EP0219052A2 - Dispositif de commande hydraulique - Google Patents

Dispositif de commande hydraulique Download PDF

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Publication number
EP0219052A2
EP0219052A2 EP19860113895 EP86113895A EP0219052A2 EP 0219052 A2 EP0219052 A2 EP 0219052A2 EP 19860113895 EP19860113895 EP 19860113895 EP 86113895 A EP86113895 A EP 86113895A EP 0219052 A2 EP0219052 A2 EP 0219052A2
Authority
EP
European Patent Office
Prior art keywords
pressure
control
orifice
line
control device
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
EP19860113895
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German (de)
English (en)
Other versions
EP0219052B1 (fr
EP0219052A3 (en
Inventor
Rudolf Brunner Obering
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.)
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
Original Assignee
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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Filing date
Publication date
Application filed by Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG filed Critical Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
Priority to AT86113895T priority Critical patent/ATE73905T1/de
Publication of EP0219052A2 publication Critical patent/EP0219052A2/fr
Publication of EP0219052A3 publication Critical patent/EP0219052A3/de
Application granted granted Critical
Publication of EP0219052B1 publication Critical patent/EP0219052B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0416—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor with means or adapted for load sensing
    • F15B13/0417—Load sensing elements; Internal fluid connections therefor; Anti-saturation or pressure-compensation 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/003—Systems with 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • F15B11/055—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive by adjusting the pump output or bypass
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40553—Flow control characterised by the type of flow control means or valve with pressure compensating 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41572—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and an output member
    • 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
    • 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
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • 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
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/40—Flow control
    • F15B2211/465—Flow control with pressure compensation
    • 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
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve

