CN202707654U - Hydraulic system and heading machine - Google Patents

Hydraulic system and heading machine Download PDF

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Publication number
CN202707654U
CN202707654U CN 201220316245 CN201220316245U CN202707654U CN 202707654 U CN202707654 U CN 202707654U CN 201220316245 CN201220316245 CN 201220316245 CN 201220316245 U CN201220316245 U CN 201220316245U CN 202707654 U CN202707654 U CN 202707654U
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China
Prior art keywords
control valve
communicated
valve
solenoid directional
oil
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CN 201220316245
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Chinese (zh)
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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Priority to CN 201220316245 priority Critical patent/CN202707654U/en
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Abstract

The utility model relates to the technical field of engineering machinery, disclosing a hydraulic system and a heading machine. The hydraulic system comprises a proportional directional valve assembly for controlling a first motion mechanism needing speed regulation to work, and a switch reversing valve assembly for controlling a second motion mechanism without needing speed regulation to work. The motion mechanisms are divided into two classes, one class is the first motion mechanism needing regulating the working speed, the first motion mechanism is controlled through the proportional directional valve assembly, and the first motion mechanism is regulated according to needs, the other class is the second motion mechanism without regulating the working speed, the second motion mechanism is controlled through the switch reversing valve assembly, and realizes that the second motion mechanism stably works. According to the hydraulic system and the heading machine, the problems of low efficiency, complex loop and high element cost of the traditional hydraulic system can be effectively solved.

Description

A kind of hydraulic system and development machine
Technical field
The utility model relates to technical field of engineering machinery, particularly relates 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 actuator's movement velocity and moving direction usually, but some does not need the actuator of speed governing to use too identical oil circuit control, cause unnecessary waste, for example, the hydraulic control device that development machine adopts is to be load sensing multi-way valve mostly, is used for moving direction and the speed of control actuator, and its control mode is manually to control or Hydraulic guide 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 determines by the opening area of main valve plug with by the main valve plug pressure reduction that pressure compensator determines.
Adopt the HYDRAULIC CONTROL SYSTEM shovel plate oil cylinder, rear support oil cylinder etc. of split blade type load sensing multi-way valve not need the mechanism of speed governing, cause that hydraulic system efficient is low, the loop is complicated, element high in cost of production shortcoming.
Therefore, how improving for existing hydraulic system, in order to 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.
The model utility content
In view of this, the utility model 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 utility model provides a kind of hydraulic system, comprising:
Being used for control needs the proportional reversing valve group of the first actuating mechanism work of speed governing;
Being used for control does not need the switch selector valve group of the second actuating mechanism work of speed governing.
Further, described proportional reversing valve group comprises: the first oil-feed oil circuit;
The first pilot pressure oil circuit;
The first oil return circuit;
The first load feedback oil circuit;
The first draining oil circuit;
The first working oil path; And,
The throttle grverning assembly that is communicated with described the first oil-feed oil circuit, described the first pilot pressure oil circuit and described the first draining oil circuit; The throttle grverning assembly carries out throttle grverning control by the first pilot pressure oil circuit to the first oil-feed oil circuit;
The the first commutation assembly that is communicated with described the first oil return circuit, described the first draining oil circuit, described the first working oil path and described throttle grverning assembly; The first commutation assembly is by adjustings that commutate of the oil circuit to throttle grverning assembly output, with the control of realization to the first working oil path.
Further, described throttle grverning assembly comprises:
Pressure compensator, described pressure compensator comprise filler opening, oil outlet, the first compensation oil circuit and and the second compensation oil circuit, the filler opening of described pressure compensator is communicated with described the first oil-feed oil circuit;
The hydraulic control proportional flow control valve, described hydraulic control proportional flow control valve comprises filler opening, oil outlet, control port and drain tap, the first compensation oil circuit of described pressure compensator and the second compensation oil circuit are communicated with respectively filler opening and the oil outlet at described hydraulic control proportional flow control valve; The filler opening of described hydraulic control proportional flow control valve is communicated with described pressure compensator oil outlet; The drain tap of described hydraulic control proportional flow control valve is communicated with described the first draining oil circuit; Be used for regulating the solenoid-operated proportional reduction valve of described hydraulic control proportional flow control valve flow; Described solenoid-operated proportional reduction valve comprises filler opening, oil outlet and Electromagnetic Control end, the filler opening of described solenoid-operated proportional reduction valve is communicated with described the first pilot pressure oil circuit, the oil outlet of described solenoid-operated proportional reduction valve is communicated with the control port of described hydraulic control proportional flow control valve, the Electromagnetic Control end external controller of described solenoid-operated proportional reduction valve.
Further, described the first commutation assembly comprises:
The the first hydraulic pressure reversing unit that is communicated with described hydraulic control proportional flow control valve oil outlet;
The first solenoid directional control valve that is communicated with described the first hydraulic pressure reversing unit.
Further, described the first hydraulic pressure reversing unit comprises:
The first logical valve, its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve oil outlet, and the second hydraulic fluid port of described the first logical valve is communicated with the second hydraulic fluid port of described the first working oil path;
The second logical valve, its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve oil outlet, and the second hydraulic fluid port of described the second logical valve is communicated with the first hydraulic fluid port of described the first working oil path;
The 3rd logical valve, its first hydraulic fluid port is communicated with described the first oil return circuit, and the second hydraulic fluid port of described the 3rd logical valve is communicated with the second hydraulic fluid port of described the first working oil path;
The 4th logical valve, its first hydraulic fluid port is communicated with described the first oil return circuit, and the second hydraulic fluid port of described the 4th logical valve is communicated with the first hydraulic fluid port of described the first working oil path; Wherein
Described the first solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described the first solenoid directional control valve is communicated with described hydraulic control proportional flow control valve oil outlet, and the drain tap of described the first solenoid directional control valve is communicated with described the first draining oil circuit; The first oil outlet of described the first solenoid directional control valve is communicated with the control port of the control port of described the first logical valve and described the 4th logical valve; The second oil outlet of described the first solenoid directional control valve is communicated with the control port of the control port of described the second logical valve and described the 3rd logical valve; Described the first solenoid directional control valve comprises three kinds of working staties:
Under the first working state, the drain tap of described the first solenoid directional control valve is communicated with the control port of the control port of the control port of described the first logical valve, described the second logical valve, described the 3rd logical valve and the control port of described the 4th logical valve respectively by the first oil outlet and second oil outlet of described the first solenoid directional control valve;
Under the second working state, the filler opening of described the first solenoid directional control valve is communicated with the control port of described the first logical valve and the control port of described the 4th logical valve by the first oil outlet of described the first solenoid directional control valve; The drain tap of described the first solenoid directional control valve is communicated with the control port of described the second logical valve and the control port of described the 3rd logical valve by the second oil outlet of described the first solenoid directional control valve;
Under the third working state, the filler opening of described the first solenoid directional control valve is communicated with the control port of described the second logical valve and the control port of described the 3rd logical valve by the second oil outlet of described the first solenoid directional control valve; The drain tap of described the first solenoid directional control valve is communicated with the control port of described the first logical valve and the control port of described the 4th logical valve by the first oil outlet of described the first solenoid directional control valve.
