JPS6120901U - Pump control circuit for cranes, etc. - Google Patents

Pump control circuit for cranes, etc.

Info

Publication number
JPS6120901U
JPS6120901U JP10446584U JP10446584U JPS6120901U JP S6120901 U JPS6120901 U JP S6120901U JP 10446584 U JP10446584 U JP 10446584U JP 10446584 U JP10446584 U JP 10446584U JP S6120901 U JPS6120901 U JP S6120901U
Authority
JP
Japan
Prior art keywords
pilot
servo piston
pressure
receiving part
control circuit
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
Application number
JP10446584U
Other languages
Japanese (ja)
Inventor
和明 井上
Original Assignee
住友重機械工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 住友重機械工業株式会社 filed Critical 住友重機械工業株式会社
Priority to JP10446584U priority Critical patent/JPS6120901U/en
Publication of JPS6120901U publication Critical patent/JPS6120901U/en
Pending legal-status Critical Current

Links

Landscapes

  • Fluid-Pressure Circuits (AREA)
  • 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】[Brief explanation of drawings]

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）駆動回路、７・・・カウンターバ
ランス弁、訃”・・戻り回路、９・・・操作用油圧ポン
プ、１０・・・パイロット弁、１１，１２・・・（パイ
ロット弁の）２次側回路、１３・・・シャットル弁、１
４・・・（シャットル弁の）出口側の管路、５・・・リ
リーフ弁、１６・・・可変容量形油圧ポンプ、１７・・
・パイロット油圧源、１８・・・サーボピストン、１８
ａ，１８ｂ・・・サーボピストンの受圧部、１９・・・
レギュレータ、２０・・・パイロット圧受庄部、２１・
・・リンク機構、２３・・・切換弁。FIG. 1 is a speed control circuit diagram of the present invention, and 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... Drive circuit (of the motor), 7... Counter balance valve, return circuit, 9... Hydraulic pump for operation, 10... Pilot valve, 11, 12... (pilot (valve) secondary circuit, 13...Shuttle valve, 1
4... Pipe line on the outlet side (of the shuttle valve), 5... Relief valve, 16... Variable displacement hydraulic pump, 17...
・Pilot hydraulic power source, 18...Servo piston, 18
a, 18b... Servo piston pressure receiving part, 19...
Regulator, 20...Pilot pressure receiving part, 21.
...Link mechanism, 23...Switching valve.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] パイロット油圧源からのパイロット圧油によって可変容
量形油圧ポンプを制御するようにしたクレーン等のポン
プ制御回路において、サーボピストンの一方の受圧部に
直接パイロット油圧源からのパイロット圧油を供給し、
サーボピストンの他方の受圧部をレギュレータを介して
パイロット油圧源に接続すると共に、サーボピストンと
レギュレータとを接続する管路にサーボピストンの他方
の受圧部をレギュレータ又は低圧ラインに選択的に切換
接続する切換弁を介装し、かつ予め可変容量形油圧ポン
プの最小吐出量をアクチュエータを微速で操作するため
に必要な量にセットしておき、サーボピストンの他方の
受圧部を低圧ラインに接続した時、油圧ポンプを最小吐
出量に保持するようにしたことを特徴とするクレーン等
のポンプ制御回路。In a pump control circuit for a crane or the like that controls a variable displacement hydraulic pump using pilot pressure oil from a pilot oil pressure source, the pilot pressure oil from the pilot oil pressure source is directly supplied to one pressure receiving part of the servo piston,
The other pressure receiving part of the servo piston is connected to a pilot hydraulic pressure source via a regulator, and the other pressure receiving part of the servo piston is selectively connected to the regulator or a low pressure line to a conduit connecting the servo piston and the regulator. When a switching valve is installed, the minimum discharge amount of the variable displacement hydraulic pump is set in advance to the amount required to operate the actuator at slow speed, and the other pressure receiving part of the servo piston is connected to the low pressure line. A pump control circuit for a crane, etc., characterized in that a hydraulic pump is maintained at a minimum discharge amount.
JP10446584U 1984-07-12 1984-07-12 Pump control circuit for cranes, etc. Pending JPS6120901U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10446584U JPS6120901U (en) 1984-07-12 1984-07-12 Pump control circuit for cranes, etc.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10446584U JPS6120901U (en) 1984-07-12 1984-07-12 Pump control circuit for cranes, etc.

Publications (1)

Publication Number Publication Date
JPS6120901U true JPS6120901U (en) 1986-02-06

Family

ID=30663814

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10446584U Pending JPS6120901U (en) 1984-07-12 1984-07-12 Pump control circuit for cranes, etc.

Country Status (1)

Country Link
JP (1) JPS6120901U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02125032A (en) * 1988-10-31 1990-05-14 Komatsu Ltd Minimum discharge control method for hydraulic pump and device therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5628302A (en) * 1979-08-17 1981-03-19 Hitachi Constr Mach Co Ltd Speed control circuit of crane or the like
JPS5633385A (en) * 1979-08-27 1981-04-03 Hitachi Construction Machinery Control circuit for speed of crane* etc*
JPS5659003A (en) * 1979-10-22 1981-05-22 Kawasaki Heavy Ind Ltd Oil pressure controller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5628302A (en) * 1979-08-17 1981-03-19 Hitachi Constr Mach Co Ltd Speed control circuit of crane or the like
JPS5633385A (en) * 1979-08-27 1981-04-03 Hitachi Construction Machinery Control circuit for speed of crane* etc*
JPS5659003A (en) * 1979-10-22 1981-05-22 Kawasaki Heavy Ind Ltd Oil pressure controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02125032A (en) * 1988-10-31 1990-05-14 Komatsu Ltd Minimum discharge control method for hydraulic pump and device therefor

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