Definitions

  • the invention relates to a hydraulic control device of the in the preamble of claim 1 a n e g - added type.
  • the three-way flow regulator with its measuring orifice is arranged in the working pressure line and in the direction of flow to the hydraulic motor upstream of the check valve.
  • the bypass line bypasses the check valve and is also connected to the control outlet of the three-way flow controller.
  • the two-way current regulator with its metering orifice sits in the bypass line.
  • the current regulators mentioned are distinguished by the fact that they keep the quantity of pressure medium constant, depending on the current applied to the proportional magnet of the arm, regardless of the load on the hydraulic motor, and by changing the current applied to its proportional magnet, they sensitively change the speed of the hydraulic motor, again independently of the load to let.
  • a control device was developed, as is known from DE-OS 32 33 046, Fig. 1.
  • a two-way flow regulator with a heating screen operated by a single proportional magnet is only provided in the bypass line to the tank.
  • the current regulator influences the quantity of pressure medium flowing from the pressure source to the hydraulic motor or from the hydraulic motor into the tank in that it discharges a quantity of pressure medium into the tank that is dependent on the current applied to the proportional magnet.
  • the pressure source is a pump that only runs against the load when the hydraulic motor is working and is driven by a shunt-electric motor, in which the delivery rate per unit of time changes with increasing back pressure.
  • the two-way flow controller to the tank cannot compensate for these changes, which means that the hydraulic motor works slower with increasing load and faster with decreasing load. This is undesirable in practice, where sensitive speed control is important. In addition, an undesirable shift jerk occurs when starting.
  • the invention has for its object to provide a control device of the type mentioned, which is characterized by a reduced structural complexity and by a load-independent speed control of the hydraulic motor in both directions.
  • a second proportional magnet and a second measuring orifice are omitted because the single measuring orifice works with its proportional magnet, depending on the selected direction of movement of the hydraulic motor, either with the three-way or with the two-way flow controller. Since only a single proportional magnet needs to be controlled, the control effort is also reduced.
  • the control device works independently of the load, because the three-way flow controller, when the hydraulic motor works against the load, conducts the pressure medium quantity predetermined by the proportional magnet to the hydraulic motor independently of the back pressure generated by the load and thereby varies the quantity of pressure medium discharged to the return line.
  • the three-way flow controller compensates for changes in the delivery rate of the pressure medium pump under load. The speed of the hydraulic motor can be controlled sensitively.
  • the embodiment of claim 2 is useful because the shut-off valve, which saves a separate load holding valve, prevents the pressure medium from flowing out via the pressure compensator of the two-way flow regulator when the three-way flow regulator is actuated.
  • the two pressure compensators do not interfere with each other despite the common measuring orifice, because one only works tet when the pressure in front of the orifice plate is higher than behind it, while the other only works with reverse pressure conditions.
  • the feature of claim 3 is also important so that the work of the three-way flow regulator is not impaired when the shut-off valve is released. There is thus a free flow connection from the control outlet of the three-way flow regulator to the tank, despite the bypass line being shut off.
  • a structurally simple embodiment is further evident from claim 5.
  • the pump input channel takes over the pressure medium supply to the control orifice of the three-way flow regulator, which is formed by the control edge of the control piston and the tank connection, while the side inlet with the pump input channel takes over the function of the control orifice when the two-way flow regulator is working.
  • the feature of claim 6 also contributes to the structural simplification, because the springs required for the opposite working of the pressure compensator in both directions are united in a spring arrangement.
  • Claim 7 is also expedient.
  • the solenoid-operated shut-off valve is expediently coupled in terms of control technology to the proportional magnet of the measuring orifice.
  • the pressure compensator of the two-way flow controller can be used because the pressure compensator takes on a travel or control function for these operating states while the control function is switched off.
  • This also has the advantage that the shift jerk does not occur in one or the other direction of movement of the hydraulic motor when starting up, because when pressure is maintained in the pressure compensator, no significant pressure medium volumes flow out which would have to be compensated for when the hydraulic motor started to move.
  • the additional function of the pressure compensator of the two-way flow controller is particularly important with a view to simplifying the construction of the control device.
  • the selectively switchable path or control function of the pressure compensator can be achieved in a simple manner. As soon as the side of the pressure compensator on which it can be acted upon in the opening direction is relieved of pressure, the pressure acting on the other side of the pressure compensator brings the pressure compensator into its shut-off position, which it maintains reliably even over longer load holding periods because there is no pressure in the opening direction counterpressure acting horizontally.
