Shaking control unit for a hydraulic cylinder

Details Shaking control unit for a hydraulic cylinder Shaking control unit for a hydraulic cylinder

1987-09-10

1990-03-13

Corbin, David H.

Hydraulic and earth engineering

Miscellaneous

91417R, 91420, 405302, E21D 2326

Patent

active

049079182

ABSTRACT:
A shaking control unit for a hydraulic cylinder, wherein a first predetermined pressure is admitted to the piston space of the cylinder through a first hydraulic line. A three/two-way valve connects in its zero position a second hydraulic line to a return tank, the second hydraulic line being connected to the first hydraulic line through a check valve. A first control line leads from the first hydraulic line to a first control area of the three/two-way valve. A second control line leads from the second hydraulic line to a second control area of the three/two-way valve. The three/two-way valve is constructed in such a way that, when the pressure in the first hydraulic line reaches a second predetermined pressure which is greater than the first predetermined pressure, the three/two-way valve switches and connects the first hydraulic line to the second hydraulic line. If the piston of the hydraulic cylinder meets an obstacle, the pressure in the first hydraulic line rises above a certain limit value. This pressure acts on the first control area of the valve and switches the valve, so that the high pressure of the first line becomes suddenly effective in the piston space through the valve and the second line. This pressure switches back the valve after a certain period of time over the second control line.

REFERENCES:
patent: 4613257 (1986-09-01), Weirich et al.

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