CN208900509U - A kind of internal-expansion type check bolt - Google Patents

Abstract

The utility model discloses a kind of internal-expansion type check bolt structures, including the body of bolt, a through-hole is arranged in the intermediate of the body of bolt, the top of the through-hole is cylindrical bore, the end of through-hole is bellmouth, and bellmouth is surrounded by equally distributed elastic groove, is equipped with clamping screw in the through-hole, the clamping screw is connect with expansion block in taper, and the internal screw thread in the taper among expansion block matches with clamping screw.Clamping screw is that hexagon socket head cap screw is connect with expansion block in the taper.The advantages that the utility model has structure simple, and simple process, manufacturing cost is low, convenient to carry out.

Description

A kind of internal-expansion type check bolt

Technical field

The utility model relates to a kind of devices of dismountable threaded fastener connection, concretely relate to for screw thread A kind of bolt with anti-loosening property of fastener connection.

Background technique

For the loosening problem of threaded fastener connection, people take many active and effective locking measures, in the market Also there are many anti-loose fastener products, but these products are mostly stop nuts, and check bolt product it is few again It is few.Currently, for screw retention method there are mainly two types of: one is variable-tooth type check bolt, another kind is using adhesive Bonding.

One, the tooth form of variable-tooth type check bolt is different from the tooth form of common standard bolt, and tooth form is that have in the bottom of thread One tapered ramp axially to form an angle with screw thread.When variable-tooth type check bolt and internal screw thread screw, variable-tooth type is locking The tapered ramp at the external screw thread tooth bottom of bolt withstands the cusp of internal screw thread, makes to generate radial interference between screw thread pair, is produced by interference Raw frictional force prevents the pine relatively between screw thread pair to turn.Although variable-tooth type check bolt has certain anti-loosing effect, Due to tooth form structure, there is also following defects for it:

1. the tolerance accommodation of bolt is haveed the defects that certain

The cooperation of variable-tooth type check bolt and threaded hole is radial interference fit.When outside the lower deviation of variable-tooth type check bolt When screw thread and upper deviation internal screw thread screw, amount of interference may very little, the thread locking torque as caused by amount of interference is also just very Small, at this moment the anti-loosening property of bolt will have a greatly reduced quality；Conversely, the upper deviation external screw thread when bolt is screwed with lower deviation internal screw thread When, amount of interference may be very big, and the locking torque as caused by amount of interference may be far beyond the first time of prescribed by standard It is screwed into maximum moment, bolt is made to be difficult to be screwed into the threaded hole of internal screw thread, the serious normal use that also will affect bolt.

2. the reusability of bolt is haveed the defects that certain

For variable-tooth type check bolt, locking torque is to lean on the cusp of internal screw thread to withstand bolt tooth bottom to generate. If bolt is repeatedly screwed into, back-outs threaded hole, certain galling necessarily will cause.This galling results in bolt again Locking torque value it is unstable, some even can be lower than back-outing minimum torque value as defined in standard.Locking torque value it is unstable Or reduce, and the reusability of bolt is restricted.Therefore, this bolt is generally only applicable to unessential field Close and do not need the position frequently dismantled.

3. the torsion-of bolt is established unprincipled connection to have the defects that certain

Since there is defects for the tolerance accommodations of variable-tooth type check bolt internal threads, so, it is produced by interference engagement Raw frictional force can also generate certain uncertainty.Therefore, the locking torque value of this bolt often changes greatly, coupling mechanism force The dispersibility increase that is unstable and making tools for bolts ' pretension force value of square.Since these are uncertain and the presence of dispersion sexual factor, The relationship caused between the torsional moment of fastening system and pretightning force is unstable, so make fastening system be difficult to obtain stablize it is constant Pretightning force.

Two, using adhesives

Using adhesives, exactly after the external threaded surface of bolt coats a layer of adhesive, then bolt is screwed into spiral shell In pit, after to be bonded dose of solidification, the screw thread of matching is just firmly stuck together, to prevent relatively loose between screw thread pair Turn, to achieve the purpose that locking is locking.

Although the anti-loosing effect of adhesives is reliable, there is also certain defects for it: first is that, using bonding Original detachable threaded connection is become non-removable connection by the method for agent bonding.Second is that the use of adhesive is by temperature Degree limitation, excessively high temperature can be such that adhesive softens；Too low temperature can make adhesive become hard crisp；The alternating of high and low temperature Variation accelerates the aging for making adhesive again.

Utility model content

The purpose of this utility model is to provide a kind of internal-expansion type check bolts, to solve to propose in above-mentioned background technique The problem of.

To achieve the above object, the utility model provides the following technical solutions: a kind of internal-expansion type check bolt, including spiral shell A through-hole is arranged in body, the intermediate of the body of bolt, and the top of the through-hole is cylindrical bore, and the end of through-hole is taper Hole, bellmouth are surrounded by equally distributed elastic groove, are equipped with clamping screw, the clamping screw and taper in the through-hole Interior expansion block connects, and the internal screw thread in the taper among expansion block matches with clamping screw.