Further, described the first hydraulic pressure reversing unit comprises:
The first hydraulicdirectional control valve comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of described the first hydraulicdirectional control valve is communicated with described hydraulic control proportional flow control valve oil outlet; The return opening of described the first hydraulicdirectional control valve is communicated with described the first oil return circuit; The first oil outlet of described the first hydraulicdirectional control valve and the second oil outlet are communicated with the first hydraulic fluid port and second hydraulic fluid port of described the first working oil path respectively; Described the first hydraulicdirectional control valve comprises three working staties:
Under the first working state, the first oil outlet of described the first hydraulicdirectional control valve and the second oil outlet are communicated with the return opening of described the first hydraulicdirectional control valve;
Under the second working state, the first oil outlet of described the first hydraulicdirectional control valve is communicated with the filler opening of described the first hydraulicdirectional control valve, and the second oil outlet of described the first hydraulicdirectional control valve is communicated with the return opening of described the first hydraulicdirectional control valve;
Under the 3rd working state, the first oil outlet of described the first hydraulicdirectional control valve is communicated with the return opening of described the first hydraulicdirectional control valve, and the second oil outlet of described the first hydraulicdirectional control valve is communicated with the filler opening of described the first hydraulicdirectional control valve;
Described the first solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described the first solenoid directional control valve is communicated with described the first pilot pressure oil circuit or is communicated with described hydraulic control proportional flow control valve oil outlet, and the drain tap of described the first solenoid directional control valve is communicated with described the first draining oil circuit; The first oil outlet of described the first solenoid directional control valve and the second oil outlet are communicated with the first control port and second control port of described the first hydraulicdirectional control valve respectively; Described the first solenoid directional control valve comprises three kinds of working staties of described the first hydraulicdirectional control valve execution of control different operating state:
Under the first working state, the drain tap of described the first solenoid directional control valve is communicated with the first control port and second control port of described the first hydraulicdirectional control valve respectively by the first oil outlet and second oil outlet of described the first solenoid directional control valve;
Under the second working state, the filler opening of described the first solenoid directional control valve is communicated with the second control port of described the first hydraulicdirectional control valve by the first oil outlet of described the first solenoid directional control valve; The drain tap of described the first solenoid directional control valve is communicated with the first control port of described the first hydraulicdirectional control valve by the second oil outlet of described the first solenoid directional control valve;
Under the third working state, the filler opening of described the first solenoid directional control valve is communicated with the first control port of described the first hydraulicdirectional control valve by the second oil outlet of described the first solenoid directional control valve; The drain tap of described the first solenoid directional control valve is communicated with the second control port of described the first hydraulicdirectional control valve by the first oil outlet of described the first solenoid directional control valve.
Further, described the first solenoid directional control valve is three position four-way electromagnetic valve; And/or
Described the first hydraulicdirectional control valve is the 3-position 4-way hydraulic operated valve; And/or
Described the first load feedback oil circuit is provided with the first one-way valve, and the filler opening of described the first one-way valve is communicated with the oil outlet of described hydraulic control proportional flow control valve.
Further, described switch selector valve group comprises:
The second oil-feed oil circuit;
The second oil return circuit;
The second load feedback oil circuit;
The second draining oil circuit;
The second working oil path; And
With the series flow control valve that described the second oil-feed oil circuit is communicated with, described series flow control valve is used for regulating the second oil-feed oil circuit flow, makes the second actuating mechanism operating rate stable;
The the second commutation assembly that is communicated with described the second oil-feed oil circuit, described the second oil return circuit, described the second load feedback oil circuit, described the second draining oil circuit and described the second working oil path, the second commutation assembly is by adjustings that commutate of the oil circuit to series flow control valve output, with the control of realization to the second working oil path.
Further, described the second load feedback oil circuit comprises the first reverse feedback oil pipe and the second reverse feedback oil pipe;
Be provided with the second one-way valve on the first feedback oil pipe of described the second load feedback oil circuit, the filler opening of described the second one-way valve is communicated with the first hydraulic fluid port of described the second working oil path;
Be provided with the 3rd one-way valve on the second feedback oil pipe of described the second load feedback oil circuit, the filler opening of described the 3rd one-way valve is communicated with the second hydraulic fluid port of described the second working oil path.
Further, described the second commutation assembly comprises:
The the second hydraulic pressure reversing unit that is communicated with described series flow control valve;
The solenoid directional control valve group that is communicated with described the second hydraulic pressure reversing unit.
Further, described solenoid directional control valve group comprises the second solenoid directional control valve and the 3rd solenoid directional control valve;
Described the second hydraulic pressure reversing unit comprises:
The 5th logical valve, its first hydraulic fluid port is communicated with described series flow control valve oil outlet; The second hydraulic fluid port of described the 5th logical valve is communicated with the second hydraulic fluid port of described the second working oil path;
The 6th logical valve, its first hydraulic fluid port is communicated with described series flow control valve oil outlet; The second hydraulic fluid port of described the 6th logical valve is communicated with the first hydraulic fluid port of described the second working oil path;
The 7th logical valve, its first hydraulic fluid port is communicated with described the second oil return circuit; The second hydraulic fluid port of described the 7th logical valve is communicated with the second hydraulic fluid port of described the second working oil path;
The 8th logical valve, its first hydraulic fluid port is communicated with described the second oil return circuit; The second hydraulic fluid port of described the 8th logical valve is communicated with the first hydraulic fluid port of described the second working oil path; Wherein
Described the second solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet, the filler opening of described the second solenoid directional control valve is communicated with described the second oil-feed oil circuit, the drain tap of described the second solenoid directional control valve is communicated with described the second draining oil circuit, and the first oil outlet of described the second solenoid directional control valve is communicated with the control port of described the 5th logical valve; The second oil outlet of described the second solenoid directional control valve is communicated with the control port of described the 7th logical valve; Described the second solenoid directional control valve comprises two kinds of working staties:
Under the first working state, the filler opening of described the second solenoid directional control valve is communicated with the control port of described the 5th logical valve by the first oil outlet of described the second solenoid directional control valve; The drain tap of described the second solenoid directional control valve is communicated with the control port of described the 7th logical valve by the second oil outlet of described the second solenoid directional control valve;
Under the second working state, the filler opening of described the second solenoid directional control valve is communicated with the control port of described the 7th logical valve by the second oil outlet of described the second solenoid directional control valve; The drain tap of described the second solenoid directional control valve is communicated with the control port of described the 5th logical valve by the first oil outlet of described the second solenoid directional control valve;
Described the 3rd solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet, the filler opening of described the 3rd solenoid directional control valve is communicated with described the second oil-feed oil circuit, and the drain tap of described the 3rd solenoid directional control valve is communicated with described the second draining oil circuit; The first oil outlet of described the 3rd solenoid directional control valve is communicated with the control port of described the 6th logical valve; The second oil outlet of described the 3rd solenoid directional control valve is communicated with the control port of described the 8th logical valve; Described the 3rd solenoid directional control valve comprises described the 3rd solenoid directional control valve the first working state and the second working state with described the second solenoid directional control valve the first working state and the second working state collaborative work, wherein,
Described the 3rd solenoid directional control valve the first working state comprises that the filler opening of described the 3rd solenoid directional control valve is communicated with the control port of described the 6th logical valve by the first oil outlet of described the 3rd solenoid directional control valve; The drain tap of described the 3rd solenoid directional control valve is communicated with the control port of described the 8th logical valve by the second oil outlet of described the 3rd solenoid directional control valve;
Described the 3rd solenoid directional control valve the second working state comprises that the filler opening of described the 3rd solenoid directional control valve is communicated with the control port of described the 8th logical valve by the second oil outlet of described the 3rd solenoid directional control valve; The drain tap of described the 3rd solenoid directional control valve is communicated with the control port of described the 6th logical valve by the first oil outlet of described the 3rd solenoid directional control valve.
Further, described the second solenoid directional control valve is two-position four-way solenoid valve, and/or
Described the 3rd solenoid directional control valve is two-position four-way solenoid valve.
Further, described switch selector valve group also comprises the second pilot pressure oil circuit;
Described solenoid directional control valve group comprises the 4th solenoid directional control valve;
Described the second hydraulic pressure reversing unit comprises:
The second hydraulicdirectional control valve comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of described the second hydraulicdirectional control valve is communicated with described series flow control valve oil outlet; The return opening of described the second hydraulicdirectional control valve is communicated with described the second oil return circuit; The first oil outlet of described the second hydraulicdirectional control valve and the second oil outlet are communicated with the first hydraulic fluid port and second hydraulic fluid port of described the second working oil path respectively; Described the second hydraulicdirectional control valve comprises three working staties:
Under the first working state, the first oil outlet of described the second hydraulicdirectional control valve and the second oil outlet are communicated with the return opening of described the second hydraulicdirectional control valve;
Under the second working state, the first oil outlet of described the second hydraulicdirectional control valve is communicated with the filler opening of described the second hydraulicdirectional control valve, and the second oil outlet of described the second hydraulicdirectional control valve is communicated with the return opening of described the second hydraulicdirectional control valve;
Under the 3rd working state, the first oil outlet of described the second hydraulicdirectional control valve is communicated with the return opening of described the second hydraulicdirectional control valve, and the second oil outlet of described the second hydraulicdirectional control valve is communicated with the filler opening of described the second hydraulicdirectional control valve;
Described the 4th solenoid directional control valve comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described the 4th solenoid directional control valve is communicated with described the second pilot pressure oil circuit or is communicated with described series flow control valve oil outlet, and the drain tap of described the 4th solenoid directional control valve is communicated with described the second draining oil circuit; The first oil outlet of described the 4th solenoid directional control valve and the second oil outlet are communicated with the first control port and second control port of described the second hydraulicdirectional control valve respectively; Described the 4th solenoid directional control valve comprises three kinds of working staties of described the second hydraulicdirectional control valve execution of control different operating state:
Under the first working state, the drain tap of described the 4th solenoid directional control valve is communicated with the first control port and second control port of described the second hydraulicdirectional control valve respectively by the first oil outlet and second oil outlet of described the 4th solenoid directional control valve;
Under the second working state, the filler opening of described the 4th solenoid directional control valve is communicated with the second control port of described the second hydraulicdirectional control valve by the first oil outlet of described the 4th solenoid directional control valve; The drain tap of described the 4th solenoid directional control valve is communicated with the first control port of described the second hydraulicdirectional control valve by the second oil outlet of described the 4th solenoid directional control valve;
Under the third working state, the filler opening of described the 4th solenoid directional control valve is communicated with the first control port of described the second hydraulicdirectional control valve by the second oil outlet of described the 4th solenoid directional control valve; The drain tap of described the 4th solenoid directional control valve is communicated with the second control port of described the second hydraulicdirectional control valve by the first oil outlet of described the 4th solenoid directional control valve.
