EP3436705A1 - Control device - Google Patents

Control device

Info

Publication number
EP3436705A1
EP3436705A1 EP17711095.4A EP17711095A EP3436705A1 EP 3436705 A1 EP3436705 A1 EP 3436705A1 EP 17711095 A EP17711095 A EP 17711095A EP 3436705 A1 EP3436705 A1 EP 3436705A1
Authority
EP
European Patent Office
Prior art keywords
valve
pilot
control
control device
hydraulic
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
EP17711095.4A
Other languages
German (de)
French (fr)
Other versions
EP3436705B1 (en
Inventor
Christoph Stönner
Sascha Alexander Biwersi
Peter Jakobs
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.)
Hydac Systems and Services GmbH
Original Assignee
Hydac Systems and Services 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 Hydac Systems and Services GmbH filed Critical Hydac Systems and Services GmbH
Publication of EP3436705A1 publication Critical patent/EP3436705A1/en
Application granted granted Critical
Publication of EP3436705B1 publication Critical patent/EP3436705B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • 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
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/166—Controlling a pilot pressure in response to the load, i.e. supply to at least one user is regulated by adjusting either the system pilot pressure or one or more of the individual pilot command pressures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/20—Control systems or devices for non-electric drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B66C23/90—Devices for indicating or limiting lifting moment
    • 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
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • 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
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/3059—Assemblies of multiple valves having multiple valves for multiple output members
    • F15B2211/30595—Assemblies of multiple valves having multiple valves for multiple output members with additional valves between the groups of valves for multiple 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed 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
    • F15B2211/30—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
    • F15B2211/40—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
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the 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
    • F15B2211/50—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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6052—Load sensing circuits having valve means between output member and the load sensing circuit using 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/61—Secondary circuits
    • F15B2211/611—Diverting circuits, e.g. for cooling or filtering
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/615—Filtering means
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/85—Control during special operating conditions
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/875—Control measures for coping with failures
    • F15B2211/8755—Emergency shut-down

Definitions

  • the invention relates to a control device for at least one hydraulic working section, which is connectable via a hydraulic supply circuit and a pilot pressure-supplied control valve to a pressure supply source and a return, with an emergency stop device comprising a pilot solenoid valve and another valve.
  • a generic hydraulic control device for at least one hydraulic consumer is known from EP 1 686 268 B1, whose at least one working line can be connected to a pressure source and a return via a directional control valve, with a load pressure control circuit and with an emergency stop system, the supply line leading to the directional control valve at least one passage position druckvorteiles, spring-loaded to the blocking position separating valve and a provided between the pressure source and the separating valve magnetic switching valve, wherein a spring chamber of the separating valve is connected to the return, wherein the magnetic switching valve is a 2-way valve, which is arranged between the pressure source and the spring chamber of the separating valve, wherein the • isolation valve is a 2/2-way valve, provided for the adjustment of the passage position pressure pilot side permanently with the pressure q uelle is connected, and wherein between the spring chamber and the return at least one aperture device is provided.
  • the two 2/2-way valves on the one hand, a solenoid valve and on the other hand, a spring-pressure-controlled valve.
  • the isolation valve is not held in the passage position via the emergency-off solenoid valve, but via the pilot pressure derived from the delivery pressure of the pressure source.
  • the emergency stop solenoid valve In emergency stop the emergency stop solenoid valve is de-energized and switched to its passage position, so that the then acting parallel to the spring control pressure, the shut-off position of the separating valve adjusts and holds.
  • Said diaphragm means between the spring chamber and the return allows a permanent discharge of pressure medium, without jeopardizing the shut-off position of the separating valve.
  • the pilot pressure generation is arranged in a connection plate parallel to the emergency stop shutdown system. This means that both constant-pump systems and variable-displacement pump systems can always generate sufficient pressure in the pilot circuit without any additional secondary measures. Regardless of the mentioned emergency stop function, it is thus possible to deflect the spool valves of the working sections during an electrohydraulic control with internal pilot pressure generation. In this case, the hydraulic energy flow from the pump to the pressure supply connection P to the respective working port A or B and thus to the connected hydraulic consumer can be prevented by the emergency stop function; but not the flow of energy from the working port A or B to the tank or return T.
  • the invention is therefore the object of a control device of the type mentioned to further improve that increased safety during operation is achieved. This object is achieved by a control device having the features of patent claim 1 in its entirety.
  • the switching logic can then be extended to that extent
  • the system can also be used as a kind of OR element or OR function in the overall hydraulic system of mobile machines in order to realize a switch circuit with which different working sections can then be activated.
  • a hydraulically actuable working cylinder which can be switched off or disconnected from the pressure supply via an upstream pilot-pressure-operated control valve, provided that the emergency-off valve (pilot-control solenoid valve) actuates a corresponding point position at the point valve (3/2-way valve) then causes the hydraulic supply for another hydraulic working section directly manufactures, which may for example consist of hydraulically actuated support cylinders of a mobile crane or the like, which then ensure that in operation even under load of the control device of Mobile crane can never overturn.
  • the emergency-off valve pilot-control solenoid valve
  • connection "T1" instead of connection "A1", in particular constant-displacement systems can then optionally be switched between the internal working circuit of the respective working sections and the neutral circulation in the direction of the tank or return line T via the connection "T1".
  • the generally conventional neutral circulation is performed in constant-pump systems via a recirculation pressure in the terminal plate of the device and since this is depending on the valve design and / interpretation always biased on one side, depending on the spring preload usually between 9 and 16 bar this Spring preload in combination with the pump volume flow as power loss.
  • the switch valve or the OR member does not fulfill any control tasks, but should only be designed as a switching valve, the mentioned spring force can be accordingly dimensioned lower.
  • this logic can be the Reduce the loss line by a factor of 3 to 4 compared to conventional systems as described and combine it with the safety shutdown.
  • a further current regulator is provided on the pressure supply side to the pilot valves of the control valve, which contributes to low leaks are discharged via the emergency stop valve in the direction of control oil tank line Z of the pilot pressure control for the control valve and thus the pressure signal at the measuring port MS is not corrupted.
  • Fig. 1 relates to a section of an overall hydraulic circuit diagram with representations of individual hydraulic components, as they are customary for such schematics.
  • the hydraulic switching valves according to FIGS. 1 to 3 are explained only insofar as they are necessary for the explanation of the control device according to the invention.
  • AI utility oreastsssehl uss for another hydraulic consumer (not shown) another working section
  • connection point P of a conventional pressure supply source can in turn be supplied in the usual way with fluid presettable pressure from a constant or variable displacement pump (not shown).
  • a pump line 10 respectively on the input side of a circulation pressure compensator 12, a switch valve 14 and a pilot solenoid valve 16.
  • the respective valve means 12, 16 open into a return or tank line, the leads to the return or tank connection T.
  • the outlet side of the valve 14 also opens into the return or tank line.
  • the circulating pressure compensator 12 is connected with its two opposing control sides to control lines which are supplied via the pump line 10, wherein viewed in the direction of FIG. 1, the upper control line is connected via an aperture or throttle 20 to the pump line 10.
  • the circulation pressure compensator 12 is spring-assisted in its closed or locked position shown in FIG. 1 held in the uncontrolled state. If in the circuit diagram rectangular boxes are shown, which are penetrated by a fluid line or Fluids passing point, there are so-called empty or placeholder, which can be equipped, if necessary, with other hydraulic components.
  • the switch valve 14 Seen in the direction of view of Fig. 1 and correspondingly downstream hydraulically, the switch valve 14 is provided, which is designed as a 3/2-way switching valve and the understanding of the switching logic ago forms a kind of "OR-member.”
  • the switch valve 14 In the in FIG. 1 shown spring-loaded Basic position, the switch valve 14 establishes a fluid-conducting connection between the pump line 10 and the port A1.
  • the two opposite control lines for the switch valve 14 are in turn connected to the pump line 10, wherein viewed in the direction of the Fig. 1 in the lower control line, a shutter or throttle 22 is connected.
