Arrangement for supervising synchronous displacement of the pist

Details Arrangement for supervising synchronous displacement of the pist Arrangement for supervising synchronous displacement of the pist

1986-03-11

1987-04-14

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

91171, 91170MP, 405294, E21D 2316, E21D 2326

Patent

active

046574433

ABSTRACT:
An arrangement for supervising and controlling synchronous displacement of respective pistons of two cylinder-and-piston units, especially of an advancement and a roof cap displacement unit of a roof support assembly for use in underground mining, comprises first and second conduit systems each having two branches each connected with one of the piston and annular spaces of a different one of the units; a switching valve interposed between pressure and a return conduits and the first and second conduit systems; and first and second shut-off valves respectively interposed in those of the branches of the first and second conduit systems which lead to the piston spaces. Measurement devices measure the extent of displacement of each of the pistons, and a control and regulating arrangement determines from the outputs of the measurement devices which of the piston leads the other and causes that of the first and second shut-off valves which is associated with the leading piston to temporarily close and thus discontinue the action of the pressure differential on the leading piston until synchronism in the displacement of the two pistons is restored.

REFERENCES:
patent: 3968730 (1976-07-01), Lionet
patent: 4343226 (1982-08-01), Ribeiro de Almeida
patent: 4534681 (1985-08-01), Weirich et al.
patent: 4586424 (1986-05-01), Nerlich

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