Lateral vibration loosening test of fasteners and effective anti-loose analysis

Threaded joint of any machine

!

If the nut is loose, the preload will decrease or disappear.

!

Will cause various damage

!

Effective locking of threaded joints is an important issue

,

Especially in machines that are subject to large alternating loads and vibrations.

!

The reliability of the bolt fastening connection to lock loose is particularly important.

Analysis of the causes of loose fasteners:

1

Insufficient bolt preload

"

Bolt installation does not meet tightening torque requirements

2

,

Lack of elastic design in bolted joints

3

,

The anti-loose method adopted is not reliable

Traditional anti-loose method

'

Nut plus spring washer

,

Built-in nylon locknut

,

Locking the top nut, etc.

!

Spring washer anti-loose

!

4

Looseness caused by other factors

Several effective anti-loose methods

1

Increase the amount of elastic elongation in bolted joints

2

With new washers and nuts

3

, using high-strength bolts and yield point tightening

4

Using a torque wrench

!

Guarantee tightening torque

5

Applying a binder to the surface of the thread

6

With hydraulic locknut locking

How to detect the anti-loose performance of fastener vibration, we must use the "fastener lateral vibration testing machine" produced by Shanghai Tiancheng, its technology has reached the world advanced level.

The transverse vibration tester can follow

GB/T 10431-2008

,

DIN 65151

Transverse vibration test standard to detect the self-locking performance (anti-loose performance) of fasteners under lateral dynamic loads of a certain frequency and amplitude,

Its model:

TCH-200Z

,

TCH-400Z

,

TCH-600Z

,

TCH-800

Ability to test

M5-M42

Bolt or nut