inclined face teeth can make close contact with the installation face, the bolt can be prevented from loosening on the installation face through the inclined face teeth, and when the bolt needs to be disassembled, the connecting cylinder is shrunk towards the interior of the installation cavity through the shifting block and the connecting rod; therefore, the bevel teeth can be separated from the mounting surface, and then the bolt can be disassembled.

Description

Technical Field

[0001] The present application relates to the technical field of fastening bolts, and in particular to a self-locking fastening bolt. Background Art

[0002] A fastening bolt is a threaded connector used to connect and fix two or more parts. It is usually made of metal. One end with a thread can be screwed into another part, and the other end is usually equipped with a nut or other fixings to fix and connect the parts. Fastening bolts are widely used in mechanical equipment, building structures, automobiles, aerospace and other fields, and are a common connecting element.

[0003] Chinese patent CN208686782U discloses a self-locking bolt, comprising a bolt body and a washer, wherein the bolt body comprises a bolt head and a screw rod connected to each other, the washer is sleeved on the screw rod, and a plurality of first bevel teeth are arranged at one end of the bolt head in contact with the washer, and a second bevel tooth matching the first bevel teeth is arranged at one end of the washer in contact with the bolt head; a loosening thrust surface is arranged on the first bevel tooth, and an angle between the loosening thrust surface and a horizontal plane is greater than a thread lead angle of the screw rod; and a friction coefficient between an end of the washer away from the bolt head and a workpiece surface is greater than a friction coefficient between contact surfaces of the first bevel teeth and the second bevel teeth.

[0004] The above patent improves the disadvantage that the self-locking bolts in the prior art must be used with self-locking nuts to achieve self-locking of the bolts, and cannot adapt to the situation where the threaded hole is inside the body (usually called a blind hole) or has special usage requirements, resulting in poor applicability of the self-locking bolts. The present embodiment provides another implementation scheme for the problems raised in the above patent. Utility Model Content

[0005] In response to the shortcomings of the prior art, the present application provides a self-locking fastening bolt, which has the advantages of easy use and strong applicability. It solves the problem that the self-locking bolts in the prior art must be used in conjunction with self-locking nuts to achieve self-locking of the bolts, and cannot adapt to situations where the threaded hole is inside the body (usually called a blind hole) or has special usage requirements, resulting in poor applicability of the self-locking bolts.

[0006] In summary, the present application provides the following technical solutions: a self-locking fastening bolt, comprising a screw head, a round block fixedly mounted on the bottom surface of the screw head, a screw fixedly mounted on the surface of the round block away from the screw head, and a screw self-locking mechanism is provided on the round block;

[0007] The screw self-locking mechanism includes an installation cavity opened inside the round block, an arc-shaped spring piece fixedly installed on the upper surface of the inner cavity of the installation cavity, a connecting ring fixedly installed on the surface of the arc-shaped spring piece, a connecting tube fixedly installed on the surface of the connecting ring and penetrating to the outer surface of the round block, a circular ring fixedly installed on the bottom of the connecting tube, bevel teeth fixedly installed on the lower surface of the circular ring, a connecting rod fixedly installed on the side surface of the connecting tube and penetrating to the outer surface of the round block, and a shifting block fixedly installed on the end of the connecting rod away from the connecting tube.

[0008] Furthermore, the cross-sectional shape of the installation cavity is annular, vertical limit grooves are provided between opposite side surfaces inside the installation cavity, and limit blocks inserted into the vertical limit grooves are fixedly installed on the opposite side surface of the connecting ring.

[0009] The beneficial effect of adopting the above further solution is that the connecting ring can be limited by the vertical limiting groove and the limiting block, so that the connecting ring and the connecting cylinder can be prevented from rotating in the installation cavity.

[0010] Furthermore, the vertical limiting groove and the limiting block are matched with each other, and the outer surface of the limiting block is in sliding contact with the inner surface of the vertical limiting groove.

[0011] The beneficial effect of adopting the above further solution is that it is convenient for the limit block to move up and down in the vertical limit groove.

[0012] Furthermore, a strip-shaped hole communicating with the interior of the installation cavity is opened on the side surface of the round block, and the connecting rod is located in the strip-shaped hole.

[0013] The beneficial effect of adopting the above further solution is that it is easy for the connecting rod to move on the round block.

[0014] Furthermore, there are multiple arc-shaped spring pieces, and the multiple arc-shaped spring pieces are evenly distributed on the upper surface of the inner cavity of the installation cavity.

