CN104863913B - Control valve gear with floating position - Google Patents

Control valve gear with floating position Download PDF

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Publication number
CN104863913B
CN104863913B CN201510087072.9A CN201510087072A CN104863913B CN 104863913 B CN104863913 B CN 104863913B CN 201510087072 A CN201510087072 A CN 201510087072A CN 104863913 B CN104863913 B CN 104863913B
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China
Prior art keywords
pipeline
pressure
valve
control valve
control
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Application number
CN201510087072.9A
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Chinese (zh)
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CN104863913A (en
Inventor
W·卡拉夫特
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Linde Hydraulics GmbH and Co KG
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Linde Hydraulics GmbH and Co KG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • 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
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B2013/0412—Valve members; Fluid interconnections therefor with three positions
    • 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
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • 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
    • F15B2211/3052—Shuttle 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
    • F15B2211/305—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
    • 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
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional 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
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5159—Pressure control characterised by the connections of the pressure 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/575—Pilot pressure 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
    • F15B2211/60—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
    • F15B2211/6057—Load sensing circuits having valve means between output member and the load sensing circuit using directional control 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
    • F15B2211/635—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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/67—Methods for controlling pilot pressure

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The present invention relates to a kind of for controlling the control valve gear of the double-acting type hydraulic cylinder of mobile operation machinery, it includes control valve, the control valve is connected to the feed-line of pump, container pipeline, rise pipeline, decline on pipeline, control valve has neutral position, lifting position and down position, control valve gear that there is floating position, wherein control valve is manipulated in down position, wherein rising pipeline connect with container pipeline and pumps to connect to switch to decline side and do not work, being provided with discharge valve can connect with container so as to decline side and get around control valve and decline side is made to be connect with container in floating position.Control valve is manipulated in lifting position in operation is risen, wherein feed-line connect with rising pipeline and decline side can be made to be connect with container by means of discharge valve in operation is risen, and the pressure medium volume flow for connecting with container via discharge valve and being flowed out from decline side so as to decline pipeline flows out to container via discharge valve.

Description

Control valve gear with floating position
Technical field
The present invention relates to a kind of for controlling the control valve gear of the double-acting type hydraulic cylinder of mobile operation machinery, In, the control valve gear is included in the control valve to throttle in centre position, which is connected to the feed-line of pump, container Pipeline, the rising pipeline being connect with the uplifted side of the hydraulic cylinder, on the decline pipeline being connect with the decline side of the hydraulic cylinder, Wherein, the control valve have neutral position, lifting position and down position, the feed-line described in the neutral position and The container pipeline is ended with the rising pipeline and the connection for declining pipeline, is conveyed described in the lifting position Pipeline is connect with the rising pipeline and the decline pipeline is connect with the container pipeline, described in the down position Feed-line is connect with the decline pipeline and the rising pipeline is connect with the container pipeline, wherein, the control valve Device has the floating position for the hydraulic cylinder, wherein, the control valve described in the floating position being maneuvered to described In down position, the rising pipeline described in the down position is connect with the container pipeline, and the pump and the hydraulic pressure The connection of the decline side of cylinder is switched to not work, wherein, discharge valve is provided with, makes the hydraulic cylinder by means of the discharge valve Decline side can be connect in the case where getting around the control valve with container, wherein, by means of described in the floating position Discharge valve makes the decline side of the hydraulic cylinder be connect with the container.
Background technology
Made in mobile operation mechanical (such as excavator or wheeled loader) according to the control valve gear of generic With, for controlling hydraulic cylinder, the hydraulic cylinder controls the working equipment of the Work machine, such as excavator or rubber-tyred dress The cantilever of carrier aircraft.
In the control valve gear according to generic, using the floating position for controlling valve gear, there are respective negatives on hydraulic cylinder The decline of the saving energy of hydraulic cylinder, in the control valve gear, hydraulic pressure are realized during load in the case of no pump volume stream The decline side of cylinder and uplifted side are connect with container.Using controlling the floating position of valve gear that can equally realize, under Work machine The working equipment dropped in bottom surface can follow bottom unevenness.
According to the control valve gear of generic as known to 101 49 787B4 of DE.In order to which there are one neutral position, one with only tool The control valve of a lifting position and a down position realizes floating position in combination, and control valve is known that by this document The pressure balance for beinging maneuvered in down position and being allocated to the decline side of hydraulic cylinder is being maneuvered in rest position.Thus exist In down position, the uplifted side of hydraulic cylinder is connect via control valve with container.Via the pressure balance being loaded into rest position Ended the connection of the decline side of pump and hydraulic cylinder and then make pump and the connection of the decline side of hydraulic cylinder is switched to not act as With.In order to which the decline side for making hydraulic cylinder in floating position is equally connect with container, it is provided with variable in terms of pressure is adjusted Easing valve, which, which is allocated to, declines pipeline and minimal adjustment pressure is adjusted in floating position, so as in floating bit Equally the decline side of hydraulic cylinder is connect with container in putting.In addition, in floating position, the load pressure signal of hydraulic cylinder to pump Delivered volume regulating device on transmission be interrupted, it is minimum so as to pump in the floating position of control valve gear only supply Transport Stream.