  • pilot solenoid valve 16 which is shown spring loaded in its illustrated locked or normally closed position Pumping line 10 and the return line or tank line 18.
  • a protective filter 24 and a current regulator 26 are connected between the two input sides of the valves 14, 16. Between protective filter 24 and current regulator 26, a connection point MP emerges from the pump line 10
  • a block 32 which comprises the essential components of the emergency stop switch-off device, consisting in particular of the switch valve 14, the pilot control solenoid valve 16 and the protective filter, is again shown in dash-dotted lines within said control block 30 24 and the St rome controller 26.
  • pilot pressure supplied control valve 34 which is shown in Fig. 1 in its locked valve spool position with an input-side connection point, via a shuttle valve 36 to the load-sensing Line LS is connected. If the valve spool arrives When the control valve 34 is in its lower switching position, as seen in the direction of FIG. 1, the supply or pump pressure in the pump line 10 is supplied via the supply line 38 connected to the point valve 14 on the discharge side, and the control valve 34 on the output side of the control valve 34 to the user port A passed, whereas the user port B is connected via the control valve 34 in this switching position to the return or tank port T. If the spool of the valve 34 reaches its upper position shown in FIG.
  • the service port B is supplied with the pump pressure and the service port A is switched to return or tank T.
  • the spring-loaded control valve spool of the valve 34 are two pilot valves 40, each having its own control on the control lines Z, C, of which, for simplicity, but the fluid guide is shown only for a pilot valve 40 by the control line Z to the one pilot valve leads and the other control line C to the other pilot valve 40th
  • control line Z for the respective pilot valve 40 also opens a connecting line 42, in which a further terer current regulator 44 is preferably connected in the form of a valve, wherein the connecting line 42 is connected at a branch point 46 to the supply line 38.
  • control line Z is permanently connected to the pressure-supplying pump line 10 via a pressure-limiting valve 48 and via the diaphragm or throttle 20 in a fluid-conducting manner.
  • a filter device 50 together with a further pressure regulating valve 52 serves for the internal pilot pressure generation for the pilot valves 40 in the context of the electrohydraulic slide control for the individual working sections.
  • the further pressure regulating valve 52 is connected on the output side to the further control line C.
  • the control lines Z, C are connected at the output of the control block 30 into corresponding connection points Z, C. posed.
  • the load-sensing line LS is shown on the output side at block 30 in the connection point LS ausmündend.
  • the supply line 38 is shown merging into a flow control valve 54, which from a load
  • Sensing pressure of the control valve 34 is driven. Furthermore, the supply line 38, viewed in the direction of view of FIG. 1, opens at its lower end into a measuring connection MS, to which a pressure transducer 56 can be connected.
  • a non-illustrated hydraulic working cylinder with its two fluid or working spaces should be connected to the connection points A, B to form a first hydraulic working section, the Häzylin- the crane or lifting arm of a mobile crane to drive.
  • A1 another hydraulic working section is connected, which in turn supplies hydraulic support cylinder, which, when extended, stabilize the platform of the mobile crane, so that it can not fall over or buckle on one side during operation.
  • the mentioned use of the control device is only an example; other obvious application possibilities are conceivable.
  • each assignable pilot valve 40 resulting in a corresponding deflection of the spool of the Control valve 34 leads and the connection points A or B of the first hydraulic working section are supplied with fluid presettable pressure for operating the same.
  • the switch valve 14 is spring actuated in its position shown in Fig. 1 and then it follows exclusively a fluid supply under pressure via the pump line 10 in the direction of the connection point A1 with the other hydraulic working section.
  • the support cylinder for the platform of the mobile crane are supplied accordingly, which serves the safety, since they can then perform their support function.
  • the supply line 38 is shut off from the pressure supply, which means that the respective pilot valve 40 is no longer actuated and therefore the valve spool of the control valve 34 spring-assisted enters its blocking basic position as shown in FIG. 1 and thus with certainty prevents the fluid supply for the first hydraulic working section with the supply via the respective utility ports A or B.
  • pilot solenoid valve 16 instead of the solenoid valve 16 as shown in FIG. 1, which is normally closed (normally closed), also optionally, if necessary, another pilot solenoid valve can be used, which is normally open in the normal position (normally open) and actuated in its closed blocking position arrives.
  • Pilot valve 16 can then be decided which position the emergency stop valve 14 should have energized or energized and which circuit with the hydraulic working sections (A, B, A1) is activated.
  • the arrangement with the protective filter 24 and the hydraulically connected current regulator 26 as a diaphragm device, the respective pilot solenoid valve 16 can be safely protected from dirt entry, which helps to reduce the potential risk of failure of the required safety function significantly.
  • the measuring connection MS makes it possible to monitor the pending pressure between the valve 14 and the actuated working sections and thus the switching position of the emergency stop valve 14.
  • the further current regulator 44 then contributes to the fact that any small amounts of leakage can be discharged via the emergency-off valve 14 in the direction of the control oil tank line via the control line Z and thus the pressure signal at the measuring connection MS is not falsified.
  • Fig. 2 are for improved representation of the relationships of the control block 30 in the direction of the left of the control valve 34 again. The statements made so far also apply insofar for the hydraulic components according to FIG. 2.
  • FIG. 3 again corresponds to the illustration according to FIG. 2, with the proviso that the Pl-pressure sensor 56 is not shown at the measuring connection MS, and instead of the connection A1 for a further hydraulic working section, the corresponding connection point labeled T1 has been modified.
  • This is generally the usual neutral circulation in the aforementioned constant-displacement pump systems via the already described circulation pressure compensator 12, which, as shown, is always spring-loaded on one side and, depending on the spring preload, generally between 9 and 16 bar, this results in a loss of power in combination with the pump volume flow.
  • the point valve 14 in the form of the OR member does not have to fulfill any control tasks, but only needs to be executed as a simple switching valve, the spring force for the circulation pressure compensator 12 can accordingly be dimensioned lower. In this way, the power loss can be reduced by a factor of 3 to 4 compared to conventional systems and combined with the safety circuit.

Abstract

A control device is disclosed for at least one hydraulic working section (A, B), which can be connected to a pressure supply source (P) and a return flow (T) via a hydraulic supply circuit and a control valve (34) supplied with a pilot pressure, the device comprising an emergency shutdown system (32) having a pilot solenoid valve (16) and an additional valve (14). Said control device is characterised in that both the hydraulic energy flow from the pressure supply source (P) to at least one of the respective working sections (A, B) and the pilot pressure supply to the control valve (34) can be suppressed by means of the pilot solenoid valve (16) via the additional valve (14).

Description

Steuervorrichtung  control device
Die Erfindung betrifft eine Steuervorrichtung für mindestens eine hydraulische Arbeitssektion, die über einen hydraulischen Versorgungskreis und ein pilotdruckversorgtes Steuerventil mit einer Druckversorgungsquelle und einem Rücklauf verbindbar ist, mit einer Not-Aus-Abschalteinrichtung, die ein Vorsteuer-Magnetventil sowie ein weiteres Ventil aufweist. The invention relates to a control device for at least one hydraulic working section, which is connectable via a hydraulic supply circuit and a pilot pressure-supplied control valve to a pressure supply source and a return, with an emergency stop device comprising a pilot solenoid valve and another valve.
