EP4001668A1 - Vorrichtung zum sequentiellen betrieb von zwei oder mehr zylindern - Google Patents

Vorrichtung zum sequentiellen betrieb von zwei oder mehr zylindern Download PDF

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Publication number
EP4001668A1
EP4001668A1 EP21208158.2A EP21208158A EP4001668A1 EP 4001668 A1 EP4001668 A1 EP 4001668A1 EP 21208158 A EP21208158 A EP 21208158A EP 4001668 A1 EP4001668 A1 EP 4001668A1
Authority
EP
European Patent Office
Prior art keywords
conduit
branch
cylinder
chamber
control 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.)
Granted
Application number
EP21208158.2A
Other languages
English (en)
French (fr)
Other versions
EP4001668B1 (de
Inventor
Alberto PEDRAZZI
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4001668A1 publication Critical patent/EP4001668A1/de
Application granted granted Critical
Publication of EP4001668B1 publication Critical patent/EP4001668B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • 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
    • 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
    • F15B2211/78—Control of multiple output members
    • F15B2211/783—Sequential control

Definitions

  • the present invention regards a device for sequential operation of two or more cylinders.
  • Operational examples in which it is necessary to operate two cylinders in sequence are represented by the control of the stabilizing feet of an operating vehicle or the operation in sequence of the extensions of the arms of cranes, for which it is required that the extension occurs according to a predetermined sequence.
  • the purpose of the present invention is to provide a device for sequentially actuating two or more cylinders that overcomes the drawbacks of currently available devices.
  • the present invention relates to a control system according to the features listed in claim 1.
  • An advantage of the device according to the present invention is that it is fully automatic, and thus does not require manual intervention by an operator.
  • Another advantage of the device according to the present invention is to be precise and reliable, always allowing the activation of the cylinders in the predetermined sequence.
  • Another advantage of the device according to the present invention is to greatly reduce the required energy expenditure.
  • a further advantage of the device according to the present invention is to allow reverse activation of the cylinders, again automatically.
  • Figure 1 shows the device according to the present invention used for sequential actuation of a first cylinder 10 and a second cylinder 11.
  • the device may also be used for actuating more cylinders, as shown in Figure 2 .
  • the device for sequentially actuating two or more cylinders comprises a first conduit 2 having a first branch 21 arranged to be connected to a chamber of a first cylinder 10 at a connection 10a.
  • the first conduit 2 further includes a second branch 22, arranged to be connected to a chamber of a second cylinder 11 at a connection 11a.
  • the first branch 21 is connected to the chamber of the first cylinder 10 which, when energized, produces piston re-entry
  • the second branch 22 is connected to the chamber of the second cylinder 11 which, when energized, produces piston exit.
  • a reverse connection would of course be possible, or a connection in which both branches 21, 22 are connected to the piston exit or re-entry chamber.
  • the device further comprises a second conduit 3 having a first branch 31 arranged to be connected to the other chamber of the first cylinder 10 at a connection 11a.
  • the second conduit 3 further includes a second branch 32, arranged to be connected to the other chamber of the second cylinder 11 at a connection 11b.
  • the first branch 31 is connected to the chamber of the first cylinder 10 which, when energized, produces the piston exit
  • the second branch 32 is connected to the chamber of the second cylinder 11 which, when energized, produces the piston re-entry.
  • a reverse connection would of course be possible, or a connection in which both branches 31, 32 are connected to the piston exit or re-entry chambers.
  • the first branch 21 of the first conduit 2 and the first branch 31 of the second conduit 3 are each connected to a chamber of the first piston 10, while the second branch 22 of the first conduit 2 and the second branch 32 of the second conduit 3 are each connected to a chamber of the second piston 10.
  • the device includes a first control valve 4 disposed along the second branch 22 of the first conduit 2.
  • the control valve 4 is provided with a poppet, which is movable between an open position, in which it allows fluid to flow, and a closed position, in which it prevents fluid from flowing.
  • the poppet When the poppet is in the open position, the control valve 4 assumes an open configuration, while, when the poppet is in the closed position, the control valve 4 assumes a closed configuration.
  • the first control valve 4 is therefore movable between an open configuration, in which it allows flow along the second branch 22 of the first conduit 2, and a closed configuration, in which it prevents flow along the second branch 22 of the first conduit 2.
  • An adjustment element 53 is disposed along the first branch 31 of the second conduit 3.
  • the control element 53 is configured to allow a discharge flow from the other chamber of the first cylinder 10 into the second conduit 3 if the pressure in the other chamber of the first cylinder 10 exceeds a predetermined value.
  • the control element 53 is a pressure control valve, which is configured to allow a discharge flow from the other chamber of the first cylinder 10 if the pressure in the other chamber of the first cylinder 10 exceeds a predetermined value and to close the passage in the direction opposite to the discharge direction.
  • a control valve 52 preferably a check valve, is arranged parallel to the control element 53 and is configured to allow a flow to the other chamber of the first cylinder 10 if the pressure in the first branch 31 in the portion facing the other chamber of the first cylinder 10 (in the portion between the control element 53 and the connection 10b) is less than the pressure in the remaining portion of the first branch 31 and to prevent flow in the opposite direction.