According to the control valve gear of generic equally as known to WO 2013/103954A2.In order to which there are one neutral with only tool The control valve of position, a lifting position and a down position realizes floating position in combination, by this document it is known that control Valve is being maneuvered in down position, and in the down position, the uplifted side of hydraulic cylinder is connect via control valve with container.In order to incite somebody to action The decline side of hydraulic cylinder connect with container and makes pump and the connection of the decline side of hydraulic cylinder is switched to not work, and is provided with Dump valve, the dump valve are controlled in floating position in switching position, in the switching position, are declined pipeline and are connected with container It connects.Pump can be electric in terms of delivered volume adjust and so controlled in floating position so that pump be provided solely for it is small defeated The amount of sending.
In the rising operation of hydraulic cylinder, in this control valve gear, the hydraulic pressure that is expelled from from the decline side of hydraulic cylinder Medium is flowed to via the corresponding control seamed edge of control valve in container.Depending on the structure of control valve, for hydraulic cylinder via The pressure medium that control valve in lifting position is flowed in container can form high dynamic pressure and then formation is high to pressure, should Dynamic pressure and to be pressed in hydraulic cylinder rising run in corresponding energy loss is caused in turn result in corresponding loss power.
Invention content
The object of the present invention is to provide the control valve gears that a kind of beginning refers to generic, which can be with small Structure consumption and small cost consumption realize floating position and can realize loss power in the rising operation of hydraulic cylinder It reduces.
According to the present invention, which solves in the following way, i.e., control valve is grasped in the rising of hydraulic cylinder operation It indulges in lifting position, in the lifting position, feed-line is connect with rising pipeline, and in the rising operation of hydraulic cylinder The decline side that can make hydraulic cylinder by means of discharge valve is connect with container, via discharge valve and is held so as to the decline pipeline of hydraulic cylinder The pressure medium volume flow that device is connected and flowed out from the decline side of hydraulic cylinder flows out to container via discharge valve.
Design according to the present invention is as a result, also uses for the already existing discharge valve in floating position, by means of The discharge valve enables the decline side of hydraulic cylinder to be connect in the case where getting around control valve with container, so as in the upper elevator of hydraulic cylinder The decline side of hydraulic cylinder is made to be connect in the case where getting around control valve with container in row.Thus may be used using already existing discharge valve It is thereby reduced with the dynamic pressure reduced in the rising operation of hydraulic cylinder in the decline side of hydraulic cylinder and rises running energy Consume thereby reduces loss power.By repeatedly utilizing discharge valve so that the decline side of hydraulic cylinder is connect with container, Ke Yiyou This with small structure consumption and small cost consumption realize hydraulic cylinder floating position and hydraulic cylinder rising it is running dynamic The reduction of pressure.
Advantageous embodiment according to the present invention, discharge valve are configured with the switching of rest position and flow passing position Valve, wherein, discharge valve is being maneuvered in the floating position of hydraulic cylinder and in the rising of the hydraulic cylinder in flow passing position.This Kind discharge valve has small structure consumption, hence for floating position and for rising the reduction of running dynamic pressure with small Structure consumption realizes the unloading of the decline side of hydraulic cylinder.
Particular advantage is that advantageous embodiment according to the present invention, discharge valve is configured in terms of pressure is adjusted Adjustable and variable easing valve, the easing valve make the decline side of hydraulic cylinder be connect with container, wherein, easing valve is in hydraulic cylinder Floating position in and the hydraulic cylinder rising operation in be adjustable as minimal adjustment pressure.Using in terms of pressure is adjusted Changeable easing valve can equally realize that the decline side of hydraulic cylinder is via open easing valve and container with small structure consumption Connection equally realizes liquid hence for floating position and for the reduction for rising running dynamic pressure with small structure consumption The unloading of the decline side of cylinder pressure.
Advantageous embodiment according to the present invention, easing valve are configured to pressure limiting valve or Combined pressure restricting valve and filling liquid Valve, wherein, the adjusting pressure of pressure limiting valve is adjustable and variable.Using in terms of pressure is adjusted and then in terms of pressure is opened Adjustable pressure limiting valve can be realized with particularly simple structure consumption：It is for floating position and running for rising The decline side that the reduction of dynamic pressure realizes hydraulic cylinder is connect with container.
Particular advantage is that advantageous embodiment according to the present invention, discharge valve, which is arranged in, makes decline pipeline with holding In the bypass line of device pipeline connection, wherein, the downstream of the junction on bypass line to container pipeline, in container pipeline It is disposed with throttling set.Normally, two discharge valves are provided with according to the control valve gear of generic, one in these discharge valves It connect and is arranged in the bypass line for getting around control valve with rising pipeline, the bypass line and the appearance being connected on control valve Device pipeline connect, and in these discharge valves another with decline pipeline connect and be arranged in bypass control valve bypass pipe In line, which equally connect with the container pipeline being connected on control valve.Discharge valve is here used for ensuring tedge Maximum operating pressure in line and decline pipeline.The discharge valve for declining pipeline is allocated to as variable in terms of pressure is adjusted and The embodiment of changeable easing valve, thus, it is possible to be realized in a manner that abnormal cost is cheap, already existing easing valve in order to The maximum pressure of the decline side of hydraulic cylinder insures and is equally used for the upper elevator in the floating position of hydraulic cylinder and in hydraulic cylinder The decline side of hydraulic cylinder is made to be connect with container in row.It is realized using the throttling set being arranged in container pipeline, pressure is made to be situated between Recycling is realized in the decline side that matter can be from uplifted side to hydraulic cylinder.
