The technical problem solved by the invention is to provide a thread winding drum enabling the lifting force of lifting points to be consistent and maintaining the balance of the lifting force.
本发明解决的技术问题是提供一种能使起吊点的起吊力一致,保持起吊力平衡的一种螺纹卷筒。
The novel winding drum designs each circle of groove on the surface of a steel drum into a straight groove and an inclined groove distributed at intervals so as to overcome the defects.