CN102734241B - Opened and closed hydraulic system and engineering machinery - Google Patents

Opened and closed hydraulic system and engineering machinery Download PDF

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Publication number
CN102734241B
CN102734241B CN201210214531.1A CN201210214531A CN102734241B CN 102734241 B CN102734241 B CN 102734241B CN 201210214531 A CN201210214531 A CN 201210214531A CN 102734241 B CN102734241 B CN 102734241B
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China
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valve
oil
fluid port
hydraulic fluid
hydraulic
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CN102734241A (en
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牛从民
王涛
余明
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Sany Heavy Industry Co Ltd
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Sany Heavy Industry Co Ltd
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Abstract

The invention relates to the technical field of machinery, and discloses an opened and closed hydraulic system and engineering machinery. The opened and closed hydraulic system comprises an oil supply pump, a hydraulic actuating element, an oil replenishing pump and an opened oil supply circuit, wherein a first oil port of the hydraulic actuating element is connected with a first oil port of the oil supply pump through a first switch valve; a second oil port of the hydraulic actuating element is connected with a second oil port of the oil supply pump through a second switch valve; an oil inlet of the oil replenishing pump is communicated with an oil tank; an oil outlet of the oil replenishing pump is connected with the second oil port of the oil supply pump through a third switch valve; an oil inlet of the opened oil supply circuit is communicated with the first oil port of the oil supply pump; and the opened oil supply circuit is provided with a fourth switch valve. The hydraulic element is adopted by the opened and closed hydraulic system in an embodiment of the invention so as to integrate functions of an opened hydraulic system and a closed hydraulic system. When the opened and closed hydraulic system is used, a closed work condition and an opened work condition are switched over by controlling states of the switch valves, and accordingly requirements on transportation and operation of the engineering machinery are met. Compared with the prior art, the opened and closed hydraulic system has the advantages that resource utilization rate is increased, and cost is reduced.

Description

Open and close type hydraulic system and engineering machinery
Technical field
The present invention relates to field of mechanical technique, particularly a kind of open and close type hydraulic system and engineering machinery.
Background technique
Hydraulic system can be divided into closed type hydraulic system and open type hydraulic system, closed type hydraulic system is when work, hydraulic oil is the import to motor by hydrovalve from enclosed delivery side of pump, and then the import from the outlet oil return of motor to enclosed pump, thereby form closed circuit, and open type hydraulic system is when work, hydraulic oil is through open type pump, by hydrovalve, arrive motor again, oil sump tank then, thus form open circuit.
In more existing engineering machinery, its traveller generally adopts closed type hydraulic system, work actuator adopts open type hydraulic system, two hydraulic systems are relatively independent, cause like this on complete machine, needing to configure the required hydraulic element of two cover hydraulic systems, especially should use enclosed pump to use again open type pump, resource utilization is lower, and cost is higher.
Summary of the invention
In view of this, the present invention aims to provide a kind of open and close type hydraulic system and engineering machinery, the function that has realized open type hydraulic system and closed type hydraulic system is integrated, and open type operating mode and enclosed operating mode can realize switching by controlling the state of each switch valve, so just, improved resource utilization, and reduced the hydraulic element quantity of using, thereby reduced cost.
On the one hand, the invention provides a kind of described open and close type hydraulic system, this open and close type hydraulic system comprises: oil feed pump; Hydraulic actuator, the first hydraulic fluid port of described hydraulic actuator is connected with the first hydraulic fluid port of described oil feed pump by the first switch valve, and the second hydraulic fluid port of described hydraulic actuator is connected with the second hydraulic fluid port of described oil feed pump by second switch valve; Slippage pump, the filler opening of described slippage pump communicates with fuel tank, and the oil outlet of described slippage pump is connected with the second hydraulic fluid port of described oil feed pump by the 3rd switch valve; Sight oil feed oil circuit, the oiler of described sight oil feed oil circuit communicates with the first hydraulic fluid port of described oil feed pump, and described sight oil feed oil circuit is provided with the 4th switch valve.
