CN102748335B - A kind of hydraulic system and development machine - Google Patents

A kind of hydraulic system and development machine Download PDF

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Publication number
CN102748335B
CN102748335B CN201210225278.XA CN201210225278A CN102748335B CN 102748335 B CN102748335 B CN 102748335B CN 201210225278 A CN201210225278 A CN 201210225278A CN 102748335 B CN102748335 B CN 102748335B
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CN
China
Prior art keywords
control valve
communicated
valve
solenoid directional
oil
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.)
Expired - Fee Related
Application number
CN201210225278.XA
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Chinese (zh)
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CN102748335A (en
Inventor
陈锷
杨文林
闫炳雷
刘文东
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Sany Heavy Equipment Co Ltd
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Sany Heavy Equipment Co Ltd
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Publication date
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Priority to CN201210225278.XA priority Critical patent/CN102748335B/en
Publication of CN102748335A publication Critical patent/CN102748335A/en
Priority to PCT/CN2012/085805 priority patent/WO2014005396A1/en
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Publication of CN102748335B publication Critical patent/CN102748335B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/30575—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 in a Wheatstone Bridge arrangement (also half bridges)
    • 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
    • F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
    • 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
    • F15B2211/40561—Flow control characterised by the type of flow control means or valve with pressure compensating valves the pressure compensating valve arranged upstream of the flow control 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—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

Abstract

The present invention relates to technical field of engineering machinery, disclose a kind of hydraulic system and development machine.Wherein, a kind of hydraulic system, comprising: for controlling the proportional reversing valve group of the second actuating mechanism work needing speed governing; For controlling the switch selector valve group of the first actuating mechanism work not needing speed governing.Actuating mechanism is divided into two classes, one class is the second actuating mechanism needing to regulate operating rate, second actuating mechanism passing ratio selector valve group controls, the second actuating mechanism can be regulated as required, another kind of is the first actuating mechanism not needing to regulate operating rate, first actuating mechanism is controlled by switch selector valve group, and realize the first actuating mechanism smooth working, the present invention effectively can solve the problem that existing hydraulic system reinstate rate is low, loop is complicated, element cost is high.

Description

A kind of hydraulic system and development machine
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to a kind of hydraulic system and the development machine of this hydraulic system is installed.
Background technique
At present, hydraulic system is provided with the multi-way valve controlling actuator's movement velocity and moving direction usually, but some does not need the actuator of speed governing to use identical oil circuit control too, cause unnecessary waste, such as, the hydraulic control device that development machine adopts is be load sensing multi-way valve mostly, and for controlling moving direction and the speed of actuator, its control mode is Non-follow control or Hydraulic guide control.Load sensing multi-way valve adopts split blade type structure, and each multi-way valve provides a road hydraulic oil.The flow of hydraulic oil is determined by the opening area of main valve plug and the main valve plug pressure reduction that determined by pressure compensator.
Adopt the HYDRAULIC CONTROL SYSTEM shovel plate oil cylinder, rear support oil cylinder etc. of split blade type load sensing multi-way valve not to need the mechanism of speed governing, cause that hydraulic system efficiency is low, loop is complicated, element high in cost of production shortcoming.
Therefore, how improving for existing hydraulic system, to solve the problem that existing hydraulic system reinstate rate is low, loop is complicated, element cost is high, is those skilled in the art's technical barriers urgently to be resolved hurrily.
Summary of the invention
In view of this, the present invention is intended to propose a kind of hydraulic system and development machine, to solve the problem that existing hydraulic system reinstate rate is low, loop is complicated, element cost is high.
On the one hand, the invention provides a kind of hydraulic system, comprising:
For controlling the proportional reversing valve group of the second actuating mechanism work needing speed governing;
For controlling the switch selector valve group of the first actuating mechanism work not needing speed governing.
Further, described proportional reversing valve group comprises: another oil-feed oil circuit;
First pilot pressure oil circuit;
Another oil return circuit;
Another load feedback oil circuit;
Another draining oil circuit;
Another working oil path; And,
The throttle grverning assembly be communicated with another draining oil circuit described with another oil-feed oil circuit described, described first pilot pressure oil circuit; Throttle grverning assembly carries out throttle grverning control by the first pilot pressure oil circuit to another oil-feed oil circuit;
Be communicated with described throttle grverning assembly with another oil return circuit described, another draining oil circuit described, another working oil path described second commutates assembly; Second commutation assembly carries out commutation by the oil circuit exported throttle grverning assembly and regulates, to realize the control to another working oil path.
Further, described throttle grverning assembly comprises:
Pressure compensator, described pressure compensator comprise filler opening, oil outlet, first compensate oil circuit and and second compensate oil circuit, the filler opening of described pressure compensator is communicated with another oil-feed oil circuit described;
Hydraulic control proportional flow control valve, described hydraulic control proportional flow control valve comprises filler opening, oil outlet, control port and drain tap, and first of described pressure compensator compensates oil circuit and second and compensates oil circuit and be communicated with at the filler opening of described hydraulic control proportional flow control valve and oil outlet respectively; The filler opening of described hydraulic control proportional flow control valve is communicated with described pressure compensator oil outlet; The drain tap of described hydraulic control proportional flow control valve is communicated with another draining oil circuit described; For regulating the solenoid-operated proportional reduction valve of described hydraulic control proportional flow control valve flow; Described solenoid-operated proportional reduction valve comprises filler opening, oil outlet and Electromagnetic Control end, the filler opening of described solenoid-operated proportional reduction valve is communicated with described first pilot pressure oil circuit, the oil outlet of described solenoid-operated proportional reduction valve is communicated with the control port of described hydraulic control proportional flow control valve, the Electromagnetic Control end external controller of described solenoid-operated proportional reduction valve.
Further, described second commutation assembly comprises:
The the first hydraulic pressure reversing unit be communicated with described hydraulic control proportional flow control valve oil outlet;
The first solenoid directional control valve be communicated with described first hydraulic pressure reversing unit.
Further, described first hydraulic pressure reversing unit comprises:
First logical valve, its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve oil outlet, and the second hydraulic fluid port of described first logical valve is communicated with the second hydraulic fluid port of another working oil path described;
Second logical valve, its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve oil outlet, and the second hydraulic fluid port of described second logical valve is communicated with the first hydraulic fluid port of another working oil path described;
3rd logical valve, its first hydraulic fluid port is communicated with another oil return circuit described, and described second hydraulic fluid port of the 3rd logical valve is communicated with the second hydraulic fluid port of another working oil path described;
4th logical valve, its first hydraulic fluid port is communicated with another oil return circuit described, and described second hydraulic fluid port of the 4th logical valve is communicated with the first hydraulic fluid port of another working oil path described; Wherein
Described first solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described first solenoid directional control valve is communicated with described hydraulic control proportional flow control valve oil outlet, and the drain tap of described first solenoid directional control valve is communicated with another draining oil circuit described; First oil outlet of described first solenoid directional control valve is communicated with the control port of the control port of described first logical valve with described 4th logical valve; Second oil outlet of described first solenoid directional control valve is communicated with the control port of the control port of described second logical valve with described 3rd logical valve; Described first solenoid directional control valve comprises three kinds of working staties:
Under the first working state, the drain tap of described first solenoid directional control valve is communicated with the control port of described 4th logical valve with the control port of the control port of described first logical valve, described second logical valve, the control port of described 3rd logical valve with the second oil outlet respectively by the first oil outlet of described first solenoid directional control valve;
Under the second working state, the filler opening of described first solenoid directional control valve is communicated with the control port of the control port of described first logical valve with described 4th logical valve by the first oil outlet of described first solenoid directional control valve; The drain tap of described first solenoid directional control valve is communicated with the control port of the control port of described second logical valve with described 3rd logical valve by the second oil outlet of described first solenoid directional control valve;
Under the third working state, the filler opening of described first solenoid directional control valve is communicated with the control port of the control port of described second logical valve with described 3rd logical valve by the second oil outlet of described first solenoid directional control valve; The drain tap of described first solenoid directional control valve is communicated with the control port of the control port of described first logical valve with described 4th logical valve by the first oil outlet of described first solenoid directional control valve.
