JPH02139947U - - Google Patents
Info
- Publication number
- JPH02139947U JPH02139947U JP4977489U JP4977489U JPH02139947U JP H02139947 U JPH02139947 U JP H02139947U JP 4977489 U JP4977489 U JP 4977489U JP 4977489 U JP4977489 U JP 4977489U JP H02139947 U JPH02139947 U JP H02139947U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- cylinder
- bucket
- switching valve
- electromagnetic switching
- 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.)
- Granted
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請求項第１項のクラ
ムシエル用シリンダ回路図、第２図はこの考案に
かかる請求項第２項のクラムシエル用シリンダ回
路図、第３図はバツクホーバケツトをそなえた油
圧シヨベルの側面図、第４図はクラムシエルバケ
ツトをそなえた油圧シヨベルの側面図、第５図は
従来技術のシリンダ回路図である。
７……バツクホーバケツト用シリンダ、９……
クラムシエルバケツト、１０……クラムシエルバ
ケツト用シリンダ、１１……ロツド側油室、１３
……バケツト切換弁、２３……可変圧力リリーフ
弁、２４……増圧作動部、２５……パイロツトポ
ンプ、２６……電磁切換弁、２８……電気回路、
２９……スイツチ、３３……電磁開閉弁。
Fig. 1 is a circuit diagram of a cylinder for a clam shell according to claim 1 of this invention, Fig. 2 is a circuit diagram of a cylinder for a clam shell according to claim 2 of this invention, and Fig. 3 is a circuit diagram of a cylinder for a clam shell according to claim 2 of this invention. FIG. 4 is a side view of a hydraulic excavator equipped with a clam shell bucket, and FIG. 5 is a cylinder circuit diagram of the prior art. 7...Buckhoe bucket cylinder, 9...
Clam shell bucket, 10... Cylinder for clam shell bucket, 11... Rod side oil chamber, 13
... Bucket switching valve, 23 ... Variable pressure relief valve, 24 ... Pressure increase operation section, 25 ... Pilot pump, 26 ... Solenoid switching valve, 28 ... Electric circuit,
29...Switch, 33...Solenoid on-off valve.
Claims (1)
の作業工具として、バツクホーバケツトとクラム
シエルとを互換的に取付け換えして作業を行うよ
うにした油圧シヨベルのバケツト用シリンダ回路
において、クラムシエルバケツト用シリンダのロ
ツド側油室とバケツト切換弁とを連通する油路と
、油タンクとの間に可変圧力リリーフ弁を介設し
、また上記可変圧力リリーフ弁の増圧作動部と、
パイロツトポンプとを連通する油路に電磁切換弁
を介設し、その電磁切換弁を介してパイロツト圧
を上記可変圧力リリーフ弁の増圧作動部に作用可
能とし、電気回路内スイツチを操作したとき上記
電磁切換弁をタンク連通油路位置に切換作動可能
に構成したことを特徴とするクラムシエル用シリ
ンダ回路。 (2) 前記クラムシエルバケツト用シリンダの作
動回路に電磁開閉弁を介設し、電気回路内スイツ
チの操作によりパイロツト回路内前記電磁切換弁
を切換作動せしめたときシリンダ作動回路内上記
電磁開閉弁を遮断油路位置より開通油路位置に切
換作動可能に付設して構成したことよりなる請求
項第１項のクラムシエル用シリンダ回路。[Scope of Claim for Utility Model Registration] (1) A bucket bucket cylinder for a hydraulic excavator, which is used as a work tool for a work attachment attached to the front section and is capable of performing work by interchangeably attaching a bucket bucket and a clam shell. In the circuit, a variable pressure relief valve is interposed between the oil tank and the oil passage that communicates the rod-side oil chamber of the cylinder for clamshell bucket and the bucket switching valve, and a pressure increase of the variable pressure relief valve is provided. An operating part;
An electromagnetic switching valve is interposed in the oil passage communicating with the pilot pump, and the pilot pressure can be applied to the pressure increasing part of the variable pressure relief valve through the electromagnetic switching valve, and when a switch in the electric circuit is operated. A cylinder circuit for a clam shell, characterized in that the electromagnetic switching valve is configured to be able to switch to a tank communication oil path position. (2) An electromagnetic on-off valve is interposed in the operating circuit of the cylinder for the clam shell bucket, and when the electromagnetic switching valve in the pilot circuit is operated by operating a switch in the electric circuit, the electromagnetic switching valve in the cylinder operating circuit is operated. 2. A cylinder circuit for a clam shell according to claim 1, wherein the cylinder circuit is configured to be operable to switch from a cut-off oil passage position to an open oil passage position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4977489U JPH0645492Y2 (en) | 1989-04-26 | 1989-04-26 | Cylinder circuit for clam shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4977489U JPH0645492Y2 (en) | 1989-04-26 | 1989-04-26 | Cylinder circuit for clam shell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02139947U true JPH02139947U (en) | 1990-11-22 |
| JPH0645492Y2 JPH0645492Y2 (en) | 1994-11-24 |
Family
ID=31567749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4977489U Expired - Lifetime JPH0645492Y2 (en) | 1989-04-26 | 1989-04-26 | Cylinder circuit for clam shell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0645492Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007303122A (en) * | 2006-05-10 | 2007-11-22 | Komatsu Ltd | Hydraulic control device for hydraulic shovel |
| JP2013167108A (en) * | 2012-02-16 | 2013-08-29 | Hitachi Constr Mach Co Ltd | Hydraulic circuit for deep drilling machine |
-
1989
- 1989-04-26 JP JP4977489U patent/JPH0645492Y2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007303122A (en) * | 2006-05-10 | 2007-11-22 | Komatsu Ltd | Hydraulic control device for hydraulic shovel |
| JP4627280B2 (en) * | 2006-05-10 | 2011-02-09 | 株式会社小松製作所 | Hydraulic control device of excavator |
| JP2013167108A (en) * | 2012-02-16 | 2013-08-29 | Hitachi Constr Mach Co Ltd | Hydraulic circuit for deep drilling machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0645492Y2 (en) | 1994-11-24 |
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