Bolt anti-loosening structure

Abstract

The utility model relates to the technical field of fastening devices, in particular to a bolt anti-loosening structure. Comprising a bolt head and a bolt rod, the bolt rod is in threaded connection with a hexagon head nut, a limiting base is coaxially arranged at the end of the bolt rod, and at least two first limiting faces are arranged on the side edge of the limiting base; the hexagonal head nut is sleeved with a limiting block, the limiting block is provided with a first limiting cavity and a second limiting cavity which are communicated, the side wall of the first limiting cavity is attached to the six side faces of the hexagonal head nut, and the side wall of the second limiting cavity is attached to the first limiting face on the limiting base. According to the utility model, the hexagonal head nut is limited by the first limiting cavity, and the limiting seat is limited by the second limiting cavity, so that the hexagonal head nut and the bolt bar cannot rotate relatively all the time, and the stability between the hexagonal head nut and the bolt bar is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of fastening devices, and particularly relates to a bolt loosening prevention structure. Background Art

[0002] Bolt connection is the most common mechanical connection method for mechanical structures. However, for bolt connection structures that bear dynamic loads or impact loads, the bolt connection structure will loosen under the influence of dynamic loads or impact loads during service.

[0003] To solve this technical problem, in the prior art, the following several methods are usually used to lock the nut and bolt fastening devices. For example: shortening the thread pitch of the nut, self-locking with double bolts, tightening with a spring washer, welding the bolt to death, destroying the thread of the bolt for screwing out, etc. The actual use situation shows that shortening the thread pitch of the nut, self-locking with double bolts, tightening with a spring washer, etc. do have a certain locking effect. However, when encountering working conditions with high vibration frequency and long construction period, the nut and bolt will surely loosen. For solutions such as welding the bolt to death and destroying the thread of the bolt for screwing out, when it is necessary to disassemble the mechanical device, the bolt needs to be cut off first and then the nut is loosened, which will greatly affect the work efficiency and cause unnecessary waste. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a bolt loosening prevention structure for realizing the locking of bolts and nuts without changing the shapes of bolts and nuts.

[0005] The technical solution adopted by the utility model to solve its technical problem is a bolt loosening prevention structure, which includes a bolt head and a bolt rod fixed to the bolt head. A hexagon head nut is threadedly connected to the bolt rod. A limiting seat is coaxially arranged at the end of the bolt rod. At least two first limiting surfaces are arranged on the side of the limiting seat; the projection of the limiting seat on the horizontal plane is located within the horizontal projection of the bolt rod; a limiting block is sleeved on the hexagon head nut. A first limiting cavity and a second limiting cavity which communicate with each other are arranged on the limiting block. The side wall of the first limiting cavity is attached to the six side surfaces of the hexagon head nut, and the side wall of the second limiting cavity is attached to the first limiting surfaces on the limiting seat.

[0006] Further, there are six first limiting surfaces on the limiting seat, and the six first limiting surfaces are parallel to the six side surfaces of the hexagon head nut in sequence.

[0007] Further, a plurality of grooves extending to the side wall of the limiting block are arranged on the lower surface of the limiting block, and the plurality of grooves are arranged along the circumferential direction of the limiting block.

[0008] Further, a jacking mechanism is arranged in the groove.

[0009] Further, the ejection mechanism includes an ejection bolt, the axis of the ejection bolt is parallel to the axis of the bolt rod, and a threaded hole for cooperating with the ejection bolt is provided on the inner wall of the groove.

[0010] Further, a protective pad is provided at the end of the ejection bolt away from the threaded hole.

[0011] Further, rubber pads are provided on the top surface of the bolt head and the bottom surface of the hexagon head nut.

[0012] The beneficial effects of the present utility model are as follows: By providing a first limiting cavity and a second limiting cavity on the limiting block, the side wall of the first limiting cavity fits with the six side surfaces of the hexagon head nut, and the side wall of the second limiting cavity fits with the first limiting surface on the limiting seat. With such a setting, the first limiting cavity limits the hexagon head nut, and the second limiting cavity limits the limiting seat, so that relative rotation between the hexagon head nut and the bolt rod will never occur, ensuring the stability between the hexagon head nut and the bolt rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is a cross-sectional view taken along line A-A in Figure 1 ;

[0015] Figure 3 is a schematic diagram of the hexagon head nut and the bolt rod;

[0016] Figure 4 is a schematic diagram of the limiting block.

