CN102748335A - Hydraulic system and heading machine - Google Patents

Hydraulic system and heading machine Download PDF

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Publication number
CN102748335A
CN102748335A CN201210225278XA CN201210225278A CN102748335A CN 102748335 A CN102748335 A CN 102748335A CN 201210225278X A CN201210225278X A CN 201210225278XA CN 201210225278 A CN201210225278 A CN 201210225278A CN 102748335 A CN102748335 A CN 102748335A
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CN
China
Prior art keywords
control valve
valve
communicated
solenoid directional
oil
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Granted
Application number
CN201210225278XA
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Chinese (zh)
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CN102748335B (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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Filing date
Publication date
Application filed by Sany Heavy Equipment Co Ltd filed Critical Sany Heavy Equipment Co Ltd
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
Application granted granted Critical
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 invention relates to the technical field of engineering machinery, and discloses a hydraulic system and a heading machine. The hydraulic system comprises a proportional reversing valve group for controlling a first movement mechanism with the requirement of speed regulation to work; and a switch reversing valve group for controlling a second movement mechanism without the requirement of speed regulation to work. The movement mechanisms are divided into two types: one type is the first movement mechanism with the requirement of working speed regulation, and the other type is the second movement mechanism without the requirement of working speed regulation, wherein the first movement mechanism is controlled through the proportional reversing valve group, and can be adjusted according to needs; and the second movement mechanism is controlled through the switch reversing valve group so as to realize stability in working. The hydraulic system can effectively solve the problems that the existing hydraulic system has low efficiency, complex return circuit, and high component cost.

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 of control executing mechanism movement velocity and moving direction usually, but some does not need the actuator of speed governing to use identical control oil channel too, causes unnecessary waste; For example; The hydraulic control device that development machine adopts is to be load sensing multi-way valve mostly, is used for the moving direction and the speed of control executing mechanism, and its control mode is manually control or hydraulic pilot control.Load sensing multi-way valve adopts the split blade type structure, and each multi-way valve provides one road hydraulic oil.The flow of hydraulic oil is by the opening area of main valve plug and the main valve plug pressure reduction decision that is determined by pressure compensator.
Adopt the HYDRAULIC CONTROL SYSTEM of split blade type load sensing multi-way valve to shovel the mechanism that leaf fat cylinder, back support cylinder etc. do not need speed governing, cause shortcomings such as hydraulic system efficient is low, the loop is complicated, element cost height.
Therefore, how improving to existing hydraulic system, so that solve the existing problem that hydraulic system reinstate rate is low, the loop is complicated, the element cost is high, is the technical barrier that those skilled in the art need 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 existing problem that hydraulic system reinstate rate is low, the loop is complicated, the element cost is high.
On the one hand, the invention provides a kind of hydraulic system, comprising:
Be used to control the proportional reversing valve group of the first actuating mechanism work that needs speed governing;
Be used to control the switch selector valve group of the second actuating mechanism work that does not need speed governing.
Further, said proportional reversing valve group comprises: the first oil-feed oil circuit;
The first pilot pressure oil circuit;
First oil return circuit;
The first load feedback oil circuit;
The first draining oil circuit;
First working oil path; And,
The throttle grverning assembly that is communicated with the said first oil-feed oil circuit, the said first pilot pressure oil circuit and the said first draining oil circuit; The throttle grverning assembly carries out throttle grverning control through the first pilot pressure oil circuit to the first oil-feed oil circuit;
The first switching-over assembly that is communicated with said first oil return circuit, the said first draining oil circuit, said first working oil path and said throttle grverning assembly; The first switching-over assembly is through adjustings that commutate of the oil circuit to throttle grverning assembly output, with the control of realization to first working oil path.
Further, said throttle grverning assembly comprises:
Pressure compensator, said pressure compensator comprise filler opening, oil outlet, the first compensation oil circuit and and the second compensation oil circuit, the filler opening of said pressure compensator is communicated with the said first oil-feed oil circuit;
The hydraulic control proportional flow control valve, said hydraulic control proportional flow control valve comprises filler opening, oil outlet, control port and drain tap, the first compensation oil circuit of said pressure compensator and the second compensation oil circuit are communicated with filler opening and oil outlet at said hydraulic control proportional flow control valve respectively; The filler opening of said hydraulic control proportional flow control valve is communicated with said pressure compensator oil outlet; The drain tap of said hydraulic control proportional flow control valve is communicated with the said first draining oil circuit; Be used to regulate the solenoid-operated proportional reduction valve of said hydraulic control proportional flow control valve flow; Said solenoid-operated proportional reduction valve comprises filler opening, oil outlet and Electromagnetic Control end; The filler opening of said solenoid-operated proportional reduction valve is communicated with the said first pilot pressure oil circuit; The oil outlet of said solenoid-operated proportional reduction valve is communicated with the control port of said hydraulic control proportional flow control valve, the Electromagnetic Control end external controller of said solenoid-operated proportional reduction valve.
Further, the said first switching-over assembly comprises:
The first hydraulic pressure reversing unit that is communicated with said hydraulic control proportional flow control valve oil outlet;
First solenoid directional control valve that is communicated with the said first hydraulic pressure reversing unit.
Further, the said first hydraulic pressure reversing unit comprises:
First logical valve, its first hydraulic fluid port is communicated with said hydraulic control proportional flow control valve oil outlet, and second hydraulic fluid port of said first logical valve is communicated with second hydraulic fluid port of said first working oil path;
Second logical valve, its first hydraulic fluid port is communicated with said hydraulic control proportional flow control valve oil outlet, and second hydraulic fluid port of said second logical valve is communicated with first hydraulic fluid port of said first working oil path;
The 3rd logical valve, its first hydraulic fluid port is communicated with said first oil return circuit, and second hydraulic fluid port of said the 3rd logical valve is communicated with second hydraulic fluid port of said first working oil path;
The 4th logical valve, its first hydraulic fluid port is communicated with said first oil return circuit, and second hydraulic fluid port of said the 4th logical valve is communicated with first hydraulic fluid port of said first working oil path; Wherein
Said first solenoid directional control valve comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said first solenoid directional control valve is communicated with said hydraulic control proportional flow control valve oil outlet, and the drain tap of said first solenoid directional control valve is communicated with the said first draining oil circuit; First oil outlet of said first solenoid directional control valve is communicated with the control port of the control port of said first logical valve and said the 4th logical valve; Second oil outlet of said first solenoid directional control valve is communicated with the control port of the control port of said second logical valve and said the 3rd logical valve; Said first solenoid directional control valve comprises three kinds of working staties:
Under first kind of working state, the drain tap of said first solenoid directional control valve is communicated with the control port of the control port of the control port of said first logical valve, said second logical valve, said the 3rd logical valve and the control port of said the 4th logical valve respectively through first oil outlet and second oil outlet of said first solenoid directional control valve;
Under second kind of working state, the filler opening of said first solenoid directional control valve is communicated with the control port of said first logical valve and the control port of said the 4th logical valve through first oil outlet of said first solenoid directional control valve; The drain tap of said first solenoid directional control valve is communicated with the control port of said second logical valve and the control port of said the 3rd logical valve through second oil outlet of said first solenoid directional control valve;
Under the third working state, the filler opening of said first solenoid directional control valve is communicated with the control port of said second logical valve and the control port of said the 3rd logical valve through second oil outlet of said first solenoid directional control valve; The drain tap of said first solenoid directional control valve is communicated with the control port of said first logical valve and the control port of said the 4th logical valve through first oil outlet of said first solenoid directional control valve.
Further, the said first hydraulic pressure reversing unit comprises:
First hydraulicdirectional control valve comprises filler opening, return opening, first control port, second control port, first oil outlet and second oil outlet; The filler opening of said first hydraulicdirectional control valve is communicated with said hydraulic control proportional flow control valve oil outlet; The return opening of said first hydraulicdirectional control valve is communicated with said first oil return circuit; First oil outlet of said first hydraulicdirectional control valve and second oil outlet are communicated with first hydraulic fluid port and second hydraulic fluid port of said first working oil path respectively; Said first hydraulicdirectional control valve comprises three working staties:
Under first working state, first oil outlet of said first hydraulicdirectional control valve and second oil outlet are communicated with the return opening of said first hydraulicdirectional control valve;
Under second working state, first oil outlet of said first hydraulicdirectional control valve is communicated with the filler opening of said first hydraulicdirectional control valve, and second oil outlet of said first hydraulicdirectional control valve is communicated with the return opening of said first hydraulicdirectional control valve;
Under the 3rd working state, first oil outlet of said first hydraulicdirectional control valve is communicated with the return opening of said first hydraulicdirectional control valve, and second oil outlet of said first hydraulicdirectional control valve is communicated with the filler opening of said first hydraulicdirectional control valve;
Said first solenoid directional control valve comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said first solenoid directional control valve is communicated with the said first pilot pressure oil circuit or is communicated with said hydraulic control proportional flow control valve oil outlet, and the drain tap of said first solenoid directional control valve is communicated with the said first draining oil circuit; First oil outlet of said first solenoid directional control valve and second oil outlet are communicated with first control port and second control port of said first hydraulicdirectional control valve respectively; Said first solenoid directional control valve comprises three kinds of working staties of said first hydraulicdirectional control valve execution of control different operating state:
Under first kind of working state, the drain tap of said first solenoid directional control valve is communicated with first control port and second control port of said first hydraulicdirectional control valve respectively through first oil outlet and second oil outlet of said first solenoid directional control valve;
Under second kind of working state, the filler opening of said first solenoid directional control valve is communicated with second control port of said first hydraulicdirectional control valve through first oil outlet of said first solenoid directional control valve; The drain tap of said first solenoid directional control valve is communicated with first control port of said first hydraulicdirectional control valve through second oil outlet of said first solenoid directional control valve;
Under the third working state, the filler opening of said first solenoid directional control valve is communicated with first control port of said first hydraulicdirectional control valve through second oil outlet of said first solenoid directional control valve; The drain tap of said first solenoid directional control valve is communicated with second control port of said first hydraulicdirectional control valve through first oil outlet of said first solenoid directional control valve.
