JPS592771U - Speed control circuit for cranes, etc. - Google Patents

Speed control circuit for cranes, etc.

Info

Publication number
JPS592771U
JPS592771U JP6075083U JP6075083U JPS592771U JP S592771 U JPS592771 U JP S592771U JP 6075083 U JP6075083 U JP 6075083U JP 6075083 U JP6075083 U JP 6075083U JP S592771 U JPS592771 U JP S592771U
Authority
JP
Japan
Prior art keywords
speed control
valve
hydraulic pump
controls
pilot valve
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
Application number
JP6075083U
Other languages
Japanese (ja)
Other versions
JPS6128081Y2 (en
Inventor
徹 内野
Original Assignee
日立建機株式会社
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 日立建機株式会社 filed Critical 日立建機株式会社
Priority to JP6075083U priority Critical patent/JPS592771U/en
Publication of JPS592771U publication Critical patent/JPS592771U/en
Application granted granted Critical
Publication of JPS6128081Y2 publication Critical patent/JPS6128081Y2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control And Safety Of Cranes (AREA)
  • Fluid-Pressure Circuits (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図は従来の速度側御回路図、第２図は本考案の速度
制御回路図、第３図および第４図は本考案に係る流量制
御線図である。 １・・・可変容量膨油圧ポンプ、１ａ・・・制御部、２
・・・方向切換弁、９・・・操作用油圧ポンプ、１ｏ・
・・パイロット弁、１０ａ・・・操作レバー、１１，１
２゜１４・・・管路、１３・・・シャトル弁、１５・・
・減圧弁、１７・・・分岐管路、１９・・・ストップバ
ルブ。 頃 ２０ ゛１１ゴーＩＥζ専ド上ｉ７Ｌコノ ２にFIG. 1 is a conventional speed control circuit diagram, FIG. 2 is a speed control circuit diagram of the present invention, and FIGS. 3 and 4 are flow rate control diagrams according to the present invention. 1... Variable displacement expansion hydraulic pump, 1a... Control section, 2
...Directional switching valve, 9...Hydraulic pump for operation, 1o.
...Pilot valve, 10a...Operation lever, 11,1
2゜14...Pipe line, 13...Shuttle valve, 15...
・Pressure reducing valve, 17...branch pipe, 19...stop valve. Around 20 ゛11 Go IEζ dedicated top i7L Kono 2

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 操作用油圧ポンプの吐出油を切換制御するパイロット弁
を有し、そのパイロット弁の２次圧力によって可変容量
膨油圧ポンプの吐出油を制御すると共に、その吐出油を
切換制御する方向切換弁を前記パイロット弁の操作に応
じて作動するように構成し、たクレーン等の速度制御回
路において、パイロット弁の２次圧力を可変容量膨油圧
ポンプの制御部へ導く管路の途中に減圧弁を設けると共
に、該減圧弁と並列にストップバルブを有する分岐管路
を設け、前記ストップバルブの開閉により中高−速制御
と微低速制御とを選択的に行なうようにしたことを特徴
とするクレーン等の速度制御回路。It has a pilot valve that switches and controls the discharge oil of the operating hydraulic pump, and controls the discharge oil of the variable capacity expansion hydraulic pump by the secondary pressure of the pilot valve, and also includes a directional switching valve that switches and controls the discharge oil. In the speed control circuit of a crane, etc., which is configured to operate in response to the operation of a pilot valve, a pressure reducing valve is provided in the middle of a pipeline that leads the secondary pressure of the pilot valve to the control section of a variable displacement expansion hydraulic pump. A speed control for a crane, etc., characterized in that a branch pipe having a stop valve is provided in parallel with the pressure reducing valve, and medium-high speed control and very low speed control are selectively performed by opening and closing the stop valve. circuit.
JP6075083U 1983-04-25 1983-04-25 Speed control circuit for cranes, etc. Granted JPS592771U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6075083U JPS592771U (en) 1983-04-25 1983-04-25 Speed control circuit for cranes, etc.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6075083U JPS592771U (en) 1983-04-25 1983-04-25 Speed control circuit for cranes, etc.

Publications (2)

Publication Number Publication Date
JPS592771U true JPS592771U (en) 1984-01-09
JPS6128081Y2 JPS6128081Y2 (en) 1986-08-21

Family

ID=30190982

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6075083U Granted JPS592771U (en) 1983-04-25 1983-04-25 Speed control circuit for cranes, etc.

Country Status (1)

Country Link
JP (1) JPS592771U (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116876A (en) * 1974-02-27 1975-09-12
JPS5422691U (en) * 1977-07-19 1979-02-14

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5422691B2 (en) * 1972-07-04 1979-08-08

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116876A (en) * 1974-02-27 1975-09-12
JPS5422691U (en) * 1977-07-19 1979-02-14

Also Published As

Publication number Publication date
JPS6128081Y2 (en) 1986-08-21

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