Durch die EP 1 686 268 B1 ist eine gattungsgemäße hydraulische Steuervorrichtung für wenigstens einen Hydroverbraucher bekannt, dessen wenigstens eine Arbeitsleitung über ein Wegesteuerventil mit einer Druckquel- le und einem Rücklauf verbindbar ist, mit einem Lastdruck-Steuerkreis und mit einem Not-Aus-Abschaltsystem, das zwischen der Druckquelle und einer zum Wegesteuerventil führenden Versorgungsleitung ein zumindest zu einer Durchgangsstellung druckvorgesteuertes, zur Sperrstellung federbeaufschlagtes Trennventil sowie ein zwischen der Druckquelle und dem Trennventil vorgesehenes Magnetschaltventil aufweist, wobei eine Federkammer des Trennventils an den Rücklauf angeschlossen ist, wobei das Magnetschaltventil ein 2/2-Wegeventil ist, welches zwischen der Druckquelle und der Federkammer des Trennventils angeordnet ist, wobei das • Trennventil ein 2/2-Wegeventil ist, dessen für die Einstellung der Durch- gangsstellung vorgesehene Druckvorsteuerseite permanent mit der Druckquelle verbunden ist, und wobei zwischen der Federkammer und dem Rücklauf wenigstens eine Blendeneinrichtung vorgesehen ist. Bei der bekannten Lösung sind die beiden 2/2-Wegeventile zum einen ein Magnetventil sowie zum anderen ein gegen Federkraft druckvorgesteuertes Ventil. Im Normalbetrieb wird bei der bekannten Lösung das Trennventil nicht über das Not-Aus-Magnetschaltventil in der Durchgangsstellung gehalten, sondern über den vom Förderdruck der Druckquelle abgeleiteten Vorsteuerdruck. Bei Not-Aus wird das Not-Aus-Magnetschaltventil entregt und in seine Durchgangsstellung geschaltet, so dass der dann parallel zur Feder wirkende Steuerdruck die Absperrstellung des Trennventils einstellt und hält. Die genannte Blendeneinrichtung zwischen der Federkammer und dem Rücklauf ermöglicht einen permanenten Abfluss von Druckmittel, ohne die Absperrstellung des Trennventils zu gefährden. A generic hydraulic control device for at least one hydraulic consumer is known from EP 1 686 268 B1, whose at least one working line can be connected to a pressure source and a return via a directional control valve, with a load pressure control circuit and with an emergency stop system, the supply line leading to the directional control valve at least one passage position druckvorgesteuertes, spring-loaded to the blocking position separating valve and a provided between the pressure source and the separating valve magnetic switching valve, wherein a spring chamber of the separating valve is connected to the return, wherein the magnetic switching valve is a 2-way valve, which is arranged between the pressure source and the spring chamber of the separating valve, wherein the • isolation valve is a 2/2-way valve, provided for the adjustment of the passage position pressure pilot side permanently with the pressure q uelle is connected, and wherein between the spring chamber and the return at least one aperture device is provided. In the known solution, the two 2/2-way valves on the one hand, a solenoid valve and on the other hand, a spring-pressure-controlled valve. In normal operation, in the known solution, the isolation valve is not held in the passage position via the emergency-off solenoid valve, but via the pilot pressure derived from the delivery pressure of the pressure source. In emergency stop the emergency stop solenoid valve is de-energized and switched to its passage position, so that the then acting parallel to the spring control pressure, the shut-off position of the separating valve adjusts and holds. Said diaphragm means between the spring chamber and the return allows a permanent discharge of pressure medium, without jeopardizing the shut-off position of the separating valve.
Bei der bekannten Lösung ist die Vorsteuerdruckerzeugung in eine An- schlussplatte parallel zum Not-Aus-Abschaltsystem angeordnet. Das bedeutet, dass sowohl bei Konstant-Pumpensystemen als auch Verstellpumpen- Systemen ohne weitere Sekundärmaßnahmen immer genügend Druck im Vorsteuerkreis erzeugt werden kann. Unabhängig von der angesprochenen Not-Aus-Funktion ist es somit möglich, die Steuerschieber der Arbeitssekti- onen bei einer elektrohydraulischen Ansteuerung mit interner Pilotdruckerzeugung auszulenken. Dabei kann zwar durch die Not-Aus-Funktion der hydraulische Energiefluss von der Pumpe mit dem Druckversorgungsan- schluss P zum jeweiligen Arbeitsanschluss A oder B und somit zum angeschlossenen hydraulischen Verbraucher verhindert werden; nicht aber der Energiefluss vom Arbeitsanschluss A oder B zum Tank oder Rücklauf T. Da in der Praxis nicht selten drückende oder ziehende Lasten an den Arbeitsanschlüssen der Steuerblöcke mobiler Arbeitsmaschinen vorliegen und sich somit auf dem Steuerschieber abstützen, kann es trotz der Not-Aus-Funktion im Pumpenzulauf zu ungewollten Bewegungen an den Verbrauchern kommen, was ein Sicherheitsrisiko darstellt. Ausgehend von diesem Stand der Technik liegt daher der Erfindung die Aufgabe zugrunde, eine Steuervorrichtung der genannten Art dahingehend weiter zu verbessern, dass eine erhöhte Sicherheit im Betrieb erreicht ist. Eine dahingehende Aufgabe löst eine Steuervorrichtung mit den Merkmalen des Patentanspruchs 1 in seiner Gesamtheit. In the known solution, the pilot pressure generation is arranged in a connection plate parallel to the emergency stop shutdown system. This means that both constant-pump systems and variable-displacement pump systems can always generate sufficient pressure in the pilot circuit without any additional secondary measures. Regardless of the mentioned emergency stop function, it is thus possible to deflect the spool valves of the working sections during an electrohydraulic control with internal pilot pressure generation. In this case, the hydraulic energy flow from the pump to the pressure supply connection P to the respective working port A or B and thus to the connected hydraulic consumer can be prevented by the emergency stop function; but not the flow of energy from the working port A or B to the tank or return T. Since in practice not often pushing or pulling loads on the working ports of the blocks of mobile machines are present and thus supported on the spool, it can despite the emergency stop function In the pump inlet to unwanted movements at the consumers come, which represents a security risk. Based on this prior art, the invention is therefore the object of a control device of the type mentioned to further improve that increased safety during operation is achieved. This object is achieved by a control device having the features of patent claim 1 in its entirety.
Dadurch, dass gemäß dem kennzeichnenden Teil des Patentanspruchs 1 mittels des Vorsteuer-Magnetventils sowohl der hydraulische Energiefluss von der Druckversorgungsquelle zu mindestens einer der jeweiligen Ar- beitssektionen als auch die Pilotdruckversorgung zu dem Steuerventil über das weitere Ventil unterbindbar ist, ist auch im Falle von drückenden oder ziehenden Lasten an den Arbeitsanschlüssen der Steuerblöcke erreicht, dass es bei Betätigen der Not-Aus-Funktion nicht noch zu ungewollten Bewegungen an den Verbrauchern kommen kann. Characterized in that according to the characterizing part of claim 1 by means of the pilot solenoid valve both the hydraulic energy flow from the pressure supply source to at least one of the respective working sections and the pilot pressure supply to the control valve via the further valve can be prevented, is also in the case of oppressive or pulling loads at the working connections of the control blocks achieved that it can not come to unwanted movements on the consumers when pressing the emergency stop function.
Durch den Einsatz eines Weichenventils, vorzugsweise in Form eines 3/2- Wegeventils, als weiteres Ventil der Not-Aus-Abschalteinrichtung anstelle eines„unidirektional" wirkenden 2/2-Wegeventils nach der vorstehend beschriebenen bekannten Lösung kann die Schaltlogik dann dahingehend er- weitet! werden, dass man das System gleichzeitig auch als eine Art Oder- Glied oder Oder-Funktion im Gesamt-Hydrauliksystem von mobilen Arbeitsmaschinen einsetzen kann, um dergestalt eine Weichenschaltung zu realisieren, mit der sich verschiedene Arbeitssektionen dann ansteuern lassen. By using a switch valve, preferably in the form of a 3/2-way valve, as a further valve of the emergency stop switch-off device instead of a "unidirectional" acting 2/2-way valve according to the known solution described above, the switching logic can then be extended to that extent At the same time, the system can also be used as a kind of OR element or OR function in the overall hydraulic system of mobile machines in order to realize a switch circuit with which different working sections can then be activated.
