WO2004111467A1 - Support leg valve - Google Patents

Support leg valve Download PDF

Info

Publication number
WO2004111467A1
WO2004111467A1 PCT/SE2004/000951 SE2004000951W WO2004111467A1 WO 2004111467 A1 WO2004111467 A1 WO 2004111467A1 SE 2004000951 W SE2004000951 W SE 2004000951W WO 2004111467 A1 WO2004111467 A1 WO 2004111467A1
Authority
WO
WIPO (PCT)
Prior art keywords
consumer
valve
flow
priority
chamber
Prior art date
Application number
PCT/SE2004/000951
Other languages
English (en)
French (fr)
Inventor
Martin Marklund
Original Assignee
Hydrauto Valves 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
Application filed by Hydrauto Valves Ab filed Critical Hydrauto Valves Ab
Priority to EP04749000A priority Critical patent/EP1633987B1/en
Priority to AT04749000T priority patent/ATE548569T1/de
Publication of WO2004111467A1 publication Critical patent/WO2004111467A1/en

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/022Flow-dividers; Priority valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20546Type of pump variable capacity
    • F15B2211/20553Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/31Directional control characterised by the positions of the valve element
    • F15B2211/3105Neutral or centre positions
    • F15B2211/3116Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/405Flow control characterised by the type of flow control means or valve
    • F15B2211/40515Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/42Flow control characterised by the type of actuation
    • F15B2211/428Flow control characterised by the type of actuation actuated by fluid pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/45Control of bleed-off flow, e.g. control of bypass flow to the return line
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/605Load sensing circuits
    • F15B2211/6051Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78Control of multiple output members
    • F15B2211/781Control of multiple output members one or more output members having priority

Definitions

  • the present invention concerns a hydraulic valve with integrated priority valve, especially a support leg valve on a truck-mounted timber crane, according to the preamble to claim 1.
  • loading is prepared by lowering a pair of support legs located on one side of the cargo space to the ground which can be extended or contracted telescopically in order to obtain a horizontal position of the cargo space.
  • the support legs are used to stabilise the part of the chassis that contains the cargo space, e.g. a truck or its trailer. Without stabilisation, the chassis part may lean in the direction of the load in the crane and impair control of the loading process resulting in a longer working time.
  • the valve that controls the movement of the support leg is used for a brief period before operating the crane.
  • the support leg valve is often coupled in series with the cock and comprises one open centre valve and is first in the series. This means the flow of hydraulic oil to the crane's functions flows first through the support leg valve, which is consequently always pressurised.
  • the support leg valve can also be connected in parallel with the cock via a separate priority valve.
  • the support leg valve is a valve with closed centre arranged with an outer pilot line through which a pilot pressure flows to the priority valve regulating the flow.
  • Another variant is to connect the support leg valve in parallel with a cock via an external pilot line with a load sensing pressure.
  • the pilot line is arranged with a nonreturn valve to lead the load sensing pressure from the support leg valve to a shunt valve arranged in the cock.
  • the support leg valve is a valve with closed centre. Both of these couplings involve a relatively costly arrangement and require relatively complicated hose arrangements in relation to the intended purpose.
  • a further method of solving problems that arise in conjunction with support leg functions is to use a pump with variable displacement and parallel couple the valves via a switch valve regulated by the driver.
  • the support leg valve is then often a load sensing valve with closed centre.
  • One disadvantage is that the valve controlling the support leg is constantly under pressure when operating the crane, which may give unwanted movements of the support leg due to the natural leakage inside the slide valves.
  • This problem can be solved by fitting a separate priority valve in the system with an output port to the support leg valve and a port to the cock.
  • the priority valve is controlled by a signal from the support leg valve, which is often achieved through a pilot line giving a pilot flow from the support leg valve to the priority valve.
  • One object of the present invention is to achieve a valve for operating principally the support legs of a timber crane mounted on a truck and also the control of, for example, moving the driver's cab or log carriages in a simple and cheap way without complicated hose arrangements or additional valves.
  • Another object is to be able to use the arrangement together with a hydraulic pump with either variable or fixed displacement.
  • the support leg valve comprising a one-piece unit with integrated priority valve and control valves with closed centres, the control valves regulating the flow via a signal pressure through a passage in the housing to the priority valve.
  • a valve according to the invention comprises a one-piece valve housing 1 with an inlet port 2 connected to a hydraulic pump (P) with fixed or variable displacement, an outlet port 3 connected to a hydraulic tank (T), an outlet port 4 connected to the valve 5:1 controlling the functions of a consumer, such as a crane, and, in this embodiment, outlets to four consumers 5:2a - 5:2d with four identical control valves 6 a-d for controlling support legs, carriages and similar functions.
  • the valve can be adapted to the demands placed on its functions in addition to, for example, support legs and carriages, through several control valves being able to be coupled together with the valve housing 1.
  • the inlet port 2 is coupled to a priority valve 7 integrated in the valve housing 1 in which a spring-loaded slide 8, called the priority slide, is located.
  • a first chamber 9 for building up hydraulic pressure from the inlet port 2.
  • a second chamber 10 To the other end of the slide is arranged a second chamber 10.
  • the second chamber 10 is connected to load sensing pressure via a passage 11 from the control valve slides 6 a-d.
  • a spring 12 a coil spring for instance, with one end resting against the inside of the chamber 12 and the other end against the valve housing. Through the force of the spring 12, the slide 8 is pressed towards the first chamber 9, i.e. in the direction of arrow A, to a first end position.
  • the inlet port 2 is in connection via the priority valve 7 with the control valves 6 a-d via a passage 13 with a first restriction 14.
  • the load sensing pressure passage 11 is arranged with a connection to the tank T via a passage 15 with a second restriction 16.
  • the slides in the control valves 6 a-d arranged with a first flow groove 17 of increasing size to successively open the flow path to one of the consumers 5-2a - 5:2d, for instance a support leg.
  • the slides of the control valves 6 a-d are also equipped with a second flow groove 18, which is in connection with the second chamber 10 in the priority valve 7.
  • control valve 6a-6d When a control valve 6a-6d is operated, i.e. the valve controlling the functions of consumer 5:2a-5:2d, for instance the support leg, a valve will be activated, i.e. control valve slide 6a will be displaced in the direction of the arrow A in figure 1.
  • the flow groove 17 arranged in the slide will open successively, whereby the flow of hydraulic oil to the support leg will gradually increase.
  • the second flow groove 18 will open successively to gradually increase the flow to the passage 11 for the load sensing pressure. This will mean the pressure in the second chamber 10 will rise, whereby the priority slide 8 will be displaced to centre position where the pressure in passage 13 corresponds to the total pressure of the spring 12 and the pressure in the second chamber 10.
  • a drain 19 has been arranged to the tank T at the second restriction 16. The drain 19 delivers a certain flow from the second flow groove 18 in the control valve slide 6a-6d to the tank T and thereby the desired drop in pressure before it reaches the second chamber 10.
  • the control valves slides 6a-6d are designed so that the drain 19 will close at the second restriction 16 for large valve actuations, whereby the first restriction 14 has the greatest effect as the main flow passes through the passage 13.
  • the size of this first restriction 14 can be adapted to provide a limited maximum flow for large valve actuations. This can be used to provide a smooth control of the consumers 5:2a -5:2d without any sudden movements.
  • the priority slide 8 regulates the drop in pressure across the restriction 14 to a constant value, whereby this maximum flow becomes independent from the load, i.e. the support leg in this example will maintain a constant speed irrespective of the load.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Servomotors (AREA)
  • Pens And Brushes (AREA)
  • Forging (AREA)
  • Check Valves (AREA)
  • Multiple-Way Valves (AREA)
PCT/SE2004/000951 2003-06-19 2004-06-16 Support leg valve WO2004111467A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04749000A EP1633987B1 (en) 2003-06-19 2004-06-16 Support leg valve
AT04749000T ATE548569T1 (de) 2003-06-19 2004-06-16 Stützfussventil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0301777-9 2003-06-19
SE0301777A SE525355C2 (sv) 2003-06-19 2003-06-19 Stödbensventil

