JPS6231165U - - Google Patents
Info
- Publication number
- JPS6231165U JPS6231165U JP11983985U JP11983985U JPS6231165U JP S6231165 U JPS6231165 U JP S6231165U JP 11983985 U JP11983985 U JP 11983985U JP 11983985 U JP11983985 U JP 11983985U JP S6231165 U JPS6231165 U JP S6231165U
- Authority
- JP
- Japan
- Prior art keywords
- relief valve
- boom
- arm
- pressure
- detection means
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図および第２図は本考案の油圧切換装置の
一実施例を示す説明図で、第１図はこの実施例の
要部を示す回路図、第２図はこの実施例に備えら
れる検出手段を示す説明図、第３図はバツクホウ
フロント付油圧シヨベルを示す側面図である。
２ａ……突起、４……ブームシリンダ、８……
電磁弁、９……リミツトスイツチ、１０……電源
、１４……オーバロードリリーフバルブ、１５…
…別のリリーフバルブ。
1 and 2 are explanatory diagrams showing one embodiment of the hydraulic switching device of the present invention, FIG. 1 is a circuit diagram showing the main parts of this embodiment, and FIG. 2 is a detection diagram provided in this embodiment. FIG. 3 is a side view showing a hydraulic excavator with a backhoe front. 2a...Protrusion, 4...Boom cylinder, 8...
Solenoid valve, 9... Limit switch, 10... Power supply, 14... Overload relief valve, 15...
…another relief valve.
Claims (1)
ンダと、ブームと、このブームを駆動するブーム
シリンダを具備する油圧シヨベルに備えられ、上
記アームシリンダの最伸時を検出し、信号を出力
する検出手段と、この検出手段から出力される信
号に応じて上記ブームシリンダのロツド側圧力を
通常より低い圧力に制限する圧力制限手段とを設
けたことを特徴とする油圧切換装置。 ２ 検出手段はアームとブームとの間の相対的な
回動動作に応じて信号を出力するものであること
を特徴とする実用新案登録請求の範囲第１項記載
の油圧切換装置。 ３ 圧力制御手段が、ブームシリンダのロツド側
に接続されるオーバロードリリーフバルブに連通
可能で、かつ該オーバロードリリーフバルブの設
定圧よりも低い圧力に設定される別のリリーフバ
ルブと、上記オーバロードリリーフバルブと上記
別のリリーフバルブとの間に配置され、検出手段
から出力される信号に応じてオーバロードリリー
フバルブと別のリリーフバルブとを連通させる電
磁弁を有することを特徴とする実用新案登録請求
の範囲第１項記載の油圧切換装置。[Claims for Utility Model Registration] 1. A hydraulic excavator equipped with an arm, an arm cylinder that drives the arm, a boom, and a boom cylinder that drives the boom, which detects when the arm cylinder is fully extended. A hydraulic switching device comprising: a detection means for outputting a signal; and a pressure limiting means for limiting the rod side pressure of the boom cylinder to a pressure lower than normal in response to the signal output from the detection means. . 2. The hydraulic switching device according to claim 1, wherein the detection means outputs a signal in response to relative rotational movement between the arm and the boom. 3. The pressure control means is capable of communicating with the overload relief valve connected to the rod side of the boom cylinder, and is set to a pressure lower than the set pressure of the overload relief valve, and the overload relief valve is connected to the overload relief valve. Registration of a utility model characterized by having an electromagnetic valve disposed between the relief valve and the above-mentioned another relief valve, which communicates the overload relief valve with the other relief valve in response to a signal output from the detection means. A hydraulic switching device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11983985U JPS6231165U (en) | 1985-08-06 | 1985-08-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11983985U JPS6231165U (en) | 1985-08-06 | 1985-08-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6231165U true JPS6231165U (en) | 1987-02-24 |
Family
ID=31007589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11983985U Pending JPS6231165U (en) | 1985-08-06 | 1985-08-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6231165U (en) |
-
1985
- 1985-08-06 JP JP11983985U patent/JPS6231165U/ja active Pending
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