Further, described first hydraulic pressure reversing unit comprises:
First hydraulicdirectional control valve, comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of described first hydraulicdirectional control valve is communicated with described hydraulic control proportional flow control valve oil outlet; The return opening of described first hydraulicdirectional control valve is communicated with another oil return circuit described; First oil outlet of described first hydraulicdirectional control valve is communicated with the second hydraulic fluid port with the first hydraulic fluid port of another working oil path described respectively with the second oil outlet; Described first hydraulicdirectional control valve comprises three working staties:
In the first operative state, the first oil outlet of described first hydraulicdirectional control valve is communicated with the return opening of the second oil outlet with described first hydraulicdirectional control valve;
In a second operative state, the first oil outlet of described first hydraulicdirectional control valve is communicated with the filler opening of described first hydraulicdirectional control valve, and the second oil outlet of described first hydraulicdirectional control valve is communicated with the return opening of described first hydraulicdirectional control valve;
Under the 3rd working state, the first oil outlet of described first hydraulicdirectional control valve is communicated with the return opening of described first hydraulicdirectional control valve, and the second oil outlet of described first hydraulicdirectional control valve is communicated with the filler opening of described first hydraulicdirectional control valve;
Described first solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described first solenoid directional control valve is communicated with described first pilot pressure oil circuit or is communicated with described hydraulic control proportional flow control valve oil outlet, and the drain tap of described first solenoid directional control valve is communicated with another draining oil circuit described; First oil outlet of described first solenoid directional control valve is communicated with the second control port with the first control port of described first hydraulicdirectional control valve respectively with the second oil outlet; Described first solenoid directional control valve comprises the three kinds of working staties controlling described first hydraulicdirectional control valve execution different operating state:
Under the first working state, the drain tap of described first solenoid directional control valve is communicated with the second control port with the first control port of described first hydraulicdirectional control valve with the second oil outlet respectively by the first oil outlet of described first solenoid directional control valve;
Under the second working state, the filler opening of described first solenoid directional control valve is communicated with the second control port of described first hydraulicdirectional control valve by the first oil outlet of described first solenoid directional control valve; The drain tap of described first solenoid directional control valve is communicated with the first control port of described first hydraulicdirectional control valve by the second oil outlet of described first solenoid directional control valve;
Under the third working state, the filler opening of described first solenoid directional control valve is communicated with the first control port of described first hydraulicdirectional control valve by the second oil outlet of described first solenoid directional control valve; The drain tap of described first solenoid directional control valve is communicated with the second control port of described first hydraulicdirectional control valve by the first oil outlet of described first solenoid directional control valve.
Further, described first solenoid directional control valve is three position four-way electromagnetic valve; And/or
Described first hydraulicdirectional control valve is 3-position 4-way hydraulic operated valve; And/or
Another load feedback oil circuit described is provided with the first one-way valve, and the filler opening of described first one-way valve is communicated with the oil outlet of described hydraulic control proportional flow control valve.
Further, described switch selector valve group comprises:
Oil-feed oil circuit;
Oil return circuit;
Load feedback oil circuit;
Draining oil circuit;
Working oil path; And
The series flow control valve be communicated with described oil-feed oil circuit, described series flow control valve, for regulating oil-feed oil circuit flow, makes the first actuating mechanism operating rate stablize;
Be communicated with described working oil path with described oil-feed oil circuit, described oil return circuit, described load feedback oil circuit, described draining oil circuit first commutates assembly, first commutation assembly carries out commutation by the oil circuit exported series flow control valve and regulates, to realize the control to working oil path.
Further, described load feedback oil circuit comprises the first reverse feedback oil pipe and the second reverse feedback oil pipe;
First feedback oil pipe of described load feedback oil circuit is provided with the second one-way valve, and the filler opening of described second one-way valve is communicated with the first hydraulic fluid port of described working oil path;
Second feedback oil pipe of described load feedback oil circuit is provided with the 3rd one-way valve, and the described filler opening of the 3rd one-way valve is communicated with the second hydraulic fluid port of described working oil path.
Further, described first commutation assembly comprises:
The the second hydraulic pressure reversing unit be communicated with described series flow control valve;
The solenoid directional control valve group be communicated with described second hydraulic pressure reversing unit.
Further, described solenoid directional control valve group comprises the second solenoid directional control valve and the 3rd solenoid directional control valve;
Described second hydraulic pressure reversing unit comprises:
5th logical valve, its first hydraulic fluid port is communicated with described series flow control valve oil outlet; Described second hydraulic fluid port of the 5th logical valve is communicated with the second hydraulic fluid port of described working oil path;
6th logical valve, its first hydraulic fluid port is communicated with described series flow control valve oil outlet; Described second hydraulic fluid port of the 6th logical valve is communicated with the first hydraulic fluid port of described working oil path;
7th logical valve, its first hydraulic fluid port is communicated with described oil return circuit; Described second hydraulic fluid port of the 7th logical valve is communicated with the second hydraulic fluid port of described working oil path;
8th logical valve, its first hydraulic fluid port is communicated with described oil return circuit; Described second hydraulic fluid port of the 8th logical valve is communicated with the first hydraulic fluid port of described working oil path; Wherein
Described second solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet, the filler opening of described second solenoid directional control valve is communicated with described oil-feed oil circuit, the drain tap of described second solenoid directional control valve is communicated with described draining oil circuit, and the first oil outlet of described second solenoid directional control valve is communicated with the control port of described 5th logical valve; Second oil outlet of described second solenoid directional control valve is communicated with the control port of described 7th logical valve; Described second solenoid directional control valve comprises two kinds of working staties:
Under the first working state, the filler opening of described second solenoid directional control valve is communicated with the control port of described 5th logical valve by the first oil outlet of described second solenoid directional control valve; The drain tap of described second solenoid directional control valve is communicated with the control port of described 7th logical valve by the second oil outlet of described second solenoid directional control valve;
Under the second working state, the filler opening of described second solenoid directional control valve is communicated with the control port of described 7th logical valve by the second oil outlet of described second solenoid directional control valve; The drain tap of described second solenoid directional control valve is communicated with the control port of described 5th logical valve by the first oil outlet of described second solenoid directional control valve;
Described 3rd solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet, and the filler opening of described 3rd solenoid directional control valve is communicated with described oil-feed oil circuit, and the drain tap of described 3rd solenoid directional control valve is communicated with described draining oil circuit; First oil outlet of described 3rd solenoid directional control valve is communicated with the control port of described 6th logical valve; Second oil outlet of described 3rd solenoid directional control valve is communicated with the control port of described 8th logical valve; Described 3rd solenoid directional control valve comprises and described 3rd solenoid directional control valve first working state of described second solenoid directional control valve first working state and the second working state collaborative work and the second working state, wherein,
Described 3rd solenoid directional control valve first working state comprises, and the filler opening of described 3rd solenoid directional control valve is communicated with the control port of described 6th logical valve by the first oil outlet of described 3rd solenoid directional control valve; The drain tap of described 3rd solenoid directional control valve is communicated with the control port of described 8th logical valve by the second oil outlet of described 3rd solenoid directional control valve;
Described 3rd solenoid directional control valve second working state comprises, and the filler opening of described 3rd solenoid directional control valve is communicated with the control port of described 8th logical valve by the second oil outlet of described 3rd solenoid directional control valve; The drain tap of described 3rd solenoid directional control valve is communicated with the control port of described 6th logical valve by the first oil outlet of described 3rd solenoid directional control valve.
Further, described second solenoid directional control valve is two-position four-way solenoid valve, and/or
Described 3rd solenoid directional control valve is two-position four-way solenoid valve.
Further, described switch selector valve group also comprises the second pilot pressure oil circuit;
Described solenoid directional control valve group comprises the 4th solenoid directional control valve;
Described second hydraulic pressure reversing unit comprises:
Second hydraulicdirectional control valve, comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of described second hydraulicdirectional control valve is communicated with described series flow control valve oil outlet; The return opening of described second hydraulicdirectional control valve is communicated with described oil return circuit; First oil outlet of described second hydraulicdirectional control valve is communicated with the second hydraulic fluid port with the first hydraulic fluid port of described working oil path respectively with the second oil outlet; Described second hydraulicdirectional control valve comprises three working staties:
In the first operative state, the first oil outlet of described second hydraulicdirectional control valve is communicated with the return opening of the second oil outlet with described second hydraulicdirectional control valve;
In a second operative state, the first oil outlet of described second hydraulicdirectional control valve is communicated with the filler opening of described second hydraulicdirectional control valve, and the second oil outlet of described second hydraulicdirectional control valve is communicated with the return opening of described second hydraulicdirectional control valve;
Under the 3rd working state, the first oil outlet of described second hydraulicdirectional control valve is communicated with the return opening of described second hydraulicdirectional control valve, and the second oil outlet of described second hydraulicdirectional control valve is communicated with the filler opening of described second hydraulicdirectional control valve;
Described 4th solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described 4th solenoid directional control valve is communicated with described second pilot pressure oil circuit or is communicated with described series flow control valve oil outlet, and the drain tap of described 4th solenoid directional control valve is communicated with described draining oil circuit; First oil outlet of described 4th solenoid directional control valve is communicated with the second control port with the first control port of described second hydraulicdirectional control valve respectively with the second oil outlet; Described 4th solenoid directional control valve comprises the three kinds of working staties controlling described second hydraulicdirectional control valve execution different operating state:
Under the first working state, the drain tap of described 4th solenoid directional control valve is communicated with the second control port with the first control port of described second hydraulicdirectional control valve with the second oil outlet respectively by the first oil outlet of described 4th solenoid directional control valve;
Under the second working state, the filler opening of described 4th solenoid directional control valve is communicated with the second control port of described second hydraulicdirectional control valve by the first oil outlet of described 4th solenoid directional control valve; The drain tap of described 4th solenoid directional control valve is communicated with the first control port of described second hydraulicdirectional control valve by the second oil outlet of described 4th solenoid directional control valve;
Under the third working state, the filler opening of described 4th solenoid directional control valve is communicated with the first control port of described second hydraulicdirectional control valve by the second oil outlet of described 4th solenoid directional control valve; The drain tap of described 4th solenoid directional control valve is communicated with the second control port of described second hydraulicdirectional control valve by the first oil outlet of described 4th solenoid directional control valve.