Alternatively, discharge valve can be arranged in from decline pipeline and guide into the branch line of container.Using be arranged in from Decline pipeline and guide the additional discharge valve into the branch line of container, expend realization for the small additional structure of discharge valve In floating position and rise run in so that the decline side of hydraulic cylinder is connect with container.
Suitable make according to the present invention, discharge valve is according to loading the control valve towards lifting position direction It controls signal and/or can be manipulated to according to floating position signal in the position that the decline side of hydraulic cylinder is made to be connect with container.By This, in a simple manner it is possible that discharge valve so manipulates in operation is risen and in floating position so that hydraulic cylinder Decline side connect via discharge valve with container.
For this purpose, in discharge valve as in the embodiment of easing valve, making easing valve in an advantageous manner according to control Control valve towards lifting position direction control signal and/or can be towards reducing the adjusting according to the floating position signal The direction of pressure is adjusted.
According to the embodiment of the present invention, discharge valve can manipulate electricly.The sum of the floating position of dynamic pressure with reduction The operating status for rising operation for example can be by means of corresponding sensor or by means of operating device (such as control stick) It manipulates to identify, correspondingly to manipulate the discharge valve.For this purpose, it is provided with electronic control unit in an adequate manner, the electronics Control device controls the discharge valve and is connect with sensor or operating device.
Alternative embodiment according to the present invention, discharge valve can be manipulated hydraulically.
For this purpose, discharge valve as in the embodiment of easing valve, make in an advantageous manner easing valve adjust pressure side Face can hydraulically change.
Herein, control signal is made to be configured to hydraulic control pressure in an adequate manner, which is present in In the control pressure pipeline of control valve.
Herein, floating position signal is made to be configured to hydraulic operation pressure in an adequate manner, which deposits It is to control in pipeline.
The hydraulic operation of discharge valve can expend realization in simple structure in situations below：The manipulation device of discharge valve and behaviour Keyholed back plate line connects, which is connected on the output terminal of change valve device, wherein, the first input end of change valve device connects It is connected on the control pressure pipeline for guiding the hydraulic control signal, and the second input terminal of change valve device is connected to guiding On the control pipeline of the hydraulic operation pressure.By means of change valve device in a simple manner it is possible that being run rising It is middle that the control pressure of control valve is transferred on the manipulation device of discharge valve or arrives manipulation pressure transmission in floating position On the manipulation device of discharge valve, not only to be made in floating position but also in the rising operation of hydraulic cylinder by means of discharge valve The decline side of hydraulic cylinder is connect with container.
It is according to the present invention to be advantageously improved scheme, two-position switching valve is provided with, described in the two-position switching valve control Manipulation device is to manipulate the loading of pressure.In an adequate manner, two-position switching valve makes control pipeline in the first switching position Drainage makes control pipeline be connect with manipulating pressure source to container and in the second switching position.Utilize this two-position switching valve In a simple manner it is possible that floating position by by two-position switching valve be manipulated in the second switching position activate or By the way that two-position switching valve is manipulated in the first switching position to release.
In terms of pressure is adjusted in variable easing valve, manipulation device is preferably configured as adjusting pressure altering device.
Two-position switching valve can electricity ground or hydraulically manipulation implementation.
Make according to the present invention, control valve have the company of the decline side of the feed-line for being arranged in pump and hydraulic cylinder Pressure balance in connecing, wherein, in the floating position of hydraulic cylinder, pressure balance is manipulated to rest position by pressure signal In.Using already existing pressure balance (in order to loading nothing in the drive system that the pressure balance in load-sensitive adjusts Ground is closed to manipulate the hydraulic cylinder and have existed) it can be by the way that pressure balance be loaded into rest position and with for floating position Small additional consuming make pump and decline the connection of side to be ended and then be switched to not work.
Pressure signal is made to be formed by the discharge pressure pumped in an adequate manner.If instead of in load pressure and by the defeated of pump Pressurization pressure is directed on the control plane towards the effect of cut-off direction of pressure balance, then in the normal operation of load pressure and spring In the pressure balance that is manipulated towards rest position direction and the discharge pressure by pumping towards circulating direction can be for floating bit It puts and being maneuvered in rest position in a simple manner.
If pressure balance has the control plane towards the effect of rest position direction, the control plane and load pressure signal pipe Line connects, then the control plane acted on towards rest position direction of pressure balance can by the loading of load pressure or discharge pressure Controlled with small structure consumption, wherein, two-position switching valve make in the first switching position load pressure signal pipeline with it is negative Pressure report pipeline connection is carried, load pressure report pipeline guides the transport Stream adjustment of the adjusting pump to load-sensitive adjusted Device, and make load pressure signal pipeline with the signal pipe line of the pressure signal is guided to connect in the second switching position.By This, in the first switching position of two-position switching valve, pressure balance is controlled towards rest position direction by load pressure signal Make and in a normal way operation so as to load independently manipulate the hydraulic cylinder.For floating position, two-position switching valve It being maneuvered in the second switching position, so as to make the feed-line of pump extremely by means of the pressure balance beinging maneuvered in rest position The connection of the decline side of hydraulic cylinder is ended.
Signal pipe line is made to be connected on the feed-line of pump in an adequate manner.
