Compared with common anchor centering bracket, the anchor rod with centering rings is more convenient and rapid in construction, has low cost and good effect.
本实用新型比目前常用的锚杆对中支架的施工更方便快捷，成本低、效果好。
2
The invention discloses a novel labyrinth compressor packing which is capable of automatic centering with a piston rod. The packing is provided with magnets.