Precise positioning of the swing cylinder

Swing cylinder for performing swing motion, but its accuracy is not very high to swing.For example, a certain type of machine automatic feeding mechanism is required to carry out a precise 90 degree rotation motion. According to the requirement, structure design, if the use of a certain type of SMC cylinder, the swing positioning accuracy (angle) plus or minus 0.2 points, if the use of the swing cylinder of a certain type of FESTO, the swing positioning accuracy (angle) plus or minus 0.1 points. Although from the point of view of the swing angle accuracy is already very high, but this machine swing arms 300mm, converted into the swing arc at the end of the long into the positive and negative 0.5mm, beyond the use requirements. In order to solve the precisionproblem, the swing arm is arranged at the tail end of a dead stop limit. It can solve theproblem of positioning accuracy, but it has brought new problems at the end of shock.To this end, there are two ways to solve. One can die block block made of attached damping buffer die block, another method is cylinder selection selection is equipped with hydraulic or elastic cushion accessories of the cylinder. At the end of the buffer device and can adjust the position of the die block, can solve the problem of accurate positioning of the swing cylinder.