Mit Hilfe von unterschiedlichen 2/2-Wege-Vorsteuer-Magnetventilen (nor- mally open, normally closed) kann definiert werden, welche Stellung das Not-Aus-Ventil unbestromt und bestromt haben soll und welcher hydraulischer Versorgungskreis dabei aktiviert wird. Mit der Ausführung Anschluss„A1 " der Steuervorrichtung können zwei unterschiedliche Hydraulikkreise über das Oder-Glied wahlweise versorgt und sicherheitstechnisch vollständig entkoppelt betrieben werden. So lässt sich mit dieser Ausführung eine hydraulische Arbeitssektion mit einem hyd- raulischen Verbraucher ansteuern, beispielsweise in Form eines Kran- oder Hubarms mit einem hydraulisch betätigbaren Arbeitszylinders, der über ein vorgeschaltetes pilotdruckversorgtes Steuerventil von der Druckversorgung abschalt- oder abtrennbar ist, sofern das Not-Aus-Ventil (Vorsteuer- Magnetventil) betätigt eine entsprechende Weichenstellung beim Weichen- ventil (3/2-Wegeventil) veranlasst, das dann die hydraulische Versorgung für eine weitere hydraulische Arbeitssektion unmittelbar herstellt, die beispielsweise aus hydraulikbetätigbaren Abstützzylindern eines Mobilkrans oder dergleichen bestehen kann, die dann sicherstellen, dass im Betrieb auch unter Last der Steuervorrichtung der Mobilkran in keinem Fall umstür- zen kann. With the aid of different 2/2-way pilot solenoid valves (normally open, normally closed) it is possible to define which position the emergency stop valve should have energized and energized, and which hydraulic supply circuit is activated. With the embodiment "A1" of the control device, two different hydraulic circuits can be selectively supplied via the OR element and can be operated completely decoupled from a safety point of view: With this embodiment, a hydraulic working section with a hydraulic consumer can be actuated, for example in the form of a crane. or lifting arm with a hydraulically actuable working cylinder which can be switched off or disconnected from the pressure supply via an upstream pilot-pressure-operated control valve, provided that the emergency-off valve (pilot-control solenoid valve) actuates a corresponding point position at the point valve (3/2-way valve) then causes the hydraulic supply for another hydraulic working section directly manufactures, which may for example consist of hydraulically actuated support cylinders of a mobile crane or the like, which then ensure that in operation even under load of the control device of Mobile crane can never overturn.
Bei der zweiten alternativen Ausführung Anschluss„T1 " anstelle Anschluss „A1 " können dann insbesondere Konstantpumpen-Systeme wahlweise zwischen dem internen Arbeitskreis der jeweiligen Arbeitssektionen und dem Neutralumlauf Richtung Tank oder Rücklauf T über den Anschluss„T1 " geschaltet werden. In the second alternative embodiment, connection "T1" instead of connection "A1", in particular constant-displacement systems can then optionally be switched between the internal working circuit of the respective working sections and the neutral circulation in the direction of the tank or return line T via the connection "T1".
Vorzugsweise wird der allgemein übliche Neutralumlauf bei Konstantpumpen-Systemen über eine Umlaufdruckwaage in der Anschlussplatte der Vor- richtung geführt und da diese je nach Ventilkonstruktion und /-auslegung immer einseitig federbelastet ist, stellt sich je nach Federvorspannung in der Regel zwischen 9 und 16 bar diese Federvorspannung in Kombination mit dem Pumpenvolumenstrom als Verlustleistung dar. Da das Weichenventil respektive das Oder-Glied keine Regelaufgaben erfüllt, sondern nur als Schaltventil ausgeführt sein soll, kann die angesprochene Federkraft demgemäß niedriger dimensioniert werden. Mit Hilfe dieser Logik lässt sich die Verlustleitung um den Faktor 3 bis 4 gegenüber herkömmlichen Systemen, wie beschrieben, reduzieren und mit der Sicherheitsabschaltung kombinieren. Vorzugsweise ist bei der erfindungsgemäßen Lösung weiter vorgesehen, dass durch eine Anordnung der Vorrichtungskomponenten mit einem Schutzfilter als erstes Glied in einer Kette vor dem Vorsteuer-Magnetventil sowohl dieses als auch gegebenenfalls eine nachgeschaltete Blendenvorrichtung, vorzugsweise in Form eines Stromreglers, gleichermaßen vor Schmutzeintrag geschützt werden, was das mögliche Ausfallrisiko der Sicherheitsfunktionen deutlich verringern hilft. Preferably, the generally conventional neutral circulation is performed in constant-pump systems via a recirculation pressure in the terminal plate of the device and since this is depending on the valve design and / interpretation always biased on one side, depending on the spring preload usually between 9 and 16 bar this Spring preload in combination with the pump volume flow as power loss. Since the switch valve or the OR member does not fulfill any control tasks, but should only be designed as a switching valve, the mentioned spring force can be accordingly dimensioned lower. With the help of this logic can be the Reduce the loss line by a factor of 3 to 4 compared to conventional systems as described and combine it with the safety shutdown. Preferably, it is further provided in the inventive solution that by an arrangement of the device components with a protective filter as the first link in a chain in front of the pilot solenoid valve both this and optionally a downstream aperture device, preferably in the form of a current regulator, are equally protected from dirt entry, which helps to significantly reduce the potential risk of failure of the safety functions.
Ferner ist vorzugsweise vorgesehen, dass nach dem Not-Aus-Abschaltventil durch einen in den hydraulischen Kreis geschalteten Messanschluss MS die Möglichkeit bestehen soll, den Druck zwischen dem Not-Aus-Ventil respektive dem Vorsteuer-Magnetventil und den jeweiligen Arbeitssektionen und somit die Schaltstel lung des Not-Aus-Ventils zu überwachen. Vorzugsweise ist dabei ein weiterer Stromregler auf der Druckversorgungsseite zu den Pilotventilen des Steuerventils vorgesehen, der dazu beiträgt, dass geringe Leckagen über das Not-Aus- Ventil in Richtung Steueröl-Tankleitung Z der Pilotdruckansteuerung für das Steuerventil abgeführt werden und somit das Drucksignal an dem Messanschluss MS nicht verfälscht wird. Further, it is preferably provided that after the emergency stop shut-off valve by a switched into the hydraulic circuit measuring port MS should be the possibility of the pressure between the emergency stop valve respectively the pilot solenoid valve and the respective working sections and thus the switching Stel development monitor the emergency stop valve. Preferably, a further current regulator is provided on the pressure supply side to the pilot valves of the control valve, which contributes to low leaks are discharged via the emergency stop valve in the direction of control oil tank line Z of the pilot pressure control for the control valve and thus the pressure signal at the measuring port MS is not corrupted.
Weitere vorteilhafte Ausführungsformen der erfindungsgemäßen Steuervor- richtungslösung sind Gegenstand der Unteransprüche. Further advantageous embodiments of the invention Steuervor- tion solution are the subject of the dependent claims.