Description of the drawings
The further advantage and details of the present invention is explained in detail according to the embodiment shown in schematic diagram.It is shown here：
Fig. 1 shows the line map of the first embodiment of the present invention,
Fig. 2 with amplify illustrate Fig. 1 Local map and
Fig. 3 shows the line map of second embodiment of the present invention.
Specific embodiment
Fig. 1 shows for example to be configured to the load-sensitive adjustment of the mobile operation machinery of excavator or wheeled loader Drive system AS line map, which has control valve gear SV according to the present invention.
Drive system AS is included in adjustable pump 1 in terms of delivered volume, and the pump is in the illustrated embodiment open It is run in circuit and input side is connect with container 2 and outlet side is conveyed into feed-line 3, multiple customers are connected to this On feed-line.Show to be configured to the customer of double-acting type hydraulic cylinder 4 in the illustrated embodiment, for the control of the customer It sets up and is equipped with control valve gear SV according to the present invention.
Control valve gear SV is included in the control valve 5 to throttle in centre position.It is configured to make the cantilever of Work machine to rise There is uplifted side A with the hydraulic cylinder 4 of the linear actuator of decline and decline side B.Uplifted side A is connected to control by means of rising pipeline 6a On valve 5.Decline side B and be connected on control valve 5 by means of declining pipeline 6b.In addition, control valve 5 is connected to the feed-line 3 of pump 1 Upper and reservoir limb pipeline 8a, 8b and container 2 by means of being connected on container pipeline 8 are connected.
In the illustrated embodiment, uplifted side A is made of the balancing gate pit of the piston side of hydraulic cylinder 4, and declines side B by liquid The balancing gate pit of the piston rod side of cylinder pressure 4 is formed.
The control valve 5 for being configured to multi-way valve has neutral position N, in the neutral position, pumps the company of 1 feed-line 3 It connects and container pipeline 8 is ended with rising pipeline 6a and declining the connection of pipeline 6b.It is defeated in the lifting position H of control valve 5 Pipeline 3 is sent to be connect, and decline pipeline 6b and connect with reservoir limb pipeline 8b with rising pipeline 6a.Correspondingly, in control valve 5 In down position S, decline pipeline 6b and connect with feed-line 3, and rise pipeline 6a and connect with reservoir limb pipeline 8.Control Valve 5 has the measuring diaphragm not being shown specifically in lifting position H and equipped with the pressure day for being arranged in the measuring diaphragm downstream Flat 11a.In addition, control valve 5, which has the measuring diaphragm not being shown specifically and is equipped in down position S, is arranged in the measured hole The pressure balance 11b in plate downstream.
In directional control of the control valve 5 towards lifting position H pressure balance 11a downstreams, hydraulic cylinder 4 is present in The load pressure risen on the A of side is reported and is transferred in load pressure signal pipeline 20a that the load pressure signal pipeline connects Onto the load pressure report pipeline 21 of load sensitive system.Correspondingly, when control valve 5 is towards down position S directional controls It is reported in pressure balance 11b downstreams, hydraulic cylinder 4 load pressure being present on decline side B and is transferred to load pressure In force signal pipeline 20b, which can report that pipeline 21 is connect with load pressure.
It is not shown further, be configured to multi-way valve, control for controlling other customers of the drive system Valve is accordingly connected on feed-line 3, container pipeline 8 and load pressure report pipeline 21.
The structure of pressure balance 11a or pressure balance 11b are described in detail according to Fig. 2, illustrate Fig. 1 in the figure with amplification Control valve gear SV.
From feed-line 3 to the pressure balance 11a tools being arranged in the circulation path of tedge line 6a in lifting position H There is flow passing position 12a and rest position 12b.Towards the direction of flow passing position 12a, pressure balance 11a measures section by being present in The discharge pressure in stream device downstream is loaded.Towards the direction of rest position 12b, pressure balance 11a is by the customer that is controlled Highest load pressure loaded.The load pressure signal path being made of load pressure signal pipeline 20a of uplifted side A exists Pressure balance 11a downstreams start in a bifurcation, and in the bifurcation, load pressure signal pipeline 20a is from the logical circulation road of uplifted side A Diameter diverges.Control pipeline 13a from load pressure signal pipeline 20a be bifurcated into pressure balance 11a, towards rest position 12b side To the control pressure face of effect.
In the pressure balance 11b tools being arranged in from feed-line 3 to the circulation path for declining pipeline 6b in down position S There is flow passing position 12a and rest position 12b.Towards the direction of flow passing position 12a, pressure balance 11a measures section by being present in Flow the discharge pressure loading in device downstream.Towards the direction of rest position 12b, pressure balance 11a is by the highest of the customer controlled Load pressure loads.Decline the load pressure signal path formed by load pressure signal pipeline 20b of side B in pressure balance 11a downstreams start in a bifurcation, and in the bifurcation, load pressure signal pipeline 20b diverges from the circulation path for declining side B. Control pipeline 13b from load pressure signal pipeline 20b be bifurcated into pressure balance 11b, act on towards rest position 12b directions Control pressure face.