Further, described 4th solenoid directional control valve is three position four-way electromagnetic valve; And/or
Described second hydraulicdirectional control valve is 3-position 4-way hydraulic operated valve.
According to a further aspect in the invention, present invention also offers a kind of development machine, described development machine is provided with the hydraulic system described in above-mentioned any one.
Further, described second actuating mechanism comprises: cutterhead lifting, angling cylinder, running motor; Described first actuating mechanism comprises: shovel board and back support frame.
The invention provides a kind of hydraulic system, comprising: for controlling to need the proportional reversing valve group of the second actuating mechanism work of speed governing; For controlling the switch selector valve group of the first actuating mechanism work not needing speed governing.Actuating mechanism is divided into two classes, one class is the second actuating mechanism needing to regulate operating rate, second actuating mechanism passing ratio selector valve group controls, the second actuating mechanism can be regulated as required, another kind of is the first actuating mechanism not needing to regulate operating rate, first actuating mechanism is controlled by switch selector valve group, and realize the first actuating mechanism smooth working, the present invention effectively can solve the problem that existing hydraulic system reinstate rate is low, loop is complicated, element cost is high.
Accompanying drawing explanation
Fig. 1 is the hydraulic principle schematic diagram of proportional reversing valve prescription case one in the embodiment of the present invention;
Fig. 2 is the hydraulic principle schematic diagram of proportional reversing valve prescription case two in the embodiment of the present invention;
Fig. 3 is the hydraulic principle schematic diagram of embodiment of the present invention breaker in middle selector valve prescription case one;
Fig. 4 is the hydraulic principle schematic diagram of embodiment of the present invention breaker in middle selector valve prescription case two.
Description of reference numerals: 1, the first one-way valve; 11, the second one-way valve; 12, the 3rd one-way valve; 21, the first logical valve; 22, the second logical valve; 23, the 3rd logical valve; 24, the 4th logical valve; 25, the 5th logical valve; 26, the 6th logical valve; 27, the 7th logical valve; 28, the 8th logical valve; 3, solenoid-operated proportional reduction valve; 4, pressure compensator; 5, hydraulic control proportional flow control valve; 6, the first solenoid directional control valve; 61, the 4th solenoid directional control valve; 7, the second solenoid directional control valve; 71, the 3rd solenoid directional control valve; 8, series flow control valve; 9, the first hydraulicdirectional control valve; 91, the second hydraulicdirectional control valve.
Embodiment
In order to make those skilled in the art understand technological scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.To it should be pointed out that in this part to the description of concrete structure and description order it is only explanation to specific embodiment, should not be considered as there is any restriction to protection scope of the present invention.
Because the present invention is combined by proportional reversing valve group and switch selector valve group, and the proportional reversing valve group that the embodiment of the present invention provides and each two schemes of switch selector valve group; So can be combined into four kinds of embodiments of the invention, each scheme below mainly for proportional reversing valve group and switch selector valve group is described.
The invention provides a kind of hydraulic system, comprising: for controlling to need the proportional reversing valve group of the second actuating mechanism work of speed governing; For controlling the switch selector valve group of the first actuating mechanism work not needing speed governing.Actuating mechanism is divided into two classes, a class is the second actuating mechanism needing to regulate operating rate, and the second actuating mechanism passing ratio selector valve group controls, can by the operating rate regulating the throttle grverning element of proportional reversing valve group to regulate the second actuating mechanism.Another kind of is the first actuating mechanism not needing to regulate operating rate, and the first actuating mechanism is controlled by switch selector valve group, substantially can realize according to predetermined speed smooth motion, and its element cost needed is low, long service life; Whole actuating mechanism separately controls, and makes that hydraulic system efficiency is high, loop simple, and element cost is low.Can combine according to existing proportional reversing valve integral switch selector valve group, and separately hydraulic control is carried out to the second actuating mechanism and the first actuating mechanism,
Wherein, as shown in Figure 1, it is the principle schematic of proportional reversing valve prescription case one in figure, shown in figure a two proportional reversing valve group in parallel, solid line is transmission fluid force feed circuit, dotted line is hydraulic control oil circuit, and wherein each proportional reversing valve group comprises: another oil-feed oil circuit, and another oil-feed oil circuit is communicated with oil inlet P; First pilot pressure oil circuit, the first pilot pressure oil circuit is communicated with pilot pressure hydraulic fluid port P1; Another oil return circuit, another oil return circuit is communicated with oil return inlet T; Another load feedback oil circuit, the first feedback oil circuit is communicated with feedback hydraulic fluid port Ls; Another draining oil circuit, the first draining hydraulic fluid port is communicated with draining hydraulic fluid port T1; Another working oil path, another working oil path is communicated with actuator port A1 with B1; And the throttle grverning assembly to be communicated with another draining oil circuit with another oil-feed oil circuit, the first pilot pressure oil circuit; Throttle grverning assembly carries out throttle grverning control by the first pilot pressure oil circuit to another oil-feed oil circuit; With another oil return circuit, second commutating assembly of stating that another draining oil circuit, another working oil path and throttle grverning assembly be communicated with.Second commutation assembly carries out commutation by the oil circuit exported throttle grverning assembly and regulates, to realize the control to another working oil path.
Wherein throttle grverning assembly can be the conventional speed governing element in related domain, the commutation element that the second commutation assembly can be commonly used for related domain; Wherein, containing more impurity in the oil return of hydraulic system, throttle grverning assembly is set in oil return circuit, easily there is the faults such as spool clamping stagnation, the contamination resistance of system is poor, oil-feed place of hydraulic system of the present invention arranges throttle grverning group, does not arrange throttle grverning assembly at fuel-displaced place, improves hydraulic system contamination resistance.The speed governing element of hydraulic system is separated with commutation element, improves the stability of system.
As shown in Figure 1, throttle grverning assembly comprises: pressure compensator 4, hydraulic control proportional flow control valve 5 and solenoid-operated proportional reduction valve 3.
Wherein, pressure compensator 4 comprise filler opening, oil outlet, first compensate oil circuit and and second compensate oil circuit, the filler opening of pressure compensator is communicated with another oil-feed oil circuit described.
Hydraulic control proportional flow control valve 5 comprises filler opening, oil outlet, control port and drain tap, and first of described pressure compensator 4 compensates oil circuit and second and compensates oil circuit and be communicated with at the filler opening of described hydraulic control proportional flow control valve 5 and oil outlet respectively; The filler opening of described hydraulic control proportional flow control valve 5 is communicated with described pressure compensator oil outlet; The drain tap of described hydraulic control proportional flow control valve 5 is communicated with another draining oil circuit described;
Solenoid-operated proportional reduction valve 3 is for regulating hydraulic control proportional flow control valve 5 flow, solenoid-operated proportional reduction valve 3 comprises filler opening, oil outlet and Electromagnetic Control end, the filler opening of solenoid-operated proportional reduction valve 3 is communicated with the first pilot pressure oil circuit, the oil outlet of solenoid-operated proportional reduction valve 3 is communicated with the control port of hydraulic control proportional flow control valve, the Electromagnetic Control end external controller (not shown) of solenoid-operated proportional reduction valve 3; Solenoid-operated proportional reduction valve can the flow of fine adjustment hydraulic control proportional flow control valve.
In addition, the second commutation assembly comprises: the first hydraulic pressure reversing unit be communicated with described hydraulic control proportional flow control valve 5; The first solenoid directional control valve 6 be communicated with described first hydraulic pressure reversing unit.
As shown in Figure 1, the first hydraulic pressure reversing unit comprises: the first logical valve 21, and its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve 5 oil outlet, and the second hydraulic fluid port of the first logical valve 21 is communicated with the second hydraulic fluid port of another working oil path described; Second logical valve 22, its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve 5 oil outlet, and described second hydraulic fluid port of the second logical valve 22 is communicated with the first hydraulic fluid port of another working oil path described; 3rd logical valve 23, its first hydraulic fluid port is communicated with another oil return circuit described, and described second hydraulic fluid port of the 3rd logical valve 23 is communicated with the second hydraulic fluid port of another working oil path described; 4th logical valve 24, its first hydraulic fluid port is communicated with another oil return circuit described, and described second hydraulic fluid port of the 4th logical valve 24 is communicated with the first hydraulic fluid port of another working oil path described;
Wherein, the first solenoid directional control valve 6 comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of the first solenoid directional control valve 6 is communicated with hydraulic control proportional flow control valve 5 oil outlet, and the drain tap of the first solenoid directional control valve 6 is communicated with another draining oil circuit; First oil outlet of described first solenoid directional control valve 6 is communicated with the control port of described 4th logical valve 24 with the control port of described first logical valve 21; Second oil outlet of described first solenoid directional control valve 6 is communicated with the control port of described 3rd logical valve 23 with the control port of described second logical valve 22; First solenoid directional control valve 6 comprises three kinds of working staties:
Under the first working state, the drain tap of the first solenoid directional control valve 6 is communicated with the control port of the 4th logical valve 24 with the control port of the first logical valve 21, the control port of the second logical valve 22, the control port of the 3rd logical valve 23 respectively by the first oil outlet of described first solenoid directional control valve 6 and the second oil outlet.