  • the latter goal can be achieved particularly easily with the measures of claim 10.
  • the 2/3-way valve is small and inexpensive and almost leak-free. It only has to process small amounts of pressure medium.
  • the measure of claim 13 is also important because it creates the possibility of stopping the hydraulic motor with the path or control function of the pressure compensator and for switching off its control function. This has the advantage that the orifice plate can be released from this task, so that the hydraulic motor, so to speak stops against the pressure compensator. This also avoids a possible stopping jerk, which in connection with the other measures which bring about a jerk-free start-up leads to an almost ideal control of the movement of the hydraulic motor.
  • the lifting module component requires little space for accommodation and contains all the components necessary for the correct operation of the control device.
  • a control device previously operated with conventional control devices can be converted with little effort because the lifting module component can have essentially the same connections and connection diagrams as the conventional control devices.
  • a hydraulic control device 1 according to FIG. 1 is part of a bub device, not shown, for example a forklift, and is used to actuate a hydraulic motor 2, for example a single-acting hydraulic cylinder, with a piston 3, which can be extended against a load F and under the action of Load F is retractable.
  • a pressure source 4 for example a pump driven by a shunt electric motor, is provided, which conveys pressure medium from a tank 5.
  • a measuring orifice 7 is arranged in a housing 6 and is actuated by a proportional magnet 8, in proportion to an electrical signal (control current) which can be changed in the control range according to any profile.
  • a pressure compensator arrangement 10 with two pressure compensators is also provided in a housing 9 that is either combined with the housing 6 or separated from it.
  • the heat shield 7 forms with the upstream pressure compensator assembly 10 a three-way flow regulator and a two-way flow regulator, the three-way flow regulator for controlling the speed of the hydraulic motor 2 against the load F and the two-way flow regulator for controlling the speed of the hydraulic motor 2 under the load F is provided.
  • the pressure source 4 is connected to the hydraulic motor 2 via a working pressure line 11, which consists of three successive line sections 11a, 11b, 11c.
  • the first power section 11a is connected to the housing 9 and contains a check valve 12 opening in the direction of flow to the hydraulic motor 2.
  • a pressure relief valve 14 is provided in a color line 12a branching from the line section 11a to the housing 9 to limit the maximum system pressure.
  • the bypass line 15 leads to a connection bore 24 in the housing 9 and, like the parallel line 13, is connected to the tank 5 via a tank line 18.
  • a control sleeve 20 is fixed in a housing chamber 19, which has a pump inlet channel 21 in the form of several bores distributed in the circumferential direction and the ring channel 22 on the outer circumference, to which the line section 11a is connected on one side and the bypass line on the other side. Furthermore, a further outer ring channel 23 is provided in the control sleeve 20 at a distance from the ring channel 22, from which tank connections 25 distributed over the circumference lead to the interior of the control sleeve 20. The ring channel 23 is connected to the line 18 and the tank via the connection bore 25.
  • the side of the housing chamber 19 adjacent to the tank connection 25 is connected to the housing 6 of the measuring orifice 7 via the second line section 11b.
  • the side 27 of the housing chamber 29 facing away from the tank connection 25 is separated from the side 26 by a regulating piston 28 belonging to two pressure compensators, the regulating piston 28 being displaceably sealed in the control sleeve 20.
  • the control piston 28 is in its basic position, in which it is aligned with a side inlet 29, which is for example an annular channel, to the pump inlet channel 21.
  • the inlet 29 communicates with the interior of the control piston 18, ie with the side 26 of the housing chamber 19.
  • the control piston 28 In the area of the tank connection of the control sleeve 20, the control piston 28 has a peripheral control edge 30.
  • the control piston 28 covers the tank connection 25 in a sealing manner.
  • a spring 31 is arranged, which is supported between spring abutments 32 and 33 and is connected to the control piston 28 via a pull rod 34.
  • Both spring abutments 32 and 33 are supported in the housing 9 and can move when the Control piston 28 are lifted from a basic position to each side, so that the control piston 28 must move in both directions of movement against the force of the spring 31.
  • a control line 35 leads from the side 27 of the housing chamber 19 through a throttle 36 to the measuring orifice 7.
  • the measuring orifice 7 has an annular channel 37 in the housing 6, which is connected to the side 26 of the housing chamber 19 of the pressure compensator arrangement 10 via the second line section 11b.
  • the ring channel 37 belongs to a housing bore 46 and is separated from a bore section 47 by a control edge 38.
  • an orifice piston 39 can be displaced in a sealed manner and is provided in its lower edge region with triangular notches 40 which, together with the control edge 38, form the actual orifice plate.
