Fastener testing device

A testing device and fastener technology, applied in the field of fastener testing devices, can solve the problems of no testing device and the inability to effectively evaluate the anti-loosening reliability of the fastening structure, and achieve the effect of improving the detection accuracy

Pending Publication Date: 2022-04-12
COMBA TELECOM TECH (GUANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above two types of test methods are aimed at the performance test of fasteners in their transverse direction, but in practical applications, the dynamic load of many structural nodes is not only transverse, but also axial, or a combination of the two , the fasteners on the nodes are loaded in the same direction, and the train connection mechanism is a typical example: the repeated starting of the locomotive, the braking of the train and the impact of the carriages cause the load-bearing fasteners to alternate in the axial direction. The loosening of the
It can be seen that the test results of the two types of test methods cannot effectively evaluate the anti-loosening reliability of the fastening structure in practical applications, and there is no test device for other test methods in the prior art

Method used

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Embodiment 1

[0043] The present embodiment provides a fastener testing device, comprising a vibrating base 1 and a testing assembly 2; the vibrating base 1 is driven to reciprocate vibrating motion, and has a vibration direction; the testing assembly 2 is provided with a mounting position 21; the mounting position 21 is used for Install the fastener to be tested, have an axis, and be coaxial with the fastener to be tested; also include movable parts, in order to distinguish the movable parts of the following embodiment 2, the movable parts of this embodiment are named as the first movable parts; the described The first movable part is installed on the vibration base 1, and the vibration base 1 drives the first movable part to perform reciprocating impact movement along the vibration direction; the test assembly 2 is fixedly installed on the first movable part, and the axis is parallel to the vibration direction or forms an acute angle with the vibration direction.

[0044] The axis in this ...

Embodiment 2

[0055] This embodiment provides a fastener testing device. The difference from Embodiment 1 is that this embodiment is used for oblique testing. An acute angle with a fixed angle, the difference in the specific structure lies in the movable part, and the movable part in this embodiment is named as the second movable part.

[0056] like Figure 7 As shown, the second movable part includes a mounting base plate 301 and four wedge blocks 302 . The four wedges 302 protrude from the outer surface of the mounting base 301 and are evenly distributed around the central axis of the mounting base 301 in a cross shape. The outer surface of the installation base plate 301 is a vertical surface, and the outer surface of each wedge block 302 is an inclined plane. slope.

[0057] The test assembly 2 is arranged on the slope of the wedge-shaped block 302, the bottom of the counterweight 23 is closely attached to the slope, and the axis of the mounting position 21 in the opening cavity of t...

Embodiment 3

[0059] The evaluation indexes of conventional sleeve impact test for fasteners are loosening angle and loosening time. However, under certain conditions (such as the fastening process of yield point method), it is difficult for the fastener to be tested to loosen within the standard test time. The performance of the fastener cannot be evaluated at this time.

[0060] In order to overcome the shortcomings of the conventional sleeve impact test, and to take into account the influence of temperature on the performance of the fastener, this embodiment provides a test method for the fastener testing device of Embodiment 1 and 2. The specific steps are as follows:

[0061] 1) Select the material and surface of the counterweight to make the test components fit the assembly process and practical application; the test components will not be installed on the installation base for the time being;

[0062] 2) To test the static inspection torque T1, use a dial or digital display torque wr...

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Abstract

The invention relates to the technical field of fastener detection, in particular to a fastener testing device. The fastener testing device comprises a vibration base and a testing assembly. The vibration base performs reciprocating vibration motion and has a vibration direction; the test assembly is provided with a mounting position; the mounting position is used for mounting a fastener to be detected, is provided with an axis and is coaxial with the fastener to be detected; the device further comprises a movable part. The movable part is mounted on the vibration base, and the vibration base drives the movable part to do reciprocating impact motion in the vibration direction; the testing assembly is fixedly installed on the movable part, and the axis is parallel to the vibration direction or forms an acute angle with the vibration direction. The testing device provides testing conditions of axial testing and oblique testing, continuous and effective impact is formed on the fastener to be tested, and the testing device has high detection accuracy.

Description

technical field [0001] The present invention relates to the technical field of fastener testing, and more particularly, to a fastener testing device. Background technique [0002] Threaded fasteners are widely used parts in industrial products. While they are connected, they will loosen due to the long-term impact of various vibration loads, resulting in equipment failure and even safety accidents. All kinds of fasteners need to be evaluated for anti-loosening performance before engineering application. [0003] At present, there are two main test methods used to evaluate the anti-loosening performance of threaded fasteners: sleeve impact test (also known as NAS vibration test method) and lateral vibration test (also known as Juncker test method). The sleeve impact test originated from NASA and has now been formulated as a national military standard (GJB 715.3A-2002). The loading method and shock vibration conditions of this method are closer to the actual application statu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02G01M7/08
Inventor 张友肖飞夏旺
Owner COMBA TELECOM TECH (GUANGZHOU) CO LTD
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