Further improvement lies in that: the clamping screw is that hexagon socket head cap screw is connect with expansion block in the taper.To locking Bolt apply twist after, in taper expansion block by body of bolt end have elastic groove bellmouth distending, at this point, the external screw thread of bolt end is straight Diameter also increases with it.External screw thread after increase is tightly attached on the inner wall of internal screw thread, makes to generate a stabilization not between screw thread pair The radial interference frictional force of change.This interference friction power can effectively prevent the pine relatively of screw thread pair from turning, and make threaded fastener The pretightning force of connection is enduringly maintained for a long time, to meet the requirement of threaded fastener connection anti-loose antidetonation.

Compared with prior art, the utility model has the beneficial effects that

1. the utility model structure is simple, simple process, manufacturing cost is low, convenient to carry out.

2. the utility model can effectively prevent between screw thread pair relatively pine turn, make threaded fastener be connected to through Its pretightning force also can be enduringly kept for a long time when the fluctuating loads such as vibrated, impact, to better meet threaded fastener The requirement of connection anti-loose antidetonation.

3. the utility model has good adaptability to thread tolerance, with high limit screw-internal thread fit still with it is low Limit screw-internal thread fit can obtain reliable and stable locking torque.

4. the utility model does not need the torsional moment for additionally increasing bolt in use, so the torsional moment of bolt Torsion-with pretightning force establishes unprincipled connection to be stable linear relationship.

5. the locking locking functions of the utility model are realized by interior swollen mode, bolt and threaded hole will not Generate galling and plastic deformation.Therefore, internal-expansion type check bolt has preferable reusability.

Detailed description of the invention

Fig. 1 is the utility model main view；

Fig. 2 is the utility model side view；

In figure, 1 body of bolt, 2 clamping screws, expansion block in 3 tapers.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

The utility model provides a kind of internal-expansion type check bolt embodiment referring to FIG. 1-2:

A through-hole is arranged in intermediate in the body of bolt 1, and the through-hole of bolt end is the bellmouth with elastic groove, bolt top The through-hole at end is cylindrical bore, one clamping screw 2 of setting in the through-hole of the body of bolt 1, in the bellmouth with elastic groove Expansion block 3 in one taper is set, and expansion block 3 is connect with clamping screw 2 in taper.

The technical requirements such as basic profile, diameter and the screw pitch of the body of bolt 1, basic size, tolerance fit and mechanical performance It is identical as plain bolt, to ensure that internal-expansion type check bolt can match with the internal screw thread of standard.

A through-hole is arranged in the intermediate of the body of bolt 1, and the top of through-hole is cylindrical bore；The end of through-hole is bellmouth, Bellmouth is surrounded by equally distributed elastic groove, and effect is exactly when elastic groove distending, and the external screw thread of bolt will be right Internal screw thread generates interference, effectively prevents the pine relatively of screw thread pair to turn by the frictional force that interference generates.Clamping screw 2 is interior six Corner bolt, hexagon socket head cap screw are connect with expansion block 3 in taper, play adjusting and locking to expansion block 3 in taper.Expansion block 3 in taper Intermediate internal screw thread matches with clamping screw 2, and effect is exactly the bellmouth distending that 1 end of the body of bolt is had to elastic groove When, make the by-produced interference friction power of screw thread.Expansion block 3 in the body of bolt 1, clamping screw 2 and taper is combined, is just constituted Internal-expansion type check bolt.

It is stubborn by then being applied according to the screw-down torque of regulation to bolt in the threaded hole of internal-expansion type check bolt screw-in workpiece, After pretightning force as defined in reaching when it, then clamping screw 2 is tightened.Expansion block 3 is tightened in rear taper by 1 end band of the body of bolt Flexible slot bellmouth distending, at this point, the external thread diameter of bolt end also increases with it, the external screw thread after increase is tightly attached to On the inner wall of internal screw thread, generation one between screw thread pair is made to stablize constant radial interference frictional force, this interference friction power energy Enough pines relatively for effectively preventing screw thread pair turn, and the pretightning force for connecting threaded fastener is enduringly maintained for a long time, thus Meet the requirement of threaded fastener connection anti-loose antidetonation.

The locking locking functions of internal-expansion type check bolt are realized by mode swollen in screw thread.It has to screw thread Tolerance has adaptable；It turns round-establishes unprincipled connection and is good；Galling and the reliable and stable feature of locking torque will not be generated.Cause This, it can effectively prevent the pine relatively of screw thread pair from turning, and the pretightning force for connecting threaded fastener is enduringly protected for a long time It holds, to meet the requirement of threaded fastener connection anti-loose antidetonation.

While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims (2)

1. a kind of internal-expansion type check bolt, including the body of bolt (1), it is characterised in that: the intermediate setting one of the body of bolt (1) Through-hole, the top of the through-hole are cylindrical bore, and the end of through-hole is bellmouth, and being surrounded by for bellmouth is equally distributed Elastic groove, the through-hole is interior to be equipped with clamping screw (2), and the clamping screw (2) connect with expansion block in taper (3), the taper The intermediate internal screw thread of interior expansion block (3) matches with clamping screw (2).

2. a kind of internal-expansion type check bolt according to claim 1, it is characterised in that: the clamping screw (2) is interior Hex bolts is connect with expansion block (3) in the taper.