It is simply a piece of plastic with a large nut and bolt at each end.
这只不过是一块塑料大螺母和螺栓在每个结束。
2
Each coil is wound on the form, then the nut is removed... so that the end of the spool comes off and the coil can be removed.
每个线圈的形式伤口，然后螺母被删除…这样的结束阀芯脱落后的线圈可以被删除。
3
The metal-plastic composite nut, according to Claim 1 and 2, is characterized in that the inner surface at one end of metal insert is cone-shaped sealing surface.