JPS6429502U - - Google Patents
Info
- Publication number
- JPS6429502U JPS6429502U JP6970587U JP6970587U JPS6429502U JP S6429502 U JPS6429502 U JP S6429502U JP 6970587 U JP6970587 U JP 6970587U JP 6970587 U JP6970587 U JP 6970587U JP S6429502 U JPS6429502 U JP S6429502U
- Authority
- JP
- Japan
- Prior art keywords
- valve section
- jack
- switchable
- inflow
- allows
- 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
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の油圧回路の実施例、第２図は
その一部変形例、第３図は従来例、第４図はクロ
ーラクレーンの側面図である。
１：下部走行体、２：上部旋回体、３（３Ａ〜
３Ｄ）：方向切替弁、４Ａ，４Ｂ：管路、５：セ
ルフシールカツプリング、６：油圧配管、７：絞
り弁、８：ダブルパイロツトオペレートチエツク
、９：ジヤツキシリンダ、１０Ａ，１０Ｂ：管路
、１１Ａ，１１Ｂ：圧力スイツチ、１２Ａ，１２
Ｂ：保持用バルブ、１３Ａ，１３Ｂ：ジヤツキシ
リンダ、１４Ａ，１４Ｂ：ポート、１５：負荷部
材、１６：固定部材、１７：油圧ポンプ、１８：
リリーフバルブ、１９Ａ，１９Ｂ：ソレノイドの
作動回路。
FIG. 1 shows an embodiment of the hydraulic circuit of the present invention, FIG. 2 shows a partially modified example thereof, FIG. 3 shows a conventional example, and FIG. 4 shows a side view of a crawler crane. 1: Lower traveling body, 2: Upper revolving body, 3 (3A~
3D): Directional switching valve, 4A, 4B: Piping, 5: Self-seal coupling, 6: Hydraulic piping, 7: Throttle valve, 8: Double pilot operator check, 9: Jack cylinder, 10A, 10B: Piping , 11A, 11B: Pressure switch, 12A, 12
B: Holding valve, 13A, 13B: Jack cylinder, 14A, 14B: Port, 15: Load member, 16: Fixing member, 17: Hydraulic pump, 18:
Relief valve, 19A, 19B: Solenoid operating circuit.
Claims (1)
するよう直列に配設された２個一対のジヤツキシ
リンダのポートをそれぞれ保持用バルブを介して
油圧源に接続し、該保持用バルブは、前記ジヤツ
キシリンダへの流入のみを許す逆止弁セクシヨン
と流入流出を共に許す絞り弁セクシヨンとに切替
可能であり、常時は逆止弁セクシヨン側に位置す
るが、一方のジヤツキシリンダへの供給圧が所定
値を超えたとき他方に接続された保持用バルブが
絞り弁セクシヨンに切替えられることを特徴とす
るジヤツキシリンダの油圧回路。 The ports of a pair of jack cylinders arranged in series so that when one expands, the other contracts by an equal amount in the same direction are each connected to a hydraulic power source via a holding valve, and the holding valve is configured to: It is switchable between a check valve section that only allows inflow to the jack cylinder and a throttle valve section that allows both inflow and outflow, and is normally located on the check valve section side, but the supply to one of the jack cylinders is switchable. A hydraulic circuit for a jack cylinder, characterized in that a holding valve connected to the other end is switched to a throttle valve section when the pressure exceeds a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6970587U JPS6429502U (en) | 1987-05-12 | 1987-05-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6970587U JPS6429502U (en) | 1987-05-12 | 1987-05-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6429502U true JPS6429502U (en) | 1989-02-22 |
Family
ID=31294977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6970587U Pending JPS6429502U (en) | 1987-05-12 | 1987-05-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6429502U (en) |
-
1987
- 1987-05-12 JP JP6970587U patent/JPS6429502U/ja active Pending