JPS61173560U - - Google Patents
Info
- Publication number
- JPS61173560U JPS61173560U JP5610485U JP5610485U JPS61173560U JP S61173560 U JPS61173560 U JP S61173560U JP 5610485 U JP5610485 U JP 5610485U JP 5610485 U JP5610485 U JP 5610485U JP S61173560 U JPS61173560 U JP S61173560U
- Authority
- JP
- Japan
- Prior art keywords
- swing
- valve
- free
- pilot
- motor
- 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
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図はこの考案の一実施例を示す回路図、第
２図は従来の回路図である。
１は主ポンプ、２は旋回操作弁、３は旋回モー
タ、６はフリースイング回路、８′はパイロツト
切換え弁、９はフリースイングスイツチ、１０，
１０′は電磁弁、１２′，１３′は管路、１５は
シヤトル弁。
FIG. 1 is a circuit diagram showing an embodiment of this invention, and FIG. 2 is a conventional circuit diagram. 1 is the main pump, 2 is a swing operation valve, 3 is a swing motor, 6 is a free swing circuit, 8' is a pilot changeover valve, 9 is a free swing switch, 10,
10' is a solenoid valve, 12' and 13' are conduits, and 15 is a shuttle valve.
Claims (1)
り切換え制御される旋回操作弁２を介して旋回モ
ータ３へ供給し、該旋回モータ３により上部旋回
体を旋回駆動すると共に、運転室内に設けられた
フリースイングスイツチ９により電磁弁１０を切
換えることにより、上部旋回体のフリースイング
状態が得られるようにしたフリースイング油圧回
路６を設けたものにおいて、上記フリースイング
油圧回路６を旋回操作弁２から旋回モータ３へ供
給される油圧を断続すると共に、遮断時旋回モー
タ３に通じる管路１２′，１３′間を連通するパ
イロツト切換弁８′と、平時は連通ポジシヨン１
０′１に保持され、フリースイングスイツチ９の
オンにより遮断ポジシヨン１０′２に切換えられ
る電磁弁１０′と、パイロツト制御弁５より旋回
操作弁２へ供給されるパイロツト圧の一部を上記
電磁弁１０′を介してパイロツト切換え弁８′へ
供給するシヤトル弁１５とより構成してなるパワ
シヨベルのフリースイング油圧回路。 The discharge pressure of the main pump 1 is supplied to a swing motor 3 via a swing operation valve 2 which is controlled by a pilot control valve 5, and the swing motor 3 drives the upper swing structure to swing. A free swing hydraulic circuit 6 is provided in which a free swing state of the upper rotating structure can be obtained by switching a solenoid valve 10 by a free swing switch 9. A pilot switching valve 8' connects the hydraulic pressure supplied to the motor 3 and communicates between the pipes 12' and 13' leading to the swing motor 3 when shut off, and the communication position 1 during normal times.
The solenoid valve 10' is held at the position 0'1 and is switched to the cutoff position 10'2 when the free swing switch 9 is turned on, and a part of the pilot pressure supplied from the pilot control valve 5 to the swing operation valve 2 is transferred to the solenoid valve 10'. A free-swing hydraulic circuit for a power swivel comprising a shuttle valve 15 that supplies power to a pilot switching valve 8' via a valve 10'.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5610485U JPS61173560U (en) | 1985-04-17 | 1985-04-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5610485U JPS61173560U (en) | 1985-04-17 | 1985-04-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61173560U true JPS61173560U (en) | 1986-10-28 |
Family
ID=30579386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5610485U Pending JPS61173560U (en) | 1985-04-17 | 1985-04-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61173560U (en) |
-
1985
- 1985-04-17 JP JP5610485U patent/JPS61173560U/ja active Pending
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