EP0786600A1 - Hydraulisches System zur Betätigung mehrerer Verbraucher - Google Patents

Hydraulisches System zur Betätigung mehrerer Verbraucher Download PDF

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Publication number
EP0786600A1
EP0786600A1 EP97500010A EP97500010A EP0786600A1 EP 0786600 A1 EP0786600 A1 EP 0786600A1 EP 97500010 A EP97500010 A EP 97500010A EP 97500010 A EP97500010 A EP 97500010A EP 0786600 A1 EP0786600 A1 EP 0786600A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
piston
cylinder
conduit
controlled
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Withdrawn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
EP97500010A
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English (en)
French (fr)
Inventor
José Maria Las Navas Garcia
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 EP0786600A1 publication Critical patent/EP0786600A1/de
Withdrawn legal-status Critical Current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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F15B21/087—Control strategy, e.g. with block diagram

Definitions

  • This present invention refers to an activation hydraulic system with which it is feasible to establish control of a series of devices, such as, for instance, to keep conveniently controlled a number of parameters in a process, i.e. speed, temperature, etc., based on the intermittent activation of such parameter controlling devices.
  • the heat generating source may be an electric heater that connects/disconnects itself according with signals received from a sensor.
  • the system now being proposed is structured around a hydraulic group which, lacking the classical compressor, is capable of pushing or absorbing the hydraulic fluid with an exact volume control towards a single exit conduit branched in as many conduits as elements or devices should be activated, plus a complementary conduit related with a hydraulic fluid reservoir, each of the above conduits being assisted by an electrically controlled valve regulated, as the basic hydraulic group itself, by a microprocessor based on the program established therein.
  • the basic hydraulic group is in the form of a cylinder the piston of which travels inside it towards the single output conduit, against the bias of a spring and activated by a motor duly controlled by a microprocessor and through a rotary pulse generator coder and limit switches fitted on the cylinder itself, which determine the piston prearranged limit positions.
  • a microprocessor duly controlled by a microprocessor and through a rotary pulse generator coder and limit switches fitted on the cylinder itself, which determine the piston prearranged limit positions.
  • Each of these conduits also materialized in a single conduit, ends in turn in an activating hydraulic cylinder, the piston of which is moved to push by the hydraulic fluid, while its retraction takes place automatically, by means of return springs when the relevant electric valve keeping the pressure in its staunch chamber opens.
  • microprocessor should also be connected to the devices to be controlled in order to permanently receive information in regard with the parameters to control these in a more effective manner.
  • the hydraulic system being proposed is structured around a basic hydraulic group, generally referenced as (1), in which a cylinder (7) participates, inside which moves a piston (6) thus exclusively defining a hermetically closed hydraulic chamber, on a side of the piston, having one single conduit (11), said chamber housing a spring (8) tending to the volumetric increase thereof by means of the piston (6) movement in opposition to the exit conduit (11), while said piston (6) travel in the opposite direction takes place by means of a screw (5) or any other adequate transmission means, from a motor (3) conveniently fixed on the cylinder (7) with the co-operation of a common mount (4), said screw acting on the piston (6) by means of a sliding coupling such as, for instance, a spherical support allowing said screw to rotate in regard with the piston, and motor (3) being controlled by a microprocessor (25) through a power source (26) and a rotary pulse generator coder (2).
  • the single exit conduit (11) branches in a number of conduits (20), through one of which it leads to a hydraulic fluid reservoir (13), while the remaining conduits, the number of which is variable, lead to the various mechanisms to be driven or controlled and terminate in relevant hydraulic cylinders (21), (21'), (21''), (21''), each of these conduits (20) being assisted by an electric valve (15), (16), (17), (18) and (19), integrated in a group of valves (14) also controlled by the microprocessor (25) through a power source (26).
  • Every activating hydraulic cylinder (21) has an exclusive feeding conduit (20), as stated above, inside it being positioned a piston (22) which defines an also single staunch chamber on one side of it, the hydraulic fluid receiver, while on the other side is placed the return spring (23), as well as the rod (24) that, by protruding to the outside of the cylinder (21) constitutes the activation means upon its relevant device.
  • the internal return spring (23) it may optionally co-operate an external return spring (23') which will aid in evacuating.the fluid existing in the cylinder (21) when, after opening the relevant electric valve, the fluid should return to the main cylinder (7) or either to the refilling reservoir (13).
  • a pressure sensor (12) installed in the main line (11) supplies information to the microprocessor (25) in regard with the proper operation of the activation cylinders (21), namely by detecting an overpressure due to an obstruction or a pressure loss due to a hydraulic fluid leak.
  • the microprocessor (25) is assisted, as well, by a series of wires (27) allowing to perform a series of complementary functions such as loading a program, making a piston (22) to manually move in one or the other direction, detecting such pistons (22) positions, receiving information from the devices being controlled, etc.
  • valves (15) and (18) will open to allow said piston withdrawal, while should it be intended to make the opposite maneuver, that is a maneuver to push forward the same piston, the computer will activate the motor (3) making the piston run forward (6) and sending fluid towards the piston (21'') and raising it, in which case the valve (18) will be open and the valve (15) will be closed.
  • valve (18) When the propelling signal is halted, the valve (18) closes, the valve (15) opens and the motor makes the piston (6) to withdraw to receive fluid from the reservoir (13) up to the limit point detected by the limit switch (9), and at that time the motor (3) will stop and the valve (15) will close.
  • valve 15 opens to return the excess fluid to the reservoir (13) and to position the piston (6) at an intermediate point. Since only one hydraulic cylinder may be controlled at a time, should it be required to control more than one, valves (16-19) will open or close depending on which mechanism is to be controlled at every time, according with the priorities preset in the microprocessor (25) through the relevant program. Depending on the requirements for a response it will switch from a control device to another, in each case receiving signals (27) to keep the parameters to be controlled such as speed, temperature, etc., within the required limits, activating the motor in one or the other direction.
  • the microprocessor (25) will decide whether or not it requires fluid from the reservoir (13), driving back and filling the cylinder (7).
  • control time will be split up establishing a sequential control in such a way that when a conduit (20) is at an operative situation all others will be momentarily halted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP97500010A 1996-01-26 1997-01-20 Hydraulisches System zur Betätigung mehrerer Verbraucher Withdrawn EP0786600A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9600183 1996-01-26
ES9600183 1996-01-26

