Winch for pipelayer and pipelayer equipped with same

摘要

A restraining roller of a hook winch has a roller middle part and first and second roller end parts. The roller middle part is formed in a columnar shape. Each of the first and second roller end parts is formed in a roughly circular truncated cone shape. The widths of the first and second roller end parts are greater than the diameter of a wire rope. A difference in diameter between an inner end and outer end of each of the first and second roller end parts is less than the diameter of the wire rope. Taper angles of the first and second roller end parts are different from each other.

主权项

1. A winch for a pipelayer, comprising:
a drum about which a wire rope is wound; and a restraining roller disposed along a width direction of the drum, the restraining roller restraining the wire rope wound about the drum onto a surface of the drum, wherein the restraining roller includes:
a roller part being formed in a cylindrical shape; androller end parts being disposed on a first end side and a second end side of the roller part in the width direction, each of the roller end parts being formed in a roughly circular truncated cone shape with a radius reduced in proportion to a distance from the first end side or the second end side, a width of each of the roller end parts is greater than a diameter of the wire rope, a difference in diameter between an inner end and an outer end of each of the roller end parts is less than the diameter of the wire rope, and where a taper angle is defined as an angle formed between a line arranged in parallel to a surface of the roller part and a line arranged in parallel to a surface of each of the roller end parts in a plan view seen in a direction perpendicular to a center axis of the restraining roller, the taper angle of the roller end part on the first end side and the taper angle of the roller end part on the second end side are different from each other.