[0017] Reference numerals: 1 - bolt head; 2 - bolt rod; 3 - hexagon head nut; 4 - limiting seat; 401 - first limiting surface; 5 - limiting block; 501 - first limiting cavity; 502 - second limiting cavity; 6 - groove; 7 - ejection bolt; 8 - rubber pad; 9 - first connecting block; 10 - second connecting block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0019] As Figures 1-4As shown in the figure, a bolt loosening prevention structure of the present utility model includes a bolt head 1 and a bolt rod 2 fixed to the bolt head 1. A hexagonal nut 3 is threadedly connected to the bolt rod 2. A limit seat 4 is coaxially arranged at the end of the bolt rod 2. At least two first limit surfaces 401 are arranged on the side of the limit seat 4. The projection of the limit seat 4 on the horizontal plane is located within the horizontal projection of the bolt rod 2. A limit block 5 is sleeved on the hexagonal nut 3. A first limit cavity 501 and a second limit cavity 502 are arranged on the limit block 5 in a communicating manner. The side wall of the first limit cavity 501 is attached to the six side surfaces of the hexagonal nut 3. The side wall of the second limit cavity 502 is attached to the first limit surface 401 on the limit seat 4. Among them, the cross-section of the limit seat 4 can be a quadrilateral or a hexagon, and the first limit surface 401 is the side surface of the limit seat 4. The projection of the limit seat 4 on the horizontal plane is located within the horizontal projection of the bolt rod 2. Such a setting can ensure that the hexagonal nut 3 can be threadedly connected to the bolt rod 2 through the limit seat 4. The limit block 5 is sleeved on the hexagonal nut 3. The cross-section of the first limit cavity 501 is a hexagon that matches the hexagonal nut 3, and the side wall of the first limit cavity 501 is attached to the six side surfaces of the hexagonal nut 3. The second limit cavity 502 matches the limit seat 4, and the side wall of the second limit cavity 502 is attached to the first limit surface 401 on the limit seat 4. It should be noted here that while the side wall of the first limit cavity 501 is attached to the six side surfaces of the hexagonal nut 3, the side wall of the second limit cavity 502 is attached to the first limit surface 401 on the limit seat 4. The first limit cavity 501 limits the hexagonal nut 3, and the second limit cavity 502 limits the limit seat 4, so that relative rotation between the hexagonal nut 3 and the bolt rod 2 will never occur.

[0020] Specific operation process of the present utility model: When it is necessary to use this structure to connect the first connection block 9 and the second connection block 10, the bolt rod 2 passes through the through holes on the first connection block 9 and the second connection block 10. The hexagonal nut 3 passes through the limit seat 4 and is screwed onto the bolt rod 2 until the hexagonal nut 3 contacts the upper surface of the first connection block 9, and the upper surface of the bolt head 1 is attached to the lower surface of the first connection block 9, realizing the connection between the first connection block 9 and the second connection block 10. At this time, the limit block 5 is sleeved on the hexagonal nut 3, and the limit block 5 is driven to move downward by a rubber hammer until the side wall of the first limit cavity 501 is attached to the six side surfaces of the hexagonal nut 3, and the side wall of the second limit cavity 502 is attached to the first limit surface 401 on the limit seat 4, so that relative rotation between the hexagonal nut 3 and the bolt rod 2 will never occur, ensuring the stability between the hexagonal nut 3 and the bolt rod 2.

[0021] For the convenience of manufacturing and installation, further, there are six first limit surfaces 401 on the limit seat 4, and the six first limit surfaces 401 are parallel to the six side surfaces of the hexagonal nut 3 in sequence.

[0022] For the convenience of removing the limit block 5 from the hexagon head nut 3, further, refer to Figure 4 . A plurality of grooves 6 extending to the side wall of the limit block 5 are provided on the lower surface of the limit block 5, and the plurality of grooves 6 are arranged along the circumferential direction of the limit block 5. During disassembly, one end of a pry bar is inserted into the groove 6, and the other end of the pry bar is pressed down forcefully to cause relative movement between the limit block 5 and the hexagon head nut 3. After the pry bar is pried in one groove 6, the pry bar can be transferred to another groove 6 until the limit block 5 is separated from the hexagon head nut 3.

