CN205260475U - Engineering vehicle's hydraulic system and fire engine - Google Patents
Engineering vehicle's hydraulic system and fire engine Download