Under the second working state, the filler opening of the first solenoid directional control valve 6 is communicated with the control port of the 4th logical valve 24 with the control port of the first logical valve 21 by the first oil outlet of the first solenoid directional control valve 6; The drain tap of the first solenoid directional control valve 6 is communicated with the control port of the 3rd logical valve 23 with the control port of the second logical valve 22 by the second oil outlet of the first solenoid directional control valve 6.
Under the third working state, the filler opening of the first solenoid directional control valve 6 is communicated with the control port of the 3rd logical valve 23 with the control port of the second logical valve 22 by the second oil outlet of the first solenoid directional control valve 6; The drain tap of the first solenoid directional control valve 6 is communicated with the control port of the 4th logical valve 24 with the control port of the first logical valve 21 by the first oil outlet of the first solenoid directional control valve 6.
In Fig. 1, the first solenoid directional control valve 6 is three position four-way electromagnetic valve; First solenoid directional control valve 6 is the first working state when being in meta, and A1, B1 oil hydraulic circuit is closed; First solenoid directional control valve 6 is the second working state when being in left position, and A1 mouth is the filler opening of actuator, and B1 mouth is the return opening of actuator; First solenoid directional control valve 6 is the 3rd working state when being in right position, and B1 mouth is the filler opening of actuator, and A1 mouth is the return opening of actuator.
In addition, if Fig. 2 is the principle schematic of proportional reversing valve prescription case two, in figure, throttle grverning modular construction is identical with the structure of scheme one, and the second commutation assembly comprises: the first hydraulic pressure reversing unit be communicated with described hydraulic control proportional flow control valve 5; The first solenoid directional control valve 6 be communicated with described hydraulic pressure reversing unit.
First hydraulic pressure reversing unit comprises: the first hydraulicdirectional control valve 9, and it comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of the first hydraulicdirectional control valve 9 is communicated with hydraulic control proportional flow control valve 5 oil outlet; The return opening of the first hydraulicdirectional control valve 9 is communicated with another oil return circuit; First oil outlet of described first hydraulicdirectional control valve 9 is communicated with the second hydraulic fluid port with the first hydraulic fluid port of another working oil path described respectively with the second oil outlet; First hydraulicdirectional control valve 9 comprises three working staties:
In the first operative state, the first oil outlet of the first hydraulicdirectional control valve 9 is communicated with the return opening of the second oil outlet with described first hydraulicdirectional control valve 9.
In a second operative state, under the 3rd working state, the first oil outlet of the first hydraulicdirectional control valve 9 is communicated with the filler opening of the first hydraulicdirectional control valve 9, and the second oil outlet of the first hydraulicdirectional control valve 9 is communicated with the return opening of the first hydraulicdirectional control valve 9.
Under the 3rd working state, the first oil outlet of the first hydraulicdirectional control valve 9 is communicated with the return opening of the first hydraulicdirectional control valve 9, and the second oil outlet of the first hydraulicdirectional control valve 9 is communicated with the filler opening of the first hydraulicdirectional control valve 9.
First solenoid directional control valve 6 comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of the first solenoid directional control valve 6 is communicated with described first pilot pressure oil circuit, and the drain tap of the first solenoid directional control valve 6 is communicated with another draining oil circuit described; First oil outlet of described first solenoid directional control valve 6 is communicated with the second control port with the first control port of described first hydraulicdirectional control valve 9 respectively with the second oil outlet; First solenoid directional control valve 6 comprises three kinds of working staties that described first hydraulicdirectional control valve 9 of control performs different operating state:
Under the first working state, the drain tap of described first solenoid directional control valve 6 is communicated with the second control port with the first control port of described first hydraulicdirectional control valve 9 with the second oil outlet respectively by the first oil outlet of described first solenoid directional control valve 6.
Under the second working state, the filler opening of the first solenoid directional control valve 6 is communicated with the second control port of the first hydraulicdirectional control valve 9 by the first oil outlet of the first solenoid directional control valve 6; The drain tap of the first solenoid directional control valve 6 is communicated with the first control port of the first hydraulicdirectional control valve 9 by the second oil outlet of the first solenoid directional control valve 6.
Under the third working state, the filler opening of described first solenoid directional control valve 6 is communicated with the first control port of described first hydraulicdirectional control valve 9 by the second oil outlet of described first solenoid directional control valve 6; The drain tap of the first solenoid directional control valve 6 is communicated with the second control port of described first hydraulicdirectional control valve 9 by the first oil outlet of described first solenoid directional control valve 6.
First solenoid directional control valve 6 controls the first hydraulicdirectional control valve 9 by the first control port and the second control port controlling the first hydraulicdirectional control valve 9 and enters different operating state, and as shown in Figure 2, the first solenoid directional control valve 6 is three position four-way electromagnetic valve; First hydraulicdirectional control valve 9 is 3-position 4-way hydraulic operated valve; Under first the first operating condition of solenoid directional control valve 6 (being in meta), the first hydraulicdirectional control valve 9 enters the first working state (being in meta), and A1, B1 oil hydraulic circuit is closed; Under first solenoid directional control valve 6 the second operating condition (being in upper), the first hydraulicdirectional control valve 9 enters the second working state (being in right position), and A1 mouth is the filler opening of actuator, and B1 mouth is the return opening of actuator; Under first the first operating condition of solenoid directional control valve 6 (being in bottom), the first hydraulicdirectional control valve 9 enters the 3rd working state (being in left position), and B1 mouth is the filler opening of actuator, and A1 mouth is the return opening of actuator.
Wherein, the filler opening of the first solenoid directional control valve 6 can also be communicated with another oil-feed oil circuit to replace connection first pilot pressure oil circuit, to realize the control to the first hydraulicdirectional control valve 9.Because first solenoid directional control valve 6 controls the first hydraulicdirectional control valve 9 by external oil circuit in scheme two, the oil pressure of needs is little, so the filler opening of the first solenoid directional control valve 6 can be communicated with another oil-feed oil circuit also can be communicated with the first pilot pressure oil circuit.
As shown in Figure 3, Fig. 3 is the structural principle schematic diagram of switch selector valve prescription case one, and figure comprises two switch selector valve groups, and wherein, a switch selector valve group comprises: oil-feed oil circuit, and oil-feed oil circuit is communicated with oil-feed hydraulic fluid port P; Oil return circuit, oil return circuit is communicated with oil return inlet T; Load feedback oil circuit, load feedback oil circuit is communicated with feedback hydraulic fluid port Ls; Draining oil circuit, draining oil circuit is communicated with drain tap T1; Working oil path, working oil path is communicated with actuator port A3 and B3, and the series flow control valve 8 be communicated with oil-feed oil circuit, and described series flow control valve 8, for regulating oil-feed oil circuit flow, makes the first actuating mechanism operating rate stablize; Be communicated with working oil path with oil-feed oil circuit, oil return circuit, load feedback oil circuit, draining oil circuit first commutates assembly, and the first commutation assembly carries out commutation adjustment, to realize the control to working oil path by the oil circuit exported series flow control valve 8.
Wherein, as shown in Figure 3, load feedback oil circuit comprises the first reverse feedback oil pipe and the second reverse feedback oil pipe; The filler opening first feedback oil pipe of load feedback oil circuit being provided with the second one-way valve 11, second one-way valve 11 is communicated with the first hydraulic fluid port of working oil path; The filler opening second feedback oil pipe of load feedback oil circuit being provided with the 3rd one-way valve the 12, three one-way valve 12 is communicated with the second oil circuit of described working oil path.By feedback oil circuit feedback pressure signal.
Wherein, as shown in Figure 3, the first commutation assembly comprises: the second hydraulic pressure reversing unit be communicated with described series flow control valve 8; The solenoid directional control valve group be communicated with described second hydraulic pressure reversing unit.
