Speed regulation jack and method of operation
OwnerQun Faninventor
Life of this patent
Estimating the term…
Abstract
A speed regulation jack comprises at least one input cylinder and one output cylinder, and parallel hydraulic lines between the input and output cylinders. A differential oil circuit is connected between the inlet cavity and the return cavity of the output cylinder, and a control valve is connected in series between the return cavity of the output cylinder and the oil tank, and this control valve controls the return oil of the return cavity. This speed regulation jack takes the magnitude of the load as its signal and transfers automatically between different lifting speeds, thus enhancing the lifting efficiency of the jack.
Claims16
A speed regulation jack comprising:
- at least one input cylinder and one output cylinder;
- parallel hydraulic lines connected between the input and output cylinders;
- a differential oil circuit that is connected between an inlet cavity and a return cavity of the output cylinder;
- a control valve that is connected in series between the return cavity of the output cylinder and an oil tank to control oil returned to the return cavity;
- and
- an unloading mechanism in a front-end of the return cavity of the output cylinder.
A speed regulation jack comprising:
- at least one input cylinder and one output cylinder;
- parallel hydraulic lines connected between the input and output cylinders;
- a differential oil circuit that is connected between an inlet cavity and a return cavity of the output cylinder;
- a control valve that is connected in series between the return cavity of the output cylinder and an oil tank to control oil returned to the return cavity;
- and
- hydraulic speed regulation cylinders in the hydraulic lines, the hydraulic lines being hydraulic speed regulation lines.
A speed regulation jack comprising:
- at least one input cylinder and one output cylinder;
- parallel hydraulic lines connected between the input and output cylinders;
- a differential oil circuit that is connected between an inlet cavity and a return cavity of the output cylinder;
- a control valve that is connected in series between the return cavity of the output cylinder and an oil tank to control oil returned to the return cavity;
- wherein the hydraulic lines are hydraulic speed regulation lines that comprise at least two hydraulic sub-lines connected in parallel, the hydraulic speed regulation lines taking a load pressure of the output cylinder as a control signal to control an opening and closure of the hydraulic sub-lines.
Dependencies are inferred from the claim text.