Further, described the first switch valve, described second switch valve, described the 4th switch valve are two-position two-way solenoid valve; Described the 3rd switch valve is two-bit triplet solenoid valve, and under the first working state, the oil outlet of described slippage pump leads to fuel tank, and under the second working state, the oil outlet of described slippage pump communicates with the second hydraulic fluid port of described oil feed pump.
Further, described open and close type hydraulic system also comprises oil circuit control and draining path, described the first switch valve comprises the first cartridge valve and the first selector valve, wherein, the first hydraulic fluid port of described the first cartridge valve communicates with the first hydraulic fluid port of described hydraulic actuator, the second hydraulic fluid port of described the first cartridge valve communicates with the first hydraulic fluid port of described oil feed pump, and the control port of described the first cartridge valve optionally communicates with in described oil circuit control and described draining path one by described the first selector valve, described second switch valve comprises the second cartridge valve and the second selector valve, wherein, the first hydraulic fluid port of described the second cartridge valve communicates with the second hydraulic fluid port of described hydraulic actuator, the second hydraulic fluid port of described the second cartridge valve communicates with the second hydraulic fluid port of described oil feed pump, and the control port of described the second cartridge valve optionally communicates with in described oil circuit control and described draining path one by described the second selector valve, described the 3rd switch valve comprises the 3rd cartridge valve, the 4th cartridge valve and the 3rd selector valve, wherein, the first hydraulic fluid port of described the 3rd cartridge valve communicates with the second hydraulic fluid port of described oil feed pump, the second hydraulic fluid port of described the 3rd cartridge valve communicates with the second hydraulic fluid port of described the 4th cartridge valve, the first hydraulic fluid port of described the 4th cartridge valve leads to fuel tank, another second hydraulic fluid port of described the 4th cartridge valve communicates with the oil outlet of described slippage pump, described the 3rd selector valve has two kinds of working staties, under the first working state, described the 3rd control port of cartridge valve and the oil outlet of described slippage pump communicate, the control port of described the 4th cartridge valve communicates with described draining path, under the second working state, the control port of described the 3rd cartridge valve communicates with described draining path, described the 4th control port of cartridge valve and the oil outlet of described slippage pump communicate, described the 4th switch valve comprises the 5th cartridge valve and the 4th selector valve, wherein, the first hydraulic fluid port of described the 5th cartridge valve and the second hydraulic fluid port are serially connected with on described sight oil feed oil circuit, and the control port of described the 5th cartridge valve optionally communicates with in described oil circuit control and described draining path one by the 4th selector valve.
Further, the pressure oil of described oil circuit control comes from oil pressure the grater in the first hydraulic fluid port of described oil feed pump and the second hydraulic fluid port.
Further, described open and close type hydraulic system also comprises shuttle valve, an input end of described shuttle valve communicates with the first hydraulic fluid port of described oil feed pump, and another input end communicates with the second hydraulic fluid port of described oil feed pump, and the output terminal of described shuttle valve communicates with the oiler of described oil circuit control.
Further, the oil circuit that described the 4th cartridge valve leads to fuel tank is provided with cooler.
Further, described the first selector valve, described the second selector valve, described the 3rd selector valve, described the 4th selector valve are two-position four-way solenoid valve.
Further, the oil outlet of described slippage pump is also provided with relief valve.
Further, described hydraulic actuator is oil hydraulic motor.
On the other hand, the present invention also provides a kind of engineering machinery, and this project machinery is provided with the open and close type hydraulic system described in above-mentioned any one.
It is integrated that a kind of open and close type hydraulic system provided by the invention adopts a set of hydraulic element to realize the function of open type hydraulic system and closed type hydraulic system, in use, when needs are operated in enclosed operating mode lower time, can control the first switch valve and second switch valve is opened, and control the 3rd switch valve and the 4th switch valve and disconnect, make to form closed circuit between oil feed pump and hydraulic pressure power unit, when needs are operated in open type operating mode lower time, can control the first switch valve and second switch valve disconnects, and control the 3rd switch valve and the 4th switch valve is opened, make hydraulic oil through slippage pump and oil feed pump, flow to sight oil feed oil circuit from fuel tank, by sight oil feed oil circuit, provide pressure oil for the hydraulic unit that need to work under open type operating mode, when this open and close type hydraulic system applications is during in engineering machinery, can meet walking and the operation needs of engineering machinery simultaneously, compared with prior art, improved resource utilization, also reduced cost.