Solenoid directional control valve group comprises the second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71; Second hydraulic pressure reversing unit comprises: the 5th logical valve 25, and its first hydraulic fluid port is communicated with described series flow control valve 8 oil outlet; Described second hydraulic fluid port of the 5th logical valve 25 is communicated with the second hydraulic fluid port of described working oil path; 6th logical valve 26, its first hydraulic fluid port is communicated with described series flow control valve 8 oil outlet; Described second hydraulic fluid port of the 6th logical valve 26 is communicated with the first hydraulic fluid port of described working oil path; 7th logical valve 27, its first hydraulic fluid port is communicated with described oil return circuit; Described second hydraulic fluid port of the 7th logical valve 27 is communicated with the second hydraulic fluid port of described working oil path; 8th logical valve 28, its first hydraulic fluid port is communicated with described oil return circuit; Described second hydraulic fluid port of the 8th logical valve 28 is communicated with the first hydraulic fluid port of described working oil path.Wherein:
Second solenoid directional control valve 7 comprises filler opening, drain tap, the first oil outlet and the second oil outlet, and the filler opening of the second solenoid directional control valve 7 is communicated with described oil-feed oil circuit, and the drain tap of described second solenoid directional control valve 7 is communicated with described draining oil circuit; First oil outlet of described second solenoid directional control valve 7 is communicated with the control port of described 5th logical valve 25; Second oil outlet of described second solenoid directional control valve 7 is communicated with the control port of described 7th logical valve 27; Described second solenoid directional control valve 7 comprises two kinds of working staties:
Under the first working state, the filler opening of the second solenoid directional control valve 7 is communicated with the control port of the 5th logical valve 25 by the first oil outlet of the second solenoid directional control valve 7; The drain tap of the second solenoid directional control valve 7 is communicated with the control port of the 7th logical valve 27 by the second oil outlet of the second solenoid directional control valve 7.
Under the second working state, the filler opening of the second solenoid directional control valve 7 is communicated with the control port of the 7th logical valve 27 by the second oil outlet of the second solenoid directional control valve 7; The drain tap of the second solenoid directional control valve 7 is communicated with the control port of the 5th logical valve 25 by the first oil outlet of the second solenoid directional control valve 7.
3rd solenoid directional control valve 71 comprises filler opening, drain tap, the first oil outlet and the second oil outlet, and the filler opening of the 3rd solenoid directional control valve 71 is communicated with oil-feed oil circuit, and the drain tap of the 3rd solenoid directional control valve 71 is communicated with draining oil circuit; First oil outlet of described 3rd solenoid directional control valve 71 is communicated with the control port of described 6th logical valve 26; Second oil outlet of described 3rd solenoid directional control valve 71 is communicated with the control port of described 8th logical valve 28; 3rd solenoid directional control valve 71 comprises the 3rd solenoid directional control valve 71 first working state and the second working state with the second solenoid directional control valve 7 first working state and the second working state collaborative work, wherein,
3rd solenoid directional control valve 71 first working state comprises, and the filler opening of the 3rd solenoid directional control valve 71 is communicated with the control port of the 6th logical valve 26 by the first oil outlet of the 3rd solenoid directional control valve 71; The drain tap of the 3rd solenoid directional control valve 71 is communicated with the control port of described 8th logical valve 28 by the second oil outlet of described 3rd solenoid directional control valve 71.
3rd solenoid directional control valve 71 second working state comprises, and the filler opening of the 3rd solenoid directional control valve 71 is communicated with the control port of the 8th logical valve 28 by the second oil outlet of the 3rd solenoid directional control valve 71; The drain tap of the 3rd solenoid directional control valve 71 is communicated with the control port of described 6th logical valve 26 by the first oil outlet of the 3rd solenoid directional control valve 71.
As shown in Figure 3, solenoid directional control valve group comprises the second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71; Second solenoid directional control valve 7 is two-position four-way solenoid valve, and the 3rd solenoid directional control valve 71 is also two-position four-way solenoid valve; By the collaborative work of the second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71 different operating state, solenoid directional control valve group is made to keep three kinds of different working staties, wherein, first working state of solenoid directional control valve group is, the collaborative work of the first working state of the second solenoid directional control valve 7 and the first working state of the 3rd solenoid directional control valve 71, now A3, B3 oil hydraulic circuit is closed; Second working state of solenoid directional control valve group is, the collaborative work of the second working state of the second solenoid directional control valve 7 and the first working state of the 3rd solenoid directional control valve 71, and B3 now mouth is the filler opening of actuator, and A3 mouth is the return opening of actuator; 3rd working state of solenoid directional control valve group is, the collaborative work of the first working state of the second solenoid directional control valve 7 and the first working state of the 3rd solenoid directional control valve 71, and A3 mouth is the filler opening of actuator, and B3 mouth is the return opening of actuator.
As shown in Figure 4, figure is the principle schematic of switch selector valve prescription case two, and series flow control valve 8 structure of figure breaker in middle selector valve group is constant, and the first commutation assembly comprises: the second hydraulic pressure reversing unit be communicated with described series flow control valve 8; The solenoid directional control valve group be communicated with described second hydraulic pressure reversing unit.
Wherein, switch selector valve group also comprises the second pilot pressure oil circuit; Solenoid directional control valve group comprises the 4th solenoid directional control valve 61; Second hydraulic pressure reversing unit comprises: the second hydraulicdirectional control valve 91, comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of the second hydraulicdirectional control valve 91 is communicated with described series flow control valve 8 oil outlet; The return opening of the second hydraulicdirectional control valve 91 is communicated with described oil return circuit; First oil outlet of described second hydraulicdirectional control valve 91 is communicated with the second hydraulic fluid port with the first hydraulic fluid port of another working oil path described respectively with the second oil outlet; Described second hydraulicdirectional control valve 91 comprises three working staties:
In the first operative state, the first oil outlet of the second hydraulicdirectional control valve 91 is communicated with the return opening of the second oil outlet with described second hydraulicdirectional control valve 91.
In a second operative state, the first oil outlet of the second hydraulicdirectional control valve 91 is communicated with the filler opening of described second hydraulicdirectional control valve 91, and the second oil outlet of the second hydraulicdirectional control valve 91 is communicated with the return opening of described second hydraulicdirectional control valve 91.
Under the 3rd working state, the first oil outlet of the second hydraulicdirectional control valve 91 is communicated with the return opening of described second hydraulicdirectional control valve 91, and the second oil outlet of described second hydraulicdirectional control valve 91 is communicated with the filler opening of described second hydraulicdirectional control valve 91.
4th solenoid directional control valve 61 comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of the 4th solenoid directional control valve 61 is communicated with the second pilot pressure oil circuit, and the drain tap of the 4th solenoid directional control valve 61 is communicated with described draining oil circuit; First oil outlet of described 4th solenoid directional control valve 61 is communicated with the second control port with the first control port of described second hydraulicdirectional control valve 91 respectively with the second oil outlet; 4th solenoid directional control valve 61 comprises three kinds of working staties that described second hydraulicdirectional control valve 91 of control performs different operating state:
Under the first working state, the drain tap of the 4th solenoid directional control valve 61 is communicated with the second control port with the first control port of the second hydraulicdirectional control valve 91 with the second oil outlet respectively by the first oil outlet of the 4th solenoid directional control valve 61;
Under the second working state, the filler opening of the 4th solenoid directional control valve 61 is communicated with the second control port of described second hydraulicdirectional control valve 91 by the first oil outlet of described 4th solenoid directional control valve 61; The drain tap of described 4th solenoid directional control valve 61 is communicated with the first control port of described second hydraulicdirectional control valve 91 by the second oil outlet of described 4th solenoid directional control valve 61;
Under the third working state, the filler opening of the 4th solenoid directional control valve 61 is communicated with the first control port of described second hydraulicdirectional control valve 91 by the second oil outlet of described 4th solenoid directional control valve 61; The drain tap of described 4th solenoid directional control valve 61 is communicated with the second control port of described second hydraulicdirectional control valve 91 by the first oil outlet of described 4th solenoid directional control valve 61.
4th solenoid directional control valve 61 controls the second hydraulicdirectional control valve 91 by the first control port and the second control port controlling the second hydraulicdirectional control valve 91 and enters different operating state, and as shown in Figure 2, the 4th solenoid directional control valve 61 is three position four-way electromagnetic valve; Second hydraulicdirectional control valve 91 is 3-position 4-way hydraulic operated valve; (being in meta) (orientation is as the criterion with direction shown in scheming) under the 4th the first operating condition of solenoid directional control valve 61, second hydraulicdirectional control valve 91 enters the first working state (being in meta), and A3, B3 oil hydraulic circuit is closed; Under the 4th solenoid directional control valve 61 the second operating condition (being in upper), the second hydraulicdirectional control valve 91 enters the second working state (being in right position), and A3 mouth is the filler opening of actuator, and B3 mouth is the return opening of actuator; Under the 4th the first operating condition of solenoid directional control valve 61 (being in bottom), the second hydraulicdirectional control valve 91 enters the 3rd working state (being in left position), and B3 mouth is the filler opening of actuator, and A3 mouth is the return opening of actuator.
4th solenoid directional control valve 61 filler opening can also be communicated with oil-feed oil circuit to replace connection the 4th pilot pressure oil circuit, to realize the control to the second hydraulicdirectional control valve 91.Because the 4th solenoid directional control valve 61 filler opening controls the second hydraulicdirectional control valve 91 by external oil circuit in embodiment two, the oil pressure of needs is little, so the 4th solenoid directional control valve 61 can be communicated with oil-feed oil circuit also can be communicated with the second pilot pressure oil circuit.
