CN204572727U - The locking EXPANSION ANCHOR BOLTS of a kind of tube-expanding type - Google Patents

Abstract

The utility model discloses an expansion tube type anti-loosening expansion bolt, which is characterized in that: the outer peripheral surface of the main body bolt has an external thread structure matched with the internal thread hole of the workpiece, and has an axially penetrating internal thread hole. The front section of the bolt is set as an expansion section that can expand radially, and the expansion section has a hollow expansion hole that runs through the axial direction; the stop bolt forms a threaded fit with the internal thread hole of the main body bolt with its external thread, and the stop bolt is in the main body bolt. The direction of rotation in the middle is opposite to the direction of rotation of the main body bolt in the internal threaded hole of the workpiece; the front end of the stop bolt can go deep into the hollow expansion hole of the expansion section, so that the expansion section expands in the radial direction and touches the workpiece The surface of the internally threaded hole. The utility model can effectively prevent loosening, is easy to assemble and disassemble, and avoids wear and tear.

Description

An expansion tube anti-loosening expansion bolt

technical field

The utility model relates to a fastener, in particular to a threaded connector for fastening.

Background technique

Ordinary bolt connections have certain self-locking properties, but in the process of vibration and in environments with large temperature changes, it is easy to cause bolts to loosen or even fall off, causing unnecessary losses. Whether it is made of metal or plastic parts, there is inevitably wear and tear during disassembly and assembly. Due to wear and tear, the fit gap between components is increased, and frequent disassembly and assembly may easily lead to scrapping of the connected parts due to excessive wear.

The anti-loosening of threads in the prior art is generally provided with elastic washers, and the bottom end surface of the bolt is also set in a tooth shape to increase the friction between the end surface of the bolt and the assembly, but these methods cannot fundamentally solve the problem due to the thread The problem of loosening of threaded joints caused by the increase of fit clearance.

The application number is 201120276074.X, and the authorized announcement number is: CN202301389U. The utility model patent discloses "a new type of screw" which is coated with nylon rope on its thread, and a layer of elastic body connection is established between the internal thread and the external thread. , so that it is completely embedded in the gap between the crest and the bottom of the thread, which can play a certain role in preventing loosening. However, nylon material is not suitable for long-term and repeated use, and cannot bear large working tension.

Utility model content

In order to avoid the disadvantages of the prior art, the utility model provides an expansion tube anti-loosening expansion bolt, which can effectively prevent loosening, be easy to assemble and disassemble, and avoid wear and tear.

The utility model adopts following technical scheme for solving technical problems:

The structural features of the utility model expansion tube anti-loosening expansion bolt include:

A main body bolt, the outer peripheral surface of which has an external thread structure that is threadedly matched with the internal thread hole of the workpiece. An expansion section, the expansion section has a hollow expansion hole axially penetrated; the structure of the expansion section of the main body bolt is set as follows: the front section of the main body bolt is arranged to be evenly distributed on the circumference and have at least three axial grooves The expansion tube of the mouth, the hollow expansion hole is a tapered hole in the expansion tube, and the bolt front end of the stop bolt goes deep into the tapered hole at different axial positions to make the expansion tube Radial bulges are formed.

A stop bolt, the external thread of the stop bolt forms a thread fit with the internal thread hole of the main body bolt, and the rotation direction of the stop bolt in the main body bolt is the same as that of the main body bolt in the internal thread hole of the workpiece The direction of rotation is the opposite direction; the bolt front end of the stop bolt can go deep into the hollow expansion hole of the expansion section, so that the expansion section expands in the radial direction and abuts against the surface of the internal threaded hole of the workpiece.

The structural feature of the utility model expansion tube anti-loosening expansion bolt is also that: the axial notches (4a) are four distributed in the shape of "ten".

