EP1772631A2 - Sicherheitsvorrichtung für hydraulische Verteilerbaugruppen - Google Patents

Sicherheitsvorrichtung für hydraulische Verteilerbaugruppen Download PDF

Info

Publication number
EP1772631A2
EP1772631A2 EP06121835A EP06121835A EP1772631A2 EP 1772631 A2 EP1772631 A2 EP 1772631A2 EP 06121835 A EP06121835 A EP 06121835A EP 06121835 A EP06121835 A EP 06121835A EP 1772631 A2 EP1772631 A2 EP 1772631A2
Authority
EP
European Patent Office
Prior art keywords
flow control
control unit
driving means
distribution unit
unit
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.)
Withdrawn
Application number
EP06121835A
Other languages
English (en)
French (fr)
Other versions
EP1772631A3 (de
Inventor
Rocco Garcea
Stefano Franceschini
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.)
SALAMI SpA
Original Assignee
SALAMI SpA
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 SALAMI SpA filed Critical SALAMI SpA
Publication of EP1772631A2 publication Critical patent/EP1772631A2/de
Publication of EP1772631A3 publication Critical patent/EP1772631A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0807—Manifolds
    • F15B13/0817—Multiblock manifolds
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0832—Modular valves
    • F15B13/0835—Cartridge type 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0846—Electrical details
    • F15B13/085—Electrical controllers
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0846—Electrical details
    • F15B13/086—Sensing means, e.g. pressure sensors
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0878—Assembly of modular units
    • F15B13/0885—Assembly of modular units using valves combined with other components
    • F15B13/0892—Valves combined with fluid components
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/008—Valve failure