Engineering machinery provided by the invention is provided with above-mentioned open and close type hydraulic system, and because above-mentioned open and close type hydraulic system has above-mentioned technique effect, so this project machinery also has corresponding technique effect.
Accompanying drawing explanation
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The principle schematic of a kind of open and close type hydraulic system that Fig. 1 provides for the embodiment of the present invention one;
The principle schematic of a kind of open and close type hydraulic system that Fig. 2 provides for the embodiment of the present invention two;
Fig. 3 is each hydraulic fluid port sign picture of the first cartridge valve in Fig. 2, the second cartridge valve, the 3rd cartridge valve, the 4th cartridge valve or the 5th cartridge valve.
Embodiment
It should be pointed out that in this part to be only the explanation to specific embodiment to the description of concrete structure and description order, should not be considered as that protection scope of the present invention is had to any restriction.In addition,, under the situation of not conflicting, embodiment and the feature in embodiment in this part can combine mutually.
Embodiment one
Please refer to Fig. 1, below in conjunction with this accompanying drawing, the present embodiment is elaborated.
As shown in the figure, this embodiment's open and close type hydraulic system mainly comprises the first switch valve 1, second switch valve 2, the 3rd switch valve 3, the 4th switch valve 4, oil feed pump 5, oil hydraulic motor 6, slippage pump 7, fuel tank 8 and relief valve 9 etc. and closed oil circuit 001, closed oil circuit 002, repairing oil circuit 003 and sight oil feed oil circuit 004 etc.
Wherein, the first hydraulic fluid port a1 of oil feed pump 5 is connected with the first hydraulic fluid port b1 of oil hydraulic motor 6 by closed oil circuit 001, and the first switch valve 1 is arranged on closed oil circuit 001; The second hydraulic fluid port a2 of oil feed pump 5 is connected with the second hydraulic fluid port b2 of oil hydraulic motor 6 by closed oil circuit 002, and second switch valve 2 is arranged on closed oil circuit 002; The filler opening c2 of slippage pump 7 leads to fuel tank 8, and oil outlet c1 is connected with the second hydraulic fluid port a2 of oil feed pump 5 by repairing oil circuit 003, and the 3rd switch valve 3 is arranged on repairing oil circuit 003; The oiler of sight oil feed oil circuit 004 communicates with the first hydraulic fluid port a1 of oil feed pump 5, and for provide pressure oil to the hydraulic actuator that need to work (scheming not shown) under open type hydraulic system, the 4th switch valve 4 is arranged on sight oil feed oil circuit 004.
The first switch valve 1, second switch valve 2 and the 4th switch valve 4 are preferably bi-bit bi-pass electro hydraulic valve, wherein, the first switch valve 1 and second switch valve 2 are open in usual, when DT1 dead electricity, the first switch valve 1 is opened, closed oil circuit 001 is in channel status, the first hydraulic fluid port a1 of oil feed pump 5 communicates with the first hydraulic fluid port b1 of oil hydraulic motor 6, when DT1 obtains when electric, the first switch valve 1 disconnects, closed oil circuit 001 is in cut-off state, when DT2 dead electricity, second switch valve 2 is opened, closed oil circuit 002 is in channel status, the second hydraulic fluid port a2 of oil feed pump 5 communicates with the second hydraulic fluid port b2 of oil hydraulic motor 6, when DT2 obtains when electric, second switch valve 2 disconnects, closed oil circuit 002 is in cut-off state, the 4th switch valve 4 is Normally closed type, and when DT4 dead electricity, the 4th switch valve 4 disconnects, and sight oil feed oil circuit 004 is in cut-off state, and when DT4 obtains when electric, sight oil feed oil circuit 004 is in channel status.The 3rd switch valve 3 is preferably two-bit triplet electro hydraulic valve, when DT3 dead electricity, the 3rd switch valve 3 is in the first working state, now, the oil outlet c1 of slippage pump 7 leads to fuel tank 8, and when DT3 obtains when electric, the 3rd switch valve 3 is in the second working state, now, the oil outlet c1 of slippage pump 7 communicates with the second hydraulic fluid port a2 of oil feed pump 5.
