EP0192750B1 - Hydraulic rotates system for swing crane - Google Patents

Hydraulic rotates system for swing crane Download PDF

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Publication number
EP0192750B1
EP0192750B1 EP19850904609 EP85904609A EP0192750B1 EP 0192750 B1 EP0192750 B1 EP 0192750B1 EP 19850904609 EP19850904609 EP 19850904609 EP 85904609 A EP85904609 A EP 85904609A EP 0192750 B1 EP0192750 B1 EP 0192750B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
pass
crane
motor
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.)
Expired
Application number
EP19850904609
Other languages
German (de)
French (fr)
Other versions
EP0192750A1 (en
Inventor
Fridtjof Berg Kroll
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0192750A1 publication Critical patent/EP0192750A1/en
Application granted granted Critical
Publication of EP0192750B1 publication Critical patent/EP0192750B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/84—Slewing gear
    • B66C23/86—Slewing gear hydraulically actuated

Definitions

  • the present invention concerns a hydraulic rotational drive system for a swing-crane, comprising a hydraulic circuit between a hydraulic pump and a hydraulic motor, a by-pass by-passing said motor, and valve means for opening said by-pass, to allow the crane to rotate according to the wind and for closing said by-pass.
  • a system of this kind is known from US patent specification no 4 013 174 and is adapted for normal swing drive operations by allowing respective functions for start, stop and for unimpeded rotation according to the wind.
  • throttling means having a throttling passage
  • the valve means are selectively operable to close the by-pass thus ensuring a brake function when the oil supply from the hydraulic pump is interrupted, and to open the by-pass to provide a reduced start function when the supply is applied to the motor.
  • said throttling means can allow the boom of the swing crane to rotate freely but nevertheless with a controlled speed away from the wind when the crane is left in an inoperative condition.
  • the system comprises a hydraulic rotary motor A, which is provided with inlet-outlet-ports 1,2 for hydraulic oil.
  • said motor serves as a drive and control aggregate for the rotating movements of a swing crane.
  • said ports 1 and 2 are connected with a hydraulic circuit 3,4, which extends from inlet-outlet-ports 5,6 of a steering valve marked D provided in the line from a hydraulic pump.
  • said hydraulic circuit 3,4 comprises a by-pass 7 which provides a short-circuit between the branches 3 and 4 of said medium circuit, thus by-passing said motor A.
  • Said by-pass 7 comprises a shunt valve C, which is adapted to be kept in an open or in a closed position, and a throttling device B with a passage 8.
  • said throttling device B will, when the shunt valve C is in open position, serves as a hydraulic damping means, which "borrows" its operative oil from the ordinary hydraulic circuit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Hydraulic rotate system for swing crane, which essentially is constructed with hydraulic motor (A), blend (B), two-ways valve (C) and steering valve (D). Blend (B) releases oil through, when the circuit supply of the crane is interrupted and allows thereby automatic the boom of the crane to place itself in the direction of the wind. By normal operation the shunt effect of blend (B) can if desired be eliminated through the valve (C), which is steered from the manoeuvring organ in case standstill braking is wanted by stop or powerful start of the rotate movement.

Description

  • The present invention concerns a hydraulic rotational drive system for a swing-crane, comprising a hydraulic circuit between a hydraulic pump and a hydraulic motor, a by-pass by-passing said motor, and valve means for opening said by-pass, to allow the crane to rotate according to the wind and for closing said by-pass.
  • A system of this kind is known from US patent specification no 4 013 174 and is adapted for normal swing drive operations by allowing respective functions for start, stop and for unimpeded rotation according to the wind.
  • According to the invention, throttling means having a throttling passage, are incorporated in said by-pass and the valve means are selectively operable to close the by-pass thus ensuring a brake function when the oil supply from the hydraulic pump is interrupted, and to open the by-pass to provide a reduced start function when the supply is applied to the motor.
  • In this way, a pressure difference across the motor can be achieved which allows a reduced start of a rotation movement. Additionally, said throttling means can allow the boom of the swing crane to rotate freely but nevertheless with a controlled speed away from the wind when the crane is left in an inoperative condition.
  • A preferred embodiment of the hydraulic system according to the invention is schematically shown in the drawing.
  • The system comprises a hydraulic rotary motor A, which is provided with inlet-outlet-ports 1,2 for hydraulic oil. In the present example said motor serves as a drive and control aggregate for the rotating movements of a swing crane. To this end, said ports 1 and 2 are connected with a hydraulic circuit 3,4, which extends from inlet-outlet-ports 5,6 of a steering valve marked D provided in the line from a hydraulic pump.
  • Moreover, said hydraulic circuit 3,4 comprises a by-pass 7 which provides a short-circuit between the branches 3 and 4 of said medium circuit, thus by-passing said motor A. Said by-pass 7 comprises a shunt valve C, which is adapted to be kept in an open or in a closed position, and a throttling device B with a passage 8.
  • Depending on the position of the shunt valve C, either all hydraulic oil will be circulated from the pump through the open steering valve D to the motor A, when said shunt valve is closed, or part of said supply will by-pass said motor, when the shunt valve C is opened.
  • Thus, said throttling device B will, when the shunt valve C is in open position, serves as a hydraulic damping means, which "borrows" its operative oil from the ordinary hydraulic circuit.