Further, said first solenoid directional control valve is a three position four-way electromagnetic valve; And/or
Said first hydraulicdirectional control valve is the 3-position 4-way hydraulic operated valve; And/or
The said first load feedback oil circuit is provided with first one-way valve, and the filler opening of said first one-way valve is communicated with the oil outlet of said hydraulic control proportional flow control valve.
Further, said switch selector valve group comprises:
The second oil-feed oil circuit;
Second oil return circuit;
The second load feedback oil circuit;
The second draining oil circuit;
Second working oil path; And
With the series flow control valve that the said second oil-feed oil circuit is communicated with, said series flow control valve is used to regulate the second oil-feed oil circuit flow, makes the second actuating mechanism operating rate stable;
The second switching-over assembly that is communicated with the said second oil-feed oil circuit, said second oil return circuit, the said second load feedback oil circuit, the said second draining oil circuit and said second working oil path; The second switching-over assembly is through adjustings that commutate of the oil circuit to series flow control valve output, with the control of realization to second working oil path.
Further, the said second load feedback oil circuit comprises the first reverse feedback oil pipe and the second reverse feedback oil pipe;
The first feedback oil pipe of the said second load feedback oil circuit is provided with second one-way valve, and the filler opening of said second one-way valve is communicated with first hydraulic fluid port of said second working oil path;
The second feedback oil pipe of the said second load feedback oil circuit is provided with the 3rd one-way valve, and the filler opening of said the 3rd one-way valve is communicated with second hydraulic fluid port of said second working oil path.
Further, the said second switching-over assembly comprises:
The second hydraulic pressure reversing unit that is communicated with said series flow control valve;
The solenoid directional control valve group that is communicated with the said second hydraulic pressure reversing unit.
Further, said solenoid directional control valve group comprises second solenoid directional control valve and the 3rd solenoid directional control valve;
The said second hydraulic pressure reversing unit comprises:
The 5th logical valve, its first hydraulic fluid port is communicated with said series flow control valve oil outlet; Second hydraulic fluid port of said the 5th logical valve is communicated with second hydraulic fluid port of described second working oil path;
The 6th logical valve, its first hydraulic fluid port is communicated with said series flow control valve oil outlet; Second hydraulic fluid port of said the 6th logical valve is communicated with first hydraulic fluid port of described second working oil path;
The 7th logical valve, its first hydraulic fluid port is communicated with said second oil return circuit; Second hydraulic fluid port of said the 7th logical valve is communicated with second hydraulic fluid port of described second working oil path;
The 8th logical valve, its first hydraulic fluid port is communicated with said second oil return circuit; Second hydraulic fluid port of said the 8th logical valve is communicated with first hydraulic fluid port of described second working oil path; Wherein
Said second solenoid directional control valve comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said second solenoid directional control valve is communicated with the said second oil-feed oil circuit; The drain tap of said second solenoid directional control valve is communicated with the said second draining oil circuit, and first oil outlet of said second solenoid directional control valve is communicated with the control port of said the 5th logical valve; Second oil outlet of said second solenoid directional control valve is communicated with the control port of said the 7th logical valve; Said second solenoid directional control valve comprises two kinds of working staties:
Under first kind of working state, the filler opening of said second solenoid directional control valve is communicated with the control port of said the 5th logical valve through first oil outlet of said second solenoid directional control valve; The drain tap of said second solenoid directional control valve is communicated with the control port of said the 7th logical valve through second oil outlet of said second solenoid directional control valve;
Under second kind of working state, the filler opening of said second solenoid directional control valve is communicated with the control port of said the 7th logical valve through second oil outlet of said second solenoid directional control valve; The drain tap of said second solenoid directional control valve is communicated with the control port of said the 5th logical valve through first oil outlet of said second solenoid directional control valve;
Said the 3rd solenoid directional control valve comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said the 3rd solenoid directional control valve is communicated with the said second oil-feed oil circuit, and the drain tap of said the 3rd solenoid directional control valve is communicated with the said second draining oil circuit; First oil outlet of said the 3rd solenoid directional control valve is communicated with the control port of said the 6th logical valve; Second oil outlet of said the 3rd solenoid directional control valve is communicated with the control port of said the 8th logical valve; Said the 3rd solenoid directional control valve comprises said the 3rd solenoid directional control valve first working state and second working state with said second solenoid directional control valve, first working state and the second working state collaborative work, wherein,
Said the 3rd solenoid directional control valve first working state comprises that the filler opening of said the 3rd solenoid directional control valve is communicated with the control port of said the 6th logical valve through first oil outlet of said the 3rd solenoid directional control valve; The drain tap of said the 3rd solenoid directional control valve is communicated with the control port of said the 8th logical valve through second oil outlet of said the 3rd solenoid directional control valve;
Said the 3rd solenoid directional control valve second working state comprises that the filler opening of said the 3rd solenoid directional control valve is communicated with the control port of said the 8th logical valve through second oil outlet of said the 3rd solenoid directional control valve; The drain tap of said the 3rd solenoid directional control valve is communicated with the control port of said the 6th logical valve through first oil outlet of said the 3rd solenoid directional control valve.
Further, said second solenoid directional control valve is a two-position four-way solenoid valve, and/or
Said the 3rd solenoid directional control valve is a two-position four-way solenoid valve.
Further, said switch selector valve group also comprises the second pilot pressure oil circuit;
Said solenoid directional control valve group comprises the 4th solenoid directional control valve;
The said second hydraulic pressure reversing unit comprises:
Second hydraulicdirectional control valve comprises filler opening, return opening, first control port, second control port, first oil outlet and second oil outlet; The filler opening of said second hydraulicdirectional control valve is communicated with said series flow control valve oil outlet; The return opening of said second hydraulicdirectional control valve is communicated with said second oil return circuit; First oil outlet of said second hydraulicdirectional control valve and second oil outlet are communicated with first hydraulic fluid port and second hydraulic fluid port of said second working oil path respectively; Said second hydraulicdirectional control valve comprises three working staties:
Under first working state, first oil outlet of said second hydraulicdirectional control valve and second oil outlet are communicated with the return opening of said second hydraulicdirectional control valve;
Under second working state, first oil outlet of said second hydraulicdirectional control valve is communicated with the filler opening of said second hydraulicdirectional control valve, and second oil outlet of said second hydraulicdirectional control valve is communicated with the return opening of said second hydraulicdirectional control valve;
Under the 3rd working state, first oil outlet of said second hydraulicdirectional control valve is communicated with the return opening of said second hydraulicdirectional control valve, and second oil outlet of said second hydraulicdirectional control valve is communicated with the filler opening of said second hydraulicdirectional control valve;
Said the 4th solenoid directional control valve comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said the 4th solenoid directional control valve is communicated with the said second pilot pressure oil circuit or is communicated with said series flow control valve oil outlet, and the drain tap of said the 4th solenoid directional control valve is communicated with the said second draining oil circuit; First oil outlet of said the 4th solenoid directional control valve and second oil outlet are communicated with first control port and second control port of said second hydraulicdirectional control valve respectively; Said the 4th solenoid directional control valve comprises three kinds of working staties of said second hydraulicdirectional control valve execution of control different operating state:
Under first kind of working state, the drain tap of said the 4th solenoid directional control valve is communicated with first control port and second control port of said second hydraulicdirectional control valve respectively through first oil outlet and second oil outlet of said the 4th solenoid directional control valve;
Under second kind of working state, the filler opening of said the 4th solenoid directional control valve is communicated with second control port of said second hydraulicdirectional control valve through first oil outlet of said the 4th solenoid directional control valve; The drain tap of said the 4th solenoid directional control valve is communicated with first control port of said second hydraulicdirectional control valve through second oil outlet of said the 4th solenoid directional control valve;
Under the third working state, the filler opening of said the 4th solenoid directional control valve is communicated with first control port of said second hydraulicdirectional control valve through second oil outlet of said the 4th solenoid directional control valve; The drain tap of said the 4th solenoid directional control valve is communicated with second control port of said second hydraulicdirectional control valve through first oil outlet of said the 4th solenoid directional control valve.
