Improvements bringest to the hydraulic presses, and in particular at their control systems of the approach speed

摘要

Hydraulic press comprising a jack controlled by a distributor, the slide is made integral with a rod thread engaged in a nut mounted in the piston of the jack, the assembly rod thread - slide valve of the distributor being drives in rotation by a control motor, this press being characterized in that said rod thread 18 is provided with an axial bore 20, and it travels in a cylindrical chamber 28 provided for in the piston 10 of the jack of the press, the said bore being put into communication with the source of hydraulic pressure during the rotation of the control motor 22 driving the assembly rod thread 18 - slide valve of the distributor 16 so that said rod forms a piston of approach to the jack of the press, to descend this cylinder has a fast approach speed directly bound to the speed of rotation of the control motor 22.