EP0055247A2 - Grue de chargement - Google Patents

Grue de chargement Download PDF

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Publication number
EP0055247A2
EP0055247A2 EP81890209A EP81890209A EP0055247A2 EP 0055247 A2 EP0055247 A2 EP 0055247A2 EP 81890209 A EP81890209 A EP 81890209A EP 81890209 A EP81890209 A EP 81890209A EP 0055247 A2 EP0055247 A2 EP 0055247A2
Authority
EP
European Patent Office
Prior art keywords
hydraulic drive
swivel arm
valve
overload
lowering
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
EP81890209A
Other languages
German (de)
English (en)
Other versions
EP0055247A3 (en
EP0055247B1 (fr
Inventor
Georg Popodi
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.)
Palfinger AG
Original Assignee
Palfinger AG
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 Palfinger AG filed Critical Palfinger AG
Publication of EP0055247A2 publication Critical patent/EP0055247A2/fr
Publication of EP0055247A3 publication Critical patent/EP0055247A3/de
Application granted granted Critical
Publication of EP0055247B1 publication Critical patent/EP0055247B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with load-holding valves
    • 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
    • B66C23/88—Safety gear
    • B66C23/90—Devices for indicating or limiting lifting moment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure

Definitions

  • the invention relates to a loading crane with a swivel arm which can be raised and lowered by means of a first hydraulic drive and which optionally comprises a plurality of swivel arm parts which can be moved relative to one another by means of further hydraulic drives, a load holding valve being connected upstream of the cylinder space of the first hydraulic drive associated with a lifting movement of the swivel arm which can be controlled into the open position by an increase in pressure in the line connected to the cylinder chamber associated with a lowering movement, and with which an overload valve communicates with the first hydraulic drive, which responds in the event of a crane overload and one or more of the hydraulic drives against a torque increasing the load torque Movement blocks.
  • a loading crane with an overload protection device which is primarily intended for mounting on trucks, is described for example in DE-PS 21 54 631.
  • This loading crane consists of a two-part swivel arm and a telescopic extension arm, whereby all these arms can be moved against each other by means of double-acting hydraulic drives. The movement of the hydraulic drives is initiated by means of control valves.
  • an overload valve communicates with the hydraulic drive that controls the lifting and lowering movement of the swivel arm. This overload valve responds in the event of a crane overload and shifts the control valves into a neutral position or prevents the control valves from being actuated in the direction in which the load torque increases.
  • a major disadvantage with such a loading crane is that no load holding valve can be used.
  • Such a load holding valve is connected upstream of the cylinder space of the corresponding hydraulic drive assigned to a lifting movement of the swivel arm, and is controlled into the open position by pressure increase in the line connected to the cylinder movement assigned to a lowering movement.
  • Advantages of load holding Tiles are, among other things, an absolutely safe hanging of the load and the omission of an otherwise necessary hose rupture valve, which would only mean partial securing of the loading crane.
  • the invention was accordingly based on the object of preventing the overloading of a loading crane of the type mentioned at the outset even when the swivel arm or main arm was lowered.
  • the overload valve blocks at least the first hydraulic drive against a lowering movement of the swivel arm in the event of a crane overload, and that the pressure increase required for a lowering movement of the swivel arm in the corresponding line connected to the first, hydraulic drive in or before the overload valve is compensated.
  • the switching threshold of the overload valve is maintained or is prevented that this pressure increase is superimposed on the pressure resulting from the load moment. This reliably prevents the load crane from tipping over or being overloaded even when the swivel arm is lowered.
  • FIG. 1 shows the diagram of a loading crane according to the invention with compensation for the pressure increase in the overload valve required for the lowering movement of the swivel arm
  • FIG. 2 shows the compensation by means of a compensation valve upstream of the overload valve
  • FIG. 3 shows the use of a pressure reducing valve for this purpose.
  • the swivel arm 2 is shown of the well-known loading crane 1, which can be raised or lowered by means of a hydraulic drive 3 consisting of a cylinder and piston with a piston rod. It is easy to see that the load torque is reduced or increased by this lifting or lowering movement.
  • the cylinder space 3 ′′ of the hydraulic drive 3 assigned to the lowering movement is connected to a control valve 4 via a lowering line 7.
  • a known load-holding valve 12 is connected upstream of the cylinder space 3 ′ assigned to a lifting movement of the swivel arm 2 and is likewise connected to the control valve 4 via a line 6
  • the cylinder chamber 3 communicates with an overload valve 11 via a line 8.
  • This overload valve is biased into the closed position by means of a spring and has a first control piston which counteracts the spring force and communicates with the line 8 via a line 10.
  • a second control piston whose direction of action is opposite to the first control piston, communicates with the lowering line 7 via a line 13.
  • the overload valve 11 responds in a known manner, ie it connects the line 8 to the line 16 and thus actuates a locking drive 5.
  • This locking drive 5 moves all the control valves 4 into a neutral position, which hydraulic drives are assigned, which can cause a movement that increases the load moment.
  • the locking drive 5 can either be integrated in a known manner in the control valves, but it can also act directly on the hand lever for actuating the control valves.
  • the overload valve 11 blocks the control valve 4 via the blocking drive 5 in the manner previously described.
  • the overload valve 11 is preceded by a pressure compensation valve 14, which in turn has two counteracting control pistons and is resiliently biased into the closed position.
  • the first control piston communicates with the cylinder space 3 ′ of the drive 3 via a line 10
  • the second control piston communicates with the lowering line 7 via a line 13.
  • FIG. 3 Another possibility of pressure compensation when lowering the swivel arm 2 is shown in FIG. 3.
  • a pressure reducing valve 15 is switched into the lowering line 7 between the connection for the control line 9 of the load holding valve 12 and the hydraulic drive 3.
  • This pressure reducing valve 15 prevents the overpressure required for opening the load holding valve from propagating in the lower line 7 into the cylinder space 3 ′′ and thus superimposed on the pressure resulting from the load moment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Jib Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)
EP81890209A 1980-12-23 1981-12-23 Grue de chargement Expired EP0055247B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6280/80 1980-12-23
AT0628080A AT368107B (de) 1980-12-23 1980-12-23 Ladekran