Further, said the 4th solenoid directional control valve is a three position four-way electromagnetic valve; And/or
Said second hydraulicdirectional control valve is the 3-position 4-way hydraulic operated valve.
According to a further aspect in the invention, the present invention also provides a kind of development machine, and said development machine is provided with above-mentioned each described hydraulic system.
Further, said first actuating mechanism comprises: cutterhead up-down, angling cylinder, running motor; Said second actuating mechanism comprises: shovel plate and back support frame.
The invention provides a kind of hydraulic system, comprising: the proportional reversing valve group that is used to control the first actuating mechanism work that needs speed governing; Be used to control the switch selector valve group of the second actuating mechanism work that does not need speed governing.Actuating mechanism is divided into two types; One type is first actuating mechanism that needs to regulate operating rate, and the control of the first actuating mechanism passing ratio selector valve group can be regulated first actuating mechanism as required; Another kind of is second actuating mechanism that need not regulate operating rate; Second actuating mechanism realizes the second actuating mechanism smooth working through the control of switch selector valve group, and the present invention can effectively solve the existing problem that hydraulic system reinstate rate is low, the loop is complicated, the element cost is high.
Description of drawings
Fig. 1 is the hydraulic principle schematic representation of proportional reversing valve prescription case one in the embodiment of the invention;
Fig. 2 is the hydraulic principle schematic representation of proportional reversing valve prescription case two in the embodiment of the invention;
Fig. 3 is the hydraulic principle schematic representation of switch selector valve prescription case one in the embodiment of the invention;
Fig. 4 is the hydraulic principle schematic representation of switch selector valve prescription case two in the embodiment of the invention.
Description of reference numerals: 1, first one-way valve; 11, second one-way valve; 12, the 3rd one-way valve; 21, first logical valve; 22, 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, first solenoid directional control valve; 61, the 4th solenoid directional control valve; 7, second solenoid directional control valve; 71, the 3rd solenoid directional control valve; 8, series flow control valve; 9, first hydraulicdirectional control valve; 91, second hydraulicdirectional control valve.
Embodiment
In order to make those skilled in the art understand technological scheme of the present invention better, the present invention is done further detailed description below in conjunction with accompanying drawing and specific embodiment.Should be pointed out that description and the description order to concrete structure only is the explanation to specific embodiment in this part, should not be regarded as that protection scope of the present invention is had any restriction.
Because the present invention is combined by proportional reversing valve group and switch selector valve group, and each two kinds of scheme of proportional reversing valve group that the embodiment of the invention provides and switch selector valve group; So can be combined into four kinds of embodiments of the invention, each scheme that is primarily aimed at proportional reversing valve group and switch selector valve group below describes.
The present invention provides a kind of hydraulic system, comprising: the proportional reversing valve group that is used to control the first actuating mechanism work that needs speed governing; Be used to control the switch selector valve group of the second actuating mechanism work that does not need speed governing.Actuating mechanism is divided into two types, and one type is first actuating mechanism that needs to regulate operating rate, and the first actuating mechanism passing ratio selector valve group is controlled, and can regulate the operating rate of first actuating mechanism through the throttle grverning element of regulating the proportional reversing valve group.Another kind of is second actuating mechanism that need not regulate operating rate, and second actuating mechanism can realize steadily moving according to predetermined speed through the control of switch selector valve group basically, and its element cost that needs is low, long service life; Whole actuating mechanism is control separately, makes that hydraulic system efficient is high, the loop is simple, and the element cost is low.Can make up according to existing proportional reversing valve integral switch selector valve group, and first actuating mechanism and second actuating mechanism are separately carried out hydraulic control,
Wherein, As shown in Figure 1, among the figure principle schematic of proportional reversing valve prescription case one, the proportional reversing valve group of two parallel connections shown in the figure; Solid line is a transmission hydraulic oil circuit; Dotted line is control hydraulic oil circuit, and wherein each proportional reversing valve group comprises: the first oil-feed oil circuit, and the first oil-feed oil circuit is communicated with oil inlet P; The first pilot pressure oil circuit, the first pilot pressure oil circuit is communicated with pilot pressure hydraulic fluid port P1; First oil return circuit, first oil return circuit is communicated with oil return inlet T; The first load feedback oil circuit, the first feedback oil circuit is communicated with feedback hydraulic fluid port Ls; The first draining oil circuit, the first draining hydraulic fluid port is communicated with draining hydraulic fluid port T1; First working oil path, first working oil path is communicated with actuator port A1 and B1; And the throttle grverning assembly that is communicated with the first oil-feed oil circuit, the first pilot pressure oil circuit and the first draining oil circuit; The throttle grverning assembly carries out throttle grverning control through the first pilot pressure oil circuit to the first oil-feed oil circuit; With first oil return circuit, state the first switching-over assembly that the first draining oil circuit, first working oil path and throttle grverning assembly be communicated with.The first switching-over assembly is through adjustings that commutate of the oil circuit to throttle grverning assembly output, with the control of realization to first working oil path.
Wherein the throttle grverning assembly can be related domain speed governing element commonly used, and the first switching-over assembly can be related domain commutation element commonly used; Wherein, In the oil return of hydraulic system, contain more impurity, the throttle grverning assembly is set in oil return circuit, occur faults such as spool clamping stagnation easily; The contamination resistance of system is poor; Oil-feed place of hydraulic system of the present invention is provided with the throttle grverning group, at fuel-displaced place the throttle grverning assembly is not set, has improved the hydraulic system contamination resistance.The speed governing element of hydraulic system separates with commutation element, has improved the stability of system.
As shown in Figure 1, the 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, the first compensation oil circuit and and the second compensation oil circuit, the filler opening of pressure compensator is communicated with the said first oil-feed oil circuit.
Hydraulic control proportional flow control valve 5 comprises filler opening, oil outlet, control port and drain tap, and the first compensation oil circuit of said pressure compensator 4 and the second compensation oil circuit are communicated with filler opening and oil outlet at said hydraulic control proportional flow control valve 5 respectively; The filler opening of said hydraulic control proportional flow control valve 5 is communicated with said pressure compensator oil outlet; The drain tap of said hydraulic control proportional flow control valve 5 is communicated with the said first draining oil circuit;
Solenoid-operated proportional reduction valve 3 is used to regulate hydraulic control proportional flow control valve 5 flows; 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; The solenoid-operated proportional reduction valve can accurately be regulated the flow of hydraulic control proportional flow control valve.
In addition, the first switching-over assembly comprises: the first hydraulic pressure reversing unit that is communicated with said hydraulic control proportional flow control valve 5; First solenoid directional control valve 6 that is communicated with the said first hydraulic pressure reversing unit.
As shown in Figure 1, the first hydraulic pressure reversing unit comprises: first logical valve 21, and its first hydraulic fluid port is communicated with said hydraulic control proportional flow control valve 5 oil outlets, and second hydraulic fluid port of first logical valve 21 is communicated with second hydraulic fluid port of said first working oil path; Second logical valve 22, its first hydraulic fluid port is communicated with said hydraulic control proportional flow control valve 5 oil outlets, and second hydraulic fluid port of said second logical valve 22 is communicated with first hydraulic fluid port of said first working oil path; The 3rd logical valve 23, its first hydraulic fluid port is communicated with said first oil return circuit, and second hydraulic fluid port of said the 3rd logical valve 23 is communicated with second hydraulic fluid port of said first working oil path; The 4th logical valve 24, its first hydraulic fluid port is communicated with said first oil return circuit, and second hydraulic fluid port of said the 4th logical valve 24 is communicated with first hydraulic fluid port of said first working oil path;
Wherein, first solenoid directional control valve 6 comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of first solenoid directional control valve 6 is communicated with hydraulic control proportional flow control valve 5 oil outlets, and the drain tap of first solenoid directional control valve 6 is communicated with the first draining oil circuit; First oil outlet of said first solenoid directional control valve 6 is communicated with the control port of the control port of said first logical valve 21 and said the 4th logical valve 24; Second oil outlet of said first solenoid directional control valve 6 is communicated with the control port of the control port of said second logical valve 22 and said the 3rd logical valve 23; First solenoid directional control valve 6 comprises three kinds of working staties:
Under first kind of working state, the drain tap of first solenoid directional control valve 6 is communicated with the control port of first logical valve 21, the control port of second logical valve 22, the control port of the 3rd logical valve 23 and the control port of the 4th logical valve 24 respectively through first oil outlet and second oil outlet of said first solenoid directional control valve 6.
