n. 撞槌, 推弹器

[机] 捣砂锤

[ noun ]
a tool for driving something with force
<noun.artifact>

Rammer \Ram"mer\ (r[a^]m"m[~e]r), n.
One who, or that which, rams or drives. Specifically:
(a) An instrument for driving anything with force; as, a
rammer for driving stones or piles, or for beating the
earth to more solidity.
(b) A rod for forcing down the charge of a gun; a ramrod.
(c) (Founding) An implement for pounding the sand of a mold
to render it compact.