Device for clamping wheel rims for vehicles on repair workshop machines, particularly tyre-changing machines or the like

The device (1) for locking wheel rims for vehicles on repair workshop machines, particularly tyre-changing machines or the like, comprises a supporting structure (2) associable in rotation around a work axis (B) with a repair workshop machine (A) or the like and having a resting portion (3) of the wheel rim for vehicles, a locking element (4) associable in a removable way with a fastening element (5) on the supporting structure (2), and movement means (6, 7, 8, 34) comprising: - a main actuator cylinder (6) with fluid operation suitable for moving the fastening element (5) from a release position, wherein the locking element (4) is disengaged from the rim, to a retention position, wherein the locking element (4) is engaged on the rim; - an auxiliary actuator cylinder (7, 8) with fluid operation suitable for moving the fastening element (5) from the release position to the retention position of the rim; and - a feeding mouth (9) of a fluid connected to at least one between the main actuator cylinder (6) and the auxiliary actuator cylinder (7, 8).