JPH0291794U - - Google Patents
Info
- Publication number
- JPH0291794U JPH0291794U JP17128288U JP17128288U JPH0291794U JP H0291794 U JPH0291794 U JP H0291794U JP 17128288 U JP17128288 U JP 17128288U JP 17128288 U JP17128288 U JP 17128288U JP H0291794 U JPH0291794 U JP H0291794U
- Authority
- JP
- Japan
- Prior art keywords
- boom
- tip
- main pipe
- hose
- pipe
- 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
- 230000007935 neutral effect Effects 0.000 claims 3
- 238000004904 shortening Methods 0.000 claims 2
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Forklifts And Lifting Vehicles (AREA)
Description
第1図は本考案の実施例を示す油圧回路図、第
2図は高所作業車の側面図、第3図は多段伸縮ブ
ームの概略断面図である。
1……油圧ポンプ、2……ブーム起伏シリンダ
、3……旋回モータ、4……中間ブーム伸縮シリ
ンダ、5……先端ブーム伸縮シリンダ、6……首
振りモータ、7……ウインチモータ、40……ブ
ーム伸縮用方向制御弁、41……第1主管路、4
2……第2主管路、43……第3主管路、44…
…合流管路、47……タンク側ドレン管路、51
……第1選択弁、53……第1ホース、54……
第2ホース、61……第2選択弁、62……バケ
ツト側入力管路、82……バケツト側タンク管路
、83……チエツク弁、84……バケツト側ドレ
ン管路、86……ドレンホース。
FIG. 1 is a hydraulic circuit diagram showing an embodiment of the present invention, FIG. 2 is a side view of an aerial work vehicle, and FIG. 3 is a schematic sectional view of a multistage telescopic boom. DESCRIPTION OF SYMBOLS 1...Hydraulic pump, 2...Boom hoisting cylinder, 3...Swivel motor, 4...Intermediate boom telescopic cylinder, 5...Tip boom telescopic cylinder, 6...Swing motor, 7...Winch motor, 40... ...Boom expansion/contraction directional control valve, 41...First main pipe, 4
2...Second main pipe, 43...Third main pipe, 44...
...merging pipe line, 47...tank side drain pipe line, 51
...First selection valve, 53...First hose, 54...
Second hose, 61...Second selection valve, 62...Bucket side input pipe, 82...Bucket side tank pipe, 83...Check valve, 84...Bucket side drain pipe, 86...Drain hose .
Claims (1)
リンダとによつて伸縮される多段伸縮ブームを旋
回体に起伏自在に取付け、多段伸縮ブームの先端
にバケツトを取付けてなる高所作業車において、
旋回体側に設けられたブーム伸縮用方向制御弁の
伸長位置で油圧源からの圧油が出力され、短縮位
置でタンクに連通され、中立位置でブロツクされ
る第1主管路と、上記方向制御弁の短縮位置で油
圧源からの圧油が出力され、伸長位置および中立
位置でタンクに連通される第2主管路と、上記方
向制御弁の中立位置で油圧源からの圧油が出力さ
れ、伸長位置および短縮位置でブロツクされる第
3主管路とを有し、第2主管路を中間ブーム伸縮
シリンダの短縮動作用油室に接続し、第1主管路
と第3主管路とを合流させてその合流管路を第1
選択弁により第1ホースと、中間ブーム伸縮シリ
ンダの伸長動作用油室とに切換自在に接続し、第
1ホースの先端側を第2選択弁によりバケツト側
に設けられたアクチユエータに対する圧油の給排
を制御する方向制御弁の入力ポート、先端ブーム
伸縮シリンダの伸長動作用油室とに切換自在に接
続し、先端ブーム伸縮シリンダの短縮動作用油室
を第2ホースを介して第2主管路に合流させ、バ
ケツト側方向制御弁のタンクポートに接続された
バケツト側タンク管路をチエツク弁を介して上記
第2ホースの先端側に合流させたことを特徴とす
る高所作業車の油圧回路。 2 バケツト側に設けられたドレン管路をドレン
用ホースを介して旋回体側のドレン管路に接続す
るとともに、第2選択弁のドレンポートをバケツ
ト側のドレン管路に合流させたことを特徴とする
請求項1記載の高所作業車の油圧回路。[Scope of Claim for Utility Model Registration] 1. A multi-stage telescoping boom that is extended and retracted by an intermediate boom telescoping cylinder and a tip boom telescoping cylinder is attached to a revolving body so as to be able to rise and fall freely, and a bucket is attached to the tip of the multi-stage telescoping boom. In a work vehicle,
Pressurized oil from a hydraulic source is outputted at the extended position of the boom extension/retraction directional control valve provided on the rotating body side, communicated with a tank at the retracted position, and blocked at the neutral position; and the directional control valve. Pressure oil from the hydraulic source is output at the shortened position, and pressurized oil is output from the hydraulic source at the neutral position of the directional control valve, and the second main pipe communicates with the tank at the extended and neutral positions. and a third main pipe that is blocked at the intermediate boom position and the shortened position, the second main pipe is connected to the oil chamber for the shortening operation of the intermediate boom telescopic cylinder, and the first main pipe and the third main pipe are merged. The merging pipe is the first
A selection valve connects the first hose and an oil chamber for extension of the intermediate boom telescopic cylinder in a switchable manner, and a second selection valve connects the tip end of the first hose to the actuator provided on the bucket side. The input port of the directional control valve that controls discharge is switchably connected to the oil chamber for extension operation of the telescopic cylinder at the tip of the boom, and the oil chamber for shortening operation of the telescopic cylinder at the tip is connected to the second main pipe through the second hose. A hydraulic circuit for an aerial work vehicle, characterized in that a bucket side tank pipe connected to a tank port of a bucket side directional control valve is merged with the tip side of the second hose via a check valve. . 2. The drain pipe provided on the bucket side is connected to the drain pipe on the rotating body side via a drain hose, and the drain port of the second selection valve is joined to the drain pipe on the bucket side. The hydraulic circuit for an aerial work vehicle according to claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17128288U JPH0291794U (en) | 1988-12-28 | 1988-12-28 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17128288U JPH0291794U (en) | 1988-12-28 | 1988-12-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0291794U true JPH0291794U (en) | 1990-07-20 |
Family
ID=31462977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17128288U Pending JPH0291794U (en) | 1988-12-28 | 1988-12-28 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0291794U (en) |
-
1988
- 1988-12-28 JP JP17128288U patent/JPH0291794U/ja active Pending
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