In the case where manipulating multiple customers, the highest load pressure of the customer of control is present in load pressure report In pipeline 21, to control the conveying capacity for being configured to the pump 1 for adjusting pump in the illustrated embodiment.1 is pumped in order to control conveying capacity And with regulating device 25, such as adjustable pitch in terms of gradient of axial poiston pump, the axial poiston pump is in order to grasp It indulges and is in effect with regulating piston device 26 and connects.Regulating piston device 26 has the direction of the conveying capacity towards increase pump 1 The control pressure room 26a of effect, the control pressure room are loaded with the discharge pressure for pumping 1.Feed-line is directed to for this purpose, being provided with Control pipeline 3b on 3.In addition, towards the direction of increase conveying capacity, spring assembly 27 can work.Regulating piston pipeline 26 , towards reduce pump 1 conveying capacity direction effect control pressure room 26b loading can by means of be configured to the flow of requirement adjustment The transport Stream adjuster 30 of valve controls.Transport Stream adjuster 30 makes control pressure room 26b in the first control position 30a shown It is connect with container 2.In the second control position 30b, control pressure room 26b connect with the feed-line of pump 1 and then by the defeated of pump 1 Pressurization pressure loads.Transport Stream adjuster 30 is loaded by the discharge pressure of pump 1 towards the second adjusting position 30b directions.Towards first Control the direction of position 30a, transport Stream adjuster 30 is present in load pressure report by the customer that controls and spring assembly 31 The highest load pressure loading in pipeline 21 is accused, the preload of the spring assembly corresponds to the adjustment pressure of load sensitive system Difference.
Control valve 5 is by means of controlling signal X towards the direction of lifting position H and by means of controlling signal Y towards decline The direction of position S can manipulate.Control signal X is formed by being present in the hydraulic control pressure in control pressure pipeline 35a, the hydraulic pressure Control pressure is connected with the corresponding control plane of control valve 5.Signal Y is controlled correspondingly by being present in control pressure pipeline 35b Hydraulic control pressure form, the corresponding control plane connection of the hydraulic control pressure and control valve 5.
Insure for the maximum pressure of hydraulic cylinder, control valve gear SV is equipped with easing valve 40a, 40b.Easing valve 40a is arranged In the bypass line 41a that rising pipeline 6a is made to be connect with reservoir limb pipeline 8a, which gets around control valve 5.Insurance Valve 40b is arranged in the bypass line 41b that decline pipeline 6b is made to be connect with reservoir limb pipeline 8b, which gets around control Valve 5.The junction on junction downstream and bypass line 41a to container pipeline 8 on bypass line 41b to container pipeline 8 Downstream is disposed with throttling set 42 in container pipeline 8.
Easing valve 40a, 40b are configured to Combined pressure restricting valve and prefill valve in the illustrated embodiment.
In addition, control valve gear SV has the floating position for hydraulic cylinder 4, in the floating position, hydraulic cylinder 4 it is upper It rises side A and declines side B and connect with container 2.In the floating position of hydraulic cylinder 4, control valve 5 is being maneuvered in down position S, In the down position, rise pipeline 6a and connect with reservoir limb pipeline 8a and then with container pipeline 8.
In addition, in floating position, pump 1 and the connection of the decline side B of hydraulic cylinder 4 is made to be switched to not work.For this purpose, In the case where control valve 5 is in down position S, it is arranged in the connection of the feed-line 3 of pump 1 and the decline side B of hydraulic cylinder 4 In pressure balance 11b be manipulated in rest position 12b by pressure signal.
For this purpose, load pressure signal pipeline 20b is connected in two-position switching valve 50, which is controlling It is connect in the down position S of valve 5 processed with the control plane acted on towards rest position 12b directions of pressure balance 11b.Switching valve 50 With the first switching position 50a, in first switching position, load pressure signal pipeline 20b reports pipeline with load pressure 21 connections, load pressure report pipeline guide the transport Stream adjuster 30 of adjusting pump 1 adjusted to load-sensitive.Switching valve 50 With the second switching position 50b, in second switching position, the letter of load pressure signal pipeline 20b and guide pressure signal Number pipeline 51 connects.
In the illustrated embodiment, pressure signal is formed by the discharge pressure of pump 1, for this purpose, signal pipe line 51 is connected to pump 1 Feed-line 3 on.
Two-position switching valve 50 is being maneuvered in the first switching position 50a by means of spring 52 and can be by means of manipulating Device 53 is switched in the second switching position 50b.In the floating position of control valve gear SV, two-position switching valve 50 is manipulated Into the second switching position 50b.
In the illustrated embodiment, two-position switching valve 50 can electricity manipulate, for this purpose, manipulation device 53 by magnet (such as electricity Magnetic switch) it forms, which connect with the electronic control unit for control not being shown specifically.
In order to which decline pipeline 6b is made to be connect with container 2 in floating position, control valve gear 5 is equipped with discharge valve 60, by The decline side B for making hydraulic cylinder 4 in floating position in the discharge valve is connect in the case where getting around control valve 5 with container 2.
Further according to the present invention, it can be reduced and be present in decline side B in the rising operation of hydraulic cylinder 4 using discharge valve 60 Dynamic pressure, to reduce dissipation power.In operation is risen, control valve 5 is being maneuvered in lifting position H, in the lifting position In, feed-line 3 is connect with rising pipeline 6a.Made under hydraulic cylinder 4 in the rising operation of hydraulic cylinder 4 by means of discharge valve 60 Drop side B is connect with container 2, so that the decline pipeline 6b of hydraulic cylinder 4 connect with container 2 via discharge valve 60 and from hydraulic cylinder 4 Decline side B outflow pressure medium volume flow flow out to container via discharge valve 50 and then in the case where getting around control valve 5 2。
In the embodiment of Fig. 1 and Fig. 2, discharge valve 60 is arranged in from decline pipeline 6b and guides to the branch line of container 2 In 6c.Discharge valve 60 is configured to adjustable and variable easing valve 61 in terms of pressure is adjusted, which makes hydraulic cylinder 4 Decline pipeline 6b connect with container 2.Easing valve 61 is not only in floating position but also adjustable in the rising operation of hydraulic cylinder 4 It saves as minimal adjustment pressure.