Under second kind of working state, the filler opening of first solenoid directional control valve 6 is communicated with the control port of first logical valve 21 and the control port of the 4th logical valve 24 through first oil outlet of first solenoid directional control valve 6; The drain tap of first solenoid directional control valve 6 is communicated with the control port of second logical valve 22 and the control port of the 3rd logical valve 23 through second oil outlet of first solenoid directional control valve 6.
Under the third working state, the filler opening of first solenoid directional control valve 6 is communicated with the control port of second logical valve 22 and the control port of the 3rd logical valve 23 through second oil outlet of first solenoid directional control valve 6; The drain tap of first solenoid directional control valve 6 is communicated with the control port of first logical valve 21 and the control port of the 4th logical valve 24 through first oil outlet of first solenoid directional control valve 6.
First solenoid directional control valve 6 is a three position four-way electromagnetic valve among Fig. 1; First solenoid directional control valve 6 is first working state when being in meta, and A1, B1 oil hydraulic circuit are closed; First solenoid directional control valve 6 is second working state when being in position, a left side, and the A1 mouth is the filler opening of actuator, and the B1 mouth is the return opening of actuator; First solenoid directional control valve 6 is the 3rd working state when being in right, and the B1 mouth is the filler opening of actuator, and the A1 mouth is the return opening of actuator.
In addition, be the principle schematic of proportional reversing valve prescription case two like Fig. 2, the throttle grverning modular construction is identical with the structure of scheme one among the figure, and the first switching-over assembly comprises: the first hydraulic pressure reversing unit that is communicated with said hydraulic control proportional flow control valve 5; First solenoid directional control valve 6 that is communicated with said hydraulic pressure reversing unit.
The first hydraulic pressure reversing unit comprises: first hydraulicdirectional control valve 9, and it comprises filler opening, return opening, first control port, second control port, first oil outlet and second oil outlet; The filler opening of first hydraulicdirectional control valve 9 is communicated with hydraulic control proportional flow control valve 5 oil outlets; The return opening of first hydraulicdirectional control valve 9 is communicated with first oil return circuit; First oil outlet of said first hydraulicdirectional control valve 9 and second oil outlet are communicated with first hydraulic fluid port and second hydraulic fluid port of said first working oil path respectively; First hydraulicdirectional control valve 9 comprises three working staties:
Under first working state, first oil outlet of first hydraulicdirectional control valve 9 and second oil outlet are communicated with the return opening of said first hydraulicdirectional control valve 9.
Under second working state, under the 3rd working state, first oil outlet of first hydraulicdirectional control valve 9 is communicated with the filler opening of first hydraulicdirectional control valve 9, and second oil outlet of first hydraulicdirectional control valve 9 is communicated with the return opening of first hydraulicdirectional control valve 9.
Under the 3rd working state, first oil outlet of first hydraulicdirectional control valve 9 is communicated with the return opening of first hydraulicdirectional control valve 9, and second oil outlet of first hydraulicdirectional control valve 9 is communicated with the filler opening of first hydraulicdirectional control valve 9.
First solenoid directional control valve 6 comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of first solenoid directional control valve 6 is communicated with the said first pilot pressure oil circuit, and the drain tap of first solenoid directional control valve 6 is communicated with the said first draining oil circuit; First oil outlet of said first solenoid directional control valve 6 and second oil outlet are communicated with first control port and second control port of said first hydraulicdirectional control valve 9 respectively; First solenoid directional control valve 6 comprises three kinds of working staties of said first hydraulicdirectional control valve of control 9 execution different operating states:
Under first kind of working state, the drain tap of said first solenoid directional control valve 6 is communicated with first control port and second control port of said first hydraulicdirectional control valve 9 respectively through first oil outlet and second oil outlet of said first solenoid directional control valve 6.
Under second kind of working state, the filler opening of first solenoid directional control valve 6 is communicated with second control port of first hydraulicdirectional control valve 9 through first oil outlet of first solenoid directional control valve 6; The drain tap of first solenoid directional control valve 6 is communicated with first control port of first hydraulicdirectional control valve 9 through second oil outlet of first solenoid directional control valve 6.
Under the third working state, the filler opening of said first solenoid directional control valve 6 is communicated with first control port of said first hydraulicdirectional control valve 9 through second oil outlet of said first solenoid directional control valve 6; The drain tap of first solenoid directional control valve 6 is communicated with second control port of said first hydraulicdirectional control valve 9 through first oil outlet of said first solenoid directional control valve 6.
First solenoid directional control valve 6 is controlled first hydraulicdirectional control valve, 9 entering different operating states through first control port and second control port of controlling first hydraulicdirectional control valve 9, and as shown in Figure 2, first solenoid directional control valve 6 is a three position four-way electromagnetic valve; First hydraulicdirectional control valve 9 is the 3-position 4-way hydraulic operated valve; Under 6 first kinds of working state situation of first solenoid directional control valve (being in meta), first hydraulicdirectional control valve 9 gets into first working state (being in meta), and A1, B1 oil hydraulic circuit are closed; Under 6 second kinds of working state situation of first solenoid directional control valve (being in upper), first hydraulicdirectional control valve 9 gets into second working state (being in right position), and the A1 mouth is the filler opening of actuator, and the B1 mouth is the return opening of actuator; Under 6 first kinds of working state situation of first solenoid directional control valve (being in the next), first hydraulicdirectional control valve 9 gets into the 3rd working state (being in position, a left side), and the B1 mouth is the filler opening of actuator, and the A1 mouth is the return opening of actuator.
Wherein, the filler opening of first solenoid directional control valve 6 can also be communicated with the first oil-feed oil circuit and replace being communicated with the first pilot pressure oil circuit, to realize the control to first hydraulicdirectional control valve 9.Because first solenoid directional control valve 6 is controlled first hydraulicdirectional control valve 9 through external oil circuit in the scheme two, the oil pressure that needs is little, also can be communicated with the first pilot pressure oil circuit so the filler opening of first solenoid directional control valve 6 can be communicated with the first oil-feed oil circuit.
As shown in Figure 3, Fig. 3 is the structural principle schematic representation of switch selector valve prescription case one, comprises two switch selector valve groups among the figure, and wherein, a switch selector valve group comprises: the second oil-feed oil circuit, the second oil-feed oil circuit are communicated with oil-feed hydraulic fluid port P; Second oil return circuit, second oil return circuit is communicated with oil return inlet T; The second load feedback oil circuit, the second load feedback oil circuit are communicated with feedback hydraulic fluid port Ls; The second draining oil circuit, the second draining oil circuit is communicated with drain tap T1; Second working oil path, second working oil path is communicated with actuator port A3 and B3, and the series flow control valve 8 that is communicated with the second oil-feed oil circuit, and said series flow control valve 8 is used to regulate the second oil-feed oil circuit flow, makes the second actuating mechanism operating rate stable; The second switching-over assembly that is communicated with the second oil-feed oil circuit, second oil return circuit, the second load feedback oil circuit, the second draining oil circuit and second working oil path; The second switching-over assembly is through adjustings that commutate of the oil circuit to series flow control valve 8 output, with the control of realization to second working oil path.
Wherein, as shown in Figure 3, the second load feedback oil circuit comprises the first reverse feedback oil pipe and the second reverse feedback oil pipe; The filler opening that the first feedback oil pipe of the second load feedback oil circuit is provided with second one-way valve, 11, the second one-way valves 11 is communicated with first hydraulic fluid port of second working oil path; The filler opening that the second feedback oil pipe of the second load feedback oil circuit is provided with the 3rd one-way valve 12, the three one-way valves 12 is communicated with second oil circuit of said second working oil path.Through feedback oil circuit feedback pressure signal.
Wherein, as shown in Figure 3, the second switching-over assembly comprises: the second hydraulic pressure reversing unit that is communicated with said series flow control valve 8; The solenoid directional control valve group that is communicated with the said second hydraulic pressure reversing unit.
The solenoid directional control valve group comprises second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71; The second hydraulic pressure reversing unit comprises: the 5th logical valve 25, and its first hydraulic fluid port is communicated with said series flow control valve 8 oil outlets; Second hydraulic fluid port of said the 5th logical valve 25 is communicated with second hydraulic fluid port of described second working oil path; The 6th logical valve 26, its first hydraulic fluid port is communicated with said series flow control valve 8 oil outlets; Second hydraulic fluid port of said the 6th logical valve 26 is communicated with first hydraulic fluid port of described second working oil path; The 7th logical valve 27, its first hydraulic fluid port is communicated with said second oil return circuit; Second hydraulic fluid port of said the 7th logical valve 27 is communicated with second hydraulic fluid port of described second working oil path; The 8th logical valve 28, its first hydraulic fluid port is communicated with said second oil return circuit; Second hydraulic fluid port of said the 8th logical valve 28 is communicated with first hydraulic fluid port of described second working oil path.Wherein:
Second solenoid directional control valve 7 comprises filler opening, drain tap, first oil outlet and second oil outlet, and the filler opening of second solenoid directional control valve 7 is communicated with the said second oil-feed oil circuit, and the drain tap of said second solenoid directional control valve 7 is communicated with the said second draining oil circuit; First oil outlet of said second solenoid directional control valve 7 is communicated with the control port of said the 5th logical valve 25; Second oil outlet of said second solenoid directional control valve 7 is communicated with the control port of said the 7th logical valve 27; Said second solenoid directional control valve 7 comprises two kinds of working staties:
Under first kind of working state, the filler opening of second solenoid directional control valve 7 is communicated with the control port of the 5th logical valve 25 through first oil outlet of second solenoid directional control valve 7; The drain tap of second solenoid directional control valve 7 is communicated with the control port of the 7th logical valve 27 through second oil outlet of second solenoid directional control valve 7.
