CN107013545B

CN107013545B - Self-plugging rivet

Info

Publication number: CN107013545B
Application number: CN201710466615.7A
Authority: CN
Inventors: 张晓斌; 甘美; 卢颖; 郗建豪; 贾晓娇; 齐跃; 张晓玲; 郭双双
Original assignee: Aerospace Precision Products Co Ltd
Current assignee: Aerospace Precision Products Co Ltd
Priority date: 2017-06-16
Filing date: 2017-06-16
Publication date: 2021-03-09
Anticipated expiration: 2037-06-16
Also published as: CN107013545A

Abstract

The invention provides a self-plugging rivet, which comprises a core bar, a nail sleeve, a lock ring, an anvil and a pipe body, wherein the core bar is fixedly connected with the nail sleeve; the head of the core rod is provided with a limiting table, the middle part of the core rod is provided with a neck breaking groove and a lock ring groove for accommodating the lock ring, and the tail part of the core rod is provided with a clamping section; the locking ring groove is positioned between the limiting table and the neck breaking groove; the nail sleeve and the tube body are sleeved on the core rod, the tail of the tube body can be limited by a limit table of the core rod, the tail of the nail sleeve can be limited by the head of the tube body, and the neck breaking groove is positioned inside the nail sleeve; the locking ring is sleeved on the locking ring groove of the core rod and is in clearance fit with the locking ring groove and the nail sleeve respectively, and the locking ring is made of a plastic deformable material; the anvil sheet is sleeved on the core rod and is positioned on one side of the nail sleeve facing the clamping section; the anvil has an overlapping surface with the staple cover and the lock ring in a direction perpendicular to the axial direction. The invention can solve the problems of easy defeat and easy falling of the installation of the lock ring.

Description

Self-plugging rivet

Technical Field

The invention relates to the field of fasteners, in particular to a lock ring built-in type blind rivet.

Background

The self-plugging rivet is a fastener capable of being installed on a single side, and is widely applied to connection of aerospace vehicles. The self-plugging rivet can be used for metal material connection, and also can be specially designed for composite material connection, can bear larger tensile and shearing resistance, and can be widely used in single-side installation, maintenance and other occasions. The general aerospace self-plugging rivet comprises a core rod, a nail sleeve, a locking ring and other accessory parts, wherein after the core rod and the nail sleeve are arranged and riveted in place, the locking ring outside is pushed into a locking groove to complete locking. However, when the blind rivets are installed, the lock ring has the risk of installation failure, and meanwhile, the lock ring is easy to fall off.

Disclosure of Invention

In view of the above, the invention aims to provide a lock ring built-in type blind rivet, which can solve the problems that the lock ring is easy to fail and fall off.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a self-plugging rivet comprises a core bar, a rivet sleeve, a lock ring, an anvil sheet and a tube body; the head of the core rod is provided with a limiting table, the middle part of the core rod is provided with a neck breaking groove and a lock ring groove for accommodating the lock ring, and the tail part of the core rod is provided with a clamping section; the locking ring groove is positioned between the limiting table and the neck breaking groove; the nail sleeve and the tube body are sleeved on the core rod, the tail of the tube body can be limited by a limit table of the core rod, and the tail of the nail sleeve can be limited by the head of the tube body; after the pipe body and the nail sleeve are limited by the limiting table in sequence, the neck breaking groove is positioned inside the nail sleeve; the locking ring is sleeved on the locking ring groove of the core rod and is in clearance fit with the locking ring groove and the nail sleeve respectively, and the locking ring is made of a plastic deformable material; the anvil sheet is sleeved on the core rod and is positioned on one side of the nail sleeve facing the clamping section; the anvil has an overlapping surface with the staple cover and the lock ring in a direction perpendicular to the axial direction.

Wherein, the body is one section flexible section.

The head of the pipe body is provided with a step ring groove, a ring is sleeved in the step ring groove, and the tail of the nail sleeve is in a conical shape with gradually reduced outer diameter, extends into the inner side of the ring at the head of the ring and is limited by the ring.

The outer surface of the ring is fixed with the inner surface of the step ring groove of the pipe body, and the ring is preferably made of polyformaldehyde materials.

At least one step-shaped concave-convex ring groove is arranged in the lock ring groove, and a step ring matched with the step-shaped concave-convex ring groove is arranged in the lock ring.

Wherein, the lock ring groove and the neck breaking groove are adjacently arranged.

The end face of the head of the nail sleeve is provided with a deformation groove with the diameter larger than the outer diameter of the lock ring, the depth of the deformation groove is smaller than the width of the lock ring, and preferably, the depth of the deformation groove is smaller than half of the width of the lock ring.