Relief valve 9 is connected on the oil outlet c1 and the repairing oil circuit 003 between the 3rd switch valve 3 of slippage pump 7.
In use, when needs are operated in enclosed operating mode lower time, control DT1, DT2, DT3 and DT4 are all in power failure state, now, closed oil circuit 001 and 002 is in channel status, repairing oil circuit 003 and sight oil feed oil circuit 004 are in cut-off state, pressure oil flows to the first hydraulic fluid port b1 (the second hydraulic fluid port b2) of oil hydraulic motor 6 from the first hydraulic fluid port a1 (the second hydraulic fluid port a2) of oil feed pump 5 by closed oil circuit 001 (closed oil circuit 002), from the second hydraulic fluid port b2 (the first hydraulic fluid port b1) of oil hydraulic motor 6, pass through closed oil circuit 002 (closed oil circuit 001) oil return to the second hydraulic fluid port a2 (the first hydraulic fluid port a1) of oil feed pump 5 again, thereby formation closed circuit, if whole closed circuit is during because of reason build-up of pressure shortages of oil such as leakages, can control DT3 obtains electric, make slippage pump 7 for above-mentioned closed circuit, supply pressure oil by repairing oil circuit 003.
When needs are operated in open type operating mode lower time, controlling DT1, DT2, DT3 and DT4 obtains electric, now, closed oil circuit 001 and 002 is in cut-off state, repairing oil circuit 003 and sight oil feed oil circuit 004 are in channel status, slippage pump 7 is pumped to the pressure oil in fuel tank 8 the second hydraulic fluid port a2 of oil feed pump 5 by repairing oil circuit 003, oil feed pump 5 continues pressure oil to be pumped on sight oil feed oil circuit 004 by the first hydraulic fluid port a1, makes sight oil feed oil circuit 004 continually for other need to provide pressure oil by the hydraulic actuator under open type operating mode.In addition, if the oil pressure of the outlet c1 of slippage pump 7 is excessive, will, by relief valve 9 overflows to fuel tank 8, avoid causing because oil pressure is excessive the damage to hydraulic system.
Embodiment two
Please also refer to Fig. 2 and Fig. 3, below in conjunction with accompanying drawing, this embodiment's open and close type hydraulic system is elaborated.
As shown in the figure, this embodiment's open and close type hydraulic system comprises the first switch valve, second switch valve, the 3rd switch valve, the 4th switch valve, oil feed pump 5, oil hydraulic motor 6, slippage pump 7, fuel tank 8, relief valve 9, shuttle valve 10 and cooler 20 etc. and closed oil circuit 001, closed oil circuit 002, repairing oil circuit 003, sight oil feed oil circuit 004, oil circuit control 005 and draining path 006 etc.
Wherein, the first hydraulic fluid port a1 of oil feed pump 5 is connected with the first hydraulic fluid port b1 of oil hydraulic motor 6 by closed oil circuit 001, and the first switch valve is arranged on closed oil circuit 001; The second hydraulic fluid port a2 of oil feed pump 5 is connected with the second hydraulic fluid port b2 of oil hydraulic motor 6 by closed oil circuit 002, and second switch valve is arranged on closed oil circuit 002; The filler opening c2 of slippage pump 7 leads to fuel tank 8, and oil outlet c1 is connected with the second hydraulic fluid port a2 of oil feed pump 5 by repairing oil circuit 003, and the 3rd switch valve is arranged on repairing oil circuit 003; The oiler of sight oil feed oil circuit 004 communicates with the first hydraulic fluid port a1 of oil feed pump 5, and for provide pressure oil to the hydraulic actuator that need to work (scheming not shown) under open type hydraulic system, the 4th switch valve is arranged on sight oil feed oil circuit 004.