Im Folgenden wird die erfindungsgemäße Steuervorrichtung anhand von Ausführungsbeispielen nach der Zeichnung näher erläutert. Dabei zeigen in prinzipieller Darstellung die Fig. 1 in der Art eines hydraulischen Schaltplans die wesentlichen Komponenten der Steuervorrichtung und die In the following, the control device according to the invention will be explained in more detail with reference to embodiments of the drawing. This show in a schematic representation of the Fig. 1 in the manner of a hydraulic circuit diagram, the essential components of the control device and the
Fig. 2 und 3 geänderte Ausführungsformen für die Schaltplandar- Stellung nach der Fig. 1 . 2 and 3 modified embodiments for the Schaltplandar- position of FIG .. 1
Die Fig. 1 betrifft einen Ausschnitt aus einem hydraulischen Gesamt- Schaltplan mit Darstellungen von einzelnen hydraulischen Komponenten, wie sie für solche Schaltplandarstellungen üblich sind. Im Folgenden werden die hydraulischen Schaltventile nach den Fig. 1 bis 3 jedoch nur insofern erläutert, als sie für die Erklärung der erfindungsgemäßen Steuervorrichtung notwendig sind. Die in den Figuren verwendeten Buchstaben, so- fern sie zur Erläuterung der Erfindung notwendig sind, bedeuten dabei folgendes: Fig. 1 relates to a section of an overall hydraulic circuit diagram with representations of individual hydraulic components, as they are customary for such schematics. In the following, however, the hydraulic switching valves according to FIGS. 1 to 3 are explained only insofar as they are necessary for the explanation of the control device according to the invention. The letters used in the figures, insofar as they are necessary for explaining the invention, mean the following:
P Druckversorgungsquellen-Anschluss  P Pressure source connection
T Rücklauf- oder Tank-Anschluss,  T return or tank connection,
LS Load-Sensing-Leitung,  LS load-sensing cable,
LX Load-Sensing-Steuerleitung, LX load-sensing control line,
A, B Nutz- oder Versorgungsanschlüsse für einen hydraulischen  A, B utility or supply connections for a hydraulic
Verbraucher (nicht dargestellt) einer Arbeitssektion,  Consumer (not shown) of a working section,
AI Nutz- oder Versorgungsansehl uss für einen weiteren hydraulischen Verbraucher (nicht dargestellt) einer weiteren Arbeits- Sektion,  AI utility or Versorgungsssehl uss for another hydraulic consumer (not shown) another working section,
T1 Anschluss für einen Neutralumlauf Richtung Tank oder Rücklauf T,  T1 connection for a neutral circulation in the direction of tank or return T,
MS Messanschluss für einen Druckwertaufnehmer PI,  MS measuring connection for a pressure transducer PI,
Z, C Steuerleitungen für eine Vorsteuerdruckerzeugung für Pilot- ventile eines Steuerventils,  Z, C control lines for pilot pressure generation for pilot valves of a control valve,
MP, MY, PC weitere hydraulische Anschlussstellen. Die zugehörige Anschlussstelle P einer üblichen Druckversorgungsquelle lässt sich wiederum in üblicher weise mit Fluid vorgebbaren Drucks von einer Konstant- oder Verstellpumpe (nicht dargestellt) versorgen. Ausgehend von der Anschlussstelle P mit der Druckversorgungsquelle endet eine Pumpenleitung 10 jeweils auf der Eingangsseite einer Umlaufdruckwaage 12, eines Weichenventils 14 sowie eines Vorsteuer-Magnetventiles 16. Auf der Ausgangsseite der jeweiligen Ventileinrichtung 12, 16 münden diese in eine Rücklauf- oder Tankleitung ein, die zum Rücklauf- oder Tankanschluss T führt. Bei der Ausführungsform nach der Fig. 3, also bei der Ausführung T1 , mündet auch die Ausgangsseite des Ventils 14 in die Rücklauf- oder Tankleitung ein. Sofern in den Figuren die Leitungen strichliniert wiedergegeben sind, soll dies verdeutlichen, dass sie zum Ansteuern von entsprechend angeschlossenen hydraulischen Komponenten dienen. MP, MY, PC more hydraulic connection points. The associated connection point P of a conventional pressure supply source can in turn be supplied in the usual way with fluid presettable pressure from a constant or variable displacement pump (not shown). Starting from the connection point P with the pressure supply source ends a pump line 10 respectively on the input side of a circulation pressure compensator 12, a switch valve 14 and a pilot solenoid valve 16. On the output side of the respective valve means 12, 16 open into a return or tank line, the leads to the return or tank connection T. In the embodiment according to FIG. 3, that is to say in the embodiment T1, the outlet side of the valve 14 also opens into the return or tank line. If the lines are shown in dashed lines in the figures, this should make it clear that they serve to control appropriately connected hydraulic components.
Die Umlaufdruckwaage 12 ist mit ihren beiden einander gegenüberliegenden Steuerseiten an Steuerleitungen angeschlossen, die über die Pumpenleitung 10 versorgt sind, wobei in Blickrichtung auf die Fig. 1 gesehen die obere Steuerleitung über eine Blende oder Drossel 20 an die Pumpenlei- tung 10 angeschlossen ist. Im Übrigen wird die Umlaufdruckwaage 12 federunterstützt in ihrer in der Fig. 1 gezeigten Schließ- oder Sperrstellung im unangesteuerten Zustand gehalten. Sofern in der Schaltplandarstellung rechteckförmige Kästchen gezeigt sind, die von einer Fluidleitung oder Flu- iddurchgangsstelle durchgriffen sind, handelt es sich um sogenannte Leer- oder Platzhalter, die im Bedarfsfall mit weiteren hydraulischen Komponenten bestückbar sind. The circulating pressure compensator 12 is connected with its two opposing control sides to control lines which are supplied via the pump line 10, wherein viewed in the direction of FIG. 1, the upper control line is connected via an aperture or throttle 20 to the pump line 10. Incidentally, the circulation pressure compensator 12 is spring-assisted in its closed or locked position shown in FIG. 1 held in the uncontrolled state. If in the circuit diagram rectangular boxes are shown, which are penetrated by a fluid line or Fluids passing point, there are so-called empty or placeholder, which can be equipped, if necessary, with other hydraulic components.
In Blickrichtung auf die Fig. 1 gesehen und entsprechend hydraulisch nachgeschaltet ist das Weichenventil 14 vorhanden, das als 3/2-Wege- Schaltventil konzipiert ist und vom Verständnis der Schaltlogik her eine Art „Oder-Glied" ausbildet. In der in der Fig. 1 gezeigten federbelasteten Grundstellung stellt das Weichenventil 14 eine fluidführende Verbindung zwischen der Pumpenleitung 10 und dem Anschluss A1 her. Die beiden gegenüberliegenden Steuerleitungen für das Weichenventil 14 sind wiederum an die Pumpenleitung 10 angeschlossen, wobei in Blickrichtung auf die Fig. 1 gesehen in die untere Steuerleitung eine Blende oder Drossel 22 geschaltet ist. Wird das Weichenventil 14 fluidangesteuert betätigt, wird entgegen der Wirkung der Federkraft eine fluidführende Verbindung zwischen der druckführenden Pumpenleitung 10 in Richtung der Anschlussstellen A oder B hergestellt, was im Folgenden noch näher erläutert werden wird. Seen in the direction of view of Fig. 1 and correspondingly downstream hydraulically, the switch valve 14 is provided, which is designed as a 3/2-way switching valve and the understanding of the switching logic ago forms a kind of "OR-member." In the in FIG. 1 shown spring-loaded Basic position, the switch valve 14 establishes a fluid-conducting connection between the pump line 10 and the port A1. The two opposite control lines for the switch valve 14 are in turn connected to the pump line 10, wherein viewed in the direction of the Fig. 1 in the lower control line, a shutter or throttle 22 is connected. If the switch valve 14 is actuated in a fluid-controlled manner, a fluid-conducting connection between the pressure-carrying pump line 10 in the direction of the connection points A or B is produced against the action of the spring force, which will be explained in more detail below.
Wiederum in Übereinanderanordnung und hydraulisch nachgeschaltet, ist das Vorsteuer-Magnetventil 16 vorgesehen, das federbelastet in seiner gezeigten Sperrstellung oder„normally closed"-Stellung gezeigt ist. Wird das Ventil 16 magnetbetätigt geschaltet, gelangt es in seine geöffnete Stellung und stellt eine Fluidverbindung zwischen der Pumpenleitung 10 und der Rücklauf- oder Tankleitung 18 her. Zwischen den beiden Eingangsseiten der Ventile 14, 16 ist ein Schutzfilter 24 sowie ein Stromregler 26 geschaltet. Zwischen Schutzfilter 24 und Stromregler 26 mündet von der Pumpen- leitung 10 aus gesehen eine Anschlussstelle MP aus dem strichpunkiert dargestellten Steuerblock 30 der Steuervorrichtung aus. Innerhalb des genannten Steuerblocks 30 ist wiederum strichpunktiert ein Block 32 dargestellt, der die wesentlichen Komponenten der Not-Aus-Abschalteinrichtung um- fasst, bestehend insbesondere aus dem Weichenventil 14, dem Vorsteuer- Magnetventil 16 sowie dem Schutzfilter 24 und dem Stromregler 26. Again in superposition and hydraulically downstream, there is provided the pilot solenoid valve 16, which is shown spring loaded in its illustrated locked or normally closed position Pumping line 10 and the return line or tank line 18. A protective filter 24 and a current regulator 26 are connected between the two input sides of the valves 14, 16. Between protective filter 24 and current regulator 26, a connection point MP emerges from the pump line 10 A block 32, which comprises the essential components of the emergency stop switch-off device, consisting in particular of the switch valve 14, the pilot control solenoid valve 16 and the protective filter, is again shown in dash-dotted lines within said control block 30 24 and the St rome controller 26.
