PURPOSE: To eliminate a response delay of a hydraulic equipment relating to operation of an operating lever by controlling an electrifying condition switched relating to a lift switching valve and a flow control valve from a result of detecting an operating amount of the operating lever and from a result of detecting a pressure of pressure oil relating to a lift cylinder.
CONSTITUTION: In the case that a fork lifting joy stick 57 is operated to a fork rising up side, a rising up solenoid 24, hold solenoid 33 and a bypass solenoid 38 are electrified, and pressure oil supplied from a main oil pump 12 through a main oil path 15 is supplied to right/left lift cylinders 28R, 27L, to start a fork 28 raised. Here is detected an operational amount of the joy stick 57 by a potentiometer 58, to change an opening of a lift switching valve 16 in accordance with the detected operational amount. Based on an output of a pressure sensor for detecting a pressure of oil in an oil path 18R, whether a forklift is in a loaded condition or empty condition is judged, and in accordance with this judging result, an electrifying condition is switched relating to a flow switching solenoid 49 of a flow switching valve 50.
| JPS57175699 | LIFTING GEAR |
| WO/2023/287004 | PALLET CONTACT SENSING APPARATUS AND METHOD FOR FORKLIFT |
| JP2002120996 | LIFTING AND LOWERING DEVICE |
Haru Tatsuo
Takayuki Akiyama
