Anti-vibration and anti-loose bolt

Abstract

The utility model provides an anti -shock anti -loose bolt, including bolt main part, the inside of bolt main part is provided with the axle hole along its axial direction arrangement, be provided with connecting shaft in the axle hole, the both ends of connecting shaft are fixedly installed with eccentric baffle and torsion piece respectively, eccentric baffle is located bolt main part's screw rod end portion and diameter is less than screw rod diameter, the utility model discloses an eccentric baffle structure driven by arc spring is set up in the bolt, constitutes an active, normal mechanical limiting device, in initial state, eccentric baffle is deflected under the spring effect, and the physical obstacle is set up for the backoff path of nut in advance, this pure mechanical type locking mode fundamentally prevents the reverse rotation and axial retreat of nut, and the anti -loose reliability is much higher than the traditional method of relying on friction, especially suitable for high -strength, long -time vibration working condition.

Description

Technical Field

[0001] This utility model belongs to the field of bolt technology, and more specifically, it relates to an anti-vibration and anti-loosening bolt. Background Technology

[0002] Bolted connections are the most widely used detachable connection method in the fields of mechanical manufacturing and engineering installation. Their reliability is directly related to the operational safety of equipment and the stability of engineering structures. In key areas such as construction, bridges, rail transit, and engineering machinery, bolted connections are often subjected to complex working environments such as vibration, impact, and temperature cycling, and traditional bolted connection structures are prone to loosening.

[0003] Existing anti-loosening bolt technologies mainly include friction anti-loosening (such as spring washers and double nuts) and permanent anti-loosening (such as welding and bonding). Among them, friction anti-loosening relies on the friction between the bolt and the connected parts to achieve anti-loosening. Under long-term vibration loads, the friction is prone to gradual attenuation, leading to the failure of the anti-loosening effect. Permanent anti-loosening, on the other hand, loses the detachability of the bolt connection, which is not conducive to the later maintenance and repair of equipment.

[0004] Therefore, developing a mechanical anti-loosening bolt that is simple in structure, has reliable anti-loosening performance, is easy to repeatedly assemble and disassemble, and can adapt to harsh vibration environments has important practical significance and technical value. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an anti-vibration and anti-loosening bolt, which is achieved by the following specific technical means: An anti-seismic and anti-loosening bolt includes a bolt body with a shaft hole arranged along its axis inside. A connecting shaft is disposed in the shaft hole, and an eccentric baffle and a torsion block are fixedly installed at both ends of the connecting shaft. The eccentric baffle is located at the end of the bolt body's thread and has a diameter smaller than the thread diameter. The torsion block is located inside the head of the bolt body and extends to the outside of the head. An arc-shaped groove is formed on the inner wall of the shaft hole, and a connecting block located in the arc-shaped groove is fixedly installed on the connecting shaft. The connecting block is fixedly connected to the inner wall of the arc-shaped groove by an arc-shaped spring. A nut is threaded onto the thread of the bolt body. In the initial state, the elastic force of the arc-shaped spring causes the eccentric baffle to deflect, and the deflected eccentric baffle limits the movement path of the nut.

[0006] Furthermore, at least two protrusions for facilitating twisting operations are fixedly installed at equal intervals on the outer circumferential wall of the twisting block.

[0007] Furthermore, the number of the arc springs is matched with the number of connecting blocks, and the natural state of the arc springs matches the curvature of the arc groove.

[0008] Furthermore, at least one washer is fitted onto the threaded portion of the bolt body, and the washer is sandwiched between the nut and the eccentric baffle.

[0009] Furthermore, the gasket is an elastic gasket.

[0010] Furthermore, the connecting block and the connecting shaft are integrally formed.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting an eccentric baffle structure driven by an arc spring inside the bolt, an active and normalized mechanical limiting device is formed. In the initial state, the eccentric baffle deflects under the action of the spring, setting a physical obstacle for the nut's retraction path in advance. This purely mechanical locking method fundamentally prevents the nut from rotating in the opposite direction and retracting axially. Its anti-loosening reliability is far higher than that of traditional methods that rely on friction, and it is especially suitable for high-intensity, long-term vibration conditions.

[0012] Second, the torsion block set on the bolt head allows for easy adjustment of the eccentric baffle's position when it is inserted into the connected parts, avoiding the trouble of installation failure due to improper baffle positioning. The entire installation process is no different from that of ordinary bolts; simply tightening the nut normally will automatically activate the anti-loosening function, improving assembly efficiency and convenience. The number of elastic washers can be increased or decreased to adapt to different clamping thickness requirements, allowing the eccentric baffle to press against the nut through the washers, preventing loosening. At the same time, this anti-loosening mechanism does not rely on the plastic deformation of the threads or chemical adhesives, so after disassembly, each component can usually return to its original position without affecting its function, exhibiting good reusability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the entire anti-seismic and anti-loosening bolt of this utility model.

[0014] Figure 2 This is a schematic diagram of the bolt body of this utility model cut open.

[0015] Figure 3 This is a schematic diagram of the connecting shaft of this utility model.

[0016] Figure 4 This is a schematic diagram of the shaft hole of this utility model.