Easing valve 61 is configured to Combined pressure restricting valve and prefill valve 62 in the illustrated embodiment, wherein, the tune of pressure limiting valve Section pressure is adjustable and variable.
Easing valve 61 is adjusted to maximal regulated pressure by means of spring assembly 63.Spring can be changed by means of manipulation device 65 The preload of device 63 and then the adjusting pressure of adjustable easing valve 61.
In order to make easing valve 61 not only in floating position but also be adjusted to minimal adjustment pressure in operation is risen, protect Dangerous valve 61 is according to controlling the control valve 5 towards the control signal X in lifting position direction and/or can according to floating position signal Z It is adjusted towards the direction for reducing adjusting pressure.
In the illustrated embodiment, easing valve 61 can hydraulically change in terms of pressure is adjusted.
If hereinbefore explained, control signal X is configured to hydraulic control pressure, which is present in control In pressing pressure pipeline 35a.Floating position signal Z is configured to hydraulic operation pressure, which is present in control pipeline In 70.Control pipeline 70 is connect herein with manipulating pressure source 71 (such as control pressure pump or supply pump of drive system AS).
In order to not only in floating position by floating position signal Z and also rise run in by controlling signal Easing valve 61 is adjusted to minimal adjustment pressure by X, and the manipulation device 65 of easing valve 61 is connect with manipulation pipeline 75, the manipulation pipeline It is connected on the output terminal of change valve device 76.The first input end of change valve device 76 is connected to by means of branch line 77 to be drawn It leads hydraulic control pressure and then guides on the control pressure pipeline 35a for controlling signal X.Second input terminal of change valve device 76 connects It is connected on the control pipeline 70 of guiding hydraulic operation pressure Z.Only exist to will be present in the manipulation pressure in control pipeline 70 It is transferred on manipulation device 65 as floating position signal Z in floating position, manipulation device 65 is using by control pipeline 70 Manipulating the loading of floating position signal Z that pressure is formed can be controlled by means of two-position switching valve 50.
In the first switching position 50a of two-position switching valve 50, control pipeline 70 is connect with manipulating pressure source 71 Section is ended and the section being connect with the second input terminal of change valve device 76 of pipeline 70 is controlled to be vented to container 2. In the second switching position 50b of two-position switching valve 50, control pipeline 70 is opened, and is changed so as to which floating position signal Z is present in On the second input terminal of valve gear 76.
In fig 1 and 2, control valve 5 is collectively arranged in easing valve 40a, 40b in control valve chest 80.
In order to which two-position switching valve 50 necessary to activating and releasing floating position is arranged in a housing or installing plate 81 In, the housing is in flanged joint to control valve chest 80.
Discharge valve 60 is arranged in a housing or installing plate 82, and the housing is equally with flanged joint to control valve chest 80 On.
Second embodiment of the present invention is shown in FIG. 3.Identical component is equipped with identical reference numeral.
In figure 3, in order to make in the rising operation of hydraulic cylinder 4 and in floating position the decline side B of hydraulic cylinder 4 with holding Device 2 connects, and the function of discharge valve 60 is accepted by already existing easing valve 40b, which is arranged in bypass line 41b, The bypass line makes decline pipeline 6b be connect with container 2.With Fig. 1 and Fig. 2 correspondingly, Fig. 3's has the function of discharge valve 60 Easing valve 40b is configured to adjustable and variable easing valve 61 in terms of pressure is adjusted, which is preferably configured as combining Formula pressure limiting valve and prefill valve 62, wherein, the adjusting pressure of pressure limiting valve is adjustable and variable by means of manipulation device 65.
The control valve gear SV according to the present invention of Fig. 1 to 3 works as follows.
In the rising operation of hydraulic cylinder 4, two-position switching valve 50 is not controlled and in the first switching position 50a In, floating position releases in first switching position.Control signal X make control valve 5 towards lifting position H directions loading and It is present in manipulation pipeline 75 via reversal valve 76, as a result, adjustable easing valve 40b (Fig. 3) or 61 in terms of pressure is adjusted (Fig. 1 and Fig. 2) is adjusted by control signal X towards the direction for adjusting pressure is reduced.The energy in the case where easing valve 40b or 61 is opened It realizes bypass switching, the decline side B of hydraulic cylinder 4 is made to connect in the case where getting around control valve 5 with container 2 using bypass switching It connects.Make the dynamic pressure declined at the B of side of hydraulic cylinder 4 in the rising operation of hydraulic cylinder 4 as a result, and then to pressing by by control signal X activates easing valve 40b or 61 to reduce, it is possible thereby to reduce the loss power of drive system AS.
