The utility model discloses a positioning structure for a herringbone arm of a
spinning frame, which belongs to the technical field of herringbone arms of
spinning frames and comprises a positioning pin rod matched with pin holes in a main arm and a
diagonal arm, at least one telescopic limiting block is arranged on each of two sides of the positioning pin rod, and the limiting blocks on two sides are symmetrical to each other; the transmission part is arranged on the positioning pin rod and used for driving the multiple limiting blocks to synchronously move towards the interior of the positioning pin rod; according to the scheme, the inclined supporting arms on the two sides can be limited through the limiting blocks at the two ends of the positioning pin rod, the positioning pin rod can be prevented from falling out, the situation that an existing positioning pin falls off due to loosening of a fastening screw is avoided, many maintenance requirements are reduced, a large amount of manpower,
material resources and time are saved, and the working efficiency is improved. The production progress of the
spinning frame is effectively ensured, and the cost is reduced; and the transmission part drives the limiting block to move towards the interior of the positioning pin rod without manually pressing the limiting block, so that the limiting block moves more quickly and smoothly, and the operation is convenient.