Multi-coupling device with pressure relief circuit

Multi-coupling device according to the preceding claim, wherein said bayonet coupling means comprise on said fixed plate at least a first C-shaped profile turning its concavity towards the outside of the plate, and on said mobile plate a second C-shaped profile turning its concavity towards the outside.

Multi-coupling device according to the preceding claim, further comprising locking means to stably lock both plates to each other.

Multi-coupling device according to the preceding claim, wherein said locking means comprise a handle hinged on a side surface of said mobile plate, wherein a safety pin, axially mobile along a switching on/off direction substantially perpendicular to the side surface of said mobile plate, is further provided on said hinging point of said handle to the mobile plate and is directly axially moved by means of said handle.

Multi-coupling device according to the preceding claim, wherein said locking means comprise a pair of handles, each hinged on a side of said mobile plate, and a pair of locking pins.

Multi-coupling device according to the preceding claim, wherein said fixed plate comprises a plurality of female couplings, each of said female couplings being a flat-faced coupling comprising at least an adapter coupled with said fixed plate, said adapter having a substantially hollow cylindrical body which coaxially houses a back inner body, also having a hollow cylindrical shape and being axially movable with regard to said adapter, a thrust chamber being defined between said back inner body and said adapter, said female coupling further comprising at least a valve for closing said female coupling, said thrust chamber being hydraulically unbalanced in order to axially advance said back inner body when pressurized, thus causing the advancement of the valve and the hydraulic connection with the male coupling.

Multi-coupling device according to the preceding claim, wherein said thrust chamber of each of said female couplings is in fluid connection with a pipe which is coupled with a main hydraulic line axially running along the female coupling.

Multi-coupling device according to the preceding claim, further comprising a hydraulic circuit connecting to each other the female couplings on said fixed plate.

Multi-coupling device according to the preceding claim, wherein said hydraulic circuit further comprises locking and decompression means which comprise, in turn, at least a mechanical safety catch, manually operable by the user and coupled with pressure relief means which comprise at least a decompression valve.

Multi-coupling device according to the preceding claim, wherein said safety catch comprises at least an operating button to interact, in its axial stroke, with a decompression shaft which, in turn, interacts with a decompression valve of said pressure relief means, thus opening it, said operating button being at least partially inserted in a pawl and comprising a guide pin to be inserted in a corresponding helical guide groove formed on said pawl, said operating button having to be pushed and rotated to operate said decompression valve.

Multi-coupling device according to the preceding claim, wherein said hydraulic circuit further comprises at least a maximum pressure valve and at least an accumulator.

Multi-coupling device according to the preceding claims, wherein said safety catch and said accumulator allow the disconnection of the mobile plate without having to reduce the hydraulic pressure in the circuit of the operating machine.