Further, the first switch valve specifically comprises that the first cartridge valve e1 and the first selector valve 11, the first selector valves 11 are preferably two-position four-way solenoid valve (DT5), and there is hydraulic fluid port P, T, A and B, when DT5 dead electricity, the first selector valve 11 is operated in the first working state, now, hydraulic fluid port A communicates with P, and B communicates with T, when DT5 obtains when electric, the first selector valve 11 is operated in the second working state, now, hydraulic fluid port A communicates with T, and B communicates with P; The first hydraulic fluid port A1 of the first cartridge valve e1 communicates with the first hydraulic fluid port b1 of oil hydraulic motor 6, the second hydraulic fluid port B1 of the first cartridge valve e1 communicates with the first hydraulic fluid port a1 of oil feed pump 5, the control port X of the first cartridge valve e1 communicates with the hydraulic fluid port B of the first selector valve 11, the hydraulic fluid port A sealing of the first selector valve 11, hydraulic fluid port P and T communicate with oil circuit control 005 and draining path 006 respectively.
Second switch valve specifically comprises that the second cartridge valve e2 and the second selector valve 21, the second selector valves 21 are preferably two-position four-way solenoid valve (DT6), and has hydraulic fluid port P, T, A and B, when DT6 dead electricity, the second selector valve 21 is operated in the first working state, and now, hydraulic fluid port A communicates with P, B communicates with T, when DT6 obtains when electric, the second selector valve 21 is operated in the second working state, now, hydraulic fluid port A communicates with T, and B communicates with P; The first hydraulic fluid port A1 of the second cartridge valve e2 communicates with the second hydraulic fluid port b2 of oil hydraulic motor 6, the second hydraulic fluid port B1 of the second cartridge valve e2 communicates with the second hydraulic fluid port a2 of oil feed pump 5, the control port X of the second cartridge valve e2 communicates with the hydraulic fluid port B of the second selector valve 21, the hydraulic fluid port A sealing of the second selector valve 21, hydraulic fluid port P and T communicate with oil circuit control 005 and draining path 006 respectively.
The 3rd switch valve specifically comprises that the 3rd cartridge valve e3, the 4th cartridge valve e4 and the 3rd selector valve 31, the three selector valves 31 are preferably two-position four-way solenoid valve (DT7), and has hydraulic fluid port P, T, A and B, when DT7 dead electricity, the 3rd selector valve 31 is operated in the first working state, and now, hydraulic fluid port A communicates with P, B communicates with T, when DT7 obtains when electric, the 3rd selector valve 31 is operated in the second working state, now, hydraulic fluid port A communicates with T, and B communicates with P; The first hydraulic fluid port A1 of the 3rd cartridge valve e3 communicates with the second hydraulic fluid port a2 of oil feed pump 5, the second hydraulic fluid port B1 of the 3rd cartridge valve e3 communicates with the second hydraulic fluid port B1 of the 4th cartridge valve e4, the control port X of the 3rd cartridge valve e3 communicates with the hydraulic fluid port A of the 3rd selector valve 31, the first hydraulic fluid port A1 of the 4th cartridge valve e4 leads to fuel tank 8, another second hydraulic fluid port B1 of the 4th cartridge valve e4 communicates with the oil outlet c1 of slippage pump 7, and the control port X of the 4th cartridge valve e4 communicates with the hydraulic fluid port B of the 3rd selector valve 31; The hydraulic fluid port P of the 3rd selector valve 31 and T communicate with repairing oil circuit 003 and draining path 006 respectively.
The 4th switch valve specifically comprises that the 5th cartridge valve e5 and the 4th selector valve 41, the four selector valves 41 are preferably two-position four-way solenoid valve (DT8), and has hydraulic fluid port P, T, A and B, when DT8 dead electricity, the 4th selector valve 41 is operated in the first working state, and now, hydraulic fluid port A communicates with T, B communicates with P, when DT8 obtains when electric, the 4th selector valve 41 is operated in the second working state, now, hydraulic fluid port A communicates with P, and B communicates with T; The first hydraulic fluid port A1 and the second hydraulic fluid port B1 of the 5th cartridge valve e5 are serially connected with on sight oil feed oil circuit 004, the control port X of the 5th cartridge valve e5 communicates with the hydraulic fluid port B of the 4th selector valve 41, the hydraulic fluid port A sealing of the 4th selector valve 41, hydraulic fluid port P and T communicate with oil circuit control 005 and draining path 006 respectively.