Under second kind of working state, the filler opening of second solenoid directional control valve 7 is communicated with the control port of the 7th logical valve 27 through second oil outlet of second solenoid directional control valve 7; The drain tap of second solenoid directional control valve 7 is communicated with the control port of the 5th logical valve 25 through first oil outlet of second solenoid directional control valve 7.
The 3rd solenoid directional control valve 71 comprises filler opening, drain tap, first oil outlet and second oil outlet, and the filler opening of the 3rd solenoid directional control valve 71 is communicated with the second oil-feed oil circuit, and the drain tap of the 3rd solenoid directional control valve 71 is communicated with the second draining oil circuit; First oil outlet of said the 3rd solenoid directional control valve 71 is communicated with the control port of said the 6th logical valve 26; Second oil outlet of said the 3rd solenoid directional control valve 71 is communicated with the control port of said the 8th logical valve 28; The 3rd solenoid directional control valve 71 comprises the 3rd solenoid directional control valve 71 first working staties and second working state with second solenoid directional control valve, 7 first working staties and the second working state collaborative work, wherein,
The 3rd solenoid directional control valve 71 first working staties comprise that the filler opening of the 3rd solenoid directional control valve 71 is communicated with the control port of the 6th logical valve 26 through 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 said the 8th logical valve 28 through second oil outlet of said the 3rd solenoid directional control valve 71.
The 3rd solenoid directional control valve 71 second working staties comprise that the filler opening of the 3rd solenoid directional control valve 71 is communicated with the control port of the 8th logical valve 28 through 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 said the 6th logical valve 26 through first oil outlet of the 3rd solenoid directional control valve 71.
As shown in Figure 3, the solenoid directional control valve group comprises second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71; Second solenoid directional control valve 7 is a two-position four-way solenoid valve, and the 3rd solenoid directional control valve 71 also is a two-position four-way solenoid valve; Collaborative work through second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71 different operating states; Make the solenoid directional control valve group keep three kinds of different working states; Wherein, First working state of solenoid directional control valve group does, the collaborative work of first working state of first working state of second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71, and this moment, A3, B3 oil hydraulic circuit were closed; Second working state of solenoid directional control valve group does, the collaborative work of first working state of second working state of second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71, and B3 this moment mouthful is the filler opening of actuator, the A3 mouth is the return opening of actuator; The 3rd working state of solenoid directional control valve group does, the collaborative work of first working state of first working state of second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71, and the A3 mouth is the filler opening of actuator, the 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 structures of switch selector valve group are constant among the figure, and the second switching-over assembly comprises: the second hydraulic pressure reversing unit that is communicated with said series flow control valve 8; The solenoid directional control valve group that is communicated with the said second hydraulic pressure reversing unit.
Wherein, switch selector valve group also comprises the second pilot pressure oil circuit; The solenoid directional control valve group comprises the 4th solenoid directional control valve 61; The second hydraulic pressure reversing unit comprises: second hydraulicdirectional control valve 91 comprises filler opening, return opening, first control port, second control port, first oil outlet and second oil outlet; The filler opening of second hydraulicdirectional control valve 91 is communicated with said series flow control valve 8 oil outlets; The return opening of second hydraulicdirectional control valve 91 is communicated with said second oil return circuit; First oil outlet of said second hydraulicdirectional control valve 91 and second oil outlet are communicated with first hydraulic fluid port and second hydraulic fluid port of said first working oil path respectively; Said second hydraulicdirectional control valve 91 comprises three working staties:
Under first working state, first oil outlet of second hydraulicdirectional control valve 91 and second oil outlet are communicated with the return opening of said second hydraulicdirectional control valve 91.
Under second working state, first oil outlet of second hydraulicdirectional control valve 91 is communicated with the filler opening of said second hydraulicdirectional control valve 91, and second oil outlet of second hydraulicdirectional control valve 91 is communicated with the return opening of said second hydraulicdirectional control valve 91.
Under the 3rd working state, first oil outlet of second hydraulicdirectional control valve 91 is communicated with the return opening of said second hydraulicdirectional control valve 91, and second oil outlet of said second hydraulicdirectional control valve 91 is communicated with the filler opening of said second hydraulicdirectional control valve 91.
The 4th solenoid directional control valve 61 comprises filler opening, drain tap, first oil outlet and 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 the said second draining oil circuit; First oil outlet of said the 4th solenoid directional control valve 61 and second oil outlet are communicated with first control port and second control port of said second hydraulicdirectional control valve 91 respectively; The 4th solenoid directional control valve 61 comprises three kinds of working staties of said second hydraulicdirectional control valve of control 91 execution different operating states:
Under first kind of working state, the drain tap of the 4th solenoid directional control valve 61 is communicated with first control port and second control port of second hydraulicdirectional control valve 91 respectively through first oil outlet and second oil outlet of the 4th solenoid directional control valve 61;
Under second kind of working state, the filler opening of the 4th solenoid directional control valve 61 is communicated with second control port of said second hydraulicdirectional control valve 91 through first oil outlet of said the 4th solenoid directional control valve 61; The drain tap of said the 4th solenoid directional control valve 61 is communicated with first control port of said second hydraulicdirectional control valve 91 through second oil outlet of said the 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 first control port of said second hydraulicdirectional control valve 91 through second oil outlet of said the 4th solenoid directional control valve 61; The drain tap of said the 4th solenoid directional control valve 61 is communicated with second control port of said second hydraulicdirectional control valve 91 through first oil outlet of said the 4th solenoid directional control valve 61.
The 4th solenoid directional control valve 61 is controlled second hydraulicdirectional control valve, 91 entering different operating states through first control port and second control port of controlling second hydraulicdirectional control valve 91, and as shown in Figure 2, the 4th solenoid directional control valve 61 is a three position four-way electromagnetic valve; Second hydraulicdirectional control valve 91 is the 3-position 4-way hydraulic operated valve; (being in meta) (orientation is as the criterion with direction shown in scheming) under 61 first kinds of working state situation of the 4th solenoid directional control valve, second hydraulicdirectional control valve 91 gets into first working staties (being in meta), and A3, B3 oil hydraulic circuit are closed; Under 61 second kinds of working state situation of the 4th solenoid directional control valve (being in upper), second hydraulicdirectional control valve 91 gets into second working state (being in right position), and the A3 mouth is the filler opening of actuator, and the B3 mouth is the return opening of actuator; Under 61 first kinds of working state situation of the 4th solenoid directional control valve (being in the next), second hydraulicdirectional control valve 91 gets into the 3rd working state (being in position, a left side), and the B3 mouth is the filler opening of actuator, and the A3 mouth is the return opening of actuator.
The 4th solenoid directional control valve 61 filler openings can also be communicated with the second oil-feed oil circuit and replace being communicated with the 4th pilot pressure oil circuit, to realize the control to second hydraulicdirectional control valve 91.Because the 4th solenoid directional control valve 61 filler openings are controlled second hydraulicdirectional control valve 91 through external oil circuit among the embodiment two, the oil pressure that needs is little, also can be communicated with the second pilot pressure oil circuit so the 4th solenoid directional control valve 61 can be communicated with the second oil-feed oil circuit.
The embodiment of the invention one does; Proportion of utilization selector valve group (scheme one) makes up with switch selector valve group (scheme one); Its concrete proportional reversing valve group (scheme one) of forming in the structure is explained with the structure of switch selector valve group (scheme one) in the above-described embodiments, repeats no more at this.
The embodiment of the invention two does; Proportion of utilization selector valve group (scheme one) makes up with switch selector valve group (scheme two); Its concrete proportional reversing valve group (scheme one) of forming in the structure is explained with the structure of switch selector valve group (scheme two) in the above-described embodiments, repeats no more at this.
The embodiment of the invention three does; Proportion of utilization selector valve group (scheme two) makes up with switch selector valve group (scheme one); Its concrete proportional reversing valve group (scheme two) of forming in the structure is explained with the structure of switch selector valve group (scheme one) in the above-described embodiments, repeats no more at this.
