JPS6414260U - - Google Patents
Info
- Publication number
- JPS6414260U JPS6414260U JP10972787U JP10972787U JPS6414260U JP S6414260 U JPS6414260 U JP S6414260U JP 10972787 U JP10972787 U JP 10972787U JP 10972787 U JP10972787 U JP 10972787U JP S6414260 U JPS6414260 U JP S6414260U
- Authority
- JP
- Japan
- Prior art keywords
- boom
- valve
- group
- limit switch
- hydraulic
- 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 4
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第1図はこの考案にかかる第1実施例油圧回路
図、第2図は第1図のC部詳細図、第3図はこの
考案にかかる第2実施例油圧回路図、第4図は従
来技術油圧回路図である。
1……ブーム第1弁、2,29,40……ブー
ム第2弁、3……ブームシリンダ、4……ブーム
用リモコン弁、5……第1ポンプ、6……第2ポ
ンプ、9……ブーム、12……パイロツト弁、3
0,43……電磁弁、32……リミツトスイツチ
。
Fig. 1 is a hydraulic circuit diagram of a first embodiment of this invention, Fig. 2 is a detailed view of section C in Fig. 1, Fig. 3 is a hydraulic circuit diagram of a second embodiment of this invention, and Fig. 4 is a conventional hydraulic circuit diagram. Technical hydraulic circuit diagram. 1... Boom first valve, 2, 29, 40... Boom second valve, 3... Boom cylinder, 4... Boom remote control valve, 5... First pump, 6... Second pump, 9... ...Boom, 12...Pilot valve, 3
0,43...Solenoid valve, 32...Limit switch.
Claims (1)
タ制御用切換弁を2個のグループA,Bに分け、
そのグループA内にブーム第1弁を、かつ、グル
ープB内にブーム第2弁を設け、また、グループ
A、グループBのそれぞれ圧油供給源として第1
ポンプ、第2ポンプを配置した油圧回路において
、ブーム用リモコン弁のブーム上昇用パイロツト
弁と、ブーム第1弁またはブーム第2弁のいずれ
か一方のブーム上昇用パイロツト圧受圧部とを連
通するパイロツト油路に油路開閉用電磁弁を設け
、一方、油圧シヨベル用上部旋回体のメインフレ
ーム付近にリミツトスイツチを設け、ブーム最高
上昇位置手前にてブームフート部の一部位を上記
リミツトスイツチの接触子に当接可能とするとと
もに、上記リミツトスイツチと電磁弁とを連結し
て構成したことを特徴とする油圧シヨベルの油圧
回路。 The switching valves for controlling various hydraulic actuators installed on the hydraulic excavator are divided into two groups A and B.
A first boom valve is provided in group A, a second boom valve is provided in group B, and a first boom valve is provided as a pressure oil supply source for each of group A and group B.
In a hydraulic circuit in which the pump and the second pump are arranged, a pilot valve that communicates between the boom lifting pilot valve of the boom remote control valve and the boom lifting pilot pressure receiving part of either the boom first valve or the boom second valve. A solenoid valve for opening and closing the oil passage is installed in the oil passage, and a limit switch is installed near the main frame of the upper revolving structure for the hydraulic excavator, and a part of the boom foot is brought into contact with the contact of the limit switch before the boom reaches its highest raised position. A hydraulic circuit for a hydraulic excavator, characterized in that the limit switch and the solenoid valve are connected to each other.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10972787U JPS6414260U (en) | 1987-07-16 | 1987-07-16 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10972787U JPS6414260U (en) | 1987-07-16 | 1987-07-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6414260U true JPS6414260U (en) | 1989-01-25 |
Family
ID=31346234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10972787U Pending JPS6414260U (en) | 1987-07-16 | 1987-07-16 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6414260U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009144505A (en) * | 2007-12-17 | 2009-07-02 | Volvo Construction Equipment Ab | Boom shock absorber for sharp turning type excavator, and its control method |
-
1987
- 1987-07-16 JP JP10972787U patent/JPS6414260U/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009144505A (en) * | 2007-12-17 | 2009-07-02 | Volvo Construction Equipment Ab | Boom shock absorber for sharp turning type excavator, and its control method |