Two input ends of shuttle valve 10 communicate with the first hydraulic fluid port a1 and the second hydraulic fluid port a2 of oil feed pump 5 respectively, and the output terminal of shuttle valve 10 communicates with the oiler of oil circuit control 005.The first hydraulic fluid port A1 that cooler 20 is arranged on the 4th cartridge valve e4 leads on the oil circuit of fuel tank 8.Relief valve 9 is connected on the oil outlet c1 and the repairing oil circuit 003 between the 4th cartridge valve e4 of slippage pump 7.
In use, when needs are operated in enclosed operating mode lower time, control DT5, DT6, DT7 and DT8 all in power failure state, now, the control port X of the first cartridge valve e1 leads to draining path 006 by hydraulic fluid port B, the T of the first selector valve 11, the first hydraulic fluid port A1 that hydraulic fluid port B, the T of the control port X of the second cartridge valve e2 by the second selector valve 21 leads to draining path 006, the first cartridge valve e1 and the second cartridge valve e2 communicates with the second hydraulic fluid port B1, and closed oil circuit 001 and 002 is in channel status, and the control port X of the 3rd cartridge valve e3 communicates by hydraulic fluid port A, the P of the 3rd selector valve 31 and the oil outlet c1 of slippage pump 7, the control port X of the 4th cartridge valve e4 communicates with draining path 006 by hydraulic fluid port B, the T of the 3rd selector valve 31, between the first hydraulic fluid port A1 of the 3rd cartridge valve e3 and the second hydraulic fluid port B1, disconnect, between the first hydraulic fluid port A1 of the 4th cartridge valve e4 and the second hydraulic fluid port B1, communicate, pressure oil from slippage pump 7 flows back to fuel tank 8 by the first hydraulic fluid port A1 from the 4th cartridge valve e4, and repairing oil circuit 003 is in cut-off state, in addition, the control port X of the 5th cartridge valve e5 communicates with oil circuit control 005 by hydraulic fluid port B, the P of the 4th selector valve 41, between the first hydraulic fluid port A1 of the 5th cartridge valve e5 and the second hydraulic fluid port B1, disconnects, and immediately boiling oil feeding line 004 is in cut-off state, in this case, pressure oil flows to the first hydraulic fluid port b1 (the second hydraulic fluid port b2) of oil hydraulic motor 6 from the first hydraulic fluid port a1 (the second hydraulic fluid port a2) of oil feed pump 5 by closed oil circuit 001 (closed oil circuit 002), from the second hydraulic fluid port b2 (the first hydraulic fluid port b1) of oil hydraulic motor 6, pass through closed oil circuit 002 (closed oil circuit 001) oil return to the second hydraulic fluid port a2 (the first hydraulic fluid port a1) of oil feed pump 5 again, thereby formation closed circuit, if whole closed circuit is during because of reason build-up of pressure shortages of oil such as leakages, can control DT7 obtains electric, make slippage pump 7 for above-mentioned closed circuit, supply pressure oil by repairing oil circuit 003.
When needs are operated in open type operating mode lower time, controlling DT5, DT6, DT7 and DT8 obtains electric, now, closed oil circuit 001 and 002 is in cut-off state, repairing oil circuit 003 and sight oil feed oil circuit 004 are in channel status, slippage pump 7 is pumped to the pressure oil in fuel tank 8 the second hydraulic fluid port a2 of oil feed pump 5 by repairing oil circuit 003, oil feed pump 5 continues pressure oil to be pumped on sight oil feed oil circuit 004 by the first hydraulic fluid port a1, makes sight oil feed oil circuit 004 continually for other need to provide pressure oil by the hydraulic actuator under open type operating mode.In addition, if the oil pressure of the outlet c1 of slippage pump 7 is excessive, will, by relief valve 9 overflows to fuel tank 8, avoid causing because oil pressure is excessive the damage to hydraulic system.
In the present embodiment, the first selector valve 11, the second selector valve 21 and the 4th selector valve 41 are two-position four-way solenoid valve, and the hydraulic fluid port A of each solenoid valve sealing, in other embodiments, the first selector valve 11, the second selector valve 21 and the 4th selector valve 41 also can adopt two position three-way valve, with the control port X that realizes the corresponding cartridge valve of each selector valve, optionally communicate with in oil circuit control 005 and draining path 006 one.
