Anti-loosening riveting bolt and corresponding riveting tool

Abstract

The invention relates to the technical field of threaded fastener connection, in particular to an anti-loosening riveting bolt. Threaded sections with two opposite screwing directions are arranged in a section of length where the extending end of the bolt rod is meshed with the riveting lock ring. The riveting tool for riveting the bolt is formed in the mode that an extrusion die of an outer cylinder and a tension sleeve of an inner cylinder are driven by hydraulic power to move in the axial direction, the inner wall of the front end of the extrusion die is matched with the shape of the locking ring containing the flange, and the inner wall of the front end of the tension sleeve is provided with the same thread as a section of the outer side of the extending end of the bolt rod. Theoretically, no looseness can be achieved. And the riveting extrusion force can be increased, the riveting bolt with the same shape, mass and weight can provide larger tensile load, the size can be reduced, the material consumption can be reduced, the weight of the riveting bolt can be reduced, and the cost can be reduced. The riveting tool does not need a three-jaw spring chuck in the prior art, and is simple in structure, low in cost, convenient to use, few in fault and easy to popularize.

Description

technical field [0001] The invention relates to the technical field of threaded fastener connection, in particular to a riveting bolt structure and a corresponding riveting tool. Background technique [0002] Fasteners are the most widely used mechanical parts, involving machinery, chemical industry, petroleum, construction, transportation, bridges, automobiles, ships, aerospace, military defense, almost everywhere and no fields. [0003] The so-called fastener is a general term for a class of mechanical parts used when two or more parts (or components) are fastened and connected into a whole, and they are also called standard parts on the market. The most commonly used is the bolt connection structure. The bolt is a type of fastener consisting of a head and a screw (a cylinder with external threads). It needs to be matched with a nut to fasten and connect two through holes. Components. This connection form is called bolt connection. When two parts need to be separated, th...

AI Technical Summary

Problems solved by technology

The reason for this diameter reduction is that the ring groove at the end of the inner cylinder is set as a three-jaw spring chuck mechanism for grasping the bolt end. When clamping, the three-jaw spring chuck is opened and then closed. After closing, the mechanism It must be accommodated in the outer cylinder without affecting the mutual axial movement, so the diameter of the end of the bolt has to be reduced. However, this reduction brings great disadvantages, greatly reducing the minimum tensile load of the entire bolt, that is, The pre-tightening force of the bolt after riveting is reduced, which is near the lower limit of the national standard value. This state will reduce the fatigue resistance of the bolted connection pair after installation. Theory and practice have proved that the greater the tension on the bolt during riveting, the greater the locking force after riveting. The clamping force of the ring lock is also greater, which not only improves the fatigue resistance after installation, but also improves the stability of the structure

The tensile force that the bolt can withstand depends on the diameter of the bolt screw, and it depends on the minimum diameter. Due to the structural reasons of the riveting tool, the riveting bolt has to adopt such a structure, which cannot exert the same diameter of the screw rod, and can also give greater force. Extrusion force, can not give full play to its fastening force, which is also a very heavy loss and price

[0011] The connection method of riveted bolts has been introduced for decades. Some insiders say that there has been no improvement in the past 80 years since World War II. The application of force weakens the tightness of the fastening, and the choice of thread has the risk of loosening and hidden dangers

Sometimes have to increase volume and weight, or adopt other methods, of course also bring other adverse consequences

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