The embodiment of the present invention one is, proportion of utilization selector valve group (scheme one) and switch selector valve group (scheme one) combine, it specifically forms the proportional reversing valve group (scheme one) in structure and illustrates in the above-described embodiments with the structure of switch selector valve group (scheme one), does not repeat them here.
The embodiment of the present invention two is, proportion of utilization selector valve group (scheme one) and switch selector valve group (scheme two) combine, it specifically forms the proportional reversing valve group (scheme one) in structure and illustrates in the above-described embodiments with the structure of switch selector valve group (scheme two), does not repeat them here.
The embodiment of the present invention three is, proportion of utilization selector valve group (scheme two) and switch selector valve group (scheme one) combine, it specifically forms the proportional reversing valve group (scheme two) in structure and illustrates in the above-described embodiments with the structure of switch selector valve group (scheme one), does not repeat them here.
The embodiment of the present invention four is, proportion of utilization selector valve group (scheme two) and switch selector valve group (scheme two) combine, it specifically forms the proportional reversing valve group (scheme two) in structure and illustrates in the above-described embodiments with the structure of switch selector valve group (scheme two), does not repeat them here.。
Its concrete principle is as follows:
The main hydraulic control section of hydraulic system adopts concentrates valve block mode.The oil hydraulic circuit quantity of valve block is concentrated to determine according to the quantity of corresponding actuator.There is the principle of the proportional reversing valve prescription case one of two oil hydraulic circuits as shown in Figure 1, each proportional reversing valve group comprises the first one-way valve 1, logical valve 2, solenoid-operated proportional reduction valve 3, pressure compensator 4, hydraulic control proportional flow control valve 5, first solenoid directional control valve 6, its external hydraulic fluid port load feedback hydraulic fluid port LS, pilot pressure hydraulic fluid port P1, main oil inlet P, main oil return inlet T, drain tap T1, actuator port A1, B1.
The working principle of proportional reversing valve prescription case one is as follows:
As shown in Figure 1, in figure, solid line is transmission fluid force feed circuit, dotted line is hydraulic control oil circuit, high pressure oil through oil hydraulic pump output arrives the oil inlet P of proportional reversing valve group after filter, hydraulic oil flow to pressure compensator 4 filler opening in each loop of proportional reversing valve group, pressure compensator 4 determines the pressure drop of hydraulic control proportional flow control valve 5 filler opening and oil outlet, thus make the flow flowing through hydraulic control proportional flow control valve 5 only relevant to the delivery pressure of solenoid-operated proportional reduction valve 3, the delivery pressure of solenoid-operated proportional reduction valve 3 is determined by input current, thus make hydraulic system have good proportional control characteristic.
Four logical valves (the first logical valve 21, second logical valve 22, the 3rd logical valve 23 and the 4th logical valve 24) and first solenoid directional control valve 6 form switch type hydraulicdirectional control valve, the hydraulic oil that hydraulic control proportional flow control valve 5 exports, by logical valve, is controlled the break-make of four logical valves by the first solenoid directional control valve 6.When first solenoid directional control valve 6 is in meta (orientation is as the criterion with direction shown in scheming), four logical valve Close Alls, oil hydraulic circuit is closed.When the first solenoid directional control valve 6 is in left position, the second logical valve 22 and the 3rd logical valve 23 conducting, A1 mouth is the filler opening of actuator, and B1 mouth is the return opening of actuator.When the first solenoid directional control valve 6 is in right position, the first logical valve 21 and the 4th logical valve 24 conducting, B1 mouth is the filler opening of actuator, and A1 mouth is the return opening of actuator.
First one-way valve 1 filler opening is connected with the oil outlet of hydraulic control proportional flow control valve 5, for obtaining the Maximum operating pressure of different actuators oil hydraulic circuit, as LS feedback pressure signal.
Have the principle of the switch selector valve prescription case one in two loops as shown in Figure 2, each switch selector valve group comprises the second one-way valve 11, the 3rd one-way valve 12; Four logical valves (the 5th logical valve 25, the 6th logical valve 26, the 7th logical valve 27 and the 8th logical valve 28), the second solenoid directional control valve 7, the 3rd solenoid directional control valve 71, series flow control valve 8.Its external hydraulic fluid port comprises load feedback hydraulic fluid port LS, oil inlet P, oil return inlet T, drain tap T1, actuator port A3, B3.
Scheme one working principle of switch selector valve group is as follows:
As shown in Figure 3, in figure, solid line is transmission fluid force feed circuit, dotted line is hydraulic control oil circuit, high pressure oil through oil hydraulic pump output arrives the oil inlet P of switch selector valve group after filter, hydraulic oil flow to the series flow control valve 8 of switch selector valve group, each oil hydraulic circuit uninterrupted is regulated by series flow control valve 8, thus determines the movement velocity of respective execution mechanisms.
The commutation of oil hydraulic circuit is completed by four logical valves (the 5th logical valve 25, the 6th logical valve 26, the 7th logical valve 27 and the 8th logical valve 28) and two solenoid directional control valves (the second solenoid directional control valve 7, the 3rd solenoid directional control valve 71), when two solenoid directional control valves while during no electric circuit, oil hydraulic circuit is closed.When the second solenoid directional control valve 7 be energized, the 3rd solenoid directional control valve 71 no electric circuit time, the 5th logical valve 25 and the 8th logical valve 28 conducting, B3 mouth is the filler opening of actuator, and A3 mouth is the return opening of actuator.When the 3rd solenoid directional control valve 71 be energized, the second solenoid directional control valve 7 no electric circuit time, the 6th logical valve 26 and the 7th logical valve 27 conducting, A3 mouth is the filler opening of actuator, and B3 mouth is the return opening of actuator.
First one-way valve 1 is connected with actuator port A3, B3 of actuator, for obtaining the Maximum operating pressure of different actuators oil hydraulic circuit, as LS feedback pressure signal respectively with the second one-way valve 11 oil-feed port.
As shown in Figure 2, proportional reversing valve group replaces four logical valves with the first hydraulicdirectional control valve 9 in scheme two, can realize the commutation function of oil hydraulic circuit equally.Its concrete principle is:
As shown in Figure 2, in figure, solid line is transmission fluid force feed circuit, dotted line is hydraulic control oil circuit, high pressure oil through oil hydraulic pump output arrives the first oil inlet P of proportional reversing valve group after filter, hydraulic oil flow to pressure compensator 4 filler opening in each loop of proportional reversing valve group, pressure compensator 4 determines the pressure drop of hydraulic control proportional flow control valve 5 filler opening and oil outlet, thus make the flow flowing through hydraulic control proportional flow control valve 5 only relevant to the delivery pressure of solenoid-operated proportional reduction valve 3, the delivery pressure of solenoid-operated proportional reduction valve 3 is determined by input current, thus make hydraulic system have good proportional control characteristic.
The commutation of oil hydraulic circuit controls the first hydraulicdirectional control valve 9 by the first solenoid directional control valve 6 and realizes, and when the first solenoid directional control valve 6 is in meta (orientation is as the criterion with direction shown in scheming), the first hydraulicdirectional control valve 9 is in meta, and oil hydraulic circuit is closed.When the first solenoid directional control valve 6 is in upper, the first hydraulicdirectional control valve 9 is in right position, and A1 mouth is the filler opening of actuator, and B1 mouth is the return opening of actuator.When the first solenoid directional control valve 6 is in bottom, the first hydraulicdirectional control valve 9 is in left position, and B1 mouth is the filler opening of actuator, and A1 mouth is the return opening of actuator.
As shown in Figure 4, replace four logical valves with the second hydraulicdirectional control valve 91 in switch selector valve prescription case two, the commutation function of oil hydraulic circuit can be realized equally.Its concrete principle is:
As shown in Figure 4, in figure, solid line is transmission fluid force feed circuit, dotted line is hydraulic control oil circuit, high pressure oil through oil hydraulic pump output arrives the oil inlet P of switch selector valve group after filter, hydraulic oil flow to the series flow control valve 8 of switch selector valve group, each oil hydraulic circuit uninterrupted is regulated by series flow control valve 8, thus determines the movement velocity of respective execution mechanisms.
The commutation of oil hydraulic circuit controls the second hydraulicdirectional control valve 91 by the second solenoid directional control valve 7 and realizes, and when the second solenoid directional control valve 7 is in meta (orientation is as the criterion with direction shown in scheming), the second hydraulicdirectional control valve 91 is in meta, and oil hydraulic circuit is closed.When the second solenoid directional control valve 7 is in upper, the second hydraulicdirectional control valve 91 is in right position, and A3 mouth is the filler opening of actuator, and B3 mouth is the return opening of actuator.When the second solenoid directional control valve 7 is in bottom, the second hydraulicdirectional control valve 91 is in left position, and B3 mouth is the filler opening of actuator, and A3 mouth is the return opening of actuator.
The embodiment of the present invention additionally provides a kind of development machine, development machine is provided with above-mentioned hydraulic system.Because above-mentioned hydraulic system has above-mentioned technique effect, therefore, the development machine being provided with this hydraulic system also should possess corresponding technique effect, and the structure of other parts is similar to the above embodiments; Its specific implementation process is similar to the above embodiments, does not hereby repeat.