In the present embodiment, the pressure oil of oil circuit control 005 comes from the first hydraulic fluid port a1 of oil feed pump 5 and the oil pressure the grater in the second hydraulic fluid port a2, and adopt shuttle valve to realize, in other embodiments, the pressure oil obtain manner of oil circuit control 005 or obtain source and can adopt other forms, for example, the pressure oil of oil circuit control 005 also can be supplied by being independent of the oil sources of other outside hydraulic system shown in diagram.
In above-mentioned various embodiment, in order to realize the bidirectional rotation of oil hydraulic motor 6 under enclosed operating mode, oil feed pump 5 adopts two-way variable displacement pump, and slippage pump 7 can adopt one-way pump (as gear pump).
In above-mentioned various embodiment, adopt oil hydraulic motor 6 as the hydraulic actuator of closed type hydraulic system, in other embodiments, also can adopt as required other hydraulic actuator, such as hydraulic jack etc.
In above-mentioned various embodiments' concrete scheme, each switch valve has been done to illustrate, in other embodiments, also can adopt as required other forms, as long as can realize corresponding function of the present invention.
It is integrated that the open and close type hydraulic system that above-mentioned various embodiment provides adopts a set of hydraulic element to realize the function of open type hydraulic system and closed type hydraulic system, in use, can realize by controlling the state of each switch valve the switching of enclosed operating mode and open type operating mode, thereby meet transportation and the operation needs of engineering machinery, compared with prior art, improve resource utilization, also reduced cost.
The embodiment of the present invention also provides a kind of engineering machinery, hoist for example, this project machinery is provided with above-mentioned open and close type hydraulic system, wherein, closed type hydraulic system is used to the traveller of engineering machinery that power is provided, and open type hydraulic system is used to the Working mechanism of engineering machinery that power is provided.Because above-mentioned open and close type hydraulic system has above-mentioned technique effect, therefore, this project machinery also should possess corresponding technique effect, and specific implementation process and the various embodiments described above of its appropriate section are similar, hereby do not repeat.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. an open and close type hydraulic system, is characterized in that, described open and close type hydraulic system comprises:
Oil feed pump (5);
Hydraulic actuator, the first hydraulic fluid port of described hydraulic actuator is connected with first hydraulic fluid port (a1) of described oil feed pump (5) by the first switch valve, and the second hydraulic fluid port of described hydraulic actuator is connected with second hydraulic fluid port (a2) of described oil feed pump (5) by second switch valve;
Slippage pump (7), the filler opening (c2) of described slippage pump (7) communicates with fuel tank (8), and the oil outlet (c1) of described slippage pump (7) is connected with second hydraulic fluid port (a2) of described oil feed pump (5) by the 3rd switch valve;
Sight oil feed oil circuit (004), the oiler of described sight oil feed oil circuit (004) communicates with first hydraulic fluid port (a1) of described oil feed pump (5), and described sight oil feed oil circuit (004) is provided with the 4th switch valve.
2. open and close type hydraulic system as claimed in claim 1, is characterized in that:
Described the first switch valve, described second switch valve, described the 4th switch valve are two-position two-way solenoid valve;
Described the 3rd switch valve is two-bit triplet solenoid valve, and under the first working state, the oil outlet (c1) of described slippage pump (7) leads to fuel tank (8), under the second working state, the oil outlet (c1) of described slippage pump (7) communicates with second hydraulic fluid port (a2) of described oil feed pump (5).
