Anti-loosening performance test device and detection method of threaded connection interface

Abstract

The invention discloses a device for testing the anti-loosening performance of a threaded connection interface. The device comprises a base station, and a group mounted on the base station and including an interface component, a screwing system, a sensing system, a vibration system and a fastening system. The interface component comprises a bolt and a group sleeving the bolt and including a first connected member, a second connected member, and a nut. The screwing system is connected with the head of the bolt through a socket wrench and the output shaft of the screwing system is provided with a total torque rotation speed sensor. The fastening system is used for fixing the second connected member to the base station. The output shaft of the vibration system is connected with the force transmission arm of the first connected member through a pull pressure sensor. The sensing system comprises a fixing device clamped to the nut and a thread torque sensor and an axial force sensor which are successively connected with the fixing device. The axial force sensor is fixed to the base station. The device for testing the anti-loosening performance of a threaded connection interface measures the axial force loss, a fastener support surface friction coefficient, and a thread friction coefficient of an actual interface.

Description

technical field [0001] The invention relates to the technical field of fastener testing tools, in particular to a screw connection interface anti-loosening performance testing device and a testing method thereof. Background technique [0002] The threaded connection interface is a widely used connection structure in mechanical mechanisms. It is mainly composed of connected parts, fasteners and related components. Due to the action of alternating loads, the interface will loosen, thus losing the connection function, resulting in equipment or Component failure or damage, and even safety accidents. The loosening process of the interface can be divided into material loosening and structural loosening according to the loosening mechanism. Material looseness is caused by the loss of axial force caused by the embedded and local plastic deformation of the contact surface between the fastener and the connected part under load. After a certain period of time, the embedded and plastic...

AI Technical Summary

Problems solved by technology

[0004] Due to the complexity of the loosening mechanism and influencing factors of the threaded connection, there is still no general model with simple form and accurate prediction that can calculate the axial force loss and anti-loosening performance of the threaded connection. The more effective method is through the transverse vibration test Machine research on the influence law of anti-loose performance

The current lateral vibration testing machine can only simulate some parameters of the working load and fasteners, and lacks the friction coefficient of the bearing surface of the fastener in the actual interface, the friction coefficient of the thread and the material, size, aperture size and position of the connected part, and the joint surface. The effective testing and simulation of relevant parameters makes it impossible to accurately detect the axial force loss and anti-loosening performance of the threaded connection interface, let alone guide and standardize the manufacturing, design and assembly of fasteners and connected parts in engineering practice

Images