For the floating position of hydraulic cylinder 4, control valve 5 is manipulated in down position S by control signal Y and by dibit Switching valve 50 is put to be manipulated in the second switching position 50b.Thus the discharge pressure being present in the feed-line 3 of pump 1 is present in It is loaded into rest position 12b in load pressure signal pipeline 20b and by pressure balance 11b.The load pressure of hydraulic cylinder 4 arrives Transmission on load pressure report pipeline 21 and then onto the transport Stream adjuster 30 of pump 1 is cut the second of two-position switching valve 50 It blocks in change place 50b, is maintained in the position with minimum delivery stream so as to pump 1.In addition, the of two-position switching valve 50 In two switching position 50b, floating position signal Z via reversal valve 76 be present in manipulation pipeline 75 in, as a result, easing valve 40b or 61 are adjusted by floating position signal Z towards the direction for adjusting pressure is reduced, so that the decline side B for making hydraulic cylinder 4 is connect with container. The uplifted side A of hydraulic cylinder 4 is connect via the control valve 5 in down position S with container 2.In floating position, it is possible thereby to The decline of the no pressure of hydraulic cylinder 4 is realized in the case of the transport Stream of no pump 1.Herein, via easing valve 40b or 61 The recycling that declines in side B of the pressure medium from container pipeline 8 or from container 2 to hydraulic cylinder 4 is realized with short flow distance.
In floating position, realized again by the no pressure switching of the uplifted side A and decline side B of hydraulic cylinder 4：Operation The working equipment being reduced in bottom surface of machinery can generate bottom unevenness and can be adapted to bottom profile trend.
The present invention has series of advantages：
Using discharge valve 60 according to the present invention by repeatedly utilize discharge valve 60 can with less structure consumption and into This consuming not only realizes the floating position of hydraulic cylinder 4 but also realizes the reduction of the running dynamic pressure of rising of hydraulic cylinder 4.
If the function of discharge valve 60 is accepted by already existing easing valve 40b, the decline side B of hydraulic cylinder 4 is being floated Connection in dynamic position and the reduction for rising running dynamic pressure, without additional discharge valve 60, but are only being adjusted In terms of pressure convertibly and variably implement the hydraulic cylinder 4 decline side B already existing easing valve 40b.
In the present invention, by repeatedly utilizing discharge valve 60 for the floating position of hydraulic cylinder 4 and for rising in operation The reduction of dynamic pressure obtain less structure consumption and less cost consumption for the two functions.
The present invention is not limited to shown embodiment.It is replaced in and manipulates two-position switching valve 50 electricly, which cuts Changing valve 50 can alternatively hydraulically, for example be manipulated by hydraulic pressure pwc control pressure.
Discharge valve 60 described in adjusting pressure aspect hydraulic regulation is substituted in, alternatively adjusts this electricly in terms of pressure is adjusted Discharge valve 60 is possible, wherein, control signal X and floating position signal Z can be detected by means of sensor or for floating Dynamic position can be directly by operating device (such as control stick) in the manipulation for rising discharge valve 60 in operation of the hydraulic cylinder 4 It manipulates and manipulation signal identifies, rising can control to run and floating position using the operating device.

Claims (22)

1. it is a kind of for controlling the control valve gear (SV) of the double-acting type hydraulic cylinder (4) of mobile operation machinery, wherein, it is described Control valve gear (SV) is included in the control valve (5) to throttle in centre position, which is connected to the feed-line of a pump (1) (3), a container pipeline (8), a rising pipeline (6a) being connect with the uplifted side (A) of the hydraulic cylinder (4), one and the hydraulic pressure On the decline pipeline (6b) of decline side (B) connection of cylinder (4), wherein, the control valve (5) has neutral position (N), upper raise-position Put (H) and down position (S), in the neutral position, the feed-line (3) and the container pipeline (8) with it is described Rise pipeline (6a) and the connection for declining pipeline (6b) is ended, in the lifting position, the feed-line (3) It is connect with the rising pipeline (6a) and the decline pipeline (6b) connect with the container pipeline (8), in the lower decrease In putting, the feed-line (3) connect with the decline pipeline (6b) and the rising pipeline (6a) and the container pipeline (8) it connects, wherein, the control valve gear (SV) has the floating position for the hydraulic cylinder (4), wherein, in the liquid In the floating position of cylinder pressure (4), the control valve (5) is being maneuvered in the down position (S), in the down position, institute It states rising pipeline (6a) to connect with the container pipeline (8), and the pump (1) and the decline side (B) of the hydraulic cylinder (4) Connection is switched to not work, wherein, one discharge valve of setting (60) can make the hydraulic cylinder (4) by means of the discharge valve Decline side (B) connect in the case of around the control valve (5) with the container (2), wherein, in the floating position In, the decline side (B) for making the hydraulic cylinder (4) by means of the discharge valve (60) is connect with the container (2), and feature exists In in the rising operation of the hydraulic cylinder (4), the control valve (5) is being maneuvered in the lifting position (H), on this During raise-position is put, the feed-line (3) connect with the rising pipeline (6a), in the rising operation of the hydraulic cylinder (4), borrows Helping the discharge valve (60) can be such that the decline side (B) of the hydraulic cylinder (4) is connect with the container (2), so as to the liquid The decline pipeline (6b) of cylinder pressure (4) connect with the container (2) via the discharge valve (60) and from the hydraulic cylinder (4) The pressure medium volume flow for declining side (B) outflow flow to the container (2) via the discharge valve (60).