[0023] Further, an ejection mechanism is provided in the groove 6. Refer to Figure 4 . The ejection mechanism includes an ejection bolt 7, the axis of the ejection bolt 7 is parallel to the axis of the bolt rod 2, and a threaded hole for cooperating with the ejection bolt 7 is provided on the inner wall of the groove 6. The head of the ejection bolt 7 is clamped by a wrench to drive the ejection bolt 7 to rotate, so that the ejection bolt 7 can be screwed out of the threaded hole until the head of the ejection bolt 7 contacts the top surface of the first connecting block 9. Continuing to rotate the ejection bolt 7 can realize the relative movement between the limit block 5 and the hexagon head nut 3. Similarly, the ejection bolts 7 in each groove 6 can be rotated in sequence to make the movement of the limit block 5 smoother.

[0024] In order to prevent the end of the ejection bolt 7 from scratching the top surface of the first connecting block 9 when contacting the first connecting block 9, further, a protective pad is provided at the end of the ejection bolt 7 away from the threaded hole. The protective pad can be made of rubber material and is connected to the ejection bolt 7 by an adhesive method.

[0025] In order to further improve the loosening ability, refer to Figure 3 . Rubber pads 8 are provided on the top surface of the bolt head 1 and the bottom surface of the hexagon head nut 3. The rubber pads 8 are bonded to the top surface of the bolt head 1 and the bottom surface of the hexagon head nut 3. During use, the rubber pads 8 can increase the friction coefficient between the hexagon head nut 3 and the first connecting block 9 and the friction coefficient between the bolt head 1 and the second connecting block 10. At the same time, the rubber pads 8 have elasticity and can increase the stroke of the hexagon head nut 3 when the hexagon head nut 3 is screwed onto the bolt rod 2, that is, the hexagon head nut 3 can rotate a certain angle more, ensuring that the six sides of the hexagon head nut 3 are in contact with the side wall of the first limit while the side wall of the second limit cavity 502 is also in contact with the first limit surface 401 on the limit seat 4.

[0026] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore: All equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A bolt loosening prevention structure, comprising a bolt head (1) and a bolt rod (2) fixed to the bolt head (1), wherein a hexagon head nut (3) is threadedly connected to the bolt rod (2), and is characterized in that: A limiting seat (4) is coaxially arranged at the end of the bolt rod (2), and at least two first limiting surfaces (401) are arranged on the side of the limiting seat (4); the projection of the limiting seat (4) on the horizontal plane is located within the horizontal projection of the bolt rod (2); a limiting block (5) is sleeved on the hexagonal head nut (3), and a communicated first limiting cavity (501) and a second limiting cavity (502) are arranged on the limiting block (5), the side wall of the first limiting cavity (501) is attached to the six side surfaces of the hexagonal head nut (3), and the side wall of the second limiting cavity (502) is attached to the first limiting surface (401) on the limiting seat (4).

2. The bolt loosening prevention structure according to claim 1, characterized in that: There are six first limiting surfaces (401) on the limiting seat (4), and the six first limiting surfaces (401) are parallel to the six side surfaces of the hexagonal head nut (3) in sequence.

3. A bolt loosening prevention structure according to claim 1, characterized in that: A plurality of grooves (6) extending to the side wall of the limiting block (5) are arranged on the lower surface of the limiting block (5), and the plurality of grooves (6) are arranged along the circumferential direction of the limiting block (5).

4. The anti-loosening structure of a bolt according to claim 3, wherein: A jacking mechanism is arranged in the groove (6).

5. The bolt loosening prevention structure according to claim 4, characterized in that: The jacking mechanism includes a jacking bolt (7), the axis of the jacking bolt (7) is parallel to the axis of the bolt rod (2), and a threaded hole for cooperating with the jacking bolt (7) is arranged on the inner wall of the groove (6).

6. A bolt loosening prevention structure according to claim 5, characterized in that: A protective pad is arranged at the end of the jacking bolt (7) far from the threaded hole.

7. A bolt loosening prevention structure according to claim 1, characterized in that: Rubber pads (8) are arranged on the top surface of the bolt head (1) and the bottom surface of the hexagonal head nut (3).

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