Definitions

  • the present invention relates to a safety device for hydraulic distribution units, such as in particular selector valves.
  • power-using machines are generally provided with a hydraulic system for supplying the fluid power toward a distribution unit, which is constituted by one or more selector valves (of the modular and/or monolithic type), for actuating respective movements of the equipment with which said machines are provided.
  • a distribution unit which is constituted by one or more selector valves (of the modular and/or monolithic type), for actuating respective movements of the equipment with which said machines are provided.
  • said distribution units allow to operate certain movements, including the lifting and lowering of the load by means of the extension of the lifting arm, the traversal of said arm, and the lateral movement of the load.
  • the hydraulic services must be activated exclusively following an intentional action of the operator, correctly located on board the machine, on the control elements, so as to avoid for example situations of potential danger if the load lifted by the movement unit of a lift truck descends autonomously and independently of any intentional actuation of the corresponding control by the operator.
  • the aim of the present invention is to provide a safety device for hydraulic distribution units which allows to inhibit any unintentional activation of the movements of the hydraulic services without the operator being correctly positioned on board the machine or in any case in the post assigned to the control of these services.
  • an object of the present invention is to avoid accidental activations of the hydraulic services which are not the consequence of an intentional actuation of the corresponding controls by the operator.
  • Another object of the present invention is to provide a device with a structure which is simple, relatively easy to provide in practice, safe in use, effective in operation, and has a relatively low cost.
  • the present safety device for hydraulic distribution units characterized in that it comprises a first normally-closed flow control unit which can be associated with the input of a distribution unit, of the type which comprises at least one slider which can move with a reciprocating motion along a corresponding receptacle formed in a body for opening and closing ports for the passage of a working fluid, first driving means for opening the first flow control unit and first means for sensing the position of an operator at a control post for actuating said distribution unit, which are functionally associated with said driving means, the first sensing means being suitable to activate said first driving means to open said flow control unit if the operator is located at the control post.
  • the reference numeral 1 generally designates a safety device for hydraulic distribution units.
  • the device 1 can be applied in particular to selector valves of the type conventionally used in power-using machines to actuate the corresponding equipment and services.
  • the device 1 comprises a normally-closed flow control unit 2, which is associated with the input of a conventional distribution unit D which is powered by means of a working fluid such as oil or the like.
  • the flow control unit 2 is suitable to be interposed between the distribution unit D and a unit for feeding the working fluid toward said distribution unit in a modular architecture (see the hydraulic diagrams of Figures 1, 8 and 12), to be arranged in line with modular or monolithic selector valves, keeping unchanged the functions it performs ( Figure 3), and to be integrated in an appropriately provided monolithic selector valve (a solution which is not shown).
  • the distribution unit D is of the modular type, which comprises at least one slider which can move with a reciprocating motion along a corresponding receptacle which is formed in a body for opening and closing passage ports for the working fluid, such as oil or the like.
  • the feeder unit consists of a hydraulic power-using machine, generally constituted by a volumetric pump of the piston, gear, vane type etc.
  • the flow control unit 2 is interposed between the distribution unit D and a feeder device A (input head or manifold).
  • the flow control unit 2 is interposed between said devices and the distribution unit D.
  • the device 1 further has first driving means, constituted by a first electric valve 3 for opening the flow control unit 2, and first means 4 for sensing the placement of an operator at a control post which is appropriately provided for the operation of the distribution unit D.
  • first driving means constituted by a first electric valve 3 for opening the flow control unit 2, and first means 4 for sensing the placement of an operator at a control post which is appropriately provided for the operation of the distribution unit D.
  • the first sensing means 4 activate, for example by means of an electrical signal, the intervention of the first electric valve 3 to open the first flow control unit 2 if the operator is present at said control post.
  • the first sensing means 4 can be positioned for example at a seat provided in the control post and can be sensitive to the weight of the operator correctly placed so as to rest on said seat.
  • the first sensing means 4 can control a first microswitch 5, which is connected electrically to the first electric valve 3 and which, by tripping under the weight of the operator, closes the corresponding electric circuit.
  • the first sensing means 4 might also be positioned at a safety belt provided in the control post and might allow to control the closure of the first microswitch 5 only if said belt is closed by the operator located in the control post.
  • the device 1 further has second means 6 for sensing the actuation of the distribution unit D, which are associated functionally with the first electric valve 3.
  • the second sensing means 6 activate the delivery of the first electric valve 3 in order to open the first flow control unit 2 if the distribution unit D is activated by the operator.
  • the second sensing means 6 are associated with the slider of the distribution unit D so as to detect longitudinal movements of said slider along the corresponding receptacle, which indicate that the hydraulic function is activated.
  • the second sensing means 6 might be coupled for example to the control element (lever, pedals or others) that actuates the sliding of the slider.
  • the second sensing means 6 can actuate a second microswitch 7, which is connected electrically to the first electric valve 3 and trips if the slider moves, closing the corresponding electric circuit; as an alternative, the second sensing means 6 can control a magnetoinductive sensor.
