hard to say … without the files. You've only attached the ASM without the included components. Please use "Pack and Go" (find it in the pull down menu "file") to make a ZIP with all the necessary content.
sorry brother i've been updtae the files
Sry to say, but your updated file isn't working.
Got reference failures on open, missing files warnings and so on.
Have you saved your assembly and used "Pack and Go" - doesn't seem so...
pack and go ，like that
... maybe saveas a *.sldprt and combine all the bodies as one?
We're missing the long tube part file.
There is no simulation study in the assembly file.
A few possible problems for the mesher:
There is a perfect geometric problem in the elbow, a double-tangency.
Some round parts meet flats with outside tangency.
Some round parts meet with perfect fit or very small gap.
The last two should not be a problem if all bodies are meshed independently. If using bonded contact mesh compatibility will be a challenge for the mesher.
Should i finish the third step to do the mesh
Retrieving data ...