  • a spring 41 loads the diaphragm piston 39 in the upward direction into the end position shown in FIG.
  • a pin 42 is provided which plunges into a through hole 43, via which the pressure under the orifice piston 39 is transmitted to the other side, so that the orifice piston 39 is pressure-balanced.
  • an actuating pin 44 of the proportional magnet 8 which is designed so that it is excited when the.
  • Aperture piston 39 pushes into a lower and shut-off position, in which the lower end 44 of the actuating pin sits on a stop.
  • a bore section 47 from which the third line section 11c leads to the hydraulic motor 2, is connected to the side 27 of the housing chamber 19 via the control line 35 and closed to the outside by a sealing plug 48.
  • FIG. 2 the structure of the essential components of the control device 1 from FIG. 1 is shown in a symbolic representation, these components forming a lifting module component M, all of which in and on a housing working components, including the actuating magnet 45 for the shut-off valve 16 in the bypass line 15.
  • the proportional magnet 8 is fully excited; the orifice piston 39 moves downward; the control panel 7 is closed.
  • the shut-off valve 16 remains in the shut-off position.
  • the pressure medium flow coming from the pump 4 in the line section 11a is divided on the one hand via the line sections 11b, c and the measuring orifice 7 toward the hydraulic motor 2 and on the anterior side via the control orifices 25, 30 and the tank line 18 to the Tans 5 flowing partial flows.
  • the size of the partial flow flowing to the hydraulic motor 2 results from the pressure equilibrium at. the pressure difference across the orifice plate 30, 25 is equal to the pressure difference across the orifice plate 7 plus the pressure generated by the load F.
  • the cross section of the orifice plate 7 is preselected by the proportional magnet 8.
  • the pressure difference across the orifice plate 7 produces on the control piston 28 a force directed to the left in FIG. 1, which displaces it against the force of the spring 31 until the pressure difference required for the aforementioned pressure balance is established on the control orifice 25.30. Changes then the load, then with the position of the control piston 28 unchanged, the partial flow through the control orifice 30, 25 would be changed, which would also result in a change in the partial flow flowing through the orifice 7 and thus the pressure difference across the orifice 7.
  • the partial flow flowing to the hydraulic motor 2 through the line section 11c is also kept constant when the pump 4 decreases in its delivery rate or reduces its delivery rate due to the back pressure. Then, correspondingly less pressure medium flows into the tank via the control orifice 25, 30 and the line 18, so that the hydraulic motor 2 receives the unchanged partial flow.
  • the triangular notches 40 of the orifice piston 39 ensure a steady or linear control characteristic.
  • the pump 4 is first switched off and, when the proportional magnet 8 is fully excited, the shut-off valve 16 in the bypass line 15 is switched to its open position.
  • the excitation of the proportional magnet 8 is reduced according to the desired speed.
  • the pressure medium flow displaced by the hydraulic motor 2 by the load F flows via the measuring orifice 7 to the right side 26 of the housing chamber 19 and from there through the regulating orifice 21.29 which forms into the bypass line 15, through the shut-off valve 16 and the tank line 18 to the tank 5.
  • the control piston 28 Due to the pressure difference across the orifice plate 7, the pressure upstream of the orifice plate (bore section 47) is greater than the pressure in the annular space 37, so that the control piston 28 is shifted to the right in FIG. 1 and the pump inlet channels 21 with the side inlets 29 are a control plate form.
  • the size of the pressure medium flow to the tank 5 results from the pressure equilibrium, at which the pressure caused by the load is the same as the pressure difference across the measuring orifice 7 plus the pressure difference through the control orifice 21, 29.
  • the control piston 28 is shifted to the right until the required pressure difference at the control orifice 21, 29 is constant over the measuring orifice 7 and thus also the pressure medium flow to the tank 5, i.e. for the pressure equilibrium mentioned above. the speed of the hydraulic motor 2 remain constant.
  • shut-off valve 18 is simultaneously brought into the blocking position, so that the load is held in front of the shut-off valve 16 and by the check valve 12.
  • the measuring orifice 7 could also be arranged in the working pressure line in the flow direction to the hydraulic motor 2 in front of the pressure compensator arrangement 10.
  • the function would be the same.
  • the shut-off valve 16 could also be another control element that can be brought from a locking position into a through position.
  • FIGS. 1 and 2 shows a modified hydraulic control device 1 'which is constructed similarly to the control device 1 according to FIGS. 1 and 2.
  • the pressure compensator arrangement 10' is different because the pressure compensator forming the two-way flow regulator with the measuring orifice 7 53 is arranged with the control orifice 50 in the first bypass line 15 'to the tank 5, while the other pressure compensator 54, which forms the three-way flow regulator with the measuring orifice 7, with its control orifice 52 in a second, upstream of the check valve 12 from the working pressure line 11 to the tank branching bypass line 51 is arranged.
