Movable arm and bucket rod shaft seat connected anti-jag structure

The utility model discloses a movable arm and bucket rod shaft seat connected anti-jag structure, which is characterized in that a front end head of the movable arm is connected with the bucket rod shaft seat through a pin roll with a bolt, the end of the pin roll with the bolt is pretightened through an extension cushion block and a slotting pretightening nut. The slotting pretightening nut is limited by inserting an opening pin into a small hole at one end of the pin roll with the bolt, so that the slotting pretightening nut is not easy to loosen, and pretightening of the connection position of the front end head of the movable arm and the bucket rod shaft seat. Jag caused by torsion of the connection position of the front end head of the movable arm and the bucket rod can be prevented, service life of a working device is prolonged, and the anti-jag structure is simple in structure and low in cost.