Für die Ansteuerung der beiden Anschlüsse A, B dient ein übliches und daher nicht mehr näher beschriebenes pilotdruckversorgtes Steuerventil 34, das in der Fig. 1 in seiner gesperrten Ventilschieberstellung gezeigt ist mit einer eingangsseitigen Anschlussstelle, die über ein Wechselventil 36 an die Load-Sensing-Leitung LS angeschlossen ist. Gelangt der Ventilschieber des Steuerventils 34 in seine in Blickrichtung auf die Fig. 1 gesehen untere Schaltposition, wird bei entsprechend betätigtem Weichenventil 14 der Versorgungs- oder Pumpendruck in der Pumpenleitung 10 über die abgabe- seitig an das Weichenventil 14 angeschlossene Versorgungsleitung 38 so- wie das Steuerventil 34 ausgangsseitig des Steuerventils 34 an den Nutzan- schluss A weitergegeben, wohingegen der Nutzanschluss B über das Steuerventil 34 in dieser Schaltstellung an den Rücklauf oder Tankanschluss T angeschlossen ist. Gelangt der Steuerschieber des Ventils 34 in seine in der Fig. 1 gezeigte obere Stellung, wird der Nutzanschluss B mit dem Pumpen- druck versorgt und der Nutzanschluss A wird auf Rücklauf oder Tank T geschaltet. Zum Ansteuern des federbelasteten Steuerventilschiebers des Ventils 34 dienen zwei Pilotventile 40, die jeweils über eine eigenständige An- steuerung über die Steuerleitungen Z, C verfügen, von denen der Einfachheit halber aber die Fluidführung nur für ein Pilotventil 40 dargestellt ist, indem die Steuerleitung Z zu dem einen Pilotventil führt und die weitere Steuerleitung C zu dem anderen Pilotventil 40. For the control of the two ports A, B is a conventional and therefore not described in more detail pilot pressure supplied control valve 34, which is shown in Fig. 1 in its locked valve spool position with an input-side connection point, via a shuttle valve 36 to the load-sensing Line LS is connected. If the valve spool arrives When the control valve 34 is in its lower switching position, as seen in the direction of FIG. 1, the supply or pump pressure in the pump line 10 is supplied via the supply line 38 connected to the point valve 14 on the discharge side, and the control valve 34 on the output side of the control valve 34 to the user port A passed, whereas the user port B is connected via the control valve 34 in this switching position to the return or tank port T. If the spool of the valve 34 reaches its upper position shown in FIG. 1, the service port B is supplied with the pump pressure and the service port A is switched to return or tank T. To control the spring-loaded control valve spool of the valve 34 are two pilot valves 40, each having its own control on the control lines Z, C, of which, for simplicity, but the fluid guide is shown only for a pilot valve 40 by the control line Z to the one pilot valve leads and the other control line C to the other pilot valve 40th
In die Steueröl-Tankleitung der Steuerleitung Z für das jeweilige Pilotventil 40 mündet ebenfalls eine Anschlussleitung 42, in die vorzugsweise ein wei- terer Stromregler 44 in Form eines Ventils geschaltet ist, wobei die Anschlussleitung 42 an einer Abzweigstelle 46 mit der Versorgungsleitung 38 verbunden ist. Des Weiteren ist die Steuerleitung Z über ein Druckbegrenzungsventil 48 und über die Blende oder Drossel 20 permanent fluidfüh- rend an die druckversorgende Pumpenleitung 10 angeschlossen. Eine Fil- tereinrichtung 50 nebst einem weiteren Druckregel ventil 52 dient der internen Vorsteuerdruckerzeugung für die Pilotventile 40 im Rahmen der elekt- rohydraulischen Schieberbetätigung für die einzelnen Arbeitssektionen. Das weitere Druckregel ventil 52 ist dabei ausgangsseitig an die weitere Steuerleitung C angeschlossen. Die Steuerleitungen Z, C sind am Ausgang des Steuerblocks 30 in entsprechende Anschlussstellen Z, C einmündend dar- gestellt. Ebenso ist die Load-Sensing-Leitung LS ausgangsseitig am Block 30 in die Anschlussstelle LS ausmündend dargestellt. In the control oil tank line of the control line Z for the respective pilot valve 40 also opens a connecting line 42, in which a further terer current regulator 44 is preferably connected in the form of a valve, wherein the connecting line 42 is connected at a branch point 46 to the supply line 38. Furthermore, the control line Z is permanently connected to the pressure-supplying pump line 10 via a pressure-limiting valve 48 and via the diaphragm or throttle 20 in a fluid-conducting manner. A filter device 50 together with a further pressure regulating valve 52 serves for the internal pilot pressure generation for the pilot valves 40 in the context of the electrohydraulic slide control for the individual working sections. The further pressure regulating valve 52 is connected on the output side to the further control line C. The control lines Z, C are connected at the output of the control block 30 into corresponding connection points Z, C. posed. Likewise, the load-sensing line LS is shown on the output side at block 30 in the connection point LS ausmündend.
Auf der Eingangsseite des Steuerventils 34 ist die Versorgungsleitung 38 in ein Stromregelventil 54 einmündend dargestellt, das von einem Load-On the input side of the control valve 34, the supply line 38 is shown merging into a flow control valve 54, which from a load
Sensing-Druck des Steuerventils 34, wie dargestellt, angesteuert ist. Ferner mündet die Versorgungsleitung 38 in Blickrichtung auf die Fig. 1 gesehen an ihrem unteren Ende in einen Messanschluss MS aus, an den ein Pl- Druckwertaufnehmer 56 anschließbar ist. Sensing pressure of the control valve 34, as shown, is driven. Furthermore, the supply line 38, viewed in the direction of view of FIG. 1, opens at its lower end into a measuring connection MS, to which a pressure transducer 56 can be connected.
Bei dem gezeigten Ausführungsbeispiel nach der Fig. 1 soll an den Anschlussstellen A, B unter Bildung einer ersten hydraulischen Arbeitssektion ein nicht näher dargestellter hydraulischer Arbeitszylinder mit seinen beiden Fluid- oder Arbeitsräumen angeschlossen sein, wobei der Arbeitszylin- der den Kran- oder Hubarm eines Mobilkrans ansteuern soll. An die Anschlussstelle A1 ist eine weitere hydraulische Arbeitssektion angeschlossen, welche wiederum hydraulische Stützzylinder versorgt, die entsprechend ausgefahren die Plattform des Mobilkrans stabilisieren, damit dieser auch im Betrieb nicht umfallen oder an einer Seite einknicken kann. Die genann- te Verwendung der Steuervorrichtung ist nur beispielhaft; andere sinnfällige Einsatzmöglichkeiten sind denkbar. In the illustrated embodiment according to FIG. 1, a non-illustrated hydraulic working cylinder with its two fluid or working spaces should be connected to the connection points A, B to form a first hydraulic working section, the Arbeitszylin- the crane or lifting arm of a mobile crane to drive. At the junction A1 another hydraulic working section is connected, which in turn supplies hydraulic support cylinder, which, when extended, stabilize the platform of the mobile crane, so that it can not fall over or buckle on one side during operation. The mentioned use of the control device is only an example; other obvious application possibilities are conceivable.
