JPH0175176U - - Google Patents
Info
- Publication number
- JPH0175176U JPH0175176U JP1987170729U JP17072987U JPH0175176U JP H0175176 U JPH0175176 U JP H0175176U JP 1987170729 U JP1987170729 U JP 1987170729U JP 17072987 U JP17072987 U JP 17072987U JP H0175176 U JPH0175176 U JP H0175176U
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- hydraulic cylinder
- prevention device
- drives
- overload prevention
- 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
- 238000010276 construction Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 2
- 230000008602 contraction Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案に係る建設機械の過負荷防止装
置を備えた油圧回路の回路図、第２図は第１図に
示した油圧回路を用いた油圧シヨベルを示す図で
ある。
１１：可変容量油圧ポンプ、１２，１３：コン
トロールバルブ、１４〜１７：リリーフ弁、１８
：可変リリーフ弁、１８Ａ，１８Ｂ：受圧部、１
９：電磁切換弁、２０：油圧源、２３，２４：リ
ミツトスイツチ。
FIG. 1 is a circuit diagram of a hydraulic circuit equipped with an overload prevention device for construction machinery according to the present invention, and FIG. 2 is a diagram showing a hydraulic excavator using the hydraulic circuit shown in FIG. 1. 11: Variable displacement hydraulic pump, 12, 13: Control valve, 14-17: Relief valve, 18
: Variable relief valve, 18A, 18B: Pressure receiving part, 1
9: Solenoid switching valve, 20: Hydraulic power source, 23, 24: Limit switch.
Claims (1)
第１の部材と連結され第２の部材を駆動する第２
の油圧シリンダと、これら第１および第２の油圧
シリンダの伸縮を駆動制御する油圧回路とを備え
た建設機械に用いられる過負荷防止装置において
、 少なくとも前記第１および第２の油圧シリンダ
のいずれか一方のストロークエンドを検出する検
出手段と、 そのストロークエンド検出により前記油圧回路
から前記油圧シリンダへ供給する油圧出力を低減
する出力低減手段とを具備することを特徴とする
建設機械の過負荷防止装置。[Claims for Utility Model Registration] A first hydraulic cylinder that drives a first member;
a second member connected to the first member and driving the second member;
An overload prevention device used in a construction machine comprising a hydraulic cylinder and a hydraulic circuit that drives and controls expansion and contraction of the first and second hydraulic cylinders, wherein at least one of the first and second hydraulic cylinders An overload prevention device for construction machinery, comprising: a detection means for detecting one stroke end; and an output reduction means for reducing the hydraulic output supplied from the hydraulic circuit to the hydraulic cylinder upon detection of the stroke end. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987170729U JPH0175176U (en) | 1987-11-10 | 1987-11-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987170729U JPH0175176U (en) | 1987-11-10 | 1987-11-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0175176U true JPH0175176U (en) | 1989-05-22 |
Family
ID=31461930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987170729U Pending JPH0175176U (en) | 1987-11-10 | 1987-11-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0175176U (en) |
-
1987
- 1987-11-10 JP JP1987170729U patent/JPH0175176U/ja active Pending