Further, described the 4th solenoid directional control valve is three position four-way electromagnetic valve; And/or
Described the second hydraulicdirectional control valve is the 3-position 4-way hydraulic operated valve.
According on the other hand of the present utility model, the utility model also provides a kind of development machine, and described development machine is provided with above-mentioned each described hydraulic system.
Further, described the first actuating mechanism comprises: cutterhead lifting, angling cylinder, running motor; Described the second actuating mechanism comprises: shovel board and back support frame.
The utility model provides a kind of hydraulic system, comprising: be used for the proportional reversing valve group that control needs the first actuating mechanism work of speed governing; Being used for control does not need the switch selector valve group of the second actuating mechanism work of speed governing.Actuating mechanism is divided into two classes, one class is the first actuating mechanism that needs to regulate operating rate, the control of the first actuating mechanism passing ratio selector valve group, can regulate as required the first actuating mechanism, another kind of is the second actuating mechanism that does not need to regulate operating rate, the second actuating mechanism realizes the second actuating mechanism smooth working by the control of switch selector valve group, and the utility model 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 among the utility model embodiment;
Fig. 2 is the hydraulic principle schematic representation of proportional reversing valve prescription case two among the utility model embodiment;
Fig. 3 is the hydraulic principle schematic representation of switch selector valve prescription case one among the utility model embodiment;
Fig. 4 is the hydraulic principle schematic representation of switch selector valve prescription case two among the utility model embodiment.
Description of reference numerals: 1, the first one-way valve; 11, the second one-way valve; 12, the 3rd one-way valve; 21, the first logical valve; 22, the second logical valve; 23, the 3rd logical valve; 24, the 4th logical valve; 25, the 5th logical valve; 26, the 6th logical valve; 27, the 7th logical valve; 28, the 8th logical valve; 3, solenoid-operated proportional reduction valve; 4, pressure compensator; 5, hydraulic control proportional flow control valve; 6, the first solenoid directional control valve; 61, the 4th solenoid directional control valve; 7, the second solenoid directional control valve; 71, the 3rd solenoid directional control valve; 8, series flow control valve; 9, the first hydraulicdirectional control valve; 91, the second hydraulicdirectional control valve.
Embodiment
In order to make those skilled in the art understand better the technical solution of the utility model, the utility model is described in further detail below in conjunction with the drawings and specific embodiments.Should be pointed out that in this part that to the description of concrete structure and description order only be explanation to specific embodiment, should not be considered as that protection domain of the present utility model is had any restriction.
Because the utility model is to be combined by proportional reversing valve group and switch selector valve group, and the proportional reversing valve group that the utility model embodiment provides and each two schemes of switch selector valve group; So can be combined into four kinds of embodiments of the present utility model, the below describes mainly for each scheme of proportional reversing valve group and switch selector valve group.
The utility model provides a kind of hydraulic system, comprising: be used for the proportional reversing valve group that control needs the first actuating mechanism work of speed governing; Being used for control does not need the switch selector valve group of the second actuating mechanism work of speed governing.Actuating mechanism is divided into two classes, and a class is the first actuating mechanism that needs to regulate operating rate, and the first actuating mechanism passing ratio selector valve group is controlled, and can regulate by the throttle grverning element of regulating the proportional reversing valve group operating rate of the first actuating mechanism.Another kind of is the second actuating mechanism that does not need to regulate operating rate, and the second actuating mechanism can realize steadily moving according to predetermined speed by 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 the first actuating mechanism and the second actuating mechanism are separately carried out hydraulic control,
Wherein, as shown in Figure 1, it is the principle schematic of proportional reversing valve prescription case one among the figure, the proportional reversing valve group of two parallel connections shown in the figure, solid line is transmission fluid force feed 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; The first oil return circuit, the 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; The first working oil path, the 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 by the first pilot pressure oil circuit to the first oil-feed oil circuit; With the first oil return circuit, state the first commutation assembly that the first draining oil circuit, the first working oil path and throttle grverning assembly be communicated with.The first commutation assembly is by adjustings that commutate of the oil circuit to throttle grverning assembly output, with the control of realization to the first working oil path.
Wherein the throttle grverning assembly can be related domain speed governing element commonly used, and the first commutation 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, the faults such as spool clamping stagnation appear easily, the contamination resistance of system is poor, oil-feed place of the utility model hydraulic system arranges 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 Systems balanth.
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 described the 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 described pressure compensator 4 and the second compensation oil circuit are communicated with respectively filler opening and the oil outlet at described hydraulic control proportional flow control valve 5; The filler opening of described hydraulic control proportional flow control valve 5 is communicated with described pressure compensator oil outlet; The drain tap of described hydraulic control proportional flow control valve 5 is communicated with described the first draining oil circuit;
Solenoid-operated proportional reduction valve 3 is used for regulating 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 fine adjustment hydraulic control proportional flow control valve flow.
In addition, the first commutation assembly comprises: the first hydraulic pressure reversing unit that is communicated with described hydraulic control proportional flow control valve 5; The first solenoid directional control valve 6 that is communicated with described the first hydraulic pressure reversing unit.
As shown in Figure 1, the first hydraulic pressure reversing unit comprises: the first logical valve 21, and its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve 5 oil outlets, and the second hydraulic fluid port of the first logical valve 21 is communicated with the second hydraulic fluid port of described the first working oil path; The second logical valve 22, its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve 5 oil outlets, and the second hydraulic fluid port of described the second logical valve 22 is communicated with the first hydraulic fluid port of described the first working oil path; The 3rd logical valve 23, its first hydraulic fluid port is communicated with described the first oil return circuit, and the second hydraulic fluid port of described the 3rd logical valve 23 is communicated with the second hydraulic fluid port of described the first working oil path; The 4th logical valve 24, its first hydraulic fluid port is communicated with described the first oil return circuit, and the second hydraulic fluid port of described the 4th logical valve 24 is communicated with the first hydraulic fluid port of described the first working oil path;
Wherein, the first solenoid directional control valve 6 comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of the first solenoid directional control valve 6 is communicated with hydraulic control proportional flow control valve 5 oil outlets, and the drain tap of the first solenoid directional control valve 6 is communicated with the first draining oil circuit; The first oil outlet of described the first solenoid directional control valve 6 is communicated with the control port of the control port of described the first logical valve 21 and described the 4th logical valve 24; The second oil outlet of described the first solenoid directional control valve 6 is communicated with the control port of the control port of described the second logical valve 22 and described the 3rd logical valve 23; The first solenoid directional control valve 6 comprises three kinds of working staties:
Under the first working state, the drain tap of the first solenoid directional control valve 6 is communicated with the control port of the first logical valve 21, the control port of the second logical valve 22, the control port of the 3rd logical valve 23 and the control port of the 4th logical valve 24 respectively by the first oil outlet and second oil outlet of described the first solenoid directional control valve 6.