The embodiment of the invention four does; Proportion of utilization selector valve group (scheme two) makes up with switch selector valve group (scheme two); Its concrete proportional reversing valve group (scheme two) of forming in the structure is explained with the structure of switch selector valve group (scheme two) in the above-described embodiments, repeats no more at this.。
Its concrete principle is as follows:
The main hydraulic control of hydraulic system is partly adopted and is concentrated the valve block mode.Concentrate the oil hydraulic circuit quantity of valve piece to confirm according to the quantity of corresponding actuator.The principle of proportional reversing valve prescription case one with two oil hydraulic circuits is as shown in Figure 1; Each proportional reversing valve group comprises 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 outer oil-collecting hole 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 following:
As shown in Figure 1; Solid line is a transmission hydraulic oil circuit among the figure; Dotted line is control hydraulic oil circuit, behind the high pressure oil process filter of oil hydraulic pump output, arrives the oil inlet P of proportional reversing valve group, pressure compensator 4 filler openings in each loop of hydraulic oil flow to proportional reversing valve group; Pressure compensator 4 has been confirmed the pressure drop of hydraulic control proportional flow control valve 5 filler openings and oil outlet; Thereby make the flow of the hydraulic control proportional flow control valve 5 of flowing through only relevant with the delivery pressure of solenoid-operated proportional reduction valve 3, the delivery pressure of solenoid-operated proportional reduction valve 3 is confirmed by input current, thereby is made hydraulic system have good proportional control characteristic.
Four logical valves (first logical valve 21, second logical valve 22, the 3rd logical valve 23 and the 4th logical valve 24) and one first solenoid directional control valve 6 are formed the switch type hydraulicdirectional control valves; The hydraulic oil of hydraulic control proportional flow control valve 5 outputs is through logical valve, by the break-make of four logical valves of first solenoid directional control valve, 6 controls.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 first solenoid directional control valve 6 is in position, a left side, second logical valve 22 and 23 conductings of the 3rd logical valve, the A1 mouth is the filler opening of actuator, the B1 mouth is the return opening of actuator.When first solenoid directional control valve 6 is in right position, first logical valve 21 and 24 conductings of the 4th logical valve, the B1 mouth is the filler opening of actuator, the A1 mouth is the return opening of actuator.
First one-way valve, 1 filler opening links to each other with the oil outlet of hydraulic control proportional flow control valve 5, is used to obtain the Maximum operating pressure of different actuators oil hydraulic circuit, as the LS feedback pressure signal.
The principle of switch selector valve prescription case one with two loops is as shown in Figure 2, and each switch selector valve group comprises 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), second solenoid directional control valve 7, the 3rd solenoid directional control valve 71, series flow control valve 8.Its outer oil-collecting hole 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 following:
As shown in Figure 3; Solid line is a transmission hydraulic oil circuit among the figure; Dotted line is control hydraulic oil circuit, behind the high pressure oil process filter of oil hydraulic pump output, arrives the oil inlet P of switch selector valve group, the series flow control valve 8 of hydraulic oil flow to switch selector valve group; Each oil hydraulic circuit flow size is regulated by series flow control valve 8, thereby confirms the movement velocity of respective execution mechanisms.
The switching-over of oil hydraulic circuit is accomplished 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 (second solenoid directional control valve 7, the 3rd solenoid directional control valve 71); When two solenoid directional control valves simultaneously during no electric circuit, oil hydraulic circuit is closed.When 7 energisings of second solenoid directional control valve, the 3rd solenoid directional control valve 71 no electric circuits, the 5th logical valve 25 and 28 conductings of the 8th logical valve, the B3 mouth is the filler opening of actuator, the A3 mouth is the return opening of actuator.When 71 energisings of the 3rd solenoid directional control valve, second solenoid directional control valve, 7 no electric circuits, the 6th logical valve 26 and 27 conductings of the 7th logical valve, the A3 mouth is the filler opening of actuator, the B3 mouth is the return opening of actuator.
First one-way valve 1 links to each other with actuator port A3, the B3 of actuator respectively with second one-way valve, 11 oil-feed ports, is used to obtain the Maximum operating pressure of different actuators oil hydraulic circuit, as the LS feedback pressure signal.
As shown in Figure 2, the proportional reversing valve group replaces four logical valves with 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; Solid line is a transmission hydraulic oil circuit among the figure; Dotted line is control hydraulic oil circuit, behind the high pressure oil process filter of oil hydraulic pump output, arrives first oil inlet P of proportional reversing valve group, pressure compensator 4 filler openings in each loop of hydraulic oil flow to proportional reversing valve group; Pressure compensator 4 has been confirmed the pressure drop of hydraulic control proportional flow control valve 5 filler openings and oil outlet; Thereby make the flow of the hydraulic control proportional flow control valve 5 of flowing through only relevant with the delivery pressure of solenoid-operated proportional reduction valve 3, the delivery pressure of solenoid-operated proportional reduction valve 3 is confirmed by input current, thereby is made hydraulic system have good proportional control characteristic.
The switching-over of oil hydraulic circuit realizes through first solenoid directional control valve 6 control, first hydraulicdirectional control valve 9, and when first solenoid directional control valve 6 is in meta (orientation is as the criterion with direction shown in scheming), first hydraulicdirectional control valve 9 is in meta, and oil hydraulic circuit is closed.When first solenoid directional control valve 6 is in when upper, first hydraulicdirectional control valve 9 is in right position, and the A1 mouth is the filler opening of actuator, and the B1 mouth is the return opening of actuator.When first solenoid directional control valve 6 is in when the next, first hydraulicdirectional control valve 9 is in position, a left side, and the B1 mouth is the filler opening of actuator, and the A1 mouth is the return opening of actuator.
As shown in Figure 4, replace four logical valves with second hydraulicdirectional control valve 91 in the switch selector valve prescription case two, can realize the commutation function of oil hydraulic circuit equally.Its concrete principle is:
As shown in Figure 4; Solid line is a transmission hydraulic oil circuit among the figure; Dotted line is control hydraulic oil circuit, behind the high pressure oil process filter of oil hydraulic pump output, arrives the oil inlet P of switch selector valve group, the series flow control valve 8 of hydraulic oil flow to switch selector valve group; Each oil hydraulic circuit flow size is regulated by series flow control valve 8, thereby confirms the movement velocity of respective execution mechanisms.
The switching-over of oil hydraulic circuit realizes through second solenoid directional control valve 7 control, second hydraulicdirectional control valve 91, and when second solenoid directional control valve 7 is in meta (orientation is as the criterion with direction shown in scheming), second hydraulicdirectional control valve 91 is in meta, and oil hydraulic circuit is closed.When second solenoid directional control valve 7 is in when upper, second hydraulicdirectional control valve 91 is in right position, and the A3 mouth is the filler opening of actuator, and the B3 mouth is the return opening of actuator.When second solenoid directional control valve 7 is in when the next, second hydraulicdirectional control valve 91 is in position, a left side, and the B3 mouth is the filler opening of actuator, and the A3 mouth is the return opening of actuator.
The embodiment of the invention also provides a kind of development machine, and development machine is provided with above-mentioned hydraulic system.Because above-mentioned hydraulic system has above-mentioned technique effect, therefore, the development machine that is provided with this hydraulic system also should possess the corresponding techniques effect, and the structure of other parts is similar to the above embodiments; Its practical implementation process is similar to the above embodiments, does not give unnecessary details now.
Wherein first actuating mechanism comprises in the development machine: cutterhead up-down, angling cylinder, running motor; Second actuating mechanism comprises: shovel plate and back support frame.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (16)

1. a hydraulic system is characterized in that, comprising:
Be used to control the proportional reversing valve group of the first actuating mechanism work that needs speed governing;
Be used to control the switch selector valve group of the second actuating mechanism work that does not need speed governing.
2. according to the said hydraulic system of claim 1, it is characterized in that said proportional reversing valve group comprises:
The first oil-feed oil circuit;
The first pilot pressure oil circuit;
First oil return circuit;
The first load feedback oil circuit;
The first draining oil circuit;
First working oil path; And,
The throttle grverning assembly that is communicated with the said first oil-feed oil circuit, the said first pilot pressure oil circuit and the said first draining oil circuit; The throttle grverning assembly carries out throttle grverning control through the first pilot pressure oil circuit to the first oil-feed oil circuit;
The first switching-over assembly that is communicated with said first oil return circuit, the said first draining oil circuit, said first working oil path and said throttle grverning assembly; The first switching-over assembly is through adjustings that commutate of the oil circuit to throttle grverning assembly output, with the control of realization to first working oil path.
