JPS5628302A - Speed control circuit of crane or the like - Google Patents

Speed control circuit of crane or the like

Info

Publication number
JPS5628302A
JPS5628302A JP10402779A JP10402779A JPS5628302A JP S5628302 A JPS5628302 A JP S5628302A JP 10402779 A JP10402779 A JP 10402779A JP 10402779 A JP10402779 A JP 10402779A JP S5628302 A JPS5628302 A JP S5628302A
Authority
JP
Japan
Prior art keywords
pressure
valve
piping
speed control
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.)
Granted
Application number
JP10402779A
Other languages
Japanese (ja)
Other versions
JPS595163B2 (en
Inventor
Toru Uchino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP10402779A priority Critical patent/JPS595163B2/en
Publication of JPS5628302A publication Critical patent/JPS5628302A/en
Publication of JPS595163B2 publication Critical patent/JPS595163B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Control And Safety Of Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE: To make a stationary extremely low speed control possible, by arranging a change-over valve in a piping for leading a secondary pressure of a pilot valve, which is switched and controls the discharge of oil of a hydraulic pump for operating a crane, into a control part of a variable volume type hydraulic pump.
CONSTITUTION: When an operating lever 10a of a pilot valve 10 is moved in a direction shown by the arrow, an oil pressure is developed in a secondary side piping 11 according to its degree of operation, and the oil pressure is conducted through a shuttle valve 13 into a control part 1a of a variable volume type hydraulic pump 1 to control the discharge flow amount of the pump 1. Also the pressure oil developed in the piping 11 is conducted to a pressure receiving part 2a to switch a direction cheange-over valve 2 to rotate a hydraulic motor 4 in a direction shown by the arrow. In this speed control circuit, a change-over valve 15 is provided in an intermediate of a piping 14 that leads the secondary pressure of the pilot valve 10 into the control part 1a. When the change-over valve 15 is switched to an interception side, a secondary side piping 17 of a pressure control valve 16 is communicated with the control part 1a, so that the extremely low speed control becomes possible.
COPYRIGHT: (C)1981,JPO&Japio
JP10402779A 1979-08-17 1979-08-17 Speed control circuit for cranes, etc. Expired JPS595163B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10402779A JPS595163B2 (en) 1979-08-17 1979-08-17 Speed control circuit for cranes, etc.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10402779A JPS595163B2 (en) 1979-08-17 1979-08-17 Speed control circuit for cranes, etc.

Publications (2)

Publication Number Publication Date
JPS5628302A true JPS5628302A (en) 1981-03-19
JPS595163B2 JPS595163B2 (en) 1984-02-03

Family

ID=14369759

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10402779A Expired JPS595163B2 (en) 1979-08-17 1979-08-17 Speed control circuit for cranes, etc.

Country Status (1)

Country Link
JP (1) JPS595163B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5886902U (en) * 1981-12-07 1983-06-13 株式会社クボタ Drive device for fluid pressure cylinder
JPS6120901U (en) * 1984-07-12 1986-02-06 住友重機械工業株式会社 Pump control circuit for cranes, etc.
JPS6120902U (en) * 1984-07-12 1986-02-06 住友重機械工業株式会社 Pump control circuit for cranes, etc.
JPH06129405A (en) * 1993-02-18 1994-05-10 Yutani Heavy Ind Ltd Variable method for actuator relative speed
CN102192204A (en) * 2011-03-29 2011-09-21 宋建安 Hydraulic speed control system
CN102674157A (en) * 2012-05-22 2012-09-19 徐州重型机械有限公司 Low-speed rotary control method and system for cranes
CN104071709A (en) * 2014-07-18 2014-10-01 徐州重型机械有限公司 Fixed fly jib stepless amplitude-variation control system for crane and crane

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5886902U (en) * 1981-12-07 1983-06-13 株式会社クボタ Drive device for fluid pressure cylinder
JPS6120901U (en) * 1984-07-12 1986-02-06 住友重機械工業株式会社 Pump control circuit for cranes, etc.
JPS6120902U (en) * 1984-07-12 1986-02-06 住友重機械工業株式会社 Pump control circuit for cranes, etc.
JPH06129405A (en) * 1993-02-18 1994-05-10 Yutani Heavy Ind Ltd Variable method for actuator relative speed
CN102192204A (en) * 2011-03-29 2011-09-21 宋建安 Hydraulic speed control system
CN102674157A (en) * 2012-05-22 2012-09-19 徐州重型机械有限公司 Low-speed rotary control method and system for cranes
CN104071709A (en) * 2014-07-18 2014-10-01 徐州重型机械有限公司 Fixed fly jib stepless amplitude-variation control system for crane and crane

Also Published As

Publication number Publication date
JPS595163B2 (en) 1984-02-03

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