Under the second working state, the filler opening of the first solenoid directional control valve 6 is communicated with the control port of the first logical valve 21 and the control port of the 4th logical valve 24 by the first oil outlet of the first solenoid directional control valve 6; The drain tap of the first solenoid directional control valve 6 is communicated with the control port of the second logical valve 22 and the control port of the 3rd logical valve 23 by the second oil outlet of the first solenoid directional control valve 6.
Under the third working state, the filler opening of the first solenoid directional control valve 6 is communicated with the control port of the second logical valve 22 and the control port of the 3rd logical valve 23 by the second oil outlet of the first solenoid directional control valve 6; The drain tap of the first solenoid directional control valve 6 is communicated with the control port of the first logical valve 21 and the control port of the 4th logical valve 24 by the first oil outlet of the first solenoid directional control valve 6.
The first solenoid directional control valve 6 is three position four-way electromagnetic valve among Fig. 1; The first solenoid directional control valve 6 is the first working state when being in meta, and A1, B1 oil hydraulic circuit are closed; The first solenoid directional control valve 6 is the second working state when being in left position, and the A1 mouth is the filler opening of actuator, and the B1 mouth is the return opening of actuator; The first solenoid directional control valve 6 is the 3rd working state when being in right position, 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 such as Fig. 2, the throttle grverning modular construction is identical with the structure of scheme one among the figure, and the first commutation assembly comprises: the first hydraulic pressure reversing unit that is communicated with described hydraulic control proportional flow control valve 5; The first solenoid directional control valve 6 that is communicated with described hydraulic pressure reversing unit.
The first hydraulic pressure reversing unit comprises: the first hydraulicdirectional control valve 9, and it comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of the first hydraulicdirectional control valve 9 is communicated with hydraulic control proportional flow control valve 5 oil outlets; The return opening of the first hydraulicdirectional control valve 9 is communicated with the first oil return circuit; The first oil outlet of described the first hydraulicdirectional control valve 9 and the second oil outlet are communicated with the first hydraulic fluid port and second hydraulic fluid port of described the first working oil path respectively; The first hydraulicdirectional control valve 9 comprises three working staties:
Under the first working state, the first oil outlet of the first hydraulicdirectional control valve 9 and the second oil outlet are communicated with the return opening of described the first hydraulicdirectional control valve 9.
Under the second working state, under the 3rd working state, the first oil outlet of the first hydraulicdirectional control valve 9 is communicated with the filler opening of the first hydraulicdirectional control valve 9, and the second oil outlet of the first hydraulicdirectional control valve 9 is communicated with the return opening of the first hydraulicdirectional control valve 9.
Under the 3rd working state, the first oil outlet of the first hydraulicdirectional control valve 9 is communicated with the return opening of the first hydraulicdirectional control valve 9, and the second oil outlet of the first hydraulicdirectional control valve 9 is communicated with the filler opening of the first hydraulicdirectional control valve 9.
The first solenoid directional control valve 6 comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of the first solenoid directional control valve 6 is communicated with described the first pilot pressure oil circuit, and the drain tap of the first solenoid directional control valve 6 is communicated with described the first draining oil circuit; The first oil outlet of described the first solenoid directional control valve 6 and the second oil outlet are communicated with the first control port and second control port of described the first hydraulicdirectional control valve 9 respectively; The first solenoid directional control valve 6 comprises three kinds of working staties of described the first hydraulicdirectional control valve of control 9 execution different operating states:
Under the first working state, the drain tap of described the first solenoid directional control valve 6 is communicated with the first control port and second control port of described the first hydraulicdirectional control valve 9 respectively by the first oil outlet and second oil outlet of described the first solenoid directional control valve 6.
Under the second working state, the filler opening of the first solenoid directional control valve 6 is communicated with the second control port of the first hydraulicdirectional control valve 9 by the first oil outlet of the first solenoid directional control valve 6; The drain tap of the first solenoid directional control valve 6 is communicated with the first control port of the first hydraulicdirectional control valve 9 by the second oil outlet of the first solenoid directional control valve 6.
Under the third working state, the filler opening of described the first solenoid directional control valve 6 is communicated with the first control port of described the first hydraulicdirectional control valve 9 by the second oil outlet of described the first solenoid directional control valve 6; The drain tap of the first solenoid directional control valve 6 is communicated with the second control port of described the first hydraulicdirectional control valve 9 by the first oil outlet of described the first solenoid directional control valve 6.
First control port and second control port of the first solenoid directional control valve 6 by controlling the first hydraulicdirectional control valve 9 is controlled the first hydraulicdirectional control valve 9 and is entered the different operating state, and as shown in Figure 2, the first solenoid directional control valve 6 is three position four-way electromagnetic valve; The first hydraulicdirectional control valve 9 is the 3-position 4-way hydraulic operated valve; In the first solenoid directional control valve 6 the first working state situations (being in meta), the first hydraulicdirectional control valve 9 enters the first working state (being in meta), and A1, B1 oil hydraulic circuit are closed; In the first solenoid directional control valve 6 the second working state situations (being in upper), the first hydraulicdirectional control valve 9 enters the 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; In the first solenoid directional control valve 6 the first working state situations (being in the next), the first hydraulicdirectional control valve 9 enters the 3rd working state (being in left position), 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 the 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 the first hydraulicdirectional control valve 9.Because the first solenoid directional control valve 6 is controlled the first hydraulicdirectional control valve 9 by 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 the 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; The second oil return circuit, the 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; The second working oil path, the 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 described series flow control valve 8 is used for regulating the second oil-feed oil circuit flow, makes the second actuating mechanism operating rate stable; The the second commutation assembly that is communicated with the second oil-feed oil circuit, the second oil return circuit, the second load feedback oil circuit, the second draining oil circuit and the second working oil path, the second commutation assembly is by adjustings that commutate of the oil circuit to series flow control valve 8 output, with the control of realization to the 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 is provided with the second one-way valve 11, the second one-way valves 11 on the first feedback oil pipe of the second load feedback oil circuit is communicated with the first hydraulic fluid port of the second working oil path; The filler opening that is provided with the 3rd one-way valve 12, the three one-way valves 12 on the second feedback oil pipe of the second load feedback oil circuit is communicated with the second oil circuit of described the second working oil path.By feedback oil circuit feedback pressure signal.
Wherein, as shown in Figure 3, the second commutation assembly comprises: the second hydraulic pressure reversing unit that is communicated with described series flow control valve 8; The solenoid directional control valve group that is communicated with described the second hydraulic pressure reversing unit.
The solenoid directional control valve group comprises the 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 described series flow control valve 8 oil outlets; The second hydraulic fluid port of described the 5th logical valve 25 is communicated with the second hydraulic fluid port of described the second working oil path; The 6th logical valve 26, its first hydraulic fluid port is communicated with described series flow control valve 8 oil outlets; The second hydraulic fluid port of described the 6th logical valve 26 is communicated with the first hydraulic fluid port of described the second working oil path; The 7th logical valve 27, its first hydraulic fluid port is communicated with described the second oil return circuit; The second hydraulic fluid port of described the 7th logical valve 27 is communicated with the second hydraulic fluid port of described the second working oil path; The 8th logical valve 28, its first hydraulic fluid port is communicated with described the second oil return circuit; The second hydraulic fluid port of described the 8th logical valve 28 is communicated with the first hydraulic fluid port of described the second working oil path.Wherein:
The second solenoid directional control valve 7 comprises filler opening, drain tap, the first oil outlet and the second oil outlet, and the filler opening of the second solenoid directional control valve 7 is communicated with described the second oil-feed oil circuit, and the drain tap of described the second solenoid directional control valve 7 is communicated with described the second draining oil circuit; The first oil outlet of described the second solenoid directional control valve 7 is communicated with the control port of described the 5th logical valve 25; The second oil outlet of described the second solenoid directional control valve 7 is communicated with the control port of described the 7th logical valve 27; Described the second solenoid directional control valve 7 comprises two kinds of working staties:
Under the first working state, the filler opening of the second solenoid directional control valve 7 is communicated with the control port of the 5th logical valve 25 by the first oil outlet of the second solenoid directional control valve 7; The drain tap of the second solenoid directional control valve 7 is communicated with the control port of the 7th logical valve 27 by the second oil outlet of the second solenoid directional control valve 7.
Under the second working state, the filler opening of the second solenoid directional control valve 7 is communicated with the control port of the 7th logical valve 27 by the second oil outlet of the second solenoid directional control valve 7; The drain tap of the second solenoid directional control valve 7 is communicated with the control port of the 5th logical valve 25 by the first oil outlet of the second solenoid directional control valve 7.