[0015] The beneficial effect of adopting the above further solution is that by providing a plurality of arc-shaped spring pieces, the arc-shaped spring pieces have sufficient elastic supporting force for the connecting tube.

[0016] Furthermore, there are multiple bevel teeth, and the multiple bevel teeth are evenly distributed on the lower surface of the ring.

[0017] The beneficial effect of adopting the above further solution is that it is helpful to increase the friction between the ring and the mounting surface.

[0018] Furthermore, a rubber protective sleeve is fixedly mounted on the side surface of the round block, and the circular ring is located inside the rubber protective sleeve.

[0019] The beneficial effect of adopting the above further solution is that the connection between the bolt and the mounting surface can be protected by the rubber protective sleeve, which is helpful to prevent debris from entering the gap between the bolt and the mounting surface.

[0020] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0021] The self-locking fastening bolt, when in use, uses the arc-shaped spring piece to squeeze the connecting tube and the circular ring downward, so that the bevel teeth can be in close contact with the mounting surface after the bolt is installed. The bevel teeth can prevent the bolt from loosening on the mounting surface. When the bolt needs to be removed, the connecting tube is retracted into the mounting cavity by the shift block and the connecting rod, so that the bevel teeth can be separated from the mounting surface, and the bolt can be removed. This solves the problem that the self-locking bolt in the prior art must be equipped with a self-locking nut to achieve the self-locking of the bolt, and cannot adapt to the situation where the threaded hole is inside the body or has special use requirements, resulting in poor applicability of the self-locking bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of the utility model;

[0023] Figure 2 It is a schematic cross-sectional view of a circular block of the utility model;

[0024] Figure 3 It is a schematic diagram of a circular ring of the utility model;

[0025] Figure 4 This is a schematic diagram of the arc-shaped spring piece of the utility model;

[0026] Figure 5 It is a cross-sectional schematic diagram of the installation cavity of the utility model.

[0027] Description of reference numerals:

[0028] 1. Screw head; 2. Round block; 3. Screw; 4. Installation cavity; 5. Arc spring piece; 6. Connecting ring; 7. Connecting tube; 8. Round ring; 9. Bevel teeth; 10. Vertical limit groove; 11. Limit block; 12. Connecting rod; 13. Push block; 14. Strip hole; 15. Rubber protective cover. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] See also Figure 1-5A self-locking fastening bolt in this embodiment includes a screw head 1, a round block 2 fixedly mounted on the bottom surface of the screw head 1, a screw 3 fixedly mounted on the surface of the round block 2 away from the screw head 1, and a screw self-locking mechanism is provided on the round block 2. The screw self-locking mechanism includes a mounting cavity 4 opened inside the round block 2, an arc-shaped spring piece 5 fixedly mounted on the upper surface of the inner cavity of the mounting cavity 4, a connecting ring 6 fixedly mounted on the surface of the arc-shaped spring piece 5, and a connecting tube 7 fixedly mounted on the surface of the connecting ring 6 and penetrating to the outer surface of the round block 2. The number of the arc-shaped spring pieces 5 is multiple, and the multiple arc-shaped spring pieces 5 are evenly distributed on the upper surface of the inner cavity of the mounting cavity 4. By arranging multiple arc-shaped spring pieces 5, The arc-shaped spring piece 5 has sufficient elastic supporting force for the connecting tube 7. The cross-sectional shape of the installation cavity 4 is annular. Vertical limit grooves 10 are provided between the surfaces of the opposite sides inside the installation cavity 4. The surface of the connecting ring 6 on the opposite side is fixedly installed with a limit block 11 inserted into the vertical limit groove 10. The connecting ring 6 can be limited by the vertical limit groove 10 and the limit block 11, which can prevent the connecting ring 6 and the connecting tube 7 from rotating in the installation cavity 4. The vertical limit groove 10 and the limit block 11 are adapted to each other. The outer surface of the limit block 11 is in sliding contact with the inner surface of the vertical limit groove 10, which facilitates the limit block 11 to move up and down in the vertical limit groove 10.