  • the two control orifices 5C and 52 are driven in opposite directions to one another, ie the control orifice 50 of the pressure compensator 53 is in the closing direction via a control line 55 with a control pressure tapped between the measuring orifice 7 and the hydraulic motor 2 and in the opening direction via a control line 56 with one between the check valve 12 and the orifice 7 tapped control pressure and the force of a spring 59, while the orifice 52 of the other pressure compensator in the closing direction by the force of a spring 63 and a tapped between the orifice 7 and the hydraulic motor 2 and transmitted by a control line 62 control pressure and in the Opening direction is acted upon by a control pressure tapped from the bypass line 51 via a control line 61.
  • the control piston provided there is indicated at 64 at the control orifice 52.
  • a 2/3 directional control valve 57 is provided, which is expediently a seat valve, and in the illustrated shut-off position interrupts the control line 56 and the side of the control orifice 50 on which its control piston is acted upon in the opening direction, via a line 58 to Relieved tank.
  • the tank line 58 is disconnected and the passage through the control line 56 is free.
  • the 2/3-way valve 57 it is possible to assign a pressure or control function to the pressure compensator 53 or the control orifice 50 and to optionally switch off the control function, which has the advantage that the control orifice 50 is in the shut-off position in the directional or control function remains or occupies it, regardless of how the orifice 7 is adjusted. In this way, the load pressure in the working pressure line 11 can be maintained without an additional load holding valve. Since the load in the control line 62 is higher than in the control line 61 and because the force of the spring 63 on the control panel 52 is effective in the closing direction, the control panel 52 is also reliable in the shut-off position, so that the front the check valve 12 lying part of the working pressure line 11 is not involuntarily relieved of pressure.
  • a biasing valve 60 is provided in the first bypass line 15 ', which is set to a biasing pressure which is greater than the opening pressure of the control orifice 50 predetermined by the force of the spring 59, specifically in the event that the piston 3 of the hydraulic motor 2 on the stop ge can be driven so that the pressure in the working line 11 may drop below the opening pressure of the control orifice 50 and this could go into its open position in an uncontrolled manner.
  • the pressure medium would then flow unhindered through the open control orifice 50 and the hydraulic motor would not start its travel movement.
  • control line 61 ' is connected in the flow direction behind the check valve 12 and the biasing valve 60' is dependent on the pressure between the measuring orifice 7 and the hydraulic motor 2 a control line 66 is hydraulically controlled against a spring 65, which is designed so strong that it automatically brings the preload valve 60 'into the shut-off position as soon as the pressure in the control line 66 drops below the opening pressure of the regulating orifice 50 of the pressure compensator It would also be conceivable to provide an actuating magnet instead of the pressure pilot control via the control line 66, which is de-energized when the pressure drops.
  • the proportional magnet 8 is excited to completely close the measuring orifice 7 when the pump 4 is switched off and then partially de-energized again according to the desired speed, so that the measuring orifice generates a certain pressure difference for the outflow of the pressure medium.
  • the 2/3-way valve 57 is switched to the through position, so that the control orifice 50 takes over its control function again, that is, it allows so much pressure medium to flow into the tank via the bypass line 15 that the set pressure difference is maintained at the orifice 7 regardless of whether the load pressure changes or not. If the piston 3 of the hydraulic motor 2 travels to its lower end position, the pressure in the working pressure line would drop to 0.
  • Daa pre-valve 60 closes, so that a pressure is always maintained in the working pressure line 11 and thus in the control line 55, which is higher than the opening pressure of the regulating orifice 50, so that its path or control function when 2/3 is in the blocking position
  • Directional control valve 57 is not lost.
  • control device 1 works essentially the same as the control device 1 '.
  • the control pressure for the control orifice 52 of the pressure compensator of the three-way flow regulator which is effective when the pump 4 is switched off in the control line 61' is nevertheless not able to open the control orifice 52, because the control pressure in the control line 62 and the force of the spring are effective in the closing direction.
  • the preload valve 60 ' is brought into the at, blocking position by the spring 65 in a pressure-dependent manner when the pressure in the working pressure line threatens to drop.
  • the other functions run as described above.
  • FIGS. 3 and 4 are distinguished by the omission of a separate load-holding valve on the one hand and by an almost ideal jerk-free control behavior on the other.
  • a fixedly set orifice plate 7 could also be provided for both pressure compensators, for example in a loading platform control, in which the same and working from the set speeds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Servomotors (AREA)
EP86113895A 1985-10-10 1986-10-07 Dispositif de commande hydraulique Expired - Lifetime EP0219052B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113895T ATE73905T1 (de) 1985-10-10 1986-10-07 Hydraulische steuervorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853536219 DE3536219A1 (de) 1985-10-10 1985-10-10 Hydraulische steuervorrichtung
DE3536219 1985-10-10