The 3rd solenoid directional control valve 71 comprises filler opening, drain tap, the first oil outlet and the second oil outlet, and the filler opening of the 3rd solenoid directional control valve 71 is communicated with 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; The first oil outlet of described the 3rd solenoid directional control valve 71 is communicated with the control port of described the 6th logical valve 26; The second oil outlet of described the 3rd solenoid directional control valve 71 is communicated with the control port of described the 8th logical valve 28; The 3rd solenoid directional control valve 71 comprises the 3rd solenoid directional control valve 71 first working staties and the second working state with the 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 by the first oil outlet of the 3rd solenoid directional control valve 71; The drain tap of the 3rd solenoid directional control valve 71 is communicated with the control port of described the 8th logical valve 28 by the second oil outlet of described 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 by the second oil outlet of the 3rd solenoid directional control valve 71; The drain tap of the 3rd solenoid directional control valve 71 is communicated with the control port of described the 6th logical valve 26 by the first oil outlet of the 3rd solenoid directional control valve 71.
As shown in Figure 3, the solenoid directional control valve group comprises the second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71; The second solenoid directional control valve 7 is two-position four-way solenoid valve, and the 3rd solenoid directional control valve 71 also is two-position four-way solenoid valve; Collaborative work by the 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 staties, wherein, the first working state of solenoid directional control valve group is, the collaborative work of the first working state of the first working state of the second solenoid directional control valve 7 and the 3rd solenoid directional control valve 71, A3, B3 oil hydraulic circuit are closed at this moment; The second working state of solenoid directional control valve group is, the collaborative work of the first working state of the second working state of the 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 is, the collaborative work of the first working state of the first working state of the 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 commutation assembly comprises: the second hydraulic pressure reversing unit that is communicated with described series flow control valve 8; The solenoid directional control valve group that is communicated with described the 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: the second hydraulicdirectional control valve 91 comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of the second hydraulicdirectional control valve 91 is communicated with described series flow control valve 8 oil outlets; The return opening of the second hydraulicdirectional control valve 91 is communicated with described the second oil return circuit; The first oil outlet of described the second hydraulicdirectional control valve 91 and the second oil outlet are communicated with the first hydraulic fluid port and second hydraulic fluid port of described the first working oil path respectively; Described the second hydraulicdirectional control valve 91 comprises three working staties:
Under the first working state, the first oil outlet of the second hydraulicdirectional control valve 91 and the second oil outlet are communicated with the return opening of described the second hydraulicdirectional control valve 91.
Under the second working state, the first oil outlet of the second hydraulicdirectional control valve 91 is communicated with the filler opening of described the second hydraulicdirectional control valve 91, and the second oil outlet of the second hydraulicdirectional control valve 91 is communicated with the return opening of described the second hydraulicdirectional control valve 91.
Under the 3rd working state, the first oil outlet of the second hydraulicdirectional control valve 91 is communicated with the return opening of described the second hydraulicdirectional control valve 91, and the second oil outlet of described the second hydraulicdirectional control valve 91 is communicated with the filler opening of described the second hydraulicdirectional control valve 91.
The 4th solenoid directional control valve 61 comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of the 4th solenoid directional control valve 61 is communicated with the second pilot pressure oil circuit, and the drain tap of the 4th solenoid directional control valve 61 is communicated with described the second draining oil circuit; The first oil outlet of described the 4th solenoid directional control valve 61 and the second oil outlet are communicated with the first control port and second control port of described the second hydraulicdirectional control valve 91 respectively; The 4th solenoid directional control valve 61 comprises three kinds of working staties of described the second hydraulicdirectional control valve of control 91 execution different operating states:
Under the first working state, the drain tap of the 4th solenoid directional control valve 61 is communicated with the first control port and second control port of the second hydraulicdirectional control valve 91 respectively by the first oil outlet and second oil outlet of the 4th solenoid directional control valve 61;
Under the second working state, the filler opening of the 4th solenoid directional control valve 61 is communicated with the second control port of described the second hydraulicdirectional control valve 91 by the first oil outlet of described the 4th solenoid directional control valve 61; The drain tap of described the 4th solenoid directional control valve 61 is communicated with the first control port of described the second hydraulicdirectional control valve 91 by the second oil outlet of described 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 the first control port of described the second hydraulicdirectional control valve 91 by the second oil outlet of described the 4th solenoid directional control valve 61; The drain tap of described the 4th solenoid directional control valve 61 is communicated with the second control port of described the second hydraulicdirectional control valve 91 by the first oil outlet of described the 4th solenoid directional control valve 61.
First control port and second control port of the 4th solenoid directional control valve 61 by controlling the second hydraulicdirectional control valve 91 is controlled the second hydraulicdirectional control valve 91 and is entered the different operating state, and as shown in Figure 2, the 4th solenoid directional control valve 61 is three position four-way electromagnetic valve; The 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) in the 4th solenoid directional control valve 61 the first working state situations, the second hydraulicdirectional control valve 91 enters the first working state (being in meta), and A3, B3 oil hydraulic circuit are closed; In the 4th solenoid directional control valve 61 the second working state situations (being in upper), the second hydraulicdirectional control valve 91 enters the 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; In the 4th solenoid directional control valve 61 the first working state situations (being in the next), the second hydraulicdirectional control valve 91 enters the 3rd working state (being in left position), 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 the second hydraulicdirectional control valve 91.Because the 4th solenoid directional control valve 61 filler openings are controlled the second hydraulicdirectional control valve 91 by 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 utility model embodiment one is, proportion of utilization selector valve group (scheme one) makes up with switch selector valve group (scheme one), proportional reversing valve group (scheme one) in its concrete composition structure illustrates in the above-described embodiments with the structure of switch selector valve group (scheme one), does not repeat them here.
The utility model embodiment two is, proportion of utilization selector valve group (scheme one) makes up with switch selector valve group (scheme two), proportional reversing valve group (scheme one) in its concrete composition structure illustrates in the above-described embodiments with the structure of switch selector valve group (scheme two), does not repeat them here.
The utility model embodiment three is, proportion of utilization selector valve group (scheme two) makes up with switch selector valve group (scheme one), proportional reversing valve group (scheme two) in its concrete composition structure illustrates in the above-described embodiments with the structure of switch selector valve group (scheme one), does not repeat them here.
The utility model embodiment four is, proportion of utilization selector valve group (scheme two) makes up with switch selector valve group (scheme two), proportional reversing valve group (scheme two) in its concrete composition structure illustrates in the above-described embodiments with the structure of switch selector valve group (scheme two), does not repeat them here.。
Its concrete principle is as follows:
The main hydraulic control of hydraulic system is partly adopted and is concentrated the valve block mode.Concentrate the oil hydraulic circuit quantity of valve piece to determine according to the quantity of corresponding actuator.Have two oil hydraulic circuits proportional reversing valve prescription case one principle as shown in Figure 1, each proportional reversing valve group comprises the first one-way valve 1, logical valve 2, solenoid-operated proportional reduction valve 3, pressure compensator 4, hydraulic control proportional flow control valve 5, the first solenoid directional control valve 6, its external hydraulic fluid port load feedback hydraulic fluid port LS, pilot pressure hydraulic fluid port P1, main oil inlet P, main oil return inlet T, drain tap T1, actuator port A1, B1.
The working principle of proportional reversing valve prescription case one is as follows:
As shown in Figure 1, solid line is transmission fluid force feed circuit among the figure, dotted line is control hydraulic oil circuit, behind the high pressure oil process filter of oil hydraulic pump output, arrive the oil inlet P of proportional reversing valve group, hydraulic oil flow to pressure compensator 4 filler openings in each loop of proportional reversing valve group, pressure compensator 4 has been determined 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 determined by input current, thereby is made hydraulic system have good proportional control characteristic.
Four logical valves (the first logical valve 21, the second logical valve 22, the 3rd logical valve 23 and the 4th logical valve 24) and first solenoid directional control valve 6 form the switch type hydraulicdirectional control valve, the hydraulic oil of hydraulic control proportional flow control valve 5 outputs is by logical valve, by the break-make of four logical valves of the first solenoid directional control valve 6 controls.When the first solenoid directional control valve 6 is in meta (orientation is as the criterion with direction shown in scheming), four logical valve Close Alls, oil hydraulic circuit is closed.When the first solenoid directional control valve 6 is in left position, the second logical valve 22 and 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 the first solenoid directional control valve 6 is in right position, the 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.
