CN113931918A

CN113931918A - Taper needle type anti-loose nut

Info

Publication number: CN113931918A
Application number: CN202010671705.1A
Authority: CN
Inventors: 何天麟
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2022-01-14
Anticipated expiration: 2040-07-13
Also published as: CN113931918B

Abstract

The taper pin type anti-loose nut is divided into an extrusion type nut and a stamping type nut, and is a two-stage anti-loose nut with functions of impact extrusion installation anti-loose and reverse rotation disassembly (vibration) anti-loose, the highest anti-loose torque is 439 and 722N.m through detection of M20 extrusion (stamping) taper pin type anti-loose nuts by Jiangsu province product quality supervision and inspection research institute, the data of the anti-loose torque N.m is almost close to that of spot welding and adhesive connecting nuts and screw rods, the problems that in the prior art, holes are respectively formed in the screw rods and the nuts in advance, keys are checked and pins and the like can only prevent the nuts from falling off and the defects of nut anti-loose are overcome during installation are solved, and the taper pin type anti-loose nut can be used for various mechanical equipment, roads, bridges, power grid iron towers, aerospace equipment and other equipment without matched fasteners for disassembly parts.

Description

Taper needle type anti-loose nut

Belongs to the technical field of:

the invention relates to a mechanical fastener, in particular to a two-stage taper needle type anti-loose nut with an undetachable bidirectional retaining function.

Background art:

the invention relates to a taper needle type anti-theft nut which is improved on the basis of a patent number ZL201410457881.X of a taper needle type anti-theft nut granted on 5, month and 4 in 2016.

The invention content is as follows:

the invention improves the anti-loose sensitivity on the basis of the anti-loose mechanism of the taper needle type anti-theft nut, changes the red heading manufacture into the high-speed cold heading machine manufacture, reduces the manufacturing cost and improves the productivity.

The technical problem to be solved;

the technical problems that the depth of a groove is changed due to the fact that an anti-rust hot-dip galvanized layer is adopted in the taper pin type anti-theft nut, the meshing strength of original steel materials is covered, anti-loosening sensitivity is affected and the like are solved, and the technical problems that the shape of the groove needs to be changed and process steps need to be increased reasonably due to the fact that a high-speed cold heading machine manufacturing process is changed from a red heading manufacturing process.

The technical scheme is as follows:

the taper needle type anti-loosening nut is divided into an extrusion type nut and a stamping type nut, and the nut body is characterized as follows;

(one) common features; the wall of the internal thread of the common nut is provided with one to two grooves which are formed by combining two inclined planes in different directions, the radial direction is along the screwing-in direction of the internal thread, the arc-shaped slope surface from shallow to deep is formed, the deep end can accommodate the one-way force application groove of the conical needle, the axial direction is from the radial arc-shaped groove to backward, the inner thread is communicated up and down by the slope surface extending deep and shallow, the slope degree is the same as the taper degree of the conical needle, the process step which can accommodate the concave platform or large chamfer space of the residual material is reserved at the connecting part of the large end of the axial inclined plane of the groove and the end surface of the nut body in the cold heading manufacturing process, a blank (steel) expands towards the end surface of the nut to extend out the concave platform or large chamfer space, in order to accord with the process steps of the cold heading machine production of the high-speed nut, the wall of the groove is firstly processed into an axial trapezoidal step type arc-shaped wall surface, the fifth and the sixth die procedure are extruded into the arc-shaped slope wall surface and the number of the trapezoidal steps are counted, the thickness of the nut is determined, and trapezoidal step connection groove type marks are allowed to appear on the wall surface of the groove taper arc slope processed through cold heading.

(II) distinguishing characteristics; the extrusion nut groove formed by four parts of the extrusion nut body, the conical needle, the sheath and the retainer ring is arranged on the forced end face of the nut body along the radial direction of the large arc-shaped slope face, and the small arc-shaped slope face is arranged on the non-forced end face. The groove is arranged on the non-acting end face of the nut body along the radial direction of the large arc-shaped slope face, and the small arc-shaped slope face is arranged on the acting end face. The taper needle is characterized in that; is a hard taper pin, and the retainer ring is characterized in that; is a common gasket. The protective sleeve is a plastic protective sleeve which does not affect the screwing of the wrench, can contain the nut body to fix the taper needle, guides the taper needle to enter the groove and immediately breaks after being subjected to extrusion force.

