JPS54138265A - Method of and apparatus for controlling operation of constant-output hydraulic hoist - Google Patents

Method of and apparatus for controlling operation of constant-output hydraulic hoist

Info

Publication number
JPS54138265A
JPS54138265A JP4538578A JP4538578A JPS54138265A JP S54138265 A JPS54138265 A JP S54138265A JP 4538578 A JP4538578 A JP 4538578A JP 4538578 A JP4538578 A JP 4538578A JP S54138265 A JPS54138265 A JP S54138265A
Authority
JP
Japan
Prior art keywords
motor
constant
pressure
circuit
pump
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
JP4538578A
Other languages
Japanese (ja)
Other versions
JPS6153318B2 (en
Inventor
Hiromi Go
Kenjiro Kasai
Saburo Kanai
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 Ltd
Original Assignee
Hitachi 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 Ltd filed Critical Hitachi Ltd
Priority to JP4538578A priority Critical patent/JPS54138265A/en
Publication of JPS54138265A publication Critical patent/JPS54138265A/en
Publication of JPS6153318B2 publication Critical patent/JPS6153318B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To improve stability of control circuit, by detecting pressure and acceleration speed as deviation operated signal for controlling the swash plate angle of motor, and controlling the swash plate angle of motor in proportion to the integral value of effective pressure difference and deviation to a desired value.
CONSTITUTION: Load is wound upward by operating variable displacement pump 11 driven by AC motor 10 and supplying pressure oil to variable displacement motor 12. Brake valve 13 is connected to a relief valve at the high pressure side of the circuit and to the outlet port of booster pump 14 for augmenting the oil loss in a closed circuit. Variable displacement motor 12 is provided with regulator 15 for changing the swash plate angle so as to control pressure difference in the circuit. Maximum oil discharging rate of pump 14 is constant independently for the load since supply output of pump is proportional to the product of pressure P and oil discharging rate QP and rotational speed of AC motor 10 is constant. Therefore, if displacement of motor Dm is controlled to keep pressure P constant independently of load, a constant-output hydraulic circuit equivalent to the Ward Leonard system.
COPYRIGHT: (C)1979,JPO&Japio
JP4538578A 1978-04-19 1978-04-19 Method of and apparatus for controlling operation of constant-output hydraulic hoist Granted JPS54138265A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4538578A JPS54138265A (en) 1978-04-19 1978-04-19 Method of and apparatus for controlling operation of constant-output hydraulic hoist

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4538578A JPS54138265A (en) 1978-04-19 1978-04-19 Method of and apparatus for controlling operation of constant-output hydraulic hoist

Publications (2)

Publication Number Publication Date
JPS54138265A true JPS54138265A (en) 1979-10-26
JPS6153318B2 JPS6153318B2 (en) 1986-11-17

Family

ID=12717790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4538578A Granted JPS54138265A (en) 1978-04-19 1978-04-19 Method of and apparatus for controlling operation of constant-output hydraulic hoist

Country Status (1)

Country Link
JP (1) JPS54138265A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033239A2 (en) * 1980-01-25 1981-08-05 Aquila Steel Company Limited Crane hydraulic control system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63194120U (en) * 1987-06-03 1988-12-14
JPH0437058Y2 (en) * 1987-06-03 1992-09-01
JPS63194121U (en) * 1987-06-03 1988-12-14
JPH0528184Y2 (en) * 1987-11-24 1993-07-20
JPH0343421U (en) * 1989-09-08 1991-04-23
EP0819646A4 (en) * 1995-03-10 2000-01-05 Komatsu Mfg Co Ltd Method and system for controlling the speed of a winch
CN105570215B (en) * 2016-03-17 2017-07-28 上海振华重工(集团)股份有限公司 A kind of identical tension hydraulic valve bank

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033239A2 (en) * 1980-01-25 1981-08-05 Aquila Steel Company Limited Crane hydraulic control system

Also Published As

Publication number Publication date
JPS6153318B2 (en) 1986-11-17

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