Wherein in development machine, the second actuating mechanism comprises: cutterhead lifting, angling cylinder, running motor; First actuating mechanism comprises: shovel board and back support frame.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (15)

1. a hydraulic system, is characterized in that, comprising:
For controlling the proportional reversing valve group of the second actuating mechanism work needing speed governing;
For controlling the switch selector valve group of the first actuating mechanism work not needing speed governing; Wherein,
Described switch selector valve group comprises:
Oil-feed oil circuit;
Oil return circuit;
Load feedback oil circuit;
Draining oil circuit;
Working oil path; And
The series flow control valve (8) be communicated with described oil-feed oil circuit, described series flow control valve (8), for regulating oil-feed oil circuit flow, makes the first actuating mechanism operating rate stablize;
Be communicated with described working oil path with described oil-feed oil circuit, described oil return circuit, described load feedback oil circuit, described draining oil circuit first commutates assembly, first commutation assembly carries out commutation by the oil circuit exported series flow control valve (8) and regulates, to realize the control to working oil path.
2. hydraulic system according to claim 1, it is characterized in that, described proportional reversing valve group comprises:
Another oil-feed oil circuit;
First pilot pressure oil circuit;
Another oil return circuit;
Another load feedback oil circuit;
Another draining oil circuit;
Another working oil path; And,
The throttle grverning assembly be communicated with another draining oil circuit described with another oil-feed oil circuit described, described first pilot pressure oil circuit; Throttle grverning assembly carries out throttle grverning control by the first pilot pressure oil circuit to another oil-feed oil circuit;
Be communicated with described throttle grverning assembly with another oil return circuit described, another draining oil circuit described, another working oil path described second commutates assembly; Second commutation assembly carries out commutation by the oil circuit exported throttle grverning assembly and regulates, to realize the control to another working oil path.
3. hydraulic system according to claim 2, it is characterized in that, described throttle grverning assembly comprises:
Pressure compensator (4), described pressure compensator (4) comprises filler opening, oil outlet, first compensates oil circuit and second and compensates oil circuit, and the filler opening of described pressure compensator is communicated with another oil-feed oil circuit described;
Hydraulic control proportional flow control valve (5), described hydraulic control proportional flow control valve (5) comprises filler opening, oil outlet, control port and drain tap, and first of described pressure compensator (4) compensates oil circuit and second and compensates oil circuit and be communicated with at the filler opening of described hydraulic control proportional flow control valve (5) and oil outlet respectively; The filler opening of described hydraulic control proportional flow control valve (5) is communicated with described pressure compensator oil outlet; The drain tap of described hydraulic control proportional flow control valve (5) is communicated with another draining oil circuit described;
For regulating the solenoid-operated proportional reduction valve (3) of described hydraulic control proportional flow control valve (5) flow; Described solenoid-operated proportional reduction valve (3) comprises filler opening, oil outlet and Electromagnetic Control end, the filler opening of described solenoid-operated proportional reduction valve (3) is communicated with described first pilot pressure oil circuit, the oil outlet of described solenoid-operated proportional reduction valve (3) is communicated with the control port of described hydraulic control proportional flow control valve, the Electromagnetic Control end external controller of described solenoid-operated proportional reduction valve (3).
4. hydraulic system according to claim 3, is characterized in that, described second commutation assembly comprises:
The the first hydraulic pressure reversing unit be communicated with described hydraulic control proportional flow control valve (5) oil outlet;
The first solenoid directional control valve (6) be communicated with described first hydraulic pressure reversing unit.
5. hydraulic system according to claim 4, it is characterized in that, described first hydraulic pressure reversing unit comprises:
First logical valve (21), its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve (5) oil outlet, and described second hydraulic fluid port of the first logical valve (21) is communicated with the second hydraulic fluid port of another working oil path described;
Second logical valve (22), its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve (5) oil outlet, and described second hydraulic fluid port of the second logical valve (22) is communicated with the first hydraulic fluid port of another working oil path described;
3rd logical valve (23), its first hydraulic fluid port is communicated with another oil return circuit described, and the second hydraulic fluid port of described 3rd logical valve (23) is communicated with the second hydraulic fluid port of another working oil path described;
4th logical valve (24), its first hydraulic fluid port is communicated with another oil return circuit described, and the second hydraulic fluid port of described 4th logical valve (24) is communicated with the first hydraulic fluid port of another working oil path described; Wherein
Described first solenoid directional control valve (6) comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described first solenoid directional control valve (6) is communicated with described hydraulic control proportional flow control valve (5) oil outlet, and the drain tap of described first solenoid directional control valve (6) is communicated with another draining oil circuit described; First oil outlet of described first solenoid directional control valve (6) is communicated with the control port of the control port of described first logical valve (21) with described 4th logical valve (24); Second oil outlet of described first solenoid directional control valve (6) is communicated with the control port of the control port of described second logical valve (22) with described 3rd logical valve (23); Described first solenoid directional control valve (6) comprises three kinds of working staties:
Under the first working state, the drain tap of described first solenoid directional control valve (6) is communicated with the control port of described 4th logical valve (24) with the control port of described first logical valve (21), the control port of described second logical valve (22), the control port of described 3rd logical valve (23) respectively by the first oil outlet of described first solenoid directional control valve (6) and the second oil outlet;
Under the second working state, the filler opening of described first solenoid directional control valve (6) is communicated with the control port of the control port of described first logical valve (21) with described 4th logical valve (24) by the first oil outlet of described first solenoid directional control valve (6); The drain tap of described first solenoid directional control valve (6) is communicated with the control port of the control port of described second logical valve (22) with described 3rd logical valve (23) by the second oil outlet of described first solenoid directional control valve (6);
Under the third working state, the filler opening of described first solenoid directional control valve (6) is communicated with the control port of the control port of described second logical valve (22) with described 3rd logical valve (23) by the second oil outlet of described first solenoid directional control valve (6); The drain tap of described first solenoid directional control valve (6) is communicated with the control port of the control port of described first logical valve (21) with described 4th logical valve (24) by the first oil outlet of described first solenoid directional control valve (6).
6. hydraulic system according to claim 4, it is characterized in that, described first hydraulic pressure reversing unit comprises:
First hydraulicdirectional control valve (9), comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of described first hydraulicdirectional control valve (9) is communicated with described hydraulic control proportional flow control valve (5) oil outlet; The return opening of described first hydraulicdirectional control valve (9) is communicated with another oil return circuit described; First oil outlet of described first hydraulicdirectional control valve (9) is communicated with the second hydraulic fluid port with the first hydraulic fluid port of another working oil path described respectively with the second oil outlet; Described first hydraulicdirectional control valve (9) comprises three working staties:
In the first operative state, the first oil outlet of described first hydraulicdirectional control valve (9) is communicated with the return opening of the second oil outlet with described first hydraulicdirectional control valve (9);
In a second operative state, first oil outlet of described first hydraulicdirectional control valve (9) is communicated with the filler opening of described first hydraulicdirectional control valve (9), and the second oil outlet of described first hydraulicdirectional control valve (9) is communicated with the return opening of described first hydraulicdirectional control valve (9);
Under the 3rd working state, first oil outlet of described first hydraulicdirectional control valve (9) is communicated with the return opening of described first hydraulicdirectional control valve (9), and the second oil outlet of described first hydraulicdirectional control valve (9) is communicated with the filler opening of described first hydraulicdirectional control valve (9);
Described first solenoid directional control valve (6) comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described first solenoid directional control valve (6) is communicated with described first pilot pressure oil circuit or is communicated with described hydraulic control proportional flow control valve (5) oil outlet, and the drain tap of described first solenoid directional control valve (6) is communicated with another draining oil circuit described; First oil outlet of described first solenoid directional control valve (6) is communicated with the second control port with the first control port of described first hydraulicdirectional control valve (9) respectively with the second oil outlet; Described first solenoid directional control valve (6) comprises the three kinds of working staties controlling described first hydraulicdirectional control valve (9) execution different operating state:
Under the first working state, the drain tap of described first solenoid directional control valve (6) is communicated with the second control port with the first control port of described first hydraulicdirectional control valve (9) with the second oil outlet respectively by the first oil outlet of described first solenoid directional control valve (6);
Under the second working state, the filler opening of described first solenoid directional control valve (6) is communicated with the second control port of described first hydraulicdirectional control valve (9) by the first oil outlet of described first solenoid directional control valve (6); The drain tap of described first solenoid directional control valve (6) is communicated with the first control port of described first hydraulicdirectional control valve (9) by the second oil outlet of described first solenoid directional control valve (6);
Under the third working state, the filler opening of described first solenoid directional control valve (6) is communicated with the first control port of described first hydraulicdirectional control valve (9) by the second oil outlet of described first solenoid directional control valve (6); The drain tap of described first solenoid directional control valve (6) is communicated with the second control port of described first hydraulicdirectional control valve (9) by the first oil outlet of described first solenoid directional control valve (6).