The 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 for obtaining the Maximum operating pressure of different actuators oil hydraulic circuit, as the LS feedback pressure signal.
Have two loops switch selector valve prescription case one principle as shown in Figure 2, each switch selector valve group comprises the second one-way valve 11, the 3rd one-way valve 12; Four logical valves (the 5th logical valve 25, the 6th logical valve 26, the 7th logical valve 27 and the 8th logical valve 28), the second solenoid directional control valve 7, the 3rd solenoid directional control valve 71, series flow control valve 8.Its external hydraulic fluid port comprises load feedback hydraulic fluid port LS, oil inlet P, oil return inlet T, drain tap T1, actuator port A3, B3.
Scheme one working principle of switch selector valve group is as follows:
As shown in Figure 3, solid line is transmission fluid force feed circuit among the figure, dotted line is control hydraulic oil circuit, behind the high pressure oil process filter of oil hydraulic pump output, arrive the oil inlet P of switch selector valve group, hydraulic oil flow to the series flow control valve 8 of switch selector valve group, each oil hydraulic circuit uninterrupted is regulated by series flow control valve 8, thereby determines the movement velocity of respective execution mechanisms.
The commutation of oil hydraulic circuit is finished by four logical valves (the 5th logical valve 25, the 6th logical valve 26, the 7th logical valve 27 and the 8th logical valve 28) and two solenoid directional control valves (the second solenoid directional control valve 7, the 3rd solenoid directional control valve 71), when two solenoid directional control valves simultaneously during no electric circuit, oil hydraulic circuit is closed.When 7 energisings of the second solenoid directional control valve, the 3rd solenoid directional control valve 71 no electric circuit, 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, the second solenoid directional control valve 7 no electric circuit, 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.
The first one-way valve 1 links to each other with actuator port A3, the B3 of actuator respectively with the second one-way valve 11 oil-feed ports, is used for obtaining 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 the first hydraulicdirectional control valve 9 in scheme two, can realize equally the commutation function of oil hydraulic circuit.Its concrete principle is:
As shown in Figure 2, solid line is transmission fluid force feed circuit among the figure, dotted line is control hydraulic oil circuit, behind the high pressure oil process filter of oil hydraulic pump output, arrive the first oil inlet P of proportional reversing valve group, hydraulic oil flow to pressure compensator 4 filler openings in each loop of proportional reversing valve group, pressure compensator 4 has been determined 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 determined by input current, thereby is made hydraulic system have good proportional control characteristic.
The commutation of oil hydraulic circuit realizes by the first solenoid directional control valve 6 control the first hydraulicdirectional control valve 9, and when the first solenoid directional control valve 6 is in meta (orientation is as the criterion with direction shown in scheming), the first hydraulicdirectional control valve 9 is in meta, and oil hydraulic circuit is closed.When the first solenoid directional control valve 6 is in when upper, the 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 the first solenoid directional control valve 6 is in when the next, the first hydraulicdirectional control valve 9 is in left position, 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 the second hydraulicdirectional control valve 91 in the switch selector valve prescription case two, can realize equally the commutation function of oil hydraulic circuit.Its concrete principle is:
As shown in Figure 4, solid line is transmission fluid force feed circuit among the figure, dotted line is control hydraulic oil circuit, behind the high pressure oil process filter of oil hydraulic pump output, arrive the oil inlet P of switch selector valve group, hydraulic oil flow to the series flow control valve 8 of switch selector valve group, each oil hydraulic circuit uninterrupted is regulated by series flow control valve 8, thereby determines the movement velocity of respective execution mechanisms.
The commutation of oil hydraulic circuit realizes by the second solenoid directional control valve 7 control the second hydraulicdirectional control valve 91, and when the second solenoid directional control valve 7 is in meta (orientation is as the criterion with direction shown in scheming), the second hydraulicdirectional control valve 91 is in meta, and oil hydraulic circuit is closed.When the second solenoid directional control valve 7 is in when upper, the 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 the second solenoid directional control valve 7 is in when the next, the second hydraulicdirectional control valve 91 is in left position, and the B3 mouth is the filler opening of actuator, and the A3 mouth is the return opening of actuator.
The utility model embodiment also provides a kind of development machine, is provided with above-mentioned hydraulic system on the development machine.Because above-mentioned hydraulic system has above-mentioned technique effect, therefore, the development machine that is provided with this hydraulic system also should possess corresponding technique effect, and the structure of other parts is similar to the above embodiments; Its specific implementation process is similar to the above embodiments, does not hereby give unnecessary details.
Wherein the first actuating mechanism comprises in the development machine: cutterhead lifting, angling cylinder, running motor; The second actuating mechanism comprises: shovel board and back support frame.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (16)

1. a hydraulic system is characterized in that, comprising:
Being used for control needs the proportional reversing valve group of the first actuating mechanism work of speed governing;
Being used for control does not need the switch selector valve group of the second actuating mechanism work of speed governing.
2. described hydraulic system according to claim 1 is characterized in that described proportional reversing valve group comprises:
The first oil-feed oil circuit;
The first pilot pressure oil circuit;
The first oil return circuit;
The first load feedback oil circuit;
The first draining oil circuit;
The first working oil path; And,
The throttle grverning assembly that is communicated with described the first oil-feed oil circuit, described the first pilot pressure oil circuit and described the first draining oil circuit; The throttle grverning assembly carries out throttle grverning control by the first pilot pressure oil circuit to the first oil-feed oil circuit;
The the first commutation assembly that is communicated with described the first oil return circuit, described the first draining oil circuit, described the first working oil path and described throttle grverning assembly; The first commutation assembly is by adjustings that commutate of the oil circuit to throttle grverning assembly output, with the control of realization to the first working oil path.
3. described hydraulic system according to claim 2 is characterized in that described throttle grverning assembly comprises:
Pressure compensator (4), described pressure compensator (4) comprise filler opening, oil outlet, the first compensation oil circuit and and the second compensation oil circuit, the filler opening of described pressure compensator is communicated with described the first oil-feed oil circuit;
Hydraulic control proportional flow control valve (5), described hydraulic control proportional flow control valve (5) comprises filler opening, oil outlet, control port and drain tap, and the first compensation oil circuit of described pressure compensator (4) and the second compensation oil circuit are communicated with respectively filler opening and the oil outlet at described hydraulic control proportional flow control valve (5); The filler opening of described hydraulic control proportional flow control valve (5) is communicated with described pressure compensator oil outlet; The drain tap of described hydraulic control proportional flow control valve (5) is communicated with described the first draining oil circuit;
Be used for regulating the solenoid-operated proportional reduction valve (3) of described hydraulic control proportional flow control valve (5) flow; Described solenoid-operated proportional reduction valve (3) comprises filler opening, oil outlet and Electromagnetic Control end, the filler opening of described solenoid-operated proportional reduction valve (3) is communicated with described the first pilot pressure oil circuit, the oil outlet of described solenoid-operated proportional reduction valve (3) is communicated with the control port of described hydraulic control proportional flow control valve, the Electromagnetic Control end external controller of described solenoid-operated proportional reduction valve (3).
4. described hydraulic system according to claim 3 is characterized in that, described the first commutation assembly comprises:
The the first hydraulic pressure reversing unit that is communicated with described hydraulic control proportional flow control valve (5) oil outlet;
The first solenoid directional control valve (6) that is communicated with described the first hydraulic pressure reversing unit.
