JPS6182101U - - Google Patents

Info

Publication number
JPS6182101U
JPS6182101U JP16753784U JP16753784U JPS6182101U JP S6182101 U JPS6182101 U JP S6182101U JP 16753784 U JP16753784 U JP 16753784U JP 16753784 U JP16753784 U JP 16753784U JP S6182101 U JPS6182101 U JP S6182101U
Authority
JP
Japan
Prior art keywords
port
valve
directional control
pilot
control 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
JP16753784U
Other languages
Japanese (ja)
Other versions
JPH0320562Y2 (en
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 filed Critical
Priority to JP1984167537U priority Critical patent/JPH0320562Y2/ja
Publication of JPS6182101U publication Critical patent/JPS6182101U/ja
Application granted granted Critical
Publication of JPH0320562Y2 publication Critical patent/JPH0320562Y2/ja
Expired legal-status Critical Current

Links

Landscapes

  • Forklifts And Lifting Vehicles (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の構成を示した液圧回路図、第
２図は本考案の実施例を示した回路説明図、第３
図は従来の液圧回路図である。 １：液圧シリンダ、２：負荷、４：パイロツト
チエツク弁、９：双方向圧力補償弁、１０：方向
制御弁、Ｐ：ポンプポート、Ｔ：タンクポート、
Ｃ１，Ｃ２：負荷接続ポート、Ｐ：第１のパイロ
ツトポート、Ｐ：第２のパイロツトポート。 Fig. 1 is a hydraulic circuit diagram showing the configuration of the present invention, Fig. 2 is an explanatory circuit diagram showing an embodiment of the invention, and Fig. 3 is a hydraulic circuit diagram showing the configuration of the present invention.
The figure is a conventional hydraulic circuit diagram. 1: Hydraulic cylinder, 2: Load, 4: Pilot check valve, 9: Bidirectional pressure compensation valve, 10: Directional control valve, P: Pump port, T: Tank port,
C1, C2: load connection ports, P: first pilot port, P: second pilot port.

Claims (1)

【実用新案登録請求の範囲】 主ラインの液圧切換により負荷を昇降駆動する
液圧シリンダと、 中立、上昇及び下降の各切換位置に応じてポン
プポート及びタンクポートと前記液圧シリンダに
対する負荷接続ポートとの間を切換制御する方向
制御弁と、 前記液圧シリンダと方向制御弁との間の一方の
液圧系統に設けられ液圧シリンダからの戻りライ
ン圧力を受けて閉鎖すると共にパイロツト圧力の
供給で開放するパイロツトチエツク弁と、 該パイロツトチエツク弁に直列接続されると共
に前記方向制御弁の前後差圧をセンシング圧力と
して入力し、前記方向制御弁の上昇または下降切
換位置においてその前後差圧を一定に保つように
作動する双方向圧力補償弁とを備え、 更に前記方向制御弁に、上昇位置への切換直前
からポンプポートを前記双方向圧力補償弁の一方
のセンシングポートに連通すると共に下降位置へ
の切換で前記センシングポートをタンクポートに
連通する第１のパイロツトポートと、上昇位置へ
の切換で前記パイロツトチエツク弁のパイロツト
ポートをタンクポートに連通すると共に下降位置
への切換直前からポンプポートを前記パイロツト
チエツク弁のパイロツトポートに連通する第２の
パイロツトポートを設けたことを特徴とする昇降
装置の液圧回路。[Scope of claim for utility model registration] A hydraulic cylinder that drives the load up and down by switching the hydraulic pressure of the main line, and a load connection to the hydraulic cylinder with a pump port and a tank port according to each switching position of neutral, up, and down. a directional control valve that controls switching between the hydraulic cylinder and the directional control valve; and a directional control valve that is provided in one of the hydraulic systems between the hydraulic cylinder and the directional control valve and that closes in response to return line pressure from the hydraulic cylinder and also controls pilot pressure. A pilot check valve that opens upon supply, and a pilot check valve that is connected in series to the pilot check valve and inputs the differential pressure across the directional control valve as a sensing pressure, and detects the differential pressure across the directional control valve at the ascending or descending switching position. a two-way pressure compensation valve that operates to maintain a constant pressure; and the directional control valve is further provided with a pump port connected to one sensing port of the two-way pressure compensation valve immediately before switching to the up position, and the pump port is connected to one of the sensing ports of the two-way pressure compensation valve when the directional control valve is switched to the down position. The first pilot port connects the sensing port to the tank port when the valve is switched to the upper position, and the pilot port of the pilot check valve is connected to the tank port when the valve is switched to the upper position, and the pump port is opened immediately before switching to the lower position. A hydraulic circuit for a lifting device, characterized in that a second pilot port is provided which communicates with the pilot port of the pilot check valve.
JP1984167537U 1984-11-05 1984-11-05 Expired JPH0320562Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1984167537U JPH0320562Y2 (en) 1984-11-05 1984-11-05

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1984167537U JPH0320562Y2 (en) 1984-11-05 1984-11-05

Publications (2)

Publication Number Publication Date
JPS6182101U true JPS6182101U (en) 1986-05-31
JPH0320562Y2 JPH0320562Y2 (en) 1991-05-02

Family

ID=30725330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1984167537U Expired JPH0320562Y2 (en) 1984-11-05 1984-11-05

Country Status (1)

Country Link
JP (1) JPH0320562Y2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012136318A (en) * 2010-12-27 2012-07-19 Onodani Kiko Kk Portable-type simplified jack for vehicle
JP2015059034A (en) * 2013-09-20 2015-03-30 ニチユ三菱フォークリフト株式会社 Hydraulic system and forklift with the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5067428U (en) * 1973-10-20 1975-06-17
JPS5414875U (en) * 1977-07-01 1979-01-31
JPS58106272A (en) * 1981-12-16 1983-06-24 Uchida Yuatsu Kiki Kogyo Kk Flux control valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5067428U (en) * 1973-10-20 1975-06-17
JPS5414875U (en) * 1977-07-01 1979-01-31
JPS58106272A (en) * 1981-12-16 1983-06-24 Uchida Yuatsu Kiki Kogyo Kk Flux control valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012136318A (en) * 2010-12-27 2012-07-19 Onodani Kiko Kk Portable-type simplified jack for vehicle
JP2015059034A (en) * 2013-09-20 2015-03-30 ニチユ三菱フォークリフト株式会社 Hydraulic system and forklift with the same

Also Published As

Publication number Publication date
JPH0320562Y2 (en) 1991-05-02

Similar Documents

Publication Publication Date Title
WO2020006932A1 (en) Bucket leveling system for aerial work truck
JPS6182101U (en)
CN212297072U (en) Energy-saving valve bank for parallel control of header lifting and traveling steering of harvester
JPH0337839Y2 (en)
JPS6182105U (en)
JPS6386404U (en)
JPH0451531Y2 (en)
JPH01111694U (en)
JPH01126398U (en)
JPH0478306U (en)
JPS6420504U (en)
JPH0175604U (en)
JPS62147703U (en)
JPS61183372U (en)
JPH01156247U (en)
JPH01163905U (en)
JPS62133976U (en)
JPH0341211U (en)
JPS6336703U (en)
JPS63139301U (en)
JPS6123506U (en) Hydraulic lifting control device
JPS5869059U (en) Hydraulic power shovel hydraulic control device
JPS644621U (en)
JPS6051301U (en) Lifting device hydraulic circuit
JPS61128296U (en)