Publications (1)

Publication Number Publication Date
WO2004111467A1 true WO2004111467A1 (en) 2004-12-23

Family

ID=27607343

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2004/000951 WO2004111467A1 (en) 2003-06-19 2004-06-16 Support leg valve

Country Status (5)

Country Link
EP (1) EP1633987B1 (sv)
CN (1) CN100480517C (sv)
AT (1) ATE548569T1 (sv)
SE (1) SE525355C2 (sv)
WO (1) WO2004111467A1 (sv)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0705630A1 (en) * 1994-10-05 1996-04-10 VELP SCIENTIFICA srl Distilling apparatus with controlled vapour flow
US6314997B1 (en) * 1999-05-21 2001-11-13 Shimadzu Corporation Multiple valve apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3861769D1 (de) * 1987-02-19 1991-03-14 Zahnradfabrik Friedrichshafen Hydraulikeinrichtung mit einer regelbaren pumpe.
CN2224944Y (zh) * 1994-01-24 1996-04-17 奉化豪发液压气动有限公司 液压多路换向阀
GB9425273D0 (en) * 1994-12-14 1995-02-08 Trinova Ltd Hydraulic control system
IT1292919B1 (it) * 1997-05-13 1999-02-11 Mita Oleodinamica Spa Distributore per un sollevatore idraulico a posizione e sforzo controllati per trattori e macchine agricole.
CN2504157Y (zh) * 2001-07-02 2002-08-07 温州市液压件厂 新型汽车起重机下车液压多路阀

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0705630A1 (en) * 1994-10-05 1996-04-10 VELP SCIENTIFICA srl Distilling apparatus with controlled vapour flow
US6314997B1 (en) * 1999-05-21 2001-11-13 Shimadzu Corporation Multiple valve apparatus

Also Published As

Publication number Publication date
SE525355C2 (sv) 2005-02-08
EP1633987B1 (en) 2012-03-07
CN1809698A (zh) 2006-07-26
ATE548569T1 (de) 2012-03-15
EP1633987A1 (en) 2006-03-15
CN100480517C (zh) 2009-04-22
SE0301777D0 (sv) 2003-06-19
SE0301777L (sv) 2004-12-20

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