  • the first and second sensing means 4 and 6 are connected in series to each other and to the first electric valve 3, so as to allow the intervention of the first electric valve 3 in order to open the first flow control unit 2 when both of the following safety conditions occur: the operator is positioned in the control post of the distribution unit D and said unit is operated intentionally.
  • the device 1 comprises means 8 for coupling the second microswitch 7 to the slider of the distribution unit D.
  • the coupling means 8 comprise a block 9 for supporting the second microswitch 7, which can be associated with the body of the distribution unit D and is provided internally with a cavity 10, which is open toward said body so that it is connected to the corresponding receptacle, a terminal element 11 which is rigidly associated with the slider and is arranged so that it can slide along the cavity 10 and cooperates with the second microswitch 7, the movable element 12 of which protrudes inside the cavity 10 through a hole provided in the block 9.
  • the terminal element 11 can slide from an inactive configuration, in which the second microswitch 7 is in such a position so as to keep the corresponding electric circuit open; any movement of the terminal element 11 from said inactive position trips the second microswitch 7, which provides clearance to the first electric valve 3 for the opening of the first flow control unit 2.
  • the terminal element 11 is provided with a groove 11 a in which the moving element 12 engages in the inactive position.
  • terminal element 11 is provided with a shank 11b which is threaded externally and is directed toward the opening of the cavity 10 for coupling to the slider.
  • the coupling means 8 comprise means for the return of the terminal element 11 to the inactive position and therefore of the slider to the neutral configuration which are of the elastic type and provide a helical compression spring 13 which is interposed between the shoulders formed by two cups 14, one fitted on the terminal element 11 and the other centered on the shank 11b and kept in position toward the opening of the cavity 10 by a ring 15.
  • the block 9 can be fixed to the body of the distribution unit D by way of threaded elements 16.
  • the second sensing means 6 have a second microswitch 7 which is applied to the slider of each selector valve by way of respective coupling means 8.
  • the various second microswitches 7 are connected electrically in parallel to each other and in series to the first microswitch 5.
  • the first electric valve 3 is of the fluid-operated type and is suitable to process a first driving fluid for opening the first flow control unit 2.
  • the driving fluid can be fed to the first electric valve 3 by the feeder means of the distribution unit D, preferably by interposing a pressure reduction valve, or by additional feeder means.
  • the first flow control unit 2 comprises a first valve body 17, which is provided with a first seat 18 which is associated with the delivery of the first electric valve 3 and is connected to at least one first input port 19 for the working fluid, at least one output port 20 for the working fluid which can be associated with the input of the distribution unit D, and at least one discharge port 21 for said fluid.
  • a first contoured shuttle 22 for opening and closing the first ports 19, 20 and 21 is accommodated so that it can slide along the first seat 18 and can move alternately between an inactive configuration and an active configuration by way of the thrust applied by the first driving fluid to a first working surface 22a thereof.
  • the first seat 18 and the first shuttle 22 may have many shapes, as shown for example in Figures 4 to 7.
  • the first shuttle 22 is suitable to connect the first input and discharge ports 19 and 21, isolating the first output port 20, while in the active configuration the first shuttle 22 is arranged so as to connect the first input and output ports 19 and 20, isolating the first discharge port 21.
  • the first input port 19 can be associated with the feeder means of the distribution unit D.
  • the first flow control unit 2 When the first shuttle 22 is in the inactive configuration, the first flow control unit 2 thus closes the flow of working fluid from the feeder means to the distribution unit D.
  • the first shuttle 22 moves to the active configuration, opening the passage for the working fluid toward the distribution unit D.
  • the first seat 18 is formed by a through hole which is provided in the first valve body 17 and is closed at the ends by respective first sealing plugs 23.
  • the first flow control unit 2 has first means 24, preferably of the elastic type, for returning the first shuttle 22 to the inactive configuration.
  • Said first return means are constituted by a helical compression spring, which is interposed between the bottom of a longitudinal dead hole 25, which is provided in the first shuttle 22 and is open at the first working surface 22a and the first plug 23a which faces it; the other first plug 23b provides the head of the hydraulic cylinder for the actuation of the first shuttle 22 and constitutes a stroke limiting abutment thereof in the inactive configuration.
  • the first valve body 17 is also provided with at least one port 26 for the return of the working fluid from the discharge of the distribution unit D, which is connected to the first seat 18.
  • the first shuttle 22 in the inactive configuration is arranged so as to connect the first input and discharge ports 19 and 21 and isolate both the first output port 20 and the return port 26 so as to prevent both sending working fluid to the input of the distribution unit D and the backflow of the working fluid from the discharge of said unit.
  • the first shuttle 22 connects the first input port 19 to the output port 20 and simultaneously connects the return port 26 to the first discharge port 21.
  • the distribution unit D is constituted by one or more selector valves, each provided with its own maximum-pressure valve, there are return ports 26 which can be associated with both valves; in Figure 1, for example, the reference numerals 26a and 26b designates the return ports which can be coupled respectively to the discharges of the maximum-pressure valves and to the discharges of the selector valves provided in the distribution unit D.
  • the device 1 can be provided with mechanical means for the actuation of the sliding of the shuttle 22 from the inactive configuration to the active configuration in emergency conditions, so as to allow for example to reposition the equipment served by the distribution unit D even if the hydraulic system fails.
  • Figures 1 and 2 are an operating diagram and a side view of the device 1 according to the first embodiment, applied to a distribution unit D which is constituted by four assembled selector valves, designated by the reference signs V1, V2, V3 and V4, in which the two central sections are associated with respective maximum-pressure valves, designated by the reference signs M2 and M3.
