EP0557390B1 - Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane - Google Patents

Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane Download PDF

Info

Publication number
EP0557390B1
EP0557390B1 EP91920481A EP91920481A EP0557390B1 EP 0557390 B1 EP0557390 B1 EP 0557390B1 EP 91920481 A EP91920481 A EP 91920481A EP 91920481 A EP91920481 A EP 91920481A EP 0557390 B1 EP0557390 B1 EP 0557390B1
Authority
EP
European Patent Office
Prior art keywords
flow
crane
control
maximum
hydraulic
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.)
Revoked
Application number
EP91920481A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0557390A1 (en
Inventor
Lars Andersson
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.)
Hiab AB
Original Assignee
Hiab AB
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20380929&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0557390(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hiab AB filed Critical Hiab AB
Publication of EP0557390A1 publication Critical patent/EP0557390A1/en
Application granted granted Critical
Publication of EP0557390B1 publication Critical patent/EP0557390B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices

Definitions

  • the present invention relates to a method of preventing puncture in a load-sensing and pressure-compensating control system for a hydraulic crane when the hydraulic flow requested to the different functions of the crane exceeds the maximum hydraulic flow available.
  • the invention further concerns a device for implementing the method.
  • Fig. 1 illustrates a conventional hydraulic crane which includes a body 1, a first boom section 2 articulated to the body 1, an outer boom 3 articulated to the first boom section 2, and an extension boom 4 fixed to the outer boom 3.
  • the first boom section is operated by means of a hydraulic lifting cylinder 5
  • the outer boom 3 is operated by means of a hydraulic outer boom cylinder 6
  • the extension boom 4 is operated by means of a hydraulic extension boom cylinder 7.
  • the control system for controlling the different crane functions comprises a pump 10 which pumps hydraulic fluid from a tank 9 to a directional-control-valve block 12 containing a directional-control-valve section for each of the cylinders 5-7, to which the hydraulic fluid is supplied in conventional manner as a function of the position of the slide member in each valve section.
  • the directional-control-valve sections are remote-controlled by a control means 13 with one lever for each crane function.
  • the signals from the control means 13 are transmitted via a cable or a wireless connection to a microprocessor 16 which in turn controls the position of the slide members in the valve sections of the directional-control-valve block 12 as a function of the value of the respective control signal from the control means.
  • control system In advanced cranes, the control system, or more precisely the directional-control-valve block 12, can be load-sensing and pressure-compensating, which means that a certain lever position on the control means 13 produces a certain flow to the associated crane function, regardless of the load on this function and regardless of the flow to and load on the remaining crane functions.
  • the object of the present invention is, therefore, to provide a method and a device which solve the above-mentioned problem and make it possible to use pumps with lower maximum flow without risking a puncture of the control system.
  • step c) is preferably repeated after the scaling down.
  • the scale factors may then be so chosen that there is only a slight scaling down, since there will be a renewed check on whether the sum is smaller than the maximum-flow value, so that the scaling down can be repeated if need be.
  • the scale factors can be the same for all the functions or, as recited in appended claim 3, be different for different crane functions, so that certain functions may be prioritised.
  • the invention also concerns a device for implementing the method, which shows the features recited in appended claim 5.
  • the invention can be applied to hydraulic cranes with load-sensing and pressure-compensating control systems.
  • the crane functions of such a crane may, for instance, include lifting/lowering the first boom section, tilting the outer boom, extending/retracting the extension boom, lifting/lowering the jib boom, and rotating the crane.
  • the control signals from the control means are processed in the following manner (see the flow chart in Fig. 2).
  • a first step 20 is measured the value of each of the control signals Q1-Q N representing a flow requested to a crane function and being transmitted from the control means 13 to the microprocessor 16.
  • the thus-established values of the control signals Q1-Q N are added up, which gives the sum Q p .
  • the sum Q p is, in step 22, compared with a maximum-flow value Q max representing the maximum hydraulic flow available from the pump.
  • control signals are, in step 25, transmitted as they are to the respective directional-control-valve section in the directional-control-valve block 12. This program is repeated at suitable intervals, thereby avoiding a puncture of the system.
  • control-signal value need not be measured directly after the control means 13, but may instead be measured by establishing the displacement of the slide member in the valve 12 caused by the signal.
  • the thus-established values are returned to the microprocessor 16, whereupon the method is implemented in the manner described above.
  • This variant may be used not only in remote-controlled systems, but also in hand-lever-controlled, load-sensing and pressure-compensating valves.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Control And Safety Of Cranes (AREA)
  • Jib Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)
EP91920481A 1990-11-16 1991-11-14 Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane Revoked EP0557390B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9003656A SE467408B (sv) 1990-11-16 1990-11-16 Saett och anordning foer foerhindrande av punktering av ett lastkaennande och tryckkompenserande styrsystem foer en hydraulisk kran
SE9003656 1990-11-16
PCT/SE1991/000773 WO1992008666A1 (en) 1990-11-16 1991-11-14 Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane

Publications (2)

Publication Number Publication Date
EP0557390A1 EP0557390A1 (en) 1993-09-01
EP0557390B1 true EP0557390B1 (en) 1995-02-15

Family

ID=20380929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91920481A Revoked EP0557390B1 (en) 1990-11-16 1991-11-14 Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane

Country Status (7)

Country Link
EP (1) EP0557390B1 (ja)
JP (1) JPH06504512A (ja)
AT (1) ATE118459T1 (ja)
DE (1) DE69107472T2 (ja)
ES (1) ES2068612T3 (ja)
SE (1) SE467408B (ja)
WO (1) WO1992008666A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0779239B2 (de) * 1995-12-13 2006-09-13 Liebherr-Werk Ehingen GmbH Steuervorrichtung für ein Hubwerk eines Krans
DK1490288T3 (en) * 2001-11-28 2015-05-11 Hojbjerg Maskinfabrik As Load control system, preferably for boom cranes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3638211A (en) * 1969-10-08 1972-01-25 Litton Systems Inc Crane safety system
US4222491A (en) * 1978-08-02 1980-09-16 Eaton Corporation Crane operating aid and sensor arrangement therefor
FR2504701A1 (fr) * 1981-04-22 1982-10-29 Camiva Dispositif de commande de correction automatique de devers pour echelle orientable deployable ou bras elevateur analogue sur vehicule
DE3605462A1 (de) * 1986-02-24 1987-08-27 Mo N Proizv Ob Str Dorozh Mash Verfahren zur sicherung eines gefahrlosen betriebes von selbstfahrenden auslegerkranen und system zur durchfuehrung desselben

Also Published As

Publication number Publication date
SE9003656D0 (sv) 1990-11-16
ATE118459T1 (de) 1995-03-15
SE467408B (sv) 1992-07-13
EP0557390A1 (en) 1993-09-01
DE69107472T2 (de) 1995-06-14
WO1992008666A1 (en) 1992-05-29
SE9003656L (sv) 1992-05-17
ES2068612T3 (es) 1995-04-16
DE69107472D1 (de) 1995-03-23
JPH06504512A (ja) 1994-05-26

Similar Documents

Publication Publication Date Title
US7276669B2 (en) Payload overload control system
US6983592B2 (en) Mobile working machine
CA2060344C (en) Control device for work machine
EP3257805A1 (en) Hydraulic crane
JP4468703B2 (ja) 機械を制御する装置および方法
EP0731054A1 (en) Mobile reach tower crane
JPH04303395A (ja) フォークリフトの制御装置
EP3239092B1 (en) Hydraulic crane
US6915599B2 (en) System for controlling movement of a work machine arm
EP0557390B1 (en) Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane
US9334883B2 (en) Method for controlling a hydraulic system of a working machine
SE1551349A1 (en) Adaptive control of hydraulic tool on remote demolition robot
EP0397076A1 (en) Electrohydraulic system
JPH01256496A (ja) ブームを有するクレーンの吊荷地切時荷振防止装置
US6459976B1 (en) Method and system for controlling steady-state speed of hydraulic cylinders in an electrohydraulic system
RU2343104C2 (ru) Система управления грузоподъемного крана (варианты)
EP4201865A1 (en) A working equipment system, and a method of the working equipment system
JPH01256497A (ja) 伸縮ブームを有するクレーンの吊荷地切時荷振防止装置
US20090220350A1 (en) Method and apparatus for controlling a hydraulic system of a work machine
JP2986510B2 (ja) 旋回制御装置
JP3323734B2 (ja) 作業機の旋回制御装置
JPH0440009Y2 (ja)
JP2000355497A (ja) フォークリフトトラックの荷役用シリンダの制御装置
EP1798188A2 (en) Hydraulic crane
JPS60252805A (ja) 流体アクチユエ−タの制御方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930513

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

RBV Designated contracting states (corrected)

Designated state(s): AT DE ES FR GB IT NL

17Q First examination report despatched

Effective date: 19940606

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE ES FR GB IT NL

REF Corresponds to:

Ref document number: 118459

Country of ref document: AT

Date of ref document: 19950315

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: BUGNION S.P.A.

REF Corresponds to:

Ref document number: 69107472

Country of ref document: DE

Date of ref document: 19950323

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2068612

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19951019

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19951106

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19951107

Year of fee payment: 5

Ref country code: AT

Payment date: 19951107

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19951113

Year of fee payment: 5

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19951130

Year of fee payment: 5

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

26 Opposition filed

Opponent name: MANNESMANN REXROTH GMBH

Effective date: 19951110

NLR1 Nl: opposition has been filed with the epo

Opponent name: MANNESMANN REXROTH GMBH

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

RDAH Patent revoked

Free format text: ORIGINAL CODE: EPIDOS REVO

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state

Free format text: 961017

27W Patent revoked

Effective date: 19961017

NLR2 Nl: decision of opposition