ES216520A1 - Improvements in drive hydraulic devices for drilling machines (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improvements in hydraulic motive devices for drilling machines, constituting a circuit formed by a pump that extracts the liquid from a reservoir, propelling it towards a distributor control by intermediating a safety valve and another pressure regulator, which has corresponding drains towards the reservoir, the said dispensing control being formed by two bodies or cylinders in which respective double sealing pistons move, which are put in position by means of corresponding electromagnets, from which distributor split two branches which alternately put it in communication with the ends of another cylinder in the one that plays a piston whose rod is attached to the mobile table of the machine, there being also in the aforementioned distributor two liquid evacuation outlets communicating one of them with a drain towards the tank and starting from the other a conduit that bifurcates, communicates : pro a branch, with a valve r choke valve of constant output without variation of the liquid coming from the distributor, and by the other branch with a circuit that includes a choke and a speed valve, ends at a lower entrance of the regulating valve and with a drain towards the tank, giving the circumstance of presenting said speed valve a piston that when moving inwards overcoming the resistance of a spring by the action of a stop of inclined plane provided in a convenient place of the mobile table, closes the steps, successively producing the action of another stop also provided in the mobile table of the machine, which drives a switch that by changing the contacts of the electrical circuit containing the above-mentioned electromagnets, leaves one of them alternately without current to connect the other, this circuit also including a push-switch for the start-up. (Machine-translation by Google Translate, not legally binding)