The outer diameter of the limiting table is the same as that of the tail of the pipe body.

The clamping section is composed of a plurality of annular grooves which are uniformly distributed at the tail part of the core rod along the shaft.

Wherein the head of the nail sleeve is in a trapezoid shape expanding outwards.

The lock ring is characterized in that a ring body of the lock ring is provided with an inclined groove, and the lock ring is made of metal titanium.

Compared with the prior art, the invention has the following advantages: the fittings are simple, and the parts are few. The locking ring is of a built-in type, and the additional design of the locking ring groove and the deformation groove enables the built-in locking ring to be locked when deformed, so that the reliability of the self-plugging rivet is improved, and the risk that the locking ring falls off is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural view of the core rod of FIG. 1;

FIG. 3 is a schematic view of the structure of the tube and the ring in FIG. 1;

FIG. 4 is a schematic view of the structure of the staple cover of FIG. 1;

FIG. 5 is a schematic view of the locking ring of FIG. 1;

FIG. 6 is a schematic view of the anvil of FIG. 1;

FIG. 7 is a schematic view of the rivet of FIG. 1 after installation.

Description of reference numerals:

1-core bar; 11-a limit table; 12-a lock ring groove; 13-neck breaking groove; 14-a clamping section; 2-nailing a sleeve; 21 deformation groove; 3-a locking ring; 31-a step ring; 4-anvil sheet; 5-a pipe body; 6-loop; 7-waiting for installation.

Detailed Description

The invention will be explained in detail below with reference to the drawings.

The structure of the invention is shown in figure 1, and comprises a core bar 1, a nail sleeve 2, a lock ring 3, an anvil 4 and a pipe body 5; the head of the core rod 1 is provided with a limiting table 11, the middle part of the core rod is provided with a neck breaking groove 13 and a locking ring groove 12 for accommodating the locking ring 3, and the tail part of the core rod is provided with a clamping section 14; the locking ring groove 12 is positioned between the limiting table 11 and the neck breaking groove 13; the nail sleeve 2 and the tube body 5 are sleeved on the core rod 1, the tail of the tube body 5 can be limited by a limiting table 11 of the core rod 1, and the tail of the nail sleeve 2 can be limited by the head of the tube body 5; after the pipe body 5 and the nail sleeve 2 are sequentially limited by the limiting table 11, the neck breaking groove 13 is positioned in the nail sleeve 2; the locking ring 3 is sleeved on the locking ring groove 12 of the core rod 1 and is in clearance fit with the locking ring groove 12 and the nail sleeve 2 respectively, and the locking ring 3 is made of a plastic deformable material; the anvil sheet 4 is sleeved on the core bar 1 and is positioned on one side of the nail sleeve 2 facing the clamping section 14; the anvil 4 has an overlapping surface with the sleeve 2 and the lock ring 3 in a direction perpendicular to the axial direction.

Wherein, body 5 is a section flexible section, can form the swell when the installation and warp.

The head of the pipe body 5 is provided with a step ring groove, the step ring groove is internally sleeved with a ring 6, and the tail of the nail sleeve 2 is conical with gradually reduced outer diameter, extends into the inner side of the ring at the head of the ring 6 and is limited by the ring 6. On one hand, the ring 6 can slow down the friction between the nail sleeve 2 and the tube body 5, and prevent the tube body from excessively deforming; on the other hand, the pin sleeve 2 plays a role in lubrication, and is convenient to smoothly enter the pipe body 2 during installation.

Wherein, the outer surface of the ring 6 is fixed with the inner surface of the step ring groove of the pipe body 5, and the material of the ring 6 is preferably polyformaldehyde material.

At least one step-shaped concave-convex ring groove is arranged in the lock ring groove 12, and a step ring 31 matched with the step-shaped concave-convex ring groove is arranged in the lock ring 3 and used for enabling the lock ring groove 12 to better limit the lock ring 3 and preventing the lock ring 3 from being separated from the lock ring groove 12.

Wherein, the locking ring groove 12 and the neck breaking groove 13 are adjacently arranged, so that the neck breaking groove 13 can be flush with the surface of the installed part after being broken.

The end face of the head of the nail sleeve 2 is provided with a deformation groove 21 with a diameter larger than the outer diameter of the lock ring 3, the depth (width) of the deformation groove 21 is smaller than the width (height) of the lock ring 3, and preferably, the depth (width) of the deformation groove 21 is smaller than half of the width (height) of the lock ring 3. The deformation groove 21 can be used for accommodating the deformed part of the locking ring 3 in the installation process, so that the locking ring 3 is deformed to fill or compact the gap between the core rod 1 and the nail sleeve 2 near the neck breaking groove 13, and the locking ring groove 12 is matched to improve the installation stability.

