The difference between a two-claw puller and a three-claw puller:
1. The two-claw puller has a small space structure, which also brings a problem. The two claws have a relatively large movement direction in the parallel claw direction. Strong rigidity, but much worse in the vertical direction. The two claws are suitable for pick-up, placement and assembly where the force is perpendicular to the grabbing direction, and have poor tolerance for eccentricity.
2. Three claws, larger spatial structure, the advantage is that the rigidity is the same in all directions. Can withstand force and torque in all directions. It is suitable for picking, placing and grabbing under poor working conditions. For a cylinder with the same bore size, the three-claw has a much larger clamping force than the two-claw and can withstand a greater load.