3. according to the said hydraulic system of claim 2, it is characterized in that said throttle grverning assembly comprises:
Pressure compensator (4), said pressure compensator (4) comprise filler opening, oil outlet, the first compensation oil circuit and and the second compensation oil circuit, the filler opening of said pressure compensator is communicated with the said first oil-feed oil circuit;
Hydraulic control proportional flow control valve (5); Said hydraulic control proportional flow control valve (5) comprises filler opening, oil outlet, control port and drain tap, and the first compensation oil circuit of said pressure compensator (4) and the second compensation oil circuit are communicated with filler opening and oil outlet at said hydraulic control proportional flow control valve (5) respectively; The filler opening of said hydraulic control proportional flow control valve (5) is communicated with said pressure compensator oil outlet; The drain tap of said hydraulic control proportional flow control valve (5) is communicated with the said first draining oil circuit;
Be used to regulate the solenoid-operated proportional reduction valve (3) of said hydraulic control proportional flow control valve (5) flow; Said solenoid-operated proportional reduction valve (3) comprises filler opening, oil outlet and Electromagnetic Control end; The filler opening of said solenoid-operated proportional reduction valve (3) is communicated with the said first pilot pressure oil circuit; The oil outlet of said solenoid-operated proportional reduction valve (3) is communicated with the control port of said hydraulic control proportional flow control valve, the Electromagnetic Control end external controller of said solenoid-operated proportional reduction valve (3).
4. according to the said hydraulic system of claim 3, it is characterized in that the said first switching-over assembly comprises:
The first hydraulic pressure reversing unit that is communicated with said hydraulic control proportional flow control valve (5) oil outlet;
First solenoid directional control valve (6) that is communicated with the said first hydraulic pressure reversing unit.
5. according to the said hydraulic system of claim 4, it is characterized in that the said first hydraulic pressure reversing unit comprises:
First logical valve (21), its first hydraulic fluid port is communicated with said hydraulic control proportional flow control valve (5) oil outlet, and second hydraulic fluid port of said first logical valve (21) is communicated with second hydraulic fluid port of said first working oil path;
Second logical valve (22), its first hydraulic fluid port is communicated with said hydraulic control proportional flow control valve (5) oil outlet, and second hydraulic fluid port of said second logical valve (22) is communicated with first hydraulic fluid port of said first working oil path;
The 3rd logical valve (23), its first hydraulic fluid port is communicated with said first oil return circuit, and second hydraulic fluid port of said the 3rd logical valve (23) is communicated with second hydraulic fluid port of said first working oil path;
The 4th logical valve (24), its first hydraulic fluid port is communicated with said first oil return circuit, and second hydraulic fluid port of said the 4th logical valve (24) is communicated with first hydraulic fluid port of said first working oil path; Wherein
Said first solenoid directional control valve (6) comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said first solenoid directional control valve (6) is communicated with said hydraulic control proportional flow control valve (5) oil outlet, and the drain tap of said first solenoid directional control valve (6) is communicated with the said first draining oil circuit; First oil outlet of said first solenoid directional control valve (6) is communicated with the control port of said first logical valve (21) and the control port of said the 4th logical valve (24); Second oil outlet of said first solenoid directional control valve (6) is communicated with the control port of said second logical valve (22) and the control port of said the 3rd logical valve (23); Said first solenoid directional control valve (6) comprises three kinds of working staties:
Under first kind of working state, the drain tap of said first solenoid directional control valve (6) is communicated with the control port of said first logical valve (21), the control port of said second logical valve (22), the control port of said the 3rd logical valve (23) and the control port of said the 4th logical valve (24) respectively through first oil outlet and second oil outlet of said first solenoid directional control valve (6);
Under second kind of working state, the filler opening of said first solenoid directional control valve (6) is communicated with the control port of said first logical valve (21) and the control port of said the 4th logical valve (24) through first oil outlet of said first solenoid directional control valve (6); The drain tap of said first solenoid directional control valve (6) is communicated with the control port of said second logical valve (22) and the control port of said the 3rd logical valve (23) through second oil outlet of said first solenoid directional control valve (6);
Under the third working state, the filler opening of said first solenoid directional control valve (6) is communicated with the control port of said second logical valve (22) and the control port of said the 3rd logical valve (23) through second oil outlet of said first solenoid directional control valve (6); The drain tap of said first solenoid directional control valve (6) is communicated with the control port of said first logical valve (21) and the control port of said the 4th logical valve (24) through first oil outlet of said first solenoid directional control valve (6).
6. according to the said hydraulic system of claim 4, it is characterized in that the said first hydraulic pressure reversing unit comprises:
First hydraulicdirectional control valve (9) comprises filler opening, return opening, first control port, second control port, first oil outlet and second oil outlet; The filler opening of said first hydraulicdirectional control valve (9) is communicated with said hydraulic control proportional flow control valve (5) oil outlet; The return opening of said first hydraulicdirectional control valve (9) is communicated with said first oil return circuit; First oil outlet of said first hydraulicdirectional control valve (9) and second oil outlet are communicated with first hydraulic fluid port and second hydraulic fluid port of said first working oil path respectively; Said first hydraulicdirectional control valve (9) comprises three working staties:
Under first working state, first oil outlet of said first hydraulicdirectional control valve (9) and second oil outlet are communicated with the return opening of said first hydraulicdirectional control valve (9);
Under second working state; First oil outlet of said first hydraulicdirectional control valve (9) is communicated with the filler opening of said first hydraulicdirectional control valve (9), and second oil outlet of said first hydraulicdirectional control valve (9) is communicated with the return opening of said first hydraulicdirectional control valve (9);
Under the 3rd working state; First oil outlet of said first hydraulicdirectional control valve (9) is communicated with the return opening of said first hydraulicdirectional control valve (9), and second oil outlet of said first hydraulicdirectional control valve (9) is communicated with the filler opening of said first hydraulicdirectional control valve (9);
Said first solenoid directional control valve (6) comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said first solenoid directional control valve (6) is communicated with the said first pilot pressure oil circuit or is communicated with said hydraulic control proportional flow control valve (5) oil outlet, and the drain tap of said first solenoid directional control valve (6) is communicated with the said first draining oil circuit; First oil outlet of said first solenoid directional control valve (6) and second oil outlet are communicated with first control port and second control port of said first hydraulicdirectional control valve (9) respectively; Said first solenoid directional control valve (6) comprises three kinds of working staties of said first hydraulicdirectional control valve of control (9) execution different operating state:
Under first kind of working state, the drain tap of said first solenoid directional control valve (6) is communicated with first control port and second control port of said first hydraulicdirectional control valve (9) respectively through first oil outlet and second oil outlet of said first solenoid directional control valve (6);
Under second kind of working state, the filler opening of said first solenoid directional control valve (6) is communicated with second control port of said first hydraulicdirectional control valve (9) through first oil outlet of said first solenoid directional control valve (6); The drain tap of said first solenoid directional control valve (6) is communicated with first control port of said first hydraulicdirectional control valve (9) through second oil outlet of said first solenoid directional control valve (6);
Under the third working state, the filler opening of said first solenoid directional control valve (6) is communicated with first control port of said first hydraulicdirectional control valve (9) through second oil outlet of said first solenoid directional control valve (6); The drain tap of said first solenoid directional control valve (6) is communicated with second control port of said first hydraulicdirectional control valve (9) through first oil outlet of said first solenoid directional control valve (6).
7. according to the said hydraulic system of claim 6, it is characterized in that said first solenoid directional control valve (6) is a three position four-way electromagnetic valve; And/or
Said first hydraulicdirectional control valve (9) is the 3-position 4-way hydraulic operated valve; And/or
The said first load feedback oil circuit is provided with first one-way valve (1), and the filler opening of said first one-way valve (1) is communicated with the oil outlet of said hydraulic control proportional flow control valve (5).
8. according to each said hydraulic system of claim 1-7, it is characterized in that said switch selector valve group comprises:
The second oil-feed oil circuit;
Second oil return circuit;
The second load feedback oil circuit;
The second draining oil circuit;
Second working oil path; And
With the series flow control valve (8) that the said second oil-feed oil circuit is communicated with, said series flow control valve (8) is used to regulate the second oil-feed oil circuit flow, makes the second actuating mechanism operating rate stable;
The second switching-over assembly that is communicated with the said second oil-feed oil circuit, said second oil return circuit, the said second load feedback oil circuit, the said second draining oil circuit and said second working oil path; The second switching-over assembly is through the adjusting that commutates of the oil circuit to series flow control valve (8) output, with the control of realization to second working oil path.
9. said according to Claim 8 hydraulic system is characterized in that, the said second load feedback oil circuit comprises the first reverse feedback oil pipe and the second reverse feedback oil pipe;
The first feedback oil pipe of the said second load feedback oil circuit is provided with second one-way valve (11), and the filler opening of said second one-way valve is communicated with first hydraulic fluid port of said second working oil path;
The second feedback oil pipe of the said second load feedback oil circuit is provided with the 3rd one-way valve (12), and the filler opening of said the 3rd one-way valve is communicated with second hydraulic fluid port of said second working oil path.
