The article says...
Shen also points out that this new discovery sheds light on how Qing, two wooden sticks usually discovered alongside the weapon, were used to maintain and transport the crossbows in ancient times. Although ancient documents often mentioned Qing, its function had never been clearly identified until this recent discovery.
I have no clue what what means, but I suspect that the structures that Hero is pointing to are the mysterious Quing.
An archeologist, (who may or may not understand crossbows) talks to journalist, and then it all gets translated from Chinese to English. It's no wonder it leaves us scratching our heads. We can only hope that further publication on Quing includes some diagrams.