An assembly feature;

in order to ensure the fit clearance of the internal thread and the external thread and not influence the screwing-in and screwing-out of the nut, the conical needle outcrop is adhered in the groove in advance by using butter for combined assembly, and invention patents applied in 2019, 10, month and 24 are added; a taper needle type anti-theft nut sheath, application number; 201911020244.5, the effect of improving the installation speed is better.

Mounting features of extruded nuts;

the screw rod outcrop part with installation fastening bolt and nut is put into the shelves circle, has the thrust end face of awl needle with extrusion formula nut, to shelves circle screw in screw rod after, at the in-process of screwing up with the spanner, outcrop awl needle relies on connecting piece and fastening nut terminal surface to block the reverse extrusion awl needle of shelves circle, by the broken coming off of plastics sheath guide awl needle along oblique wall face entering slot on the way extrusion, gets rid of the zinc layer and reaches the static cooperation, reaches the locking effect of unloading that improves sensitivity.

A stamped nut mounting feature;

the force application end face of the stamping nut is screwed in the screw rod outcrop part for installing the fastening bolt and the nut, the stamping nut is screwed by a wrench to wait for acceptance and acceptance, then the conical needle is impacted by a hand hammer through the sleeve, the plastic sheath is broken and falls off by impact force, the conical needle enters the groove along the inclined wall surface and is pressed into the outer thread cusp to achieve interference fit, the anti-loosening and unloading effect cannot be easily loosened even in a strong vibration environment, and the installed conical needle large head cannot be blocked by the rear screw rod full-tooth external thread without extrusion damage.

A release prevention mechanism;

the zinc material features that the zinc material is soft and has no hardness, the surface of the hot dip galvanized matching thread replaces the original steel material meshing strength, the taper needle is adopted to extrude the oblique wall surface of the groove and the zinc layer of the external thread tooth tip, and the residual zinc layer is pressed into the groove step to connect the gravure groove and the external tooth groove, so that the space of the rolling stopping action of the taper needle in the groove is not influenced, the thread matching clearance is thoroughly eliminated, and the anti-loosening sensitivity is improved.

And (II) in the installation process, the punching (extruding) taper pin eliminates the zinc layer (pressing into the outer thread cusp), the original steel hardness meshing is achieved, the taper pin load in the groove is uniformly distributed, 80% of total load is avoided when the common nut is meshed on the whole length line of the extruded outer thread, the weak point concentrated on the thread contact surface of the front two teeth is avoided, and the punching type nut also has a special fixing function on any position of the screw for the anti-loosening function of installation.

And (III) in the disassembly process, the conical needle is pushed to rapidly expand and roll in a fan shape along the screw rod by the aid of the radial arc-shaped slope bottom wall surface of the groove under the pushing of the reverse rotation (vibration) force, the working height of the thread from the tooth point of the external thread to the depth of the tooth root is extruded, the reverse rotation force is larger, the conical needle is pressed into the screw rod deeper, and the generated disassembly-preventing torque N.m is higher. Therefore, the M16 taper-needle nut is a detection result that when the anti-disassembly torque is detected to be N.m in the product quality supervision and inspection research institute in Jiangsu province, the bolt of the sample is broken, and the nut cannot be easily unscrewed.

The anti-loosening structure is not influenced by the tolerance control of the external thread of the screw, and even if the anti-loosening structure is arranged on a toothless polished rod with the tolerance of 0.20nn negative to the internal thread hole, the anti-loosening structure also has the special anti-loosening function of fixing the polished rod in a reverse rotation mode and preventing the polished rod from falling off.