5. described hydraulic system according to claim 4 is characterized in that described the first hydraulic pressure reversing unit comprises:
The first logical valve (21), its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve (5) oil outlet, and the second hydraulic fluid port of described the first logical valve (21) is communicated with the second hydraulic fluid port of described the first working oil path;
The second logical valve (22), its first hydraulic fluid port is communicated with described hydraulic control proportional flow control valve (5) oil outlet, and the second hydraulic fluid port of described the second logical valve (22) is communicated with the first hydraulic fluid port of described the first working oil path;
The 3rd logical valve (23), its first hydraulic fluid port is communicated with described the first oil return circuit, and the second hydraulic fluid port of described the 3rd logical valve (23) is communicated with the second hydraulic fluid port of described the first working oil path;
The 4th logical valve (24), its first hydraulic fluid port is communicated with described the first oil return circuit, and the second hydraulic fluid port of described the 4th logical valve (24) is communicated with the first hydraulic fluid port of described the first working oil path; Wherein
Described the first solenoid directional control valve (6) comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described the first solenoid directional control valve (6) is communicated with described hydraulic control proportional flow control valve (5) oil outlet, and the drain tap of described the first solenoid directional control valve (6) is communicated with described the first draining oil circuit; The first oil outlet of described the first solenoid directional control valve (6) is communicated with the control port of described the first logical valve (21) and the control port of described the 4th logical valve (24); The second oil outlet of described the first solenoid directional control valve (6) is communicated with the control port of described the second logical valve (22) and the control port of described the 3rd logical valve (23); Described the first solenoid directional control valve (6) comprises three kinds of working staties:
Under the first working state, the drain tap of described the first solenoid directional control valve (6) is communicated with the control port of described the first logical valve (21), the control port of described the second logical valve (22), the control port of described the 3rd logical valve (23) and the control port of described the 4th logical valve (24) respectively by the first oil outlet and second oil outlet of described the first solenoid directional control valve (6);
Under the second working state, the filler opening of described the first solenoid directional control valve (6) is communicated with the control port of described the first logical valve (21) and the control port of described the 4th logical valve (24) by the first oil outlet of described the first solenoid directional control valve (6); The drain tap of described the first solenoid directional control valve (6) is communicated with the control port of described the second logical valve (22) and the control port of described the 3rd logical valve (23) by the second oil outlet of described the first solenoid directional control valve (6);
Under the third working state, the filler opening of described the first solenoid directional control valve (6) is communicated with the control port of described the second logical valve (22) and the control port of described the 3rd logical valve (23) by the second oil outlet of described the first solenoid directional control valve (6); The drain tap of described the first solenoid directional control valve (6) is communicated with the control port of described the first logical valve (21) and the control port of described the 4th logical valve (24) by the first oil outlet of described the first solenoid directional control valve (6).
6. described hydraulic system according to claim 4 is characterized in that described the first hydraulic pressure reversing unit comprises:
The first hydraulicdirectional control valve (9) comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of described the first hydraulicdirectional control valve (9) is communicated with described hydraulic control proportional flow control valve (5) oil outlet; The return opening of described the first hydraulicdirectional control valve (9) is communicated with described the first oil return circuit; The first oil outlet of described the first hydraulicdirectional control valve (9) and the second oil outlet are communicated with the first hydraulic fluid port and second hydraulic fluid port of described the first working oil path respectively; Described the first hydraulicdirectional control valve (9) comprises three working staties:
Under the first working state, the first oil outlet of described the first hydraulicdirectional control valve (9) and the second oil outlet are communicated with the return opening of described the first hydraulicdirectional control valve (9);
Under the second working state, the first oil outlet of described the first hydraulicdirectional control valve (9) is communicated with the filler opening of described the first hydraulicdirectional control valve (9), and the second oil outlet of described the first hydraulicdirectional control valve (9) is communicated with the return opening of described the first hydraulicdirectional control valve (9);
Under the 3rd working state, the first oil outlet of described the first hydraulicdirectional control valve (9) is communicated with the return opening of described the first hydraulicdirectional control valve (9), and the second oil outlet of described the first hydraulicdirectional control valve (9) is communicated with the filler opening of described the first hydraulicdirectional control valve (9);
Described the first solenoid directional control valve (6) comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described the first solenoid directional control valve (6) is communicated with described the first pilot pressure oil circuit or is communicated with described hydraulic control proportional flow control valve (5) oil outlet, and the drain tap of described the first solenoid directional control valve (6) is communicated with described the first draining oil circuit; The first oil outlet of described the first solenoid directional control valve (6) and the second oil outlet are communicated with the first control port and second control port of described the first hydraulicdirectional control valve (9) respectively; Described the first solenoid directional control valve (6) comprises three kinds of working staties of described the first hydraulicdirectional control valve of control (9) execution different operating state:
Under the first working state, the drain tap of described the first solenoid directional control valve (6) is communicated with the first control port and second control port of described the first hydraulicdirectional control valve (9) respectively by the first oil outlet and second oil outlet of described the first solenoid directional control valve (6);
Under the second working state, the filler opening of described the first solenoid directional control valve (6) is communicated with the second control port of described the first hydraulicdirectional control valve (9) by the first oil outlet of described the first solenoid directional control valve (6); The drain tap of described the first solenoid directional control valve (6) is communicated with the first control port of described the first hydraulicdirectional control valve (9) by the second oil outlet of described the first solenoid directional control valve (6);
Under the third working state, the filler opening of described the first solenoid directional control valve (6) is communicated with the first control port of described the first hydraulicdirectional control valve (9) by the second oil outlet of described the first solenoid directional control valve (6); The drain tap of described the first solenoid directional control valve (6) is communicated with the second control port of described the first hydraulicdirectional control valve (9) by the first oil outlet of described the first solenoid directional control valve (6).
7. described hydraulic system according to claim 6 is characterized in that described the first solenoid directional control valve (6) is three position four-way electromagnetic valve; And/or
Described the first hydraulicdirectional control valve (9) is the 3-position 4-way hydraulic operated valve; And/or
Described the first load feedback oil circuit is provided with the first one-way valve (1), and the filler opening of described the first one-way valve (1) is communicated with the oil outlet of described hydraulic control proportional flow control valve (5).
8. each described hydraulic system is characterized in that according to claim 1-7, and described switch selector valve group comprises:
The second oil-feed oil circuit;
The second oil return circuit;
The second load feedback oil circuit;
The second draining oil circuit;
The second working oil path; And
With the series flow control valve (8) that described the second oil-feed oil circuit is communicated with, described series flow control valve (8) is used for regulating the second oil-feed oil circuit flow, makes the second actuating mechanism operating rate stable;
The the second commutation assembly that is communicated with described the second oil-feed oil circuit, described the second oil return circuit, described the second load feedback oil circuit, described the second draining oil circuit and described the second working oil path, the second commutation assembly is by the adjusting that commutates of the oil circuit to series flow control valve (8) output, with the control of realization to the second working oil path.
9. described hydraulic system according to claim 8 is characterized in that described the second load feedback oil circuit comprises the first reverse feedback oil pipe and the second reverse feedback oil pipe;
Be provided with the second one-way valve (11) on the first feedback oil pipe of described the second load feedback oil circuit, the filler opening of described the second one-way valve is communicated with the first hydraulic fluid port of described the second working oil path;
Be provided with the 3rd one-way valve (12) on the second feedback oil pipe of described the second load feedback oil circuit, the filler opening of described the 3rd one-way valve is communicated with the second hydraulic fluid port of described the second working oil path.
10. described hydraulic system according to claim 9 is characterized in that, described the second commutation assembly comprises:
The the second hydraulic pressure reversing unit that is communicated with described series flow control valve (8);
The solenoid directional control valve group that is communicated with described the second hydraulic pressure reversing unit.
