Ram moving method for hydraulic machine, ram movement controller, method for preventing trapping of axial plunger pump used for the machine, and the pump
AssigneeAmada Company, Limited
InventorsKazuhiro Kanno, Nobuaki Ariji
Life of this patent
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Abstract
If an instruction to move a ram (5U) is issued, a ram instructed speed is instructed to be suppressed to a certain warming-up speed not higher than a target speed until a release speed determination section (75) determines that a moving speed of the ram (5U) calculated by a ram moving speed calculation section (51) reaches a predetermined warming-up release speed; if the release speed determination section determines that the moving speed of the ram (5U) reaches the predetermined warming-up release speed, the warming-up speed is released to accelerate the ram (5U) to the target speed.
Claims14
A ram moving method employed in a hydraulic power unit controlling a double acting cylinder using a two-way pump driven by a servo motor, comprising the following steps of:
- issuing an instruction to move the ram;
- and
- after the instruction, suppressing a ram instructed speed to a certain warming-up speed not higher than a target speed until a speed of the ram reaches a predetermined warming-up release speed.
A ram moving controller in a hydraulic power unit controlling a double acting cylinder using a two-way pump driven by a servo motor, comprising:
- a speed distribution processing section controlling the servo motor so as to move the ram according to a ram moving pattern;
- a ram moving speed calculation section calculating a moving speed of the ram;
- and
- a release speed determination section determining whether or not the speed of the ram exceeds a preset warming-up release speed, wherein
- with the configuration, the speed distribution processing section suppresses a ram instructed speed to a certain warming-up speed not higher than a target ram speed until the release speed determination section determines that the ram moving speed exceeds the warming-up release speed, and
- if the release speed determination section determines that the ram moving speed exceeds the warming-up release speed, an instruction is issued so as to accelerate the ram moving speed to the target ram speed.
An axial plunger pump confinement prevention method, comprising the following steps of:
- slightly rotating a valve plate in a rotation direction of a cylinder block of the axial plunger pump;
- and
- overlapping a part of a discharge port provided at the valve plate with a top dead center position of a plunger, thereby preventing confinement at the top dead center position of the plunger.
An axial plunger pump comprising:
- a cylinder block having a plurality of plungers included therein to be able to be reciprocated, the cylinder block provided rotatably;
- and
- a valve plate having a circular arc-shaped discharge port and a circular arc-shaped suction port formed therein, wherein
- with the configuration, the valve plate is provided to be slightly rotatable in a rotation direction of the cylinder block when the rotation direction of the cylinder block is changed.
Dependencies are inferred from the claim text.