Claims (1)

  1. Hydraulic rotational drive system for a swing-crane, comprising a hydraulic circuit between a hydraulic pump (D) and a hydraulic motor (A), a by-pass (7) by-passing said motor (A) and valve means (C) for opening said by-pass, to allow the crane to rotate according to the wind and for closing said by-pass, characterized in that throttling means (B) having a throttling passage (8) are incorporated in said by-pass (7) and that the valve means (C) are selectively operable to close the by-pass thus ensuring a brake function when the oil supply from the hydraulic pump (D) is interrupted and to open the by-pass to provide a reduced start function when the supply is applied to the motor (A).
EP19850904609 1984-09-06 1985-09-06 Hydraulic rotates system for swing crane Expired EP0192750B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK4249/84 1984-09-06
DK424984A DK151102C (en) 1984-09-06 1984-09-06 HYDRAULIC CROWD DRIVE

Publications (2)

Publication Number Publication Date
EP0192750A1 EP0192750A1 (en) 1986-09-03
EP0192750B1 true EP0192750B1 (en) 1992-12-02

Family

ID=8131737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850904609 Expired EP0192750B1 (en) 1984-09-06 1985-09-06 Hydraulic rotates system for swing crane

Country Status (12)

Country Link
EP (1) EP0192750B1 (en)
JP (1) JPS62500376A (en)
AT (1) ATA902885A (en)
CH (1) CH669183A5 (en)
DE (1) DE3590423T1 (en)
DK (1) DK151102C (en)
FI (1) FI861871A0 (en)
GB (1) GB2177675B (en)
NL (1) NL8520291A (en)
NO (1) NO861761L (en)
SE (1) SE465266B (en)
WO (1) WO1986001494A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE508992C2 (en) * 1991-05-22 1998-11-23 Einar Karlsson Device for damping oscillations in a hydraulic load crane
DE102017117505B4 (en) * 2017-08-02 2020-10-22 Manitowoc Crane Group France Sas Closed hydraulic circuit crane
CN109469666A (en) * 2018-10-17 2019-03-15 江苏谷登工程机械装备有限公司 A kind of horizontal directional drilling machine hydraulic control system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT301802B (en) * 1970-04-21 1972-09-25 Hans Kuenz Fa Trolley for crane systems
US4013174A (en) * 1974-11-11 1977-03-22 The Manitowoc Company, Inc. Swing drive with automatic shut-down control

Also Published As

Publication number Publication date
DE3590423T1 (en) 1986-10-09
DK151102B (en) 1987-11-02
GB2177675A (en) 1987-01-28
GB8610936D0 (en) 1986-06-11
JPS62500376A (en) 1987-02-19
ATA902885A (en) 1993-08-15
DK424984D0 (en) 1984-09-06
EP0192750A1 (en) 1986-09-03
SE8602046L (en) 1986-05-05
SE465266B (en) 1991-08-19
SE8602046D0 (en) 1986-05-05
FI861871A (en) 1986-05-05
GB2177675B (en) 1988-05-18
FI861871A0 (en) 1986-05-05
NO861761L (en) 1986-05-02
WO1986001494A1 (en) 1986-03-13
DK424984A (en) 1986-03-07
CH669183A5 (en) 1989-02-28
DK151102C (en) 1988-03-21
NL8520291A (en) 1986-08-01

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