The outer diameter of the limiting table 11 is the same as that of the tail of the pipe body 5, so that transition and consistency of the outer surface are kept, and the limiting reliability of the limiting table 11 is guaranteed.

The clamping section 14 is preferably formed by a plurality of annular grooves uniformly distributed at the tail of the core rod 1 along the axis, and can be better clamped and fixed with a drawing tool.

Wherein, the head of the nail cover 2 is the trapezoidal of outside expansion, on the one hand can enlarge the contact surface with the hammering block piece 4, improves the transmission effect of power, and on the other hand can avoid because the head intensity that the existence of amortization groove 21 caused reduces, and on the other hand can be in treating the installation piece 7 and form the countersunk flat face on the surface in addition, avoid installing the back and protruding in treating the installation piece 7 surface.

Wherein, the ring body of the lock ring 3 is provided with a chute, and the lock ring 3 can be made of metal titanium.

A brief working process of the invention is as follows:

firstly, an installed rivet is inserted into a mounting hole of a to-be-installed part 7 from the head of a core rod 1, a clamping section 14 at the tail of the core rod 1 is clamped and fixed by a hand riveter, meanwhile, the other structure of the hand riveter head supports against an anvil 4, the head of a nail sleeve 2 is enabled to be stable in the mounting hole, the core rod 1 is pulled by the hand riveter, acting force is transmitted to the tail of a pipe body 5 through a limiting table 11, meanwhile, the tail of the nail sleeve 2 also applies the acting force to the head of the pipe body 5, the nail sleeve 2 gradually penetrates into the pipe body 5 along with the pulling of the core rod 1, meanwhile, the pipe body 5 gradually expands under the action of extrusion force to form a bulge, meanwhile, and meanwhile, the mutual acting force is generated between a lock ring 3 and the anvil 4 through an overlapped part, so that the lock ring 3. After the locking is finished, the core rod 1 is broken from the neck breaking groove 13, and the riveting is finished.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims

1. A self-plugging rivet comprises a core bar, a rivet sleeve, a lock ring, an anvil sheet and a tube body; the head of the core rod is provided with a limiting table, the middle part of the core rod is provided with a neck breaking groove and a lock ring groove for accommodating the lock ring, and the tail part of the core rod is provided with a clamping section; the locking ring groove is positioned between the limiting table and the neck breaking groove; the nail sleeve and the tube body are sleeved on the core rod, the tail of the tube body can be limited by a limit table of the core rod, and the tail of the nail sleeve can be limited by the head of the tube body; after the pipe body and the nail sleeve are limited by the limiting table in sequence, the neck breaking groove is positioned inside the nail sleeve; before locking and mounting, the locking ring is sleeved on a locking ring groove of the core rod and is in clearance fit with the locking ring groove and the nail sleeve respectively, and the locking ring is made of a plastic deformable material; the anvil sheet is sleeved on the core rod and is positioned on one side of the nail sleeve facing the clamping section; the anvil piece has an overlapping surface with the nail sleeve and the lock ring in a direction perpendicular to the axial direction; at least one step-shaped concave-convex ring groove is arranged in the lock ring groove, and a step ring matched with the step-shaped concave-convex ring groove is arranged in the lock ring; the end face of the head of the nail sleeve is provided with a deformation groove with the diameter larger than the outer diameter of the locking ring, and the depth of the deformation groove is smaller than the width of the locking ring.

2. Blind rivet according to claim 1, characterized in that the tubular body is a deformable section.

3. The blind rivet according to claim 1, wherein the head of the pipe body is provided with a stepped ring groove, a ring is sleeved in the stepped ring groove, and the tail of the nail sleeve is tapered with a gradually decreasing outer diameter, extends into the inner side of the ring at the head of the ring and is limited by the ring.

4. Blind rivet according to claim 3, characterized in that the outer surface of the collar is fixed to the inner surface of the tubular body step ring groove, the material of the collar preferably being a polyoxymethylene material.

5. Blind rivet according to claim 1, characterized in that the snap ring groove and the breakneck groove are arranged adjacent to each other.

6. Blind rivet according to claim 1, characterized in that the depth of the deformation groove is less than half the width of the locking ring.

7. Blind rivet according to claim 1, characterized in that the clamping section consists of a number of annular grooves which are evenly distributed along the axis at the tail of the mandrel.

8. Blind rivet according to claim 1, characterized in that the head of the sleeve is of outwardly flared trapezoidal shape.

9. The blind rivet according to claim 1, characterized in that the ring body of the lock ring is provided with an inclined groove, and the lock ring is made of titanium metal.