11. described hydraulic system is characterized in that according to claim 10, described solenoid directional control valve group comprises the second solenoid directional control valve (7) and the 3rd solenoid directional control valve (71);
Described the second hydraulic pressure reversing unit comprises:
The 5th logical valve (25), its first hydraulic fluid port is communicated with described series flow control valve (8) oil outlet; The second hydraulic fluid port of described the 5th logical valve (25) is communicated with the second hydraulic fluid port of described the second working oil path;
The 6th logical valve (26), its first hydraulic fluid port is communicated with described series flow control valve (8) oil outlet; The second hydraulic fluid port of described the 6th logical valve (26) is communicated with the first hydraulic fluid port of described the second working oil path;
The 7th logical valve (27), its first hydraulic fluid port is communicated with described the second oil return circuit; The second hydraulic fluid port of described the 7th logical valve (27) is communicated with the second hydraulic fluid port of described the second working oil path;
The 8th logical valve (28), its first hydraulic fluid port is communicated with described the second oil return circuit; The second hydraulic fluid port of described the 8th logical valve (28) is communicated with the first hydraulic fluid port of described the second working oil path; Wherein
Described the second solenoid directional control valve (7) comprises filler opening, drain tap, the first oil outlet and the second oil outlet, the filler opening of described the second solenoid directional control valve (7) is communicated with described the second oil-feed oil circuit, the drain tap of described the second solenoid directional control valve (7) is communicated with described the second draining oil circuit, and the first oil outlet of described the second solenoid directional control valve (7) is communicated with the control port of described the 5th logical valve (25); The second oil outlet of described the second solenoid directional control valve (7) is communicated with the control port of described the 7th logical valve (27); Described the second solenoid directional control valve (7) comprises two kinds of working staties:
Under the first working state, the filler opening of described the second solenoid directional control valve (7) is communicated with the control port of described the 5th logical valve (25) by the first oil outlet of described the second solenoid directional control valve (7); The drain tap of described the second solenoid directional control valve (7) is communicated with the control port of described the 7th logical valve (27) by the second oil outlet of described the second solenoid directional control valve (7);
Under the second working state, the filler opening of described the second solenoid directional control valve (7) is communicated with the control port of described the 7th logical valve (27) by the second oil outlet of described the second solenoid directional control valve (7); The drain tap of described the second solenoid directional control valve (7) is communicated with the control port of described the 5th logical valve (25) by the first oil outlet of described the second solenoid directional control valve (7);
Described the 3rd solenoid directional control valve (71) comprises filler opening, drain tap, the first oil outlet and the second oil outlet, the filler opening of described the 3rd solenoid directional control valve (71) is communicated with described the second oil-feed oil circuit, and the drain tap of described the 3rd solenoid directional control valve (71) is communicated with described the second draining oil circuit; The first oil outlet of described the 3rd solenoid directional control valve (71) is communicated with the control port of described the 6th logical valve (26); The second oil outlet of described the 3rd solenoid directional control valve (71) is communicated with the control port of described the 8th logical valve (28); Described the 3rd solenoid directional control valve (71) comprises described the 3rd solenoid directional control valve (71) first working staties and the second working state with described the second solenoid directional control valve (7) first working staties and the second working state collaborative work, wherein,
Described the 3rd solenoid directional control valve (71) first working staties comprise that the filler opening of described the 3rd solenoid directional control valve (71) is communicated with the control port of described the 6th logical valve (26) by the first oil outlet of described the 3rd solenoid directional control valve (71); The drain tap of described the 3rd solenoid directional control valve (71) is communicated with the control port of described the 8th logical valve (28) by the second oil outlet of described the 3rd solenoid directional control valve (71);
Described the 3rd solenoid directional control valve (71) second working staties comprise that the filler opening of described the 3rd solenoid directional control valve (71) is communicated with the control port of described the 8th logical valve (28) by the second oil outlet of described the 3rd solenoid directional control valve (71); The drain tap of described the 3rd solenoid directional control valve (71) is communicated with the control port of described the 6th logical valve (26) by the first oil outlet of described the 3rd solenoid directional control valve (71).
12. described hydraulic system is characterized in that according to claim 11, described the second solenoid directional control valve (7) is two-position four-way solenoid valve, and/or
Described the 3rd solenoid directional control valve (71) is two-position four-way solenoid valve.
13. described hydraulic system is characterized in that according to claim 10,
Described switch selector valve group also comprises the second pilot pressure oil circuit;
Described solenoid directional control valve group comprises the 4th solenoid directional control valve (61);
Described the second hydraulic pressure reversing unit comprises:
The second hydraulicdirectional control valve (91) comprises filler opening, return opening, the first control port, the second control port, the first oil outlet and the second oil outlet; The filler opening of described the second hydraulicdirectional control valve (91) is communicated with described series flow control valve (8) oil outlet; The return opening of described the second hydraulicdirectional control valve (91) is communicated with described the second oil return circuit; The first oil outlet of described the second hydraulicdirectional control valve (91) and the second oil outlet are communicated with the first hydraulic fluid port and second hydraulic fluid port of described the second working oil path respectively; Described the second hydraulicdirectional control valve (91) comprises three working staties:
Under the first working state, the first oil outlet of described the second hydraulicdirectional control valve (91) and the second oil outlet are communicated with the return opening of described the second hydraulicdirectional control valve (91);
Under the second working state, the first oil outlet of described the second hydraulicdirectional control valve (91) is communicated with the filler opening of described the second hydraulicdirectional control valve (91), and the second oil outlet of described the second hydraulicdirectional control valve (91) is communicated with the return opening of described the second hydraulicdirectional control valve (91);
Under the 3rd working state, the first oil outlet of described the second hydraulicdirectional control valve (91) is communicated with the return opening of described the second hydraulicdirectional control valve (91), and the second oil outlet of described the second hydraulicdirectional control valve (91) is communicated with the filler opening of described the second hydraulicdirectional control valve (91);
Described the 4th solenoid directional control valve (61) comprises filler opening, drain tap, the first oil outlet and the second oil outlet; The filler opening of described the 4th solenoid directional control valve (61) is communicated with described the second pilot pressure oil circuit or is communicated with described series flow control valve (8) oil outlet, and the drain tap of described the 4th solenoid directional control valve (61) is communicated with described the second draining oil circuit; The first oil outlet of described the 4th solenoid directional control valve (61) and the second oil outlet are communicated with the first control port and second control port of described the second hydraulicdirectional control valve (91) respectively; Described the 4th solenoid directional control valve (61) comprises three kinds of working staties of described the second hydraulicdirectional control valve of control (91) execution different operating state:
Under the first working state, the drain tap of described the 4th solenoid directional control valve (61) is communicated with the first control port and second control port of described the second hydraulicdirectional control valve (91) respectively by the first oil outlet and second oil outlet of described the 4th solenoid directional control valve (61);
Under the second working state, the filler opening of described the 4th solenoid directional control valve (61) is communicated with the second control port of described the second hydraulicdirectional control valve (91) by the first oil outlet of described the 4th solenoid directional control valve (61); The drain tap of described the 4th solenoid directional control valve (61) is communicated with the first control port of described the second hydraulicdirectional control valve (91) by the second oil outlet of described the 4th solenoid directional control valve (61);
Under the third working state, the filler opening of described the 4th solenoid directional control valve (61) is communicated with the first control port of described the second hydraulicdirectional control valve (91) by the second oil outlet of described the 4th solenoid directional control valve (61); The drain tap of described the 4th solenoid directional control valve (61) is communicated with the second control port of described the second hydraulicdirectional control valve (91) by the first oil outlet of described the 4th solenoid directional control valve (61).
14. described hydraulic system is characterized in that according to claim 13, described the 4th solenoid directional control valve (61) is three position four-way electromagnetic valve; And/or
Described the second hydraulicdirectional control valve (91) is the 3-position 4-way hydraulic operated valve.
15. a development machine is characterized in that, described development machine is provided with each described hydraulic system of claim 1-14.
16. described development machine is characterized in that according to claim 15, described the first actuating mechanism comprises: cutterhead lifting, angling cylinder, running motor;
Described the second actuating mechanism comprises: shovel board and back support frame.
CN 201220316245 2012-07-02 2012-07-02 Hydraulic system and heading machine Withdrawn - After Issue CN202707654U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102748335A (en) * 2012-07-02 2012-10-24 三一重型装备有限公司 Hydraulic system and heading machine
CN103276765A (en) * 2013-06-03 2013-09-04 江西宜春重工集团有限公司 Spading linkage hydraulic operating system of loader
CN115698520A (en) * 2020-06-04 2023-02-03 Smc 株式会社 Time delay valve and flow controller

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102748335A (en) * 2012-07-02 2012-10-24 三一重型装备有限公司 Hydraulic system and heading machine
WO2014005396A1 (en) * 2012-07-02 2014-01-09 三一重型装备有限公司 Hydraulic system and excavator
CN102748335B (en) * 2012-07-02 2016-04-06 三一重型装备有限公司 A kind of hydraulic system and development machine
CN103276765A (en) * 2013-06-03 2013-09-04 江西宜春重工集团有限公司 Spading linkage hydraulic operating system of loader
CN103276765B (en) * 2013-06-03 2015-07-15 江西宜春重工集团有限公司 Spading linkage hydraulic operating system of loader
CN115698520A (en) * 2020-06-04 2023-02-03 Smc 株式会社 Time delay valve and flow controller
CN115698520B (en) * 2020-06-04 2023-10-10 Smc 株式会社 Delay valve and flow controller
US11852260B2 (en) 2020-06-04 2023-12-26 Smc Corporation Time delay valve and flow rate controller

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