Compared with the prior art, the beneficial effects of the utility model are reflected in:

1. The utility model uses the main body bolt and the stop bolt to form a nested internal and external thread structure, and the spiral direction is opposite, so the effect of stopping and preventing loosening is very significant;

2. The utility model is equipped with an expansion section, which further increases the anti-loosening effect in the form of radial expansion;

3. The utility model adopts the structural form of the expansion tube in the expansion section, which is simple and effective, easy to implement, and reliable in fastening;

Description of drawings

Fig. 1 a is the structural representation of the utility model;

Figure 1b is a schematic diagram of the appearance of the main body bolt in the utility model;

Fig. 1c is a schematic diagram of the internal structure of the main body bolt in the utility model;

Figure 1d is a schematic diagram of the stop bolt in the utility model;

Labels in the figure: 1 main body bolt, 2 internal threaded hole, 3 stop bolt, 4 expansion section, 4a axial notch, 4b expansion tube.

Detailed ways

Referring to Fig. 1a, Fig. 1b, Fig. 1c and Fig. 1d, this embodiment is an expansion tube anti-loosening expansion bolt, which includes:

The main body bolt 1, its outer peripheral surface has an external thread structure that is threadedly matched with the internal thread hole of the workpiece, the main body bolt 1 has an internal thread hole 2 that penetrates axially, and the front section of the main body bolt 1 is set as an expansion joint that can expand radially Segment 4, the expansion segment 4 has a hollow expansion hole 5 passing through in the axial direction.

The stop bolt 3, the stop bolt 3 forms a thread fit with the internal thread hole 2 of the main body bolt 1 with its external thread, the rotation direction of the stop bolt 3 in the main body bolt 1 is the same as the rotation direction of the main body bolt 1 in the workpiece internal thread hole The direction is the opposite direction; the bolt front end of the stop bolt 3 can go deep into the hollow expansion hole 5 of the expansion section 4, so that the expansion section 5 expands in the radial direction and abuts against the surface of the inner threaded hole of the workpiece.

In specific implementation, the structure of the expansion section 4 of the main body bolt 1 is set as follows: the front section of the main body bolt 1 is arranged as an expansion tube 4b that is evenly distributed on the circumference and has at least three axial notches 4a. The "ten" character is provided with four axial notches 4a; the hollow expansion hole 5 is a tapered hole in the expansion tube 4b, and the bolt front end of the stop bolt 3 penetrates into the tapered hole at different axial positions to make the expansion The tube 4b bulges in the radial direction.

When tightening, first place the main body bolt in the internal threaded hole of the workpiece with thread fit, and then fit the stop bolt in the internal thread hole of the main body bolt with thread, until the front end of the stop bolt goes deep into the expansion section. In the hollow expansion hole, the expansion tube in the expansion section expands radially and touches the surface of the inner threaded hole of the workpiece to achieve anti-loosening.

Claims (2)

1. the locking EXPANSION ANCHOR BOLTS of tube-expanding type, is characterized in that comprising:

One main body bolt (1), its outer peripheral surface has the external thread structure with workpiece interior threaded hole screw-thread fit, described main body bolt (1) has axially through interior threaded hole (2), being set at the leading portion of described main body bolt (1) can the expansion arc (4) of radially bulging, and described expansion arc (4) has the axially through swollen hole of hollow (5); The vibrational power flow of the expansion arc (4) of described main body bolt (1) is: described main body bolt (1) be set to circumferentially be uniformly distributed and having the expand tube (4b) of at least three axial notch (4a) at leading portion, described hollow is swollen hole (5) is in described expand tube (4b) cone shape hole, is embedded in described cone shape hole with the bolt front end of dogbolt (3) and axially different position makes described expand tube (4b) form bulging diametrically; Described dogbolt (3) forms screw-thread fit with the interior threaded hole (2) of its outside thread and described main body bolt (1), and the rotation direction of described dogbolt (3) in main body bolt (1) and the rotation direction of described main body bolt (1) in workpiece interior threaded hole are opposite direction; The bolt front end of described dogbolt (3) can be embedded in the swollen hole of hollow (5) of described expansion arc (4), makes described expansion arc (5) in radial bulging and is butted on the surface of workpiece interior threaded hole.

2. the locking EXPANSION ANCHOR BOLTS of tube-expanding type according to claim 1, is characterized in that: described axial notch (4a) is four of the distribution in " ten " word.