3. open and close type hydraulic system as claimed in claim 1, is characterized in that:
Described open and close type hydraulic system also comprises oil circuit control (005) and draining path (006);
Described the first switch valve comprises the first cartridge valve (e1) and the first selector valve (11), wherein, first hydraulic fluid port (A1) of described the first cartridge valve (e1) communicates with the first hydraulic fluid port of described hydraulic actuator, second hydraulic fluid port (B1) of described the first cartridge valve (e1) communicates with first hydraulic fluid port (a1) of described oil feed pump (5), and the control port (X) of described the first cartridge valve (e1) optionally communicates with in described oil circuit control (005) and described draining path (006) one by described the first selector valve (11);
Described second switch valve comprises the second cartridge valve (e2) and the second selector valve (21), wherein, first hydraulic fluid port (A1) of described the second cartridge valve (e2) communicates with the second hydraulic fluid port of described hydraulic actuator, second hydraulic fluid port (B1) of described the second cartridge valve (e2) communicates with second hydraulic fluid port (a2) of described oil feed pump (5), and the control port (X) of described the second cartridge valve (e2) optionally communicates with in described oil circuit control (005) and described draining path (006) one by described the second selector valve (21);
Described the 3rd switch valve comprises the 3rd cartridge valve (e3), the 4th cartridge valve (e4) and the 3rd selector valve (31), wherein, first hydraulic fluid port (A1) of described the 3rd cartridge valve (e3) communicates with second hydraulic fluid port (a2) of described oil feed pump (5), second hydraulic fluid port (B1) of described the 3rd cartridge valve (e3) communicates with second hydraulic fluid port (B1) of described the 4th cartridge valve (e4), first hydraulic fluid port (A1) of described the 4th cartridge valve (e4) leads to fuel tank (8), another second hydraulic fluid port (B1) of described the 4th cartridge valve (e4) communicates with the oil outlet (c1) of described slippage pump (7), described the 3rd selector valve (31) has two kinds of working staties, under the first working state, the control port (X) of described the 3rd cartridge valve (e3) communicates with the oil outlet (c1) of described slippage pump (7), the control port (X) of described the 4th cartridge valve (e4) communicates with described draining path (006), under the second working state, the control port (X) of described the 3rd cartridge valve (e3) communicates with described draining path (006), the control port (X) of described the 4th cartridge valve (e4) communicates with the oil outlet (c1) of described slippage pump (7),
Described the 4th switch valve comprises the 5th cartridge valve (e5) and the 4th selector valve (41), wherein, it is upper that first hydraulic fluid port (A1) of described the 5th cartridge valve (e5) and the second hydraulic fluid port (B1) are serially connected with described sight oil feed oil circuit (004), and the control port (X) of described the 5th cartridge valve (e5) optionally communicates with in described oil circuit control (005) and described draining path (006) one by the 4th selector valve (41).
4. open and close type hydraulic system as claimed in claim 3, is characterized in that: the pressure oil of described oil circuit control (005) comes from the first hydraulic fluid port (a1) and middle oil pressure the grater of the second hydraulic fluid port (a2) of described oil feed pump (5).
5. open and close type hydraulic system as claimed in claim 4, it is characterized in that: described open and close type hydraulic system also comprises shuttle valve (10), an input end of described shuttle valve (10) communicates with first hydraulic fluid port (a1) of described oil feed pump (5), another input end communicates with second hydraulic fluid port (a2) of described oil feed pump (5), and the output terminal of described shuttle valve (10) communicates with the oiler of described oil circuit control (005).
6. open and close type hydraulic system as claimed in claim 3, is characterized in that: the oil circuit that described the 4th cartridge valve (e4) leads to fuel tank (8) is provided with cooler (20).
7. open and close type hydraulic system as claimed in claim 3, is characterized in that: described the first selector valve (11), described the second selector valve (21), described the 3rd selector valve (31), described the 4th selector valve (41) are two-position four-way solenoid valve.
8. the open and close type hydraulic system as described in claim 1 to 7 any one, is characterized in that: the oil outlet (c1) of described slippage pump (7) is also provided with relief valve (9).
9. the open and close type hydraulic system as described in claim 1 to 7 any one, is characterized in that: described hydraulic actuator is oil hydraulic motor (6).
10. an engineering machinery, is characterized in that: described engineering machinery is provided with the open and close type hydraulic system described in claim 1 to 9 any one.
CN201210214531.1A 2012-06-27 2012-06-27 Opened and closed hydraulic system and engineering machinery Withdrawn - After Issue CN102734241B (en)

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FR3051315B1 (en) * 2016-05-19 2018-06-29 Kuhn S.A. TRAINED AGRICULTURAL MACHINE COMPRISING A SECURE LOAD DEFERRING SYSTEM
CN111237294B (en) * 2020-01-10 2021-10-19 浙江中锐重工科技有限公司 Hydraulic system of walking pile driver
CN112922912A (en) * 2021-02-03 2021-06-08 山东大学 Wave compensation type closed rotary hydraulic control system for marine trestle

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