7. hydraulic system according to claim 6, it is characterized in that, described first solenoid directional control valve (6) is three position four-way electromagnetic valve; And/or
Described first hydraulicdirectional control valve (9) is 3-position 4-way hydraulic operated valve; And/or
Another load feedback oil circuit described is provided with the first one-way valve (1), and the filler opening of described first one-way valve (1) is communicated with the oil outlet of described hydraulic control proportional flow control valve (5).
8. hydraulic system according to any one of claim 1-7, is characterized in that, described load feedback oil circuit comprises the first feedback oil pipe and the second feedback oil pipe;
First feedback oil pipe of described load feedback oil circuit is provided with the second one-way valve (11), and the filler opening of described second one-way valve is communicated with the first hydraulic fluid port of described working oil path;
Second feedback oil pipe of described load feedback oil circuit is provided with the 3rd one-way valve (12), and the described filler opening of the 3rd one-way valve is communicated with the second hydraulic fluid port of described working oil path.
9. hydraulic system according to claim 8, is characterized in that, described first commutation assembly comprises:
The the second hydraulic pressure reversing unit be communicated with described series flow control valve (8);
The solenoid directional control valve group be communicated with described second hydraulic pressure reversing unit.
10. hydraulic system according to claim 9, it is characterized in that, described solenoid directional control valve group comprises the second solenoid directional control valve (7) and the 3rd solenoid directional control valve (71);
Described second hydraulic pressure reversing unit comprises:
5th logical valve (25), its first hydraulic fluid port is communicated with described series flow control valve (8) oil outlet; Second hydraulic fluid port of described 5th logical valve (25) is communicated with the second hydraulic fluid port of described working oil path;
6th logical valve (26), its first hydraulic fluid port is communicated with described series flow control valve (8) oil outlet; Second hydraulic fluid port of described 6th logical valve (26) is communicated with the first hydraulic fluid port of described working oil path;
7th logical valve (27), its first hydraulic fluid port is communicated with described oil return circuit; Second hydraulic fluid port of described 7th logical valve (27) is communicated with the second hydraulic fluid port of described working oil path;
8th logical valve (28), its first hydraulic fluid port is communicated with described oil return circuit; Second hydraulic fluid port of described 8th logical valve (28) is communicated with the first hydraulic fluid port of described working oil path; Wherein
Described second solenoid directional control valve (7) comprises filler opening, drain tap, the first oil outlet and the second oil outlet, the filler opening of described second solenoid directional control valve (7) is communicated with described oil-feed oil circuit, the drain tap of described second solenoid directional control valve (7) is communicated with described draining oil circuit, and the first oil outlet of described second solenoid directional control valve (7) is communicated with the control port of described 5th logical valve (25); Second oil outlet of described second solenoid directional control valve (7) is communicated with the control port of described 7th logical valve (27); Described second solenoid directional control valve (7) comprises two kinds of working staties:
Under the first working state, the filler opening of described second solenoid directional control valve (7) is communicated with the control port of described 5th logical valve (25) by the first oil outlet of described second solenoid directional control valve (7); The drain tap of described second solenoid directional control valve (7) is communicated with the control port of described 7th logical valve (27) by the second oil outlet of described second solenoid directional control valve (7);
Under the second working state, the filler opening of described second solenoid directional control valve (7) is communicated with the control port of described 7th logical valve (27) by the second oil outlet of described second solenoid directional control valve (7); The drain tap of described second solenoid directional control valve (7) is communicated with the control port of described 5th logical valve (25) by the first oil outlet of described second solenoid directional control valve (7);
Described 3rd solenoid directional control valve (71) comprises filler opening, drain tap, the first oil outlet and the second oil outlet, the filler opening of described 3rd solenoid directional control valve (71) is communicated with described oil-feed oil circuit, and the drain tap of described 3rd solenoid directional control valve (71) is communicated with described draining oil circuit; First oil outlet of described 3rd solenoid directional control valve (71) is communicated with the control port of described 6th logical valve (26); Second oil outlet of described 3rd solenoid directional control valve (71) is communicated with the control port of described 8th logical valve (28); Described 3rd solenoid directional control valve (71) comprises described 3rd solenoid directional control valve (71) first working state and the second working state with described second solenoid directional control valve (7) first working state and the second working state collaborative work, wherein
Described 3rd solenoid directional control valve (71) first working state comprises, and the filler opening of described 3rd solenoid directional control valve (71) is communicated with the control port of described 6th logical valve (26) by the first oil outlet of described 3rd solenoid directional control valve (71); The drain tap of described 3rd solenoid directional control valve (71) is communicated with the control port of described 8th logical valve (28) by the second oil outlet of described 3rd solenoid directional control valve (71);
Described 3rd solenoid directional control valve (71) second working state comprises, and the filler opening of described 3rd solenoid directional control valve (71) is communicated with the control port of described 8th logical valve (28) by the second oil outlet of described 3rd solenoid directional control valve (71); The drain tap of described 3rd solenoid directional control valve (71) is communicated with the control port of described 6th logical valve (26) by the first oil outlet of described 3rd solenoid directional control valve (71).
11. hydraulic systems according to claim 10, it is characterized in that, described second solenoid directional control valve (7) is two-position four-way solenoid valve, and/or
Described 3rd solenoid directional control valve (71) is two-position four-way solenoid valve.
12. hydraulic systems according to claim 9, is characterized in that,
Described switch selector valve group also comprises the second pilot pressure oil circuit;
Described solenoid directional control valve group comprises the 4th solenoid directional control valve (61);
Described second hydraulic pressure reversing unit comprises:
Second hydraulicdirectional control valve (91), comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of described second hydraulicdirectional control valve (91) is communicated with described series flow control valve (8) oil outlet; The return opening of described second hydraulicdirectional control valve (91) is communicated with described oil return circuit; First oil outlet of described second hydraulicdirectional control valve (91) is communicated with the second hydraulic fluid port with the first hydraulic fluid port of described working oil path respectively with the second oil outlet; Described second hydraulicdirectional control valve (91) comprises three working staties:
In the first operative state, the first oil outlet of described second hydraulicdirectional control valve (91) is communicated with the return opening of the second oil outlet with described second hydraulicdirectional control valve (91);
In a second operative state, first oil outlet of described second hydraulicdirectional control valve (91) is communicated with the filler opening of described second hydraulicdirectional control valve (91), and the second oil outlet of described second hydraulicdirectional control valve (91) is communicated with the return opening of described second hydraulicdirectional control valve (91);
Under the 3rd working state, first oil outlet of described second hydraulicdirectional control valve (91) is communicated with the return opening of described second hydraulicdirectional control valve (91), and the second oil outlet of described second hydraulicdirectional control valve (91) is communicated with the filler opening of described second hydraulicdirectional control valve (91);
Described 4th solenoid directional control valve (61) comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described 4th solenoid directional control valve (61) is communicated with described second pilot pressure oil circuit or is communicated with described series flow control valve (8) oil outlet, and the drain tap of described 4th solenoid directional control valve (61) is communicated with described draining oil circuit; First oil outlet of described 4th solenoid directional control valve (61) is communicated with the second control port with the first control port of described second hydraulicdirectional control valve (91) respectively with the second oil outlet; Described 4th solenoid directional control valve (61) comprises the three kinds of working staties controlling described second hydraulicdirectional control valve (91) execution different operating state:
Under the first working state, the drain tap of described 4th solenoid directional control valve (61) is communicated with the second control port with the first control port of described second hydraulicdirectional control valve (91) with the second oil outlet respectively by the first oil outlet of described 4th solenoid directional control valve (61);
Under the second working state, the filler opening of described 4th solenoid directional control valve (61) is communicated with the second control port of described second hydraulicdirectional control valve (91) by the first oil outlet of described 4th solenoid directional control valve (61); The drain tap of described 4th solenoid directional control valve (61) is communicated with the first control port of described second hydraulicdirectional control valve (91) by the second oil outlet of described 4th solenoid directional control valve (61);
Under the third working state, the filler opening of described 4th solenoid directional control valve (61) is communicated with the first control port of described second hydraulicdirectional control valve (91) by the second oil outlet of described 4th solenoid directional control valve (61); The drain tap of described 4th solenoid directional control valve (61) is communicated with the second control port of described second hydraulicdirectional control valve (91) by the first oil outlet of described 4th solenoid directional control valve (61).
13., according to hydraulic system described in claim 12, is characterized in that, described 4th solenoid directional control valve (61) is three position four-way electromagnetic valve; And/or
Described second hydraulicdirectional control valve (91) is 3-position 4-way hydraulic operated valve.
14. 1 kinds of development machines, is characterized in that, described development machine is provided with hydraulic system described in any one of claim 1-13.
15., according to development machine described in claim 14, is characterized in that, described second actuating mechanism comprises: cutterhead lifting unit, angling cylinder, running motor;
Described first actuating mechanism comprises: shovel board and back support frame.
CN201210225278.XA 2012-07-02 2012-07-02 A kind of hydraulic system and development machine Expired - Fee Related CN102748335B (en)

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