Publications (3)

Publication Number Publication Date
EP0055247A2 true EP0055247A2 (fr) 1982-06-30
EP0055247A3 EP0055247A3 (en) 1984-07-25
EP0055247B1 EP0055247B1 (fr) 1986-09-03

Family

ID=3584717

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81890209A Expired EP0055247B1 (fr) 1980-12-23 1981-12-23 Grue de chargement

Country Status (3)

Country Link
EP (1) EP0055247B1 (fr)
AT (1) AT368107B (fr)
DE (1) DE3175278D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0158740A2 (fr) * 1984-04-14 1985-10-23 Robert Bosch Gmbh Dispositif hydraulique de protection contre les surcharges pour un appareil de levage
EP0158738A2 (fr) * 1984-04-14 1985-10-23 Robert Bosch Gmbh Dispositif hydraulique de protection contre les surcharges pour une grue de chargement
CN106185633A (zh) * 2016-08-24 2016-12-07 三汽车起重机械有限公司 平衡阀装置、起重机及升降机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2154631A1 (de) * 1970-11-04 1972-05-10 Hiab-Foco Ab, Hudiksvall (Schweden) Sperrvorrichtung an hydraulisch betätigbaren Ladekränen
US3814265A (en) * 1973-08-20 1974-06-04 Harnischfeger Corp Hydraulic crane control system having means for deactivating control valves when operating limit is exceeded
US3841493A (en) * 1972-06-05 1974-10-15 J Becker Moment monitoring system for hydraulic-piston type cranes
FR2483904A1 (fr) * 1980-06-04 1981-12-11 Hiab Foco Ab Dispositif limiteur de charge pour grues a commande hydraulique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2154631A1 (de) * 1970-11-04 1972-05-10 Hiab-Foco Ab, Hudiksvall (Schweden) Sperrvorrichtung an hydraulisch betätigbaren Ladekränen
US3841493A (en) * 1972-06-05 1974-10-15 J Becker Moment monitoring system for hydraulic-piston type cranes
US3814265A (en) * 1973-08-20 1974-06-04 Harnischfeger Corp Hydraulic crane control system having means for deactivating control valves when operating limit is exceeded
FR2483904A1 (fr) * 1980-06-04 1981-12-11 Hiab Foco Ab Dispositif limiteur de charge pour grues a commande hydraulique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ÖLHYDRAULIK UND PNEUMATIC, Band 21, Nr. 6, Juni 1977, Mainz (DE) *
ÖLHYDRAULIK UND PNEUMATIC, Band 21, Nr. 6, Juni 1977, Mainz (DE) G. BEITLER: "Steuerung hydraulischer Hebezeuge", Seiten 458-460 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0158740A2 (fr) * 1984-04-14 1985-10-23 Robert Bosch Gmbh Dispositif hydraulique de protection contre les surcharges pour un appareil de levage
EP0158738A2 (fr) * 1984-04-14 1985-10-23 Robert Bosch Gmbh Dispositif hydraulique de protection contre les surcharges pour une grue de chargement
EP0158740A3 (fr) * 1984-04-14 1988-10-19 Robert Bosch Gmbh Dispositif hydraulique de protection contre les surcharges pour un appareil de levage
EP0158738A3 (fr) * 1984-04-14 1988-10-19 Robert Bosch Gmbh Dispositif hydraulique de protection contre les surcharges pour une grue de chargement
CN106185633A (zh) * 2016-08-24 2016-12-07 三汽车起重机械有限公司 平衡阀装置、起重机及升降机构
CN106185633B (zh) * 2016-08-24 2018-02-23 三一汽车起重机械有限公司 平衡阀装置、起重机及升降机构

Also Published As

Publication number Publication date
EP0055247A3 (en) 1984-07-25
AT368107B (de) 1982-09-10
EP0055247B1 (fr) 1986-09-03
ATA628080A (de) 1982-01-15
DE3175278D1 (en) 1986-10-09

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