2. control valve gear according to claim 1, which is characterized in that the discharge valve (60) is configured with cut-off position The switching valve with flow passing position is put, wherein, the discharge valve is in the floating position and when the hydraulic cylinder (4) rises It being maneuvered in the flow passing position.
3. control valve gear according to claim 1, which is characterized in that the discharge valve (60) is configured to adjusting pressure Easing valve (40b that is that aspect can be adjusted and can changing；61), the easing valve makes the decline side (B) of the hydraulic cylinder (4) It is connect with the container (2), wherein, the easing valve (40b；61) in the floating position and in the hydraulic cylinder (4) Rising operation in can be adjusted to minimal adjustment pressure.
4. control valve gear according to claim 3, which is characterized in that the easing valve (40b；61) it is configured to pressure limiting valve Or Combined pressure-limiting-and prefill valve (62), wherein, the adjusting pressure of the pressure limiting valve can be adjusted and can be changed.
5. control valve gear according to any one of claim 1 to 4, which is characterized in that discharge valve (60) arrangement In the bypass line (41b) that the decline pipeline (6b) is made to be connect with the container pipeline (8), wherein, in the bypass pipe Line (41b) and the downstream of the junction of the container pipeline (8), one throttling set of arrangement (42) in the container pipeline (8).
6. control valve gear according to any one of claim 1 to 4, which is characterized in that discharge valve (60) arrangement In the branch line (6c) from the decline pipeline (6b) towards the container (2).
7. control valve gear according to any one of claim 1 to 4, which is characterized in that the discharge valve (60) can According to by the control valve (5) towards the lifting position (H) direction load control signal (X) and/or according to floating bit Confidence number (Z) is being maneuvered in the position that the decline side (B) of the hydraulic cylinder (4) is made to be connect with the container (2).
8. control valve gear according to claim 3 or 4, which is characterized in that the easing valve (40b；It 61) being capable of basis By the control valve (5) towards the control signal (X) of the direction controlling of the lifting position (H) and/or according to the floating bit Confidence number (Z) is adjusted towards the direction for adjusting pressure is reduced.
9. control valve gear according to any one of claim 1 to 4, which is characterized in that the discharge valve (60) can It is manipulated by electricity.
10. control valve gear according to any one of claim 1 to 4, which is characterized in that the discharge valve (60) can By hydraulic operation.
11. control valve gear according to claim 3 or 4, which is characterized in that the easing valve (40b；It 61) being capable of hydraulic pressure Ground changes in terms of pressure is adjusted.
12. control valve gear according to claim 7, which is characterized in that the control signal (X) is configured to hydraulic control Pressure, the hydraulic control pressure are present in the control pressure pipeline (35a) of the control valve (5).
13. control valve gear according to claim 7, which is characterized in that the floating position signal (Z) is configured to hydraulic pressure Pressure is manipulated, which is present in control pipeline (70).
14. valve gear is controlled according to claim 12 or 13, which is characterized in that the manipulation device of the discharge valve (60) (65) it is connect with manipulation pipeline (75), which is connected to the output terminal of change valve device (76), wherein, the reversal valve The first input end of device (76) is connected to the control pressure pipeline (35a) that guides the hydraulic control pressure (X) and described Second input terminal of change valve device (76) is connected to the control pipeline (70) for guiding the hydraulic operation pressure (Z).
15. control valve gear according to claim 14, which is characterized in that setting a pair of position switching valve (50), this pair Position switching valve makes control pipeline (70) drainage to the container (2) and second in the first switching position (50a) The control pipeline (70) is made to be connect with manipulating pressure source (71) in switching position (50b).
16. control valve gear according to claim 15, which is characterized in that the two-position switching valve (70) is described floating It is being maneuvered in second switching position (50b) in dynamic position.
17. control valve gear according to claim 14, which is characterized in that the easing valve (40b；61) manipulation device (65) it is configured to adjust pressure altering device.
18. the control valve gear according to any one of claim 15 to 17, which is characterized in that the two-position switching valve (50) can by electricity manipulate or can be by hydraulic operation.
19. control valve gear according to any one of claim 1 to 4, which is characterized in that the control valve (5) has The pressure balance being arranged in the feed-line (3) of the pump (1) and the connecting portion of the decline side (B) of the hydraulic cylinder (4) (11b), wherein, in the floating position of the hydraulic cylinder (4), the pressure balance (11b) is manipulated to by pressure signal and cut Stop bit is put in (12b).
20. control valve gear according to claim 19, which is characterized in that the pressure signal is defeated by the pump (1) Pressurization pressure is formed.
21. control valve gear according to claim 20, which is characterized in that the pressure balance (11b) have towards cut Stop bit puts the control plane of the direction effect of (12b), which connect with load pressure signal pipeline (20b), wherein, it is described double Position switching valve (50) makes the load pressure signal pipeline (20b) report pipe with load pressure in the first switching position (50) Line (21) connects, and load pressure report pipeline guides the transport Stream adjuster of adjusting pump (1) to load-sensitive adjusted (30), the two-position switching valve makes the load pressure signal pipeline (20b) and guiding institute in the second switching position (50b) State signal pipe line (51) connection of pressure signal.
22. control valve gear according to claim 21, which is characterized in that the signal pipe line (51) is connected to the pump (2) feed-line (3).
CN201510087072.9A 2014-02-24 2015-02-25 Control valve gear with floating position Active CN104863913B (en)

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