Riveting tool for anti-loosening riveting bolt

Abstract

The invention relates to the technical field of threaded fastener connection, in particular to a riveting tool for riveting bolts, which is formed by mutually axially moving an extrusion die (5) of an outer cylinder and a tension sleeve (4) of an inner cylinder under the driving of hydraulic power, and the shape of the inner wall of the front end of the extrusion die (5) is matched with that of a locking ring (2) with a flange. The inner wall of the front end of the tension sleeve (4) is provided with threads with the same screwing direction and nominal parameters as the threads of the outer section of the extending end of the bolt rod, can be rotationally connected and axially moves along with the tension sleeve (4). The riveting tool does not need a three-jaw spring chuck in the prior art, is simple in structure, low in cost, convenient to use, few in fault and easy to popularize, and completely achieves the functions that the diameters of all the lengths of the bolt rod are consistent, and the thread section anti-loosening riveting bolt pair with two opposite screwing directions is arranged in the section, meshed with the riveting locking ring, of the bolt rod.

Description

technical field [0001] The invention relates to the technical field of threaded fastener connection, in particular to a riveting tool for riveting bolts. 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. Component. This connection form is called bolt connection. When two parts need to be separated, the two parts can be easily ...

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, and there has been no improvement for about 80 years since World War II. When the ring groove is selected for installation, no axial force is applied to weaken the tightness of the fastening. If the thread is selected, there is a 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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