Wird das Vorsteuerventil 16 betätigt, also in seine Fluid durchlassende Stellung gebracht, schaltet das Weichenventil 14 in seine untere Schaltstellung und versorgt dann mit Pumpendruck über die Pumpenleitung 10, wie bereits beschrieben, das jeweils zuordenbare Pilotventil 40, was zu einer entsprechenden Auslenkung des Steuerschiebers des Steuerventils 34 führt und die Anschlussstellen A oder B der ersten hydraulischen Arbeitssektion werden mit Fluid vorgebbaren Drucks zur Betätigung derselben versorgt. Wird nun das Vorsteuerventil 16 betätigt und gelangt in seine gezeigte, normalerweise geschlossene Stellung, wird das Weichenventil 14 federbetätigt in seine in Fig. 1 gezeigte Stellung gebracht und es folgt dann ausschließlich eine Fluidversorgung unter Druck über die Pumpenleitung 10 in Richtung der Anschlussstelle A1 mit der weiteren hydraulischen Arbeitssektion. Im aufgezeigten Anwendungsbeispiel mit dem Mobilkran werden dann die Stützzylinder für die Plattform des Mobilkrans entsprechend versorgt, was der Sicherheit dient, da diese dann ihre Stützfunktion wahrnehmen können. Andererseits ist dann die Versorgungsleitung 38 von der Druckversorgung her abgesperrt, was dazu führt, dass das jeweilige Pilotventil 40 nicht mehr angesteuert wird und mithin der Ventilschieber des Steuerventils 34 federunterstützt in seine sperrende Grundstellung gelangt gemäß der Darstellung nach der Fig. 1 und damit mit Sicherheit die Fluidversorgung für die erste hydraulische Arbeitssektion mit der Versorgung über die jeweiligen Nutzanschlüsse A oder B unterbindet. If the pilot valve 16 is actuated, ie brought into its fluid-passing position, switches the switch valve 14 in its lower switching position and then supplied with pump pressure via the pump line 10, as already described, each assignable pilot valve 40, resulting in a corresponding deflection of the spool of the Control valve 34 leads and the connection points A or B of the first hydraulic working section are supplied with fluid presettable pressure for operating the same. Now, if the pilot valve 16 is actuated and enters its shown, normally closed position, the switch valve 14 is spring actuated in its position shown in Fig. 1 and then it follows exclusively a fluid supply under pressure via the pump line 10 in the direction of the connection point A1 with the other hydraulic working section. In the application example shown with the mobile crane then the support cylinder for the platform of the mobile crane are supplied accordingly, which serves the safety, since they can then perform their support function. On the other hand, then the supply line 38 is shut off from the pressure supply, which means that the respective pilot valve 40 is no longer actuated and therefore the valve spool of the control valve 34 spring-assisted enters its blocking basic position as shown in FIG. 1 and thus with certainty prevents the fluid supply for the first hydraulic working section with the supply via the respective utility ports A or B.
Bei entsprechend betätigter Not-Aus-Funktion über die zugehörige Abschalteinrichtung 32 ist dann selbst bei ziehenden oder drückenden Lasten in der ersten Arbeitssektion mit Sicherheit die Versorgung derart unterbunden, dass der jeweils in der ersten Arbeitssektion angeschlossene hydrauli- sehe Verbraucher sich nicht mehr bewegen kann. Mit nur einem Magnetventil 16 kann also gleichzeitig der hydraulische Energiefluss von der Druckversorgung zu der jeweils ersten Arbeitssektion als auch die Pilotdruckversorgung der elektro-hydraulischen Steuerschieberansteuerung für das Steuerventil 34 unterbrochen werden, was so keine Entsprechung im Stand der Technik hat. With correspondingly actuated emergency stop function via the associated switch-off device 32, the supply is then prevented even with pulling or pushing loads in the first working section with certainty such that the hydraulic consumers connected in each case in the first working section can no longer move. Thus, with only one solenoid valve 16, the hydraulic energy flow from the pressure supply to the respective first working section as well as the pilot pressure supply of the electro-hydraulic spool control for the control valve 34 can be interrupted at the same time, which has no equivalent in the prior art.
Anstelle des Magnetventils 16 gemäß der Darstellung nach der Fig. 1 , das im Normalfall geschlossen ist (normally closed), kann auch optional im Bedarfsfall ein anderes Vorsteuer-Magnetventil eingesetzt werden, das in der Grundstellung normalerweise geöffnet ist (normally open) und betätigt in seine geschlossene Sperrstellung gelangt. Je nach Art des dann eingesetzten Vorsteuerventils 16 kann dann entschieden werden, welche Stellung das Not-Aus-Ventil 14 unbestromt oder bestromt haben soll und welcher Kreis mit den hydraulischen Arbeitssektionen (A, B, A1 ) aktiviert wird. Durch die Anordnung mit dem Schutzfilter 24 und dem hydraulisch nachgeschalteten Stromregler 26 als Blendenvorrichtung lässt sich das jeweilige Vorsteuer- Magnetventil 16 sicher vor Schmutzeintrag schützen, was das mögliche Ausfallrisiko der benötigten Sicherheitsfunktion wesentlich reduzieren hilft. Instead of the solenoid valve 16 as shown in FIG. 1, which is normally closed (normally closed), also optionally, if necessary, another pilot solenoid valve can be used, which is normally open in the normal position (normally open) and actuated in its closed blocking position arrives. Depending on the type of then used Pilot valve 16 can then be decided which position the emergency stop valve 14 should have energized or energized and which circuit with the hydraulic working sections (A, B, A1) is activated. The arrangement with the protective filter 24 and the hydraulically connected current regulator 26 as a diaphragm device, the respective pilot solenoid valve 16 can be safely protected from dirt entry, which helps to reduce the potential risk of failure of the required safety function significantly.
Auf der Ausgangsseite des Not-Aus-Abschaltventils in Form des Wechsel- ventils 36 besteht durch den Messanschluss MS die Möglichkeit, den anstehenden Druck zwischen dem Ventil 14 und den angesteuerten Arbeitssektionen und somit die Schaltstellung des Not-Aus- Ventils 14 zu überwachen. Der weitere Stromregler 44 trägt dann mit dazu bei, dass etwaig gering auftretende Leckagemengen über das Not-Aus-Ventil 14 in Richtung der Steu- eröl-Tankleitung über die Steuerleitung Z abgeführt werden können und somit das Drucksignal an dem Messanschluss MS nicht verfälscht wird. On the output side of the emergency stop shut-off valve in the form of the change-over valve 36, the measuring connection MS makes it possible to monitor the pending pressure between the valve 14 and the actuated working sections and thus the switching position of the emergency stop valve 14. The further current regulator 44 then contributes to the fact that any small amounts of leakage can be discharged via the emergency-off valve 14 in the direction of the control oil tank line via the control line Z and thus the pressure signal at the measuring connection MS is not falsified.
Die Fig. 2 gibt zur verbesserten Darstellung die Verhältnisse des Steuerblocks 30 in Blickrichtung links von dem Steuerventil 34 wieder. Die bisher getroffenen Ausführungen gelten auch insoweit für die hydraulischen Komponenten nach der Fig. 2. Fig. 2 are for improved representation of the relationships of the control block 30 in the direction of the left of the control valve 34 again. The statements made so far also apply insofar for the hydraulic components according to FIG. 2.
