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WO1993022233A1 - Procede et appareil de transport d'un fluide sous pression vers des verins - Google Patents

Procede et appareil de transport d'un fluide sous pression vers des verins Download PDF

Info

Publication number
WO1993022233A1
WO1993022233A1 PCT/FI1992/000131 FI9200131W WO9322233A1 WO 1993022233 A1 WO1993022233 A1 WO 1993022233A1 FI 9200131 W FI9200131 W FI 9200131W WO 9322233 A1 WO9322233 A1 WO 9322233A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
medium
actuators
actuator
several
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.)
Ceased
Application number
PCT/FI1992/000131
Other languages
English (en)
Inventor
Seppo Ensio Nisula
Ali Markku Juhani Nisula
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 WO1993022233A1 publication Critical patent/WO1993022233A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • 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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/30515—Load holding valves
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Definitions

  • the invention relates to motion-producing machines and de ⁇ vices fitted with several medium driven actuators, such as hydraulic cylinders. According to the invention, discharge of highly pressurized medium, with no operative function, to lower pressure or free space is prevented or diminshed.
  • Previously known as medium driven devices are among others timber cranes, in which two or several tandem coupled arms are moved by means of hydraulic cylinders. Often two or several cylinders are operated simultaneously during the lifting and loading motions. Actually, this means that the pump pressure and the pump deplacement must be sufficient for the simultan ⁇ eous function of two cylinders, at least. Therefore, the crane is furnished with a pump with great capacity and, accordingly, a motor with great output is needed to operate the pump. Further, the cranes have also a number of other devices, which are operated by much smaller deplacements and often used in ⁇ dividually. Such devices are, among others, the slewing gear ring of the swivelling and timber loading grapple.
  • the medium pipes are taken from the valves direct to the cylinders, whereby all cylinders are independent and the returnig mediums discharged from the cylinders over the return line to the pressure fluid tank even though the medium would have much pressure and a great volume of flow. So more or less, pressure energy of the medium is wasted even though it could be utilized at that very moment.
  • the devices must be furnished with a pump with great deplacement and, accordingly, a pump actuator with a great output.
  • Fig. 1 is a crane with a 2-armed boom
  • Fig. 2 is a delivery pipeline assembly for the cylinders of a crane as per fig. 1.
  • Figure 1 shows a timber crane 1 with a boom with two arms 3 and 4 swivelling on pillar 2.
  • Arm 3 is operated by cylinder 5 and arm 4 by cylinder 6.
  • Cylinder 5 is single-acting and cylinder 6 two-acting, pipes 7, 8 and 9 are delivery pipes.
  • the most general utilization of this construction is the simultaneous function of cylinders 5 and 6.
  • the other cylinder 6 is also extending and when the one is shortened, the other one becomes shorter, too. This occures in reaching out with the boom and in moving the grapple 17 farther out to grip a load and bring it closer and, vice versa, in moving the load to a farther spot.
  • pressurized fluid While reaching out with the boom, whereat the grapple is moved to farther out, pressurized fluid is vacant from cylinder 5.
  • This fluid can be convayed by hose 9 in order to shorten cylinder 6 , however dependant of the cross sectional area of the cylinders.
  • Usable pressurized fluids can be convayed direct to other cylinders or, when possible, to the pressure side of hydraulic pump 11, whereby they go to the advantage of any actuator.
  • FIG. 2 shows a delivery pipeline assembly for the utilizat ⁇ ion of medium from a pressurized cylinder.
  • the graph shows a valve board 10 with delivery pipes to cylinders 5 and 6. Pressure to valves (not shown) in the valve board comes from pump 11. The pressure fluid flows back to the pump along re ⁇ turn line 12 over the fluid tank.
  • pressure generated in hose 9 is convayed for the cylinder extension.
  • a pressure driven valve 14 and a directional valve 15 are used in the line that leads to cylinder 5. Unintentional extension of cylinder 6 is prevented by pressurized valve 14. Extension and conveyance of return fluid to cylinder 5 is not possible until pressure is conveyed to cylinder 6 along hose 8.
  • Directional valve 13 prevents pressurized fluid from not usable discharging over valve board 12 to return line 12.
  • the dotted line 16 shows an alternative method of utilizing pressurized fluid in conveying it to the pressure side of pump 11 in order to increase the pump de ⁇ placement.
  • cylinder 5 receives the utilized extra volume flow from the total fluid flow over valve board 10.
  • Figure 2 shows a graph of the utilization of return fluid from one cylinder only but the return fluid also of other cylinders and actuators can be conveyed as feed fluid for other actuators by a similar pipeline assembly if only the produced pressure is sufficient.
  • cylinder 5 is then such a cylinder as well as cylinder 18 in figure 1, by means of which, for instance at lowering the load in grapple 17 with boom 4 in downward slanting position, it is possible to get from the return side of a double-acting cylinder a highly pressurized fluid flow, which can be utilized in another de ⁇ vice which is in function at the same time.
  • valves (as per fig. 2) can be electrically controlled, whereby they are easy to switch on and off.
  • the inventional energy-saving operation is easy to switch on, when the facilities are there and, vice versa, one can quickly shift over to conventional control of valves if so wanted.
  • the invention is not restricted to the presented crane only but it can be modified within the limits of the inventional concept prescribed in the patent claims.
  • the invention can be applied to a number of devices utilizing compressed air or pressure fluid, whereby the actuator can be a cylinder, a turbine, a pump or a motor. It is essential that in the actuator such a pressure is generated in the medium that it can be additionally utilized for another function. Pressure can be generated by gravity, braking motion, mass inerta a.s.o.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne un procédé permettant le transport d'un fluide, en particulier dans des grues, des chargeurs et des excavatrices ayant au moins deux vérins hydrauliques (5, 6). Lorsque la pression du fluide libéré par un ou plusieurs vérins dépasse la préssion requise par un ou plusieurs autres vérins, le fluide sous pression de décharge est envoyé dans des vérins fonctionnant à une pression de travail inférieure.
PCT/FI1992/000131 1991-04-10 1992-04-30 Procede et appareil de transport d'un fluide sous pression vers des verins Ceased WO1993022233A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI911706A FI90584C (fi) 1991-04-10 1991-04-10 Menetelmä ja laitteet paineväliaineen johtamiseksi toimilaitteille

Publications (1)

Publication Number Publication Date
WO1993022233A1 true WO1993022233A1 (fr) 1993-11-11

Family

ID=8532281

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1992/000131 Ceased WO1993022233A1 (fr) 1991-04-10 1992-04-30 Procede et appareil de transport d'un fluide sous pression vers des verins

Country Status (2)

Country Link
FI (1) FI90584C (fr)
WO (1) WO1993022233A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997016372A1 (fr) * 1995-10-30 1997-05-09 Pinomaeki Sakari Procede permettant, dans un systeme a fluide de pression, d'employer et de commander une fleche de levage, en particulier en combinaison avec un engin de chantier

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 7, No. 47, M-196; & JP,A,57 195 904, 01-12-1982, (SHIMJYZU SEISAKUSHO K.K.). *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997016372A1 (fr) * 1995-10-30 1997-05-09 Pinomaeki Sakari Procede permettant, dans un systeme a fluide de pression, d'employer et de commander une fleche de levage, en particulier en combinaison avec un engin de chantier

Also Published As

Publication number Publication date
FI911706A0 (fi) 1991-04-10
FI911706L (fi) 1992-10-11
FI90584B (fi) 1993-11-15
FI90584C (fi) 1994-02-25

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