JPH0192501U - - Google Patents
Info
- Publication number
- JPH0192501U JPH0192501U JP18846387U JP18846387U JPH0192501U JP H0192501 U JPH0192501 U JP H0192501U JP 18846387 U JP18846387 U JP 18846387U JP 18846387 U JP18846387 U JP 18846387U JP H0192501 U JPH0192501 U JP H0192501U
- Authority
- JP
- Japan
- Prior art keywords
- relief valve
- relief
- boom cylinder
- valve
- solenoid valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009412 basement excavation Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 1
Description
第１図は本考案にかかるブームシリンダのリリ
ーフセツト圧切換装置の回路図、第２図は本考案
が適用される掘削機械の作業の状態を示す側面図
である。
１…ブームシリンダ、１ａ…ヘツド、２ａ，２
ｂ…主回路、３…リリーフ弁、４…ポンプ、５…
電磁弁、６，７…管路、８…スイツチ、９…電気
信号。
FIG. 1 is a circuit diagram of a boom cylinder relief set pressure switching device according to the present invention, and FIG. 2 is a side view showing the working state of an excavation machine to which the present invention is applied. 1...Boom cylinder, 1a...Head, 2a, 2
b...Main circuit, 3...Relief valve, 4...Pump, 5...
Solenoid valve, 6, 7...pipe line, 8...switch, 9...electric signal.
Claims (1)
に、セツト圧可変のリリーフ弁を設け、このリリ
ーフ弁にポンプからのパイロツト管路を電磁弁を
介して連結するとともに、スイツチからの信号に
より該電磁弁を開に切換えたとき、前記リリーフ
弁はより高圧状態にセツトされることを特徴とす
るブームシリンダのリリーフセツト圧切換装置。 A relief valve with variable set pressure is provided in the main circuit on the head side of the boom cylinder of the excavation machine, and the pilot pipe line from the pump is connected to this relief valve via a solenoid valve, and the solenoid valve is activated by a signal from a switch. 1. A relief set pressure switching device for a boom cylinder, characterized in that when the relief valve is switched to open, the relief valve is set to a higher pressure state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18846387U JPH0192501U (en) | 1987-12-11 | 1987-12-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18846387U JPH0192501U (en) | 1987-12-11 | 1987-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0192501U true JPH0192501U (en) | 1989-06-16 |
Family
ID=31479553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18846387U Pending JPH0192501U (en) | 1987-12-11 | 1987-12-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0192501U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996006988A1 (en) * | 1994-08-30 | 1996-03-07 | Komatsu Ltd. | Hydraulic circuit for boom cylinder of hydraulic shovel |
-
1987
- 1987-12-11 JP JP18846387U patent/JPH0192501U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996006988A1 (en) * | 1994-08-30 | 1996-03-07 | Komatsu Ltd. | Hydraulic circuit for boom cylinder of hydraulic shovel |
| US5855159A (en) * | 1994-08-30 | 1999-01-05 | Komatsu Ltd. | Hydraulic circuit for a boom cylinder in a hydraulic shovel |