Die Fig. 3 entspricht wiederum der Darstellung nach der Fig. 2 mit der Maßgabe, dass an dem Messanschluss MS nicht der Pl-Druckwertaufnehmer 56 gezeigt ist und anstelle des Anschlusses A1 für eine weitere hydraulische Arbeitssektion ist die entsprechende Anschlussstelle mit der Bezeichnung T1 abgewandelt, was die Möglichkeit eröffnet, speziell für den Einsatz von Konstant-Pumpensystemen wahlweise zwischen dem internen Arbeitskreis der jeweiligen Arbeitssektion und dem Neutralumlauf in Richtung Rücklauf- oder Tankanschluss T über den Anschluss T1 gemäß der Darstellung nach der Fig. 3 zu wählen. Dabei erfolgt allgemein der übliche Neutralumlauf bei den genannten Konstantpumpensystemen über die bereits beschriebene Umlaufdruckwaage 12, die, wie dargestellt, immer einseitig federbelastet ist und je nach Federvorspannung, in der Regel zwischen 9 und 16 bar, ergibt sich hieraus in Kombination mit dem Pumpenvolumenstrom eine Verlust- leistung. Da das Weichenventil 14 in Form des Oder-Gliedes keine Regelaufgaben erfüllen muss, sondern nur als einfaches Schaltventil ausgeführt zu werden braucht, kann demgemäß die Federkraft für die Umlaufdruckwaage 12 niedriger dimensioniert werden. Dergestalt lässt sich die Verlustleistung um den Faktor 3 bis 4 gegenüber herkömmlichen Systemen redu- zieren und mit der Sicherheitsschaltung kombinieren. FIG. 3 again corresponds to the illustration according to FIG. 2, with the proviso that the Pl-pressure sensor 56 is not shown at the measuring connection MS, and instead of the connection A1 for a further hydraulic working section, the corresponding connection point labeled T1 has been modified. which opens the possibility, especially for the use of constant-pump systems optionally between the internal working of the respective working section and the neutral circulation in the direction of return or tank connection T via the terminal T1 as shown in FIG. 3 to choose. This is generally the usual neutral circulation in the aforementioned constant-displacement pump systems via the already described circulation pressure compensator 12, which, as shown, is always spring-loaded on one side and, depending on the spring preload, generally between 9 and 16 bar, this results in a loss of power in combination with the pump volume flow. Since the point valve 14 in the form of the OR member does not have to fulfill any control tasks, but only needs to be executed as a simple switching valve, the spring force for the circulation pressure compensator 12 can accordingly be dimensioned lower. In this way, the power loss can be reduced by a factor of 3 to 4 compared to conventional systems and combined with the safety circuit.

Claims

P a t e n t a n s p r ü c h e P a n t a n s p r e c h e
Steuervorrichtung für mindestens eine hydraulische Arbeitssektion (A, B), die über einen hydraulischen Versorgungskreis und ein pilotdruck- versorgtes Steuerventil (34) mit einer Druckversorgungsquelle (P) und einem Rücklauf (T) verbindbar ist, mit einer Not-Aus-Abschalteinrichtung (32), die ein Vorsteuer-Magnetventil (16) sowie ein weiteres Ventil (14) aufweist, dadurch gekennzeichnet, dass mittels des Vorsteuer-Magnetventils (16) sowohl der hydraulische Energiefluss von der Druckversorgungsquelle (P) zu mindestens einer der jeweiligen Arbeitssektionen (A, B) als auch die Pilotdruckversorgung zu dem Steuerventil (34) über das weitere Ventil (14) unterbindbar ist. Control device for at least one hydraulic working section (A, B), which is connectable to a pressure supply source (P) and a return (T) via a hydraulic supply circuit and a pilot pressure-supplied control valve (34), with an emergency stop switch-off device (32 ), which has a pilot solenoid valve (16) and a further valve (14), characterized in that by means of the pilot solenoid valve (16) both the hydraulic energy flow from the pressure supply source (P) to at least one of the respective working sections (A, B) and the pilot pressure supply to the control valve (34) via the further valve (14) can be prevented.
Steuervorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Not-Aus-Abschalteinrichtung (32) neben dem Vorsteuer-Magnetventil (1 6) als weiteres Ventil (14) über ein Weichenventil verfügt, das in der Art eines Oder-Gliedes in Abhängigkeit des Betätigungszustands des Vorsteuer-Magnetventils (16) die wahlweise Fluidversorgung mindestens der einen hydraulischen Arbeitssektion (A, B) und mindestens einer weiteren hydraulischen Arbeitssektion (A1 ; T1 ) ermöglicht. Control device according to claim 1, characterized in that the emergency-stop device (32) in addition to the pilot solenoid valve (1 6) as a further valve (14) via a switch valve, which in the manner of an OR member depending on the operating state the pilot solenoid valve (16) the optional fluid supply at least one hydraulic working section (A, B) and at least one further hydraulic working section (A1, T1) allows.
Steuervorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Weichenventil (14) ein 3/2-Wegeventil ist. Control device according to claim 1 or 2, characterized in that the switch valve (14) is a 3/2-way valve.
Steuervorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die jeweils weitere hydraulische Arbeitssektion über einen Anschluss (A1 ; T1 ) verfügt, der wahlweise einen weiteren zuordenbaren hydraulischen Verbraucher versorgt oder der einen Neutralumlauf in Richtung des Rücklaufs (T) ermöglicht. Steuervorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass in die Pumpenleitung (10) von der Druckversorgungsquelle (P) auf die Eingangsseite des Weichenventils (14) vor derselben eine Umlaufdruckwaage (12) geschaltet ist. Control device according to one of the preceding claims, characterized in that the respective further hydraulic working section has a connection (A1, T1) which optionally supplies another assignable hydraulic consumer or which allows a neutral circulation in the direction of the return (T). Control device according to one of the preceding claims, characterized in that in the pump line (10) from the pressure supply source (P) to the input side of the switch valve (14) in front of the same a circulation pressure compensator (12) is connected.
Steuervorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass von der Eingangsseite des Weichenventils (14) ausgehend das Vorsteuer-Magnetventil (16) nachgeschaltet ist, das als 2/2- Wegeventil ausgebildet optional in seiner Ausgangsstellung gesperrt oder fluiddurchgängig geschaltet ist. Control device according to one of the preceding claims, characterized in that starting from the input side of the switch valve (14), the pilot control solenoid valve (16) is connected, which is formed as a 2/2-way valve optionally blocked in its initial position or fluid-connected.
Steuervorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das zwischen der Eingangsseite des Weichenventils (14) und der Eingangsseite des Vorsteuer-Magnetventils (16) ein Strom regier (26) geschaltet ist. Control device according to one of the preceding claims, characterized in that a current regulator (26) is connected between the input side of the switch valve (14) and the input side of the pilot control solenoid valve (16).
Steuervorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der Eingangsseite des Weichenventils (14) und der Eingangsseite des Stromreglers (26) ein Schutzfilter (24) geschaltet ist. Control device according to one of the preceding claims, characterized in that between the input side of the switch valve (14) and the input side of the current regulator (26), a protective filter (24) is connected.
Steuervorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass auf der Ausgangsseite des Weichenventils (14) in Richtung der Druckversorgung für die mindestens eine hydraulische Arbeitssektion (A, B) vor der Eingangsseite des Steuerventils (34) ein Messanschluss (MS) geschaltet ist. Control device according to one of the preceding claims, characterized in that on the output side of the switch valve (14) in the direction of the pressure supply for the at least one hydraulic working section (A, B) in front of the input side of the control valve (34), a measuring connection (MS) is connected.
Steuervorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass auf der Ausgangsseite des Weichenventils (14) in Richtung der Druckversorgung für die Pilotventile (40) des Steuerventils (34) ein weiterer Stromregler (44) geschaltet ist. Control device according to one of the preceding claims, characterized in that on the output side of the switch valve (14) in the direction of the pressure supply for the pilot valves (40) of the control valve (34), a further current regulator (44) is connected.
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JP5809549B2 (en) * 2011-12-08 2015-11-11 株式会社Kcm Hydraulic drive

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WO2017167435A1 (en) 2017-10-05
US20200340499A1 (en) 2020-10-29
US10962031B2 (en) 2021-03-30
DE102016003972A1 (en) 2017-10-05
EP3436705B1 (en) 2020-08-05

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