Title:
【発明の名称】掘削機の流量制御装置
Document Type and Number:
Japanese Patent JP2677983
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent the generation of impact and the hunting phenomenon due to the quick acceleration and the lowering of the swing speed by controlling the current output to an electromagnetic proportional pressure-reduction valve in response to the existence of each detecting signal of the boom operation, arm operation and the swing. SOLUTION: Operation detecting signals are generated from a boom operation detecting switch 226, an arm operation detecting switch 234 and a swing detecting switch 242 on the basis of the operation of each joy stick 117, 218, 220, and input to an electronic control unit 216. In the case where any one of each operation detecting signal is not generated, the electronic control unit 216 outputs the predetermined reference current to an electromagnetic proportional pressure-reduction valve 209 so that the reference control pressure is supplied to discharge flow rate control spools 124, 125. In the case where any one of the boom or the arm operation detecting signals is generated, the electronic control unit 216 outputs the delay control current to the pressure-reduction valve 209 so that the delay control pressure is supplied to the discharge capacity control spools 124, 125. In the case where the swing detecting signal is generated, the control pressure is not supplied.
Inventors:
Cho Jongbun
Application Number:
JP16273396A
Publication Date:
November 17, 1997
Filing Date:
June 24, 1996
Export Citation:
Assignee:
Ou Heavy Industry Co., Ltd.
International Classes:
E02F9/20; E02F9/22; E02F9/24; F15B11/02; (IPC1-7): E02F9/22; E02F9/20; E02F9/24; F15B11/02
Domestic Patent References:
| JP7190004A | ||||
| JP6336751A | ||||
| JP6336750A |
Attorney, Agent or Firm:
Hidekazu Miyoshi (1 outside)