Publications (3)

Publication Number Publication Date
EP0219052A2 true EP0219052A2 (fr) 1987-04-22
EP0219052A3 EP0219052A3 (en) 1989-10-25
EP0219052B1 EP0219052B1 (fr) 1992-03-18

Family

ID=6283298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113895A Expired - Lifetime EP0219052B1 (fr) 1985-10-10 1986-10-07 Dispositif de commande hydraulique

Country Status (7)

Country Link
US (1) US4711155A (fr)
EP (1) EP0219052B1 (fr)
JP (1) JPS6298005A (fr)
AT (1) ATE73905T1 (fr)
DE (2) DE3536219A1 (fr)
ES (1) ES2030384T3 (fr)
GR (1) GR3004569T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140174575A1 (en) * 2012-12-25 2014-06-26 Zhejiang Dunan Hetian Metal Co., Ltd. Wheatstone bridge check valve arrangement

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712716A1 (de) * 1986-08-01 1988-02-04 Man Nutzfahrzeuge Gmbh Verfahren zum verlustarmen veraendern des foerderstromes einer konstantspeisepumpe und vorrichtung zur durchfuehrung des verfahrens
US5046310A (en) * 1989-04-04 1991-09-10 Mannesmann Rexroth Gmbh Load-independent control device for hydraulic load devices
DE4423644C2 (de) * 1994-07-06 1998-10-01 Buchholz Hydraulik Hydraulische Steuervorrichtung
US6116263A (en) * 1998-07-23 2000-09-12 Hydraforce, Inc. Proportional priority flow regulator with reverse flow control
AT408208B (de) * 2000-02-22 2001-09-25 Hoerbiger Hydraulik Anordnung zur hydraulischen betätigung eines bewegten teils an fahrzeugen, insbesondere eines verdecks, eines heckdeckels, einer abdeckklappe oder dgl.
JP2018155341A (ja) * 2017-03-17 2018-10-04 Ｋｙｂ株式会社 ソレノイドバルブ及びこれを備える流体圧アクチュエータの制御装置
JP7304205B2 (ja) * 2019-05-31 2023-07-06 Ｋｙｂ株式会社 流体圧装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE309834B (fr) * 1965-12-28 1969-04-08 Asea Ab
JPS504958U (fr) * 1973-05-16 1975-01-20
DE2659870C3 (de) * 1976-01-21 1980-10-02 Danfoss A/S, Nordborg (Daenemark) Anordnung zur Beeinflussung der Arbeitsmenge eines Servomotors
US4249641A (en) * 1978-11-14 1981-02-10 Hitachi, Ltd. Speed control system for hydraulic elevator
DE3103745A1 (de) * 1981-02-04 1982-09-02 Sperry-Vickers Zweigniederlassung der Sperry GmbH, 6380 Bad Homburg Hydraulische hubeinrichtung
JPS5925761B2 (ja) * 1982-05-06 1984-06-21 工業技術院長 衣料害虫用防虫剤
DE3233046C2 (de) * 1982-09-06 1985-12-12 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 8000 München Hydraulische Steuervorrichtung
DE3434014A1 (de) * 1984-09-15 1986-03-20 Beringer-Hydraulik GmbH, Neuheim, Zug Hydraulische steuerung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140174575A1 (en) * 2012-12-25 2014-06-26 Zhejiang Dunan Hetian Metal Co., Ltd. Wheatstone bridge check valve arrangement
US9328832B2 (en) * 2012-12-25 2016-05-03 Zhejiang Dunan Hetian Metal Co., Ltd. Wheatstone bridge check valve arrangement

Also Published As

Publication number Publication date
DE3536219C2 (fr) 1988-03-17
GR3004569T3 (fr) 1993-04-28
DE3536219A1 (de) 1987-04-16
EP0219052B1 (fr) 1992-03-18
EP0219052A3 (en) 1989-10-25
DE3684402D1 (de) 1992-04-23
US4711155A (en) 1987-12-08
ATE73905T1 (de) 1992-04-15
JPS6298005A (ja) 1987-05-07
ES2030384T3 (es) 1992-11-01

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