[0017] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Bolt body; 11. Nut; 2. Shaft hole; 3. Arc groove; 4. Connecting shaft; 5. Eccentric baffle; 6. Torsion block; 61. Raised bar; 7. Connecting block; 8. Arc spring. Detailed Implementation

[0018] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0019] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0021] As attached Figure 1 To be continued Figure 4 As shown: This utility model provides an anti-vibration and anti-loosening bolt, including a bolt body 1. The bolt body 1 has a shaft hole 2 arranged along its axis. A connecting shaft 4 is arranged in the shaft hole 2. An eccentric baffle 5 and a torsion block 6 are fixedly installed at both ends of the connecting shaft 4, respectively. The eccentric baffle 5 is located at the end of the bolt body 1 and its diameter is smaller than the diameter of the bolt. The torsion block 6 is located inside the head of the bolt body 1 and extends to the outside of the head. An arc groove 3 is formed in the inner wall of the shaft hole 2. A connecting block 7 located in the arc groove 3 is fixedly installed on the connecting shaft 4. The connecting block 7 is fixedly connected to the inner wall of the arc groove 3 by an arc spring 8. A nut 11 is threaded on the bolt body 1. In the initial state, the elastic force of the arc spring 8 causes the eccentric baffle 5 to deflect. After deflection, the eccentric baffle 5 limits the movement path of the nut 11.

[0022] At least two protrusions 61 are fixedly installed at equal intervals on the outer circumferential wall of the torsion block 6 to facilitate the torsion operation, so as to facilitate the rotation of the connecting shaft 4 and the eccentric baffle 5, and thus facilitate the assembly of bolts.

[0023] The number of arc springs 8 is matched with the number of connecting blocks 7, and the natural state of the arc springs 8 matches the curvature of the arc groove 3.

[0024] At least one washer is fitted at the threaded part of the bolt body 1. The washer is an elastic washer and is sandwiched between the nut 11 and the eccentric baffle 5. The number of washers can be selected according to the actual assembly requirements so that both sides of the washer are in contact with the surfaces of the nut 11 and the eccentric baffle 5 respectively.

[0025] The connecting block 7 and the connecting shaft 4 are integrally formed.

[0026] The working principle of this embodiment: Step 1: With the bolts not assembled, the connecting block 7 on the connecting shaft 4 is embedded in the arc-shaped groove 3 on the inner wall of the shaft hole 2. The arc-shaped spring 8 is in a pre-compressed state, and its elastic restoring force pushes the connecting block 7 to deflect along the arc-shaped groove 3, thereby driving the connecting shaft 4 and the eccentric baffle 5 to rotate synchronously. Since the diameter of the eccentric baffle 5 is smaller than the diameter of the bolt screw and it is in an eccentric arrangement, the deflected eccentric baffle 5 will form an asymmetrical blocking structure at the end of the screw, laying the foundation for the subsequent limiting of the nut 11. During connection and assembly, first pass the bolt body 1 through the mounting hole of the connected parts, then put the washer (if used) on the screw, and then tighten the nut 11 along the screw thread to the preset torque to complete the fastening of the connected parts; at this time, the washer is sandwiched between the nut 11 and the eccentric baffle 5. The eccentric baffle 5, which has been deflected in the initial state, forms a blockage with the end face of the nut 11 through the washer, which restricts the backward path of the nut 11 along the screw axis from the mechanical structure, and initially blocks the possibility of the nut 11 loosening; Step 2: When the bolted connection is under complex working conditions such as vibration and impact, the nut 11 is easily affected by external forces and tends to loosen, and tends to back out along the bolt thread; at this time, the mechanical limit of the eccentric baffle 5 plays a role. Its deflected structure directly blocks the backward displacement of the nut 11, forming an anti-loosening barrier; the elastic restoring force of the arc spring 8 will continuously push the connecting block 7 to reset, so that the eccentric baffle 5 and the washer always maintain the limiting pressure on the nut 11, realizing dynamic anti-loosening during vibration and ensuring connection stability; Step 3: During bolt connection assembly, since the torsion block 6 is located inside the head of the bolt body 1 and extends to the outside of the head, it is convenient to twist the connecting shaft 4 and the eccentric baffle 5 to rotate, making it easy for the bolt body 1 to pass through the mounting hole of the connector, which makes the operation more convenient.

[0027] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A seismic-resistant and anti-loosening bolt, comprising a bolt body (1), characterized in that: The bolt body (1) has an internal shaft hole (2) arranged along its axial direction. A connecting shaft (4) is provided in the shaft hole (2). An eccentric baffle (5) and a torsion block (6) are fixedly installed at both ends of the connecting shaft (4). The eccentric baffle (5) is located at the end of the bolt body (1) and its diameter is smaller than that of the bolt. The torsion block (6) is located inside the head of the bolt body (1) and extends to the outside of the head. An arc groove (3) is provided on the inner wall of the shaft hole (2). A connecting block (7) located in the arc groove (3) is fixedly installed on the connecting shaft (4). The connecting block (7) is fixedly connected to the inner wall of the arc groove (3) through an arc spring (8). A nut (11) is threaded on the bolt of the bolt body (1). In the initial state, the elastic force of the arc spring (8) causes the eccentric baffle (5) to deflect. After deflection, the eccentric baffle (5) limits the movement path of the nut (11).

2. The anti-seismic and anti-loosening bolt as described in claim 1, characterized in that: At least two protrusions (61) for convenient twisting operation are fixedly installed at equal intervals on the outer circumferential wall of the twisting block (6).

3. The anti-seismic and anti-loosening bolt as described in claim 1, characterized in that: The number of the arc springs (8) is matched with the number of the connecting blocks (7), and the natural state of the arc springs (8) matches the curvature of the arc groove (3).

4. The anti-seismic and anti-loosening bolt as described in claim 1, characterized in that: At least one washer is fitted on the screw of the bolt body (1), and the washer is sandwiched between the nut (11) and the eccentric baffle (5).

5. The anti-seismic and anti-loosening bolt as described in claim 4, characterized in that: The gasket is an elastic gasket.

6. The anti-seismic and anti-loosening bolt as described in claim 1, characterized in that: The connecting block (7) and the connecting shaft (4) are integrally formed.

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