Track levelling and tamping machine with hydraulic pressure cont

Details Track levelling and tamping machine with hydraulic pressure cont Track levelling and tamping machine with hydraulic pressure cont

1982-01-21

1984-01-03

Reese, Randolph

Railways

Track layers

Track raising car

104 12, E01B 2717

Patent

active

044236840

ABSTRACT:
In a mobile track leveling and tamping machine, a hydraulic control system operates a drive for reciprocating vibratory tamping tools. The system includes a hydraulic fluid containing receptacle, a three-way proportional electro-hydraulic valve having an outlet connected to one cylinder chamber of the drive and another outlet connected to the hydraulic fluid containing receptacle, a hydraulic pressure regulator steplessly adjustable to a desired maximum tamping pressure exerted by reciprocation of the tools, a differential element having two inputs and an output connected to the valve, and a threshold value stage connected between the transmitter and one of the differential element inputs, the other input being connected to the regulator and a third outlet of the valve being connected to the other cylinder chamber whereby the hydraulic pressure therein is controlled in response to the threshold value.

REFERENCES:
patent: 3807311 (1974-04-01), Plasser et al.
patent: 3895583 (1975-07-01), Theurer
patent: 3910195 (1975-10-01), Theurer

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