Mining solenoid

Details Mining solenoid Mining solenoid

2007-07-03

2007-07-03

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

Reexamination Certificate

active

10957053

ABSTRACT:
The invention relates to a mining electromagnet for the switching of hydraulic pilot valves or main control valves used in underground mining operations, with a coil which can be connected to an intrinsically-safe power unit, with an armature which can be displaced by application of current to the coil and with an electronic control device20, by means of which the current which is conducted to the coil can be set during the drawing-in phase of the armature to an excitation current, and in its holding phase can be set to a holding current which is lower than the excitation current. According to the invention, a storage means24, 25is allocated to the mining electromagnet2, 3, said storage means being capable of being charged with the power unit voltage of the power unit23, and switched in series with the power unit by the initiation of a switching process for the electromagnets, and which, by means of its discharge during the duration of the drawing-in phase, causes an increase in the voltage imposed at the coil of the electromagnet which is to be switched. In preferred embodiments of the invention, twice as many electromagnets can be switched in the same time and supplied with one common power unit.

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