  • a distribution unit D which is constituted by four assembled selector valves, designated by the reference signs V1, V2, V3 and V4, in which the two central sections are associated with respective maximum-pressure valves, designated by the reference signs M2 and M3.
  • Figure 3 instead illustrates an operating diagram of the first embodiment of the invention arranged in line with modular or monolithic selector valves.
  • the first flow control unit 2 ( Figure 9) does not have the return ports 26 and the device 1 has a second normally-closed flow control unit 27 suitable to be associated with the discharge of the distribution unit D, and second driving means 28, which are constituted by a second electric valve for the delivery of a second driving fluid for opening the second flow control unit 27 which is functionally associated with at least the first sensing means 4.
  • the second flow control unit 27 can be interposed between the discharge of the distribution unit D and a conventional discharge unit for the collection, disposal and/or recovery of the working fluid.
  • the second driving fluid can be fed to the second electric valve 28 by the feeder means of the distribution unit D, preferably by interposing a pressure reduction valve, or by additional feeder means, which optionally coincide with the ones that feed the first electric valve 3.
  • the first sensing means 4 activate, for example by means of an electrical signal, the delivery of the second electric valve 28 to open the second flow control unit 27 if the operator is present at said control post.
  • the second electric valve 28 is associated functionally also with the second sensing means 6, which, in detail, activate the delivery of the second electric valve 28 in order to open the second flow control unit 27 in case of activation of the distribution unit D by the operator.
  • connection of the first and second sensing means 4 and 6 to the second electric valve 28 can be in series in order to achieve an actuation which is fully similar to the actuation of the first electric valve 3.
  • the second flow control unit 27 comprises a second valve body 29, which is provided with a second seat 30 which is associated with the delivery of the second electric valve 28 and is connected to at least one second input port 31 for the working fluid which can be associated with the discharge of the distribution unit D and at least one second output port 32 for said working fluid.
  • a second shuttle 33 is accommodated so that it can slide along the second seat 30 and is shaped to open and close the second ports 31 and 32 and is allowed to move alternately between an inactive configuration and an active configuration by way of the thrust applied by the second driving fluid to a second working surface 33a.
  • the second shuttle 33 is suitable to keep isolated the second ports 31 and 32, while in the active configuration it is positioned so as to connect said second ports.
  • the second outlet port 32 can be associated with the discharge unit.
  • the second flow control unit 27 closes the flow of working fluid from the discharge of the distribution unit D toward the discharge unit.
  • the second shuttle 33 moves to the active configuration, opening the passage for the working fluid toward the discharge unit.
  • the second shuttle 33 is arranged in the inactive configuration when the first shuttle 22 also is in the inactive configuration; likewise, the second shuttle 33 is arranged in the active configuration when the first shuttle 22 also is in the active configuration.
  • the second flow control unit 27 further comprises second means 34 for returning the second shuttle 33 to the inactive configuration, which are preferably of the elastic type.
  • this second embodiment of the device 1 also can have mechanical means for actuating the sliding of the first and second shuttles 22 and 33 from the inactive configuration to the active configuration in emergency conditions, which allow to reposition the equipment served by the distribution unit D even in case of failure of the hydraulic system.
  • the device 1 is provided with a first flow control unit 2 and a second flow control unit 27, which are arranged respectively upstream and downstream of the distribution unit D in a manner similar to said second embodiment.
  • the first flow control unit 2 comprises a first block 35, inside which ducts for connection to the working fluid supply unit, to the input of the distribution unit D and to the working fluid discharge unit are provided.
  • the first electric valve 3 is associated with the first block 35 and, differently from the preceding embodiments, is not of the fluid-operated type and actuates the translational motion of a flow control element in order to open and close the connecting ducts inside the first block 35.
  • the second flow control unit 27 comprises a second block 36, in which ducts for connection to the output of the distribution unit D and to the working fluid discharge unit are provided.
  • the second electric valve 28 is associated with the second block 36 and, differently from the preceding embodiment, is not of the fluid-operated type and actuates the translational motion of a flow control element in order to open and close the connecting ducts inside the second block 36.
  • the first and second sensing means 4 and 6 are associated electrically in series with the two electric actuation valves 3 and 28.
  • the first electric valve 3 allows to feed the distribution unit D with the intended flow-rate of pressurized fluid and at the same time the second electric valve 28 actuates the opening of the connection between the output of the distribution unit D and the discharge unit, allowing the normal operation of the machine.
  • the electric valves 3 and 28 return to the inactive position, diverting toward the discharge the flow that passes through the first block 35 and arrives from the means for feeding the working fluid and closing the connecting duct of the second block 36 between the outlet of the distribution unit D and the discharge unit.
  • the device according to the invention allows to ensure completely safe operation of machines served by a hydraulic system which comprises a distribution unit for selective supply of fluid power toward the various user devices that are provided.
  • the device according to the invention can be fitted both on newly-built distribution units and on existing distribution units.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
EP06121835A 2005-10-07 2006-10-05 Sicherheitsvorrichtung für hydraulische Verteilerbaugruppen Withdrawn EP1772631A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMO20050256 ITMO20050256A1 (it) 2005-10-07 2005-10-07 Dispositivo di sicurezza per gruppi di distribuzione oleodinamici