10. according to the said hydraulic system of claim 9, it is characterized in that the said second switching-over assembly comprises:
The second hydraulic pressure reversing unit that is communicated with said series flow control valve (8);
The solenoid directional control valve group that is communicated with the said second hydraulic pressure reversing unit.
11., it is characterized in that said solenoid directional control valve group comprises second solenoid directional control valve (7) and the 3rd solenoid directional control valve (71) according to the said hydraulic system of claim 10;
The said second hydraulic pressure reversing unit comprises:
The 5th logical valve (25), its first hydraulic fluid port is communicated with said series flow control valve (8) oil outlet; Second hydraulic fluid port of said the 5th logical valve (25) is communicated with second hydraulic fluid port of described second working oil path;
The 6th logical valve (26), its first hydraulic fluid port is communicated with said series flow control valve (8) oil outlet; Second hydraulic fluid port of said the 6th logical valve (26) is communicated with first hydraulic fluid port of described second working oil path;
The 7th logical valve (27), its first hydraulic fluid port is communicated with said second oil return circuit; Second hydraulic fluid port of said the 7th logical valve (27) is communicated with second hydraulic fluid port of described second working oil path;
The 8th logical valve (28), its first hydraulic fluid port is communicated with said second oil return circuit; Second hydraulic fluid port of said the 8th logical valve (28) is communicated with first hydraulic fluid port of described second working oil path; Wherein
Said second solenoid directional control valve (7) comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said second solenoid directional control valve (7) is communicated with the said second oil-feed oil circuit; The drain tap of said second solenoid directional control valve (7) is communicated with the said second draining oil circuit, and first oil outlet of said second solenoid directional control valve (7) is communicated with the control port of said the 5th logical valve (25); Second oil outlet of said second solenoid directional control valve (7) is communicated with the control port of said the 7th logical valve (27); Said second solenoid directional control valve (7) comprises two kinds of working staties:
Under first kind of working state, the filler opening of said second solenoid directional control valve (7) is communicated with the control port of said the 5th logical valve (25) through first oil outlet of said second solenoid directional control valve (7); The drain tap of said second solenoid directional control valve (7) is communicated with the control port of said the 7th logical valve (27) through second oil outlet of said second solenoid directional control valve (7);
Under second kind of working state, the filler opening of said second solenoid directional control valve (7) is communicated with the control port of said the 7th logical valve (27) through second oil outlet of said second solenoid directional control valve (7); The drain tap of said second solenoid directional control valve (7) is communicated with the control port of said the 5th logical valve (25) through first oil outlet of said second solenoid directional control valve (7);
Said the 3rd solenoid directional control valve (71) comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said the 3rd solenoid directional control valve (71) is communicated with the said second oil-feed oil circuit, and the drain tap of said the 3rd solenoid directional control valve (71) is communicated with the said second draining oil circuit; First oil outlet of said the 3rd solenoid directional control valve (71) is communicated with the control port of said the 6th logical valve (26); Second oil outlet of said the 3rd solenoid directional control valve (71) is communicated with the control port of said the 8th logical valve (28); Said the 3rd solenoid directional control valve (71) comprises said the 3rd solenoid directional control valve (71) first working staties and second working state with said second solenoid directional control valve (7) first working staties and the second working state collaborative work, wherein,
Said the 3rd solenoid directional control valve (71) first working staties comprise that the filler opening of said the 3rd solenoid directional control valve (71) is communicated with the control port of said the 6th logical valve (26) through first oil outlet of said the 3rd solenoid directional control valve (71); The drain tap of said the 3rd solenoid directional control valve (71) is communicated with the control port of said the 8th logical valve (28) through second oil outlet of said the 3rd solenoid directional control valve (71);
Said the 3rd solenoid directional control valve (71) second working staties comprise that the filler opening of said the 3rd solenoid directional control valve (71) is communicated with the control port of said the 8th logical valve (28) through second oil outlet of said the 3rd solenoid directional control valve (71); The drain tap of said the 3rd solenoid directional control valve (71) is communicated with the control port of said the 6th logical valve (26) through first oil outlet of said the 3rd solenoid directional control valve (71).
12., it is characterized in that said second solenoid directional control valve (7) is a two-position four-way solenoid valve according to the said hydraulic system of claim 11, and/or
Said the 3rd solenoid directional control valve (71) is a two-position four-way solenoid valve.
13. according to the said hydraulic system of claim 10, it is characterized in that,
Said switch selector valve group also comprises the second pilot pressure oil circuit;
Said solenoid directional control valve group comprises the 4th solenoid directional control valve (61);
The said second hydraulic pressure reversing unit comprises:
Second hydraulicdirectional control valve (91) comprises filler opening, return opening, first control port, second control port, first oil outlet and second oil outlet; The filler opening of said second hydraulicdirectional control valve (91) is communicated with said series flow control valve (8) oil outlet; The return opening of said second hydraulicdirectional control valve (91) is communicated with said second oil return circuit; First oil outlet of said second hydraulicdirectional control valve (91) and second oil outlet are communicated with first hydraulic fluid port and second hydraulic fluid port of said second working oil path respectively; Said second hydraulicdirectional control valve (91) comprises three working staties:
Under first working state, first oil outlet of said second hydraulicdirectional control valve (91) and second oil outlet are communicated with the return opening of said second hydraulicdirectional control valve (91);
Under second working state; First oil outlet of said second hydraulicdirectional control valve (91) is communicated with the filler opening of said second hydraulicdirectional control valve (91), and second oil outlet of said second hydraulicdirectional control valve (91) is communicated with the return opening of said second hydraulicdirectional control valve (91);
Under the 3rd working state; First oil outlet of said second hydraulicdirectional control valve (91) is communicated with the return opening of said second hydraulicdirectional control valve (91), and second oil outlet of said second hydraulicdirectional control valve (91) is communicated with the filler opening of said second hydraulicdirectional control valve (91);
Said the 4th solenoid directional control valve (61) comprises filler opening, drain tap, first oil outlet and second oil outlet; The filler opening of said the 4th solenoid directional control valve (61) is communicated with the said second pilot pressure oil circuit or is communicated with said series flow control valve (8) oil outlet, and the drain tap of said the 4th solenoid directional control valve (61) is communicated with the said second draining oil circuit; First oil outlet of said the 4th solenoid directional control valve (61) and second oil outlet are communicated with first control port and second control port of said second hydraulicdirectional control valve (91) respectively; Said the 4th solenoid directional control valve (61) comprises three kinds of working staties of said second hydraulicdirectional control valve of control (91) execution different operating state:
Under first kind of working state, the drain tap of said the 4th solenoid directional control valve (61) is communicated with first control port and second control port of said second hydraulicdirectional control valve (91) respectively through first oil outlet and second oil outlet of said the 4th solenoid directional control valve (61);
Under second kind of working state, the filler opening of said the 4th solenoid directional control valve (61) is communicated with second control port of said second hydraulicdirectional control valve (91) through first oil outlet of said the 4th solenoid directional control valve (61); The drain tap of said the 4th solenoid directional control valve (61) is communicated with first control port of said second hydraulicdirectional control valve (91) through second oil outlet of said the 4th solenoid directional control valve (61);
Under the third working state, the filler opening of said the 4th solenoid directional control valve (61) is communicated with first control port of said second hydraulicdirectional control valve (91) through second oil outlet of said the 4th solenoid directional control valve (61); The drain tap of said the 4th solenoid directional control valve (61) is communicated with second control port of said second hydraulicdirectional control valve (91) through first oil outlet of said the 4th solenoid directional control valve (61).
14., it is characterized in that said the 4th solenoid directional control valve (61) is a three position four-way electromagnetic valve according to the said hydraulic system of claim 13; And/or
Said second hydraulicdirectional control valve (91) is the 3-position 4-way hydraulic operated valve.
15. a development machine is characterized in that, said development machine is provided with each said hydraulic system of claim 1-14.
16., it is characterized in that said first actuating mechanism comprises: cutterhead up-down, angling cylinder, running motor according to the said development machine of claim 15;
Said second actuating mechanism comprises: shovel plate 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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CN103398034A (en) * 2013-08-15 2013-11-20 中机美诺科技股份有限公司 Hydraulic control system applicable to potato seeder
WO2014005396A1 (en) * 2012-07-02 2014-01-09 三一重型装备有限公司 Hydraulic system and excavator
CN105201951A (en) * 2015-10-16 2015-12-30 浙江大学 High-efficiency high-precision controllable-flow TBM (tunnel boring machine) support hydraulic system
CN109578391A (en) * 2018-11-30 2019-04-05 武汉船用机械有限责任公司 A kind of electric-hydraulic proportion integrated manipulator and its control method
CN109733473A (en) * 2019-02-21 2019-05-10 扬州盛达特种车有限公司 A kind of vehicle active safe driving steering system
CN110159602A (en) * 2018-02-16 2019-08-23 费斯托股份有限两合公司 Customer controls equipment and control method
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