Publications (1)

Publication Number Publication Date
EP0786600A1 true EP0786600A1 (de) 1997-07-30

Family

ID=8293572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97500010A Withdrawn EP0786600A1 (de) 1996-01-26 1997-01-20 Hydraulisches System zur Betätigung mehrerer Verbraucher

Country Status (1)

Country Link
EP (1) EP0786600A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5620808A (en) * 1979-12-10 1981-02-26 Sanyo Kiki Kk Hydraulic pressure control system for single acting hydraulic cylinder
EP0275968A2 (de) * 1987-01-23 1988-07-27 Brueninghaus Hydromatik Gmbh Steuervorrichtung für ein hydrostatisches Getriebe für wenigstens zwei Verbraucher
GB2240836A (en) * 1987-04-03 1991-08-14 Linde Ag Drive arrangement with a primary energy source, a transmission and a pump, and method of operation thereof
WO1992010685A1 (de) * 1990-12-15 1992-06-25 Barmag Ag Hydrauliksystem
GB2265995A (en) * 1992-04-03 1993-10-13 Barmag Barmer Maschf Hydraulic system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5620808A (en) * 1979-12-10 1981-02-26 Sanyo Kiki Kk Hydraulic pressure control system for single acting hydraulic cylinder
EP0275968A2 (de) * 1987-01-23 1988-07-27 Brueninghaus Hydromatik Gmbh Steuervorrichtung für ein hydrostatisches Getriebe für wenigstens zwei Verbraucher
GB2240836A (en) * 1987-04-03 1991-08-14 Linde Ag Drive arrangement with a primary energy source, a transmission and a pump, and method of operation thereof
WO1992010685A1 (de) * 1990-12-15 1992-06-25 Barmag Ag Hydrauliksystem
GB2265995A (en) * 1992-04-03 1993-10-13 Barmag Barmer Maschf Hydraulic system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 068 (M - 067) 8 May 1981 (1981-05-08) *

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