Publications (2)

Publication Number Publication Date
EP1772631A2 true EP1772631A2 (de) 2007-04-11
EP1772631A3 EP1772631A3 (de) 2009-11-04

Family

ID=37667445

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06121835A Withdrawn EP1772631A3 (de) 2005-10-07 2006-10-05 Sicherheitsvorrichtung für hydraulische Verteilerbaugruppen

Country Status (2)

Country Link
EP (1) EP1772631A3 (de)
IT (1) ITMO20050256A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102128183A (zh) * 2011-04-20 2011-07-20 山东泰丰液压股份有限公司 正反馈大流量插装式多路换向阀液压控制系统
CN103089721A (zh) * 2013-03-01 2013-05-08 山东泰丰液压股份有限公司 大流量电液比例插装阀差动调速液压控制系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4389154A (en) * 1981-05-13 1983-06-21 Sperry Corporation Time delay for a seat switch activated loader boom lock
US4572319A (en) * 1984-10-03 1986-02-25 Fail Safe Brake Corporation Automatic vehicle braking system
US5577876A (en) * 1994-02-22 1996-11-26 Clark Equipment Company Hydraulic interblock system
US6135230A (en) * 1998-10-09 2000-10-24 Caterpillar S.A.R.L. Interlock control system for a work machine
DE10036230A1 (de) * 2000-07-26 2002-02-14 Hydac Technology Gmbh Vorrichtung zum Bewegen schwerer Abdeckungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102128183A (zh) * 2011-04-20 2011-07-20 山东泰丰液压股份有限公司 正反馈大流量插装式多路换向阀液压控制系统
CN103089721A (zh) * 2013-03-01 2013-05-08 山东泰丰液压股份有限公司 大流量电液比例插装阀差动调速液压控制系统

Also Published As

Publication number Publication date
EP1772631A3 (de) 2009-11-04
ITMO20050256A1 (it) 2007-04-08

Similar Documents

Publication Publication Date Title
US6701823B2 (en) Method and device for controlling a lift cylinder, especially of working machines
US8322375B2 (en) Control device and hydraulic pilot control
EP1353076B1 (de) Steuersystem eines Stuhls
CN107109824B (zh) 建设机械的控制系统
KR20140021987A (ko) 제어 또는 전환 밸브를 포함하는 아마추어의 작동을 위한 유압 또는 공압 구동기
EP2545286B1 (de) Aus einzelnen einheitsventilen bestehendes doppelventil
CN102549273A (zh) 电液控制装置
US20120104294A1 (en) Valve Array with CAN Bus Circulation Valve
EP1772631A2 (de) Sicherheitsvorrichtung für hydraulische Verteilerbaugruppen
GB2309406A (en) Hydraulic overload relieving system for a mechanical press
US4391296A (en) By-pass pilot operated hydraulic check valve
US6786132B2 (en) Control device for hydraulically operated hoisting mechanisms
US6256986B1 (en) Hydrostatic drive system
EP3002465B1 (de) Hydraulikanlage
US7185673B2 (en) Safety device for fluid operated machines
US6973940B2 (en) Hydraulic control valve
US20020029810A1 (en) Hydraulic valve arrangement
CN109563850A (zh) 液压驱动设施
KR100582538B1 (ko) 기계프레스의 과부하 방지장치
EP1515052B1 (de) Doppelventil mit dynamischer Überwachung und Speicherung des Ventilpositions
SE518374C2 (sv) Tryckluftförsörjningsanläggning för fordon med en anordning för avkänning av påskjutningsfaser samt förfarande för desamma
EP2428686B1 (de) Vorrichtung zur kontrolle eines hydraulischen betätigungswerkzeuges und steuerun des steigens und des senkens einer last
CN219857343U (zh) 应急转向供油阀、转向液压系统和装载机
KR20180108837A (ko) 비상 조작 밸브 및 언로드 회로
AU2004100821A4 (en) Safety Device for Fluid Operated Machines

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

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100501