[0031] The screw self-locking mechanism also includes a ring 8 fixedly mounted on the bottom of the connecting tube 7, and a beveled tooth 9 fixedly mounted on the lower surface of the ring 8. The number of beveled teeth 9 is multiple, and the multiple beveled teeth 9 are evenly distributed on the lower surface of the ring 8, which is conducive to improving the friction between the ring 8 and the mounting surface. The screw self-locking mechanism also includes a connecting rod 12 fixedly mounted on the side surface of the connecting tube 7 and penetrating to the outer surface of the round block 2, and a shifting block 13 fixedly mounted on the end of the connecting rod 12 away from the connecting tube 7. The side surface of the round block 2 is provided with a strip hole 14 connected to the inside of the mounting cavity 4. The connecting rod 12 is located in the strip hole 14, which is convenient for the connecting rod 12 to move on the round block 2. A rubber protective sleeve 15 is fixedly mounted on the side surface of the round block 2, and the ring 8 is located inside the rubber protective sleeve 15. The rubber protective sleeve 15 can protect the connection between the bolt and the mounting surface, which is conducive to preventing debris from entering the gap between the bolt and the mounting surface.

[0032] It should be noted that the inclination direction of the bevel teeth 9 in this embodiment is opposite to the tightening direction of the screw rod 3 .

[0033] The working principle of the above embodiment is:

[0034] When in use, use the screw head 1 to screw the screw rod 3 into the threaded hole. During the screwing process, the round block 2, the connecting tube 7 and the ring 8 rotate synchronously with the screw rod 3. When the screw rod 3 is completely screwed into the threaded hole, the bevel teeth 9 contact the mounting surface, and the connecting tube 7 shrinks into the mounting cavity 4 and squeezes the arc spring piece 5. At the same time, the arc spring piece 5 will produce a reaction force to squeeze the connecting tube 7 and the ring 8, so that the bevel teeth 9 can be in close contact with the mounting surface, which can prevent the bolt from loosening and realize the self-locking of the bolt. When the bolt needs to be removed, the shift block 13 is shifted upward to drive the connecting rod 12 and the connecting tube 7 to move, so that the ring 8 and the bevel teeth 9 are separated from the mounting surface, and the bolt can be turned in the direction to be removed. When the bolt is installed, the bottom of the rubber protective cover 15 will be in close contact with the mounting surface to protect the connection between the bolt and the mounting surface.

Claims

1. A self-locking fastening bolt, comprising a screw head (1), a round block (2) fixedly mounted on the bottom surface of the screw head (1), and a screw rod (3) fixedly mounted on the surface of the round block (2) on a side away from the screw head (1), characterized in that: The round block (2) is provided with a screw self-locking mechanism; The screw self-locking mechanism comprises a mounting cavity (4) opened inside the round block (2), an arc-shaped spring piece (5) fixedly mounted on the upper surface of the inner cavity of the mounting cavity (4), a connecting ring (6) fixedly mounted on the surface of the arc-shaped spring piece (5), a connecting tube (7) fixedly mounted on the surface of the connecting ring (6) and penetrating to the outer surface of the round block (2), a circular ring (8) fixedly mounted on the bottom of the connecting tube (7), a beveled tooth (9) fixedly mounted on the lower surface of the circular ring (8), a connecting rod (12) fixedly mounted on the side surface of the connecting tube (7) and penetrating to the outer surface of the round block (2), and a shifting block (13) fixedly mounted on the end of the connecting rod (12) away from the connecting tube (7).

2. A self-locking fastening bolt according to claim 1, characterized in that: The cross-sectional shape of the installation cavity (4) is annular, vertical limit grooves (10) are provided between opposite side surfaces inside the installation cavity (4), and limit blocks (11) are fixedly installed on the opposite side surface of the connecting ring (6) and inserted into the vertical limit grooves (10).

3. A self-locking fastening bolt according to claim 2, characterized in that: The vertical limiting groove (10) and the limiting block (11) are matched with each other, and the outer surface of the limiting block (11) is in sliding contact with the inner surface of the vertical limiting groove (10).

4. A self-locking fastening bolt according to claim 1, characterized in that: A strip-shaped hole (14) communicating with the interior of the installation cavity (4) is provided on the side surface of the round block (2), and the connecting rod (12) is located in the strip-shaped hole (14).

5. A self-locking fastening bolt according to claim 1, characterized in that: The number of the arc-shaped spring pieces (5) is multiple, and the multiple arc-shaped spring pieces (5) are evenly distributed on the upper surface of the inner cavity of the installation cavity (4).

6. A self-locking fastening bolt according to claim 1, characterized in that: The number of the bevel teeth (9) is multiple, and the multiple bevel teeth (9) are evenly distributed on the lower surface of the ring (8).

7. A self-locking fastening bolt according to claim 1, characterized in that: A rubber protective sleeve (15) is fixedly mounted on the side surface of the round block (2), and the circular ring (8) is located inside the rubber protective sleeve (15).

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