JPS618692U - Pump control circuit for cranes, etc. - Google Patents
Pump control circuit for cranes, etc.Info
- Publication number
- JPS618692U JPS618692U JP9249184U JP9249184U JPS618692U JP S618692 U JPS618692 U JP S618692U JP 9249184 U JP9249184 U JP 9249184U JP 9249184 U JP9249184 U JP 9249184U JP S618692 U JPS618692 U JP S618692U
- Authority
- JP
- Japan
- Prior art keywords
- pilot pressure
- valve
- pilot
- pump
- control
- 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
Landscapes
- Control And Safety Of Cranes (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【図面の簡単な説明】
第１図は本考案の速度制御回路図。
第２図は公知の速度制御回路図。
図において；１・・・油圧ポンプ、２・・・方向切換弁
、３・・・リリーフ弁、４・・・油圧モータ、５，６・
・・（モータの）給排管路、７・・・カウンターバラン
ス弁、８・・・ドレーン管路、９・・・操作用油圧ポン
プ、１０・・・パイロット弁、Ｉ Ｌ １ ２−（パ
イロット弁の）２次側管路、１３・・・シャットル弁、
１４・・・（シャットル弁の）出口側の管路、１５・・
・リリーフ弁、１６・・・可変容量形ポンプ、１７・・
・圧力制御弁、１８・・・方向切換弁、１９・・・アク
チュエータ、２０．２０’・・・給排管路、２１・・・
パイロット圧制御弁、２１ａ・・・操作レバー、２２・
・・（高圧選択用）シャトル弁、２３・・・制御部、２
４・・・パイロット圧受圧部、２５・・・パイロット圧
受圧部、２６・・・２位置切換弁、２７・・・パイロッ
ト圧力源、２８・・・ドレーン管路。[Brief Description of the Drawings] Fig. 1 is a speed control circuit diagram of the present invention. FIG. 2 is a known speed control circuit diagram. In the figure: 1... Hydraulic pump, 2... Directional switching valve, 3... Relief valve, 4... Hydraulic motor, 5, 6...
... (Motor) supply and discharge pipe line, 7... Counterbalance valve, 8... Drain pipe line, 9... Hydraulic pump for operation, 10... Pilot valve, I L 1 2- (pilot (valve) secondary side pipe line, 13...shuttle valve,
14...Pipe line on the outlet side (of the shuttle valve), 15...
・Relief valve, 16... Variable displacement pump, 17...
・Pressure control valve, 18...Directional switching valve, 19...Actuator, 20.20'...Supply/discharge pipe, 21...
Pilot pressure control valve, 21a...operation lever, 22.
... (for high pressure selection) shuttle valve, 23 ... control section, 2
4... Pilot pressure receiving section, 25... Pilot pressure receiving section, 26... 2-position switching valve, 27... Pilot pressure source, 28... Drain pipe line.
Claims (1)
イロット弁を有し、そのパイロット圧制御弁の２次圧力
によって可変容量形油圧ポンプを制御すると共に、該ポ
ンプからの吐出油を切換制御する方向切換弁を前記パイ
ロット圧制御弁の操作量に応じて制御するように構成し
たクレーン等の速度制御回路において、可変容量形油圧
ポンプの制御部を最小吐出量がアクチェータを微速で操
作するのに必要な量にセットしておくと共に、−該制御
部にパイロット圧制御弁からの２次圧によって前記ポン
プの吐出量を増減するパイロット圧受圧部とこれに対向
してその作用を打消す第２のパイロット圧受圧部とをも
うけ、かつ第２のパイロット圧受圧部を２位置切換弁を
介してパイロット受圧源とドレン等の低圧部とに切換接
続可能とした事を特徴とするクレーン等のポンプ制御回
路。A directional switching valve that has a pilot valve that switches and controls pilot pressure from a pilot pressure source, controls a variable displacement hydraulic pump using the secondary pressure of the pilot pressure control valve, and also switches and controls discharge oil from the pump. In a speed control circuit for a crane, etc., which is configured to control according to the operation amount of the pilot pressure control valve, the control section of the variable displacement hydraulic pump is controlled so that the minimum discharge amount is the amount necessary to operate the actuator at a slow speed. - The control section includes a pilot pressure receiving section that increases or decreases the discharge amount of the pump according to the secondary pressure from the pilot pressure control valve, and a second pilot pressure opposing the pilot pressure receiving section that counteracts the effect of the secondary pressure. A pump control circuit for a crane or the like, characterized in that the second pilot pressure receiving part can be switchably connected to a pilot pressure receiving source and a low pressure part such as a drain via a two-position switching valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9249184U JPS618692U (en) | 1984-06-22 | 1984-06-22 | Pump control circuit for cranes, etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9249184U JPS618692U (en) | 1984-06-22 | 1984-06-22 | Pump control circuit for cranes, etc. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS618692U true JPS618692U (en) | 1986-01-18 |
Family
ID=30649336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9249184U Pending JPS618692U (en) | 1984-06-22 | 1984-06-22 | Pump control circuit for cranes, etc. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS618692U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5219311U (en) * | 1975-07-28 | 1977-02-10 | ||
| JPS5926601A (en) * | 1982-08-04 | 1984-02-10 | Ishikawajima Harima Heavy Ind Co Ltd | Fluid pressure control device |
-
1984
- 1984-06-22 JP JP9249184U patent/JPS618692U/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5219311U (en) * | 1975-07-28 | 1977-02-10 | ||
| JPS5926601A (en) * | 1982-08-04 | 1984-02-10 | Ishikawajima Harima Heavy Ind Co Ltd | Fluid pressure control device |
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