  • a restriction 51 is also arranged parallel to the regulating element 53 so as to allow the pressure trapped between the restriction 51 and the other chamber of the first cylinder 10 to be discharged to the second conduit 3.
  • a first pilot conduit 41 connects the first control valve 4 and the first branch 31 of the second conduit, at an intermediate point A between the connection 10b to the first cylinder 10 and the control element 53.
  • the first pilot conduit 41 drives the control valve 4 towards the closing configuration.
  • the first pilot conduit 41 is connected to the first control valve 4 such that the pressure present in the first pilot conduit 41 exerts a thrust that tends to drive the poppet of the first control valve 4 toward the closed position, and thus toward the closed configuration of the first control valve 4.
  • the device according to the present invention allows the cylinders 10, 11 to be activated sequentially in the following manner.
  • the fluid through the first branch 21 of the first conduit 2, feeds the chamber of the first cylinder 10 through the connection 10a, producing piston re-entry.
  • the fluid contained in the other chamber of the first cylinder 10 discharges to the second conduit 3 through the first branch 31 of the second conduit 3, passing through the regulating element 53.
  • the presence of the regulating element 53 provides a pressure in the first pilot conduit 41 that keeps the first control valve 4 in a closed configuration, so that the fluid cannot transit along the second branch of the first conduit 2 and cannot supply the second cylinder 11, which consequently remains inactive.
  • the device according to the present invention includes a second control valve 6 disposed along the first branch 31 between the control member 53 and the first conduit 3.
  • the second control valve 6 is also provided with a poppet, movable between an open position, in which it allows the passage of fluid, and a closed position, in which it prevents the passage of fluid.
  • the control valve 6 assumes an open configuration, while, when the shutter is in the closed position, the control valve 6 assumes a closed configuration.
  • the second control valve 6 is then movable between an open configuration, in which it allows flow along the first branch 31 of the second conduit 3, and a closed configuration, in which it prevents flow along the first branch 31 of the second conduit 3.
  • a second pilot conduit 61 is provided to connect the second control valve 6 to the second branch 22 of the first conduit 2.
  • the second pilot conduit 61 drives the second control valve 6 toward the closing configuration.
  • the second pilot conduit 61 is connected to the second control valve 6 such that the pressure present in the second pilot conduit 61 exerts a thrust that tends to drive the poppet of the second control valve 6 toward the closed position, and thus toward the closed configuration of the second control valve 6.
  • a fourth pilot conduit 62 is also provided that connects the second control valve 6 to the second conduit 2.
  • the fourth pilot conduit 62 drives the second control valve 6 toward an open configuration.
  • the fourth pilot conduit 62 is connected to the second control valve 6 such that the pressure present in the fourth pilot conduit 62 exerts a thrust that tends to drive the poppet of the second control valve 6 toward the open position, and thus toward the open configuration of the second control valve 6.
  • the fourth pilot conduit 62 allows the second control valve 6 to remain open to allow flow along the first branch 31 of the second conduit 3 out of the first cylinder 10. In essence, when pressurized fluid is fed to the first conduit 2, the pressure in the fourth pilot conduit 62 increases, moving the second control valve 6 to the open position.
  • the second control valve 6 allows the cylinders 10, 11 to be sequentially activated also for inverse movements to those described above, as follows. With the first cylinder 10 in the retracted position and the second cylinder 11 in the extended position, consider feeding pressurized fluid to the second conduit 3. The fluid feeds the chamber of the second cylinder 11 which activates the reentry of the piston. The fluid contained in the other chamber of the second cylinder 11 discharges through the second branch 22 of the first conduit 2 producing a pressure increase in the second pilot conduit 61. The pressure in the second pilot conduit 61 keeps the second control valve in a closed configuration, so that fluid cannot flow along the first branch of the second conduit 3 and thus cannot feed the first cylinder 10, which remains inactive.
  • the discharge of oil through the second branch 22 of the first conduit 2 is allowed by the first control valve 4 being driven open through a third pilot conduit 42, which connects the first control valve 4 to the second conduit 3.
  • the third pilot conduit 42 is connected to the first control valve 4 such that the pressure present in the third pilot conduit 42 exerts a thrust that tends to drive the poppet of the first control valve 4 toward the open position, and thus toward the open configuration of the second control valve 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Multiple Motors (AREA)
EP21208158.2A 2020-11-18 2021-11-15 Vorrichtung zum sequentiellen betrieb von zwei oder mehr zylindern Active EP4001668B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102020000027654A IT202000027654A1 (it) 2020-11-18 2020-11-18 Dispositivo per l'azionamento in sequenza di due o più cilindri

Publications (2)

Publication Number Publication Date
EP4001668A1 true EP4001668A1 (de) 2022-05-25
EP4001668B1 EP4001668B1 (de) 2023-08-30

Family

ID=74858496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21208158.2A Active EP4001668B1 (de) 2020-11-18 2021-11-15 Vorrichtung zum sequentiellen betrieb von zwei oder mehr zylindern

Country Status (2)

Country Link
EP (1) EP4001668B1 (de)
IT (1) IT202000027654A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29903693U1 (de) * 1999-03-02 1999-05-20 Hohenstein Vorrichtungsbau Hydraulische Werkstückspannvorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29903693U1 (de) * 1999-03-02 1999-05-20 Hohenstein Vorrichtungsbau Hydraulische Werkstückspannvorrichtung

Also Published As

Publication number Publication date
EP4001668B1 (de) 2023-08-30
IT202000027654A1 (it) 2022-05-18

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