The change of the conical needle;

when the conical taper needle is pushed by a reverse rotation (vibration) force, the nut body is shifted to the radial arc-shaped slope bottom wall surface of the groove, the conical taper needle is pushed to expand along the screw rod and roll in a fan shape to extrude to form a secondary loosening and unloading prevention structure, if the conical taper needle is changed into a triangular (polygonal or knurled) taper needle, the conical taper needle is punched (extruded) into the groove, the one-time positioning and fixing structure which can not be detached can be formed, the unloading prevention torque N.m is naturally smaller than the secondary loosening and unloading prevention structure.

A totally-enclosed extrusion type nut;

the screw thread on the non-acting end face of the extrusion type nut body is reserved for saving the design of a plastic sheath, the acting end face is provided with a concave platform which can contain the thickness of a check ring and is larger than the exposed height of a taper needle, the check ring is adhered to the opening of the concave platform by using glue, and the taper needle is collected in the totally-closed extrusion type nut in the groove under the condition that the taper needle does not influence the screwing of the nut body into a screw, so that the taper needle can be conveniently extruded and directly enter the groove after the check ring is reversely extruded by a fastening nut and degummed.

The invention has the beneficial effects that:

the invention has the advantages that the basic detection anti-loosening torque N.m data of the taper needle type anti-theft nut is kept, the interference of a zinc layer is eliminated, the anti-loosening sensitivity is improved, the original seven nut red upsetting running water process is changed into the high-speed nut cold heading machine manufacturing, the manufacturing cost is reduced, the production speed is improved, and compared with the Japanese Hard Lock never-loose nut, the anti-loosening high-grade nut with the anti-loosening function is added.

Description of the drawings:

FIG. 1; a squeeze-type nut body; front view

FIG. 2; a squeeze-type nut body; left view

FIG. 3; punching the nut body; right side view

FIG. 4; punching the nut body; front view

FIG. 5; a conical needle; front view

FIG. 6; a retainer ring; front view

FIG. 7; a plastic sheath; front view

FIG. 8; a plastic sheath; left view

FIG. 9; assembling the extrusion nut; front view

FIG. 10; assembling the extrusion nut; A-A direction half-section view

FIG. 11; assembling a stamped nut; front view

FIG. 12; assembling a stamped nut; B-B direction half-sectional view

FIG. 13; installing an extrusion type nut retainer ring; schematic diagram of

FIG. 14; screwing in the extrusion type nut; schematic diagram of

FIG. 15; the extrusion type nut is installed by screwing the wrench; schematic diagram of

FIG. 16; screwing in the stamped nut; schematic diagram of

FIG. 17; screwing the extrusion nut by a spanner; schematic diagram of

FIG. 18; the sleeve is impacted by the hand hammer, and the conical needle for crushing the sheath is inserted into the groove; schematic diagram of

FIG. 19; front view of totally enclosed type extrusion nut

FIG. 20; schematic drawing of screwing-in totally-enclosed type extrusion nut

FIG. 21; schematic diagram of fully-enclosed extrusion nut screwed by wrench

In FIGS. 1 to 21

1; extrusion type nut body

2; stamping type nut body

3; taper needle

4; check ring

5; taper needle type anti-theft nut sheath

6; bolt

7; nut

8; connecting piece

9; connected piece

10; spanner

11; sleeve barrel

12; hand hammer

13; totally enclosed extrusion nut

The specific implementation mode is as follows:

the invention is described in detail below with reference to the accompanying drawings:

example 1:

the awl pin locknut assembly feature shown in fig. 1, 2, 5, 6, 7, 8, 9, 10; the extrusion nut is assembled by four parts, namely the extrusion nut body 1, the conical needle 3, the retainer ring 4 and the sheath 5, as shown in figure 9 and figure 10.

Example 2:

a compression nut mounting feature as shown in fig. 13-14-15; put into the shelves circle 4 to the screw rod 6 outcrop part with installation fastening bolt 6 and nut 7, have the thrust end face of awl needle 3 with extrusion formula nut picture 11 figure 12, behind the screw rod 6 of shelves circle 4 screw in, at the in-process of screwing up with spanner 10, outcrop awl needle 3 relies on by connecting piece 9 and fastening nut 7 terminal surface to block 4 backward extrusion awl needles of shelves circle, it is broken and drops to get into the slot on the way along the inclined wall face extrusion by plastic sheath 5 guide awl needle 3, it reaches the static fit to get rid of the zinc layer, reach the locking effect of unloading that improves sensitivity.

Example 3:

the awl pin locknut assembly feature shown in fig. 3, 4, 5, 7, 8, 11, 12; the punch nut is assembled by three parts, namely a punch nut body 2, a conical needle 3 and a sheath 5, and is shown in figure 11 and figure 12.

Example 4:

a stamped nut mounting feature as shown in fig. 16, 17, 18; the force application end face of the ram nut in the figure 11 and the figure 12 is screwed in the outcrop part of the screw 6 for installing the fastening bolt 6 and the nut 7, the ram nut in the figure 11 and the figure 12 is screwed by a wrench 10 and waits for acceptance and acceptance, then the conical needle 3 is impacted by a hammer 12 through a sleeve 11, the conical needle is impacted, broken and falls off at a plastic sheath 5, the conical needle 3 enters a groove along an inclined wall face and is pressed into an outer thread tip 6 to achieve interference fit, the anti-loosening effect is not easy to loosen even in a strong vibration environment, and the big end of the installed conical needle 3 is blocked by the full thread of the screw 6 without extrusion damage at the back and cannot fall off.

Example 5:

the awl pin locknut assembly feature shown in fig. 19, 20, 21; the screw thread on the non-acting end face of the extrusion type nut body 1 is reserved for saving the design of the plastic sheath 5, the thickness of the retaining ring 4 which is larger than the height of the protruding head of the conical needle 3 is arranged on the acting end face, the retaining ring 4 is adhered to the opening of the concave platform by glue, the conical needle 3 is collected in the totally-closed extrusion type nut in the groove under the condition that the conical needle 3 does not influence the screwing of the nut body 1 into the screw 6, and the conical needle 3 is convenient to extrude after the retaining ring 4 is reversely extruded by the fastening nut 7 to degum in the installation process and directly enters the groove.

Example 6:

the taper pin locknut mechanism shown in FIG. 18 and FIG. 21; in the installation process, the taper needle 3 is adopted to extrude the oblique wall surface of the groove and the zinc layer of the external thread cusp, the thread fit clearance is thoroughly eliminated, the hardness meshing of the original steel materials is achieved, the anti-loosening weak point that only 80% of total load is concentrated on the thread contact surface of the front two teeth when the common nut 7 is meshed is filled, and the secondary anti-loosening function is generated under the pushing of the reverse rotation (vibration) force. The anti-loosening structure is not influenced by the control of the tolerance of the external thread of the screw 6, and even if the anti-loosening structure is arranged on a toothless polished rod which is minus the tolerance of the internal thread hole by 0.20nn, the anti-loosening structure also has the special anti-loosening function of reversely rotating and fixing without falling off.

The above examples do not limit the invention in any way, and all technical solutions obtained by means of equivalent substitution or equivalent transformation fall within the scope of protection of the invention.

Claims

1. The conical needle type anti-loose nut is provided with one to two arc-shaped slope surfaces which are arranged on the wall of the internal thread hole of the nut body and have the radial direction along the screwing direction of the internal thread from shallow to deep, the deep end can accommodate a conical needle groove, the axial direction is backward from the radial arc-shaped groove, the large end of the groove arc notch is arranged on the force application end face of the nut body, the stamping nut is composed of a stamping nut body, a conical needle and a protective sleeve, the large end of the groove arc notch is arranged on the force application end face of the nut body, the large end of the groove arc notch is arranged on the non-force application end face of the nut body, the conical needle is a conical pin, the protective sleeve is a gasket, and the protective sleeve can contain the nut body to fixedly guide the conical needle to enter the groove and is extruded and crushed by the stamping.

2. The awl pin locknut feature of claim 1; the non-detachable two-stage anti-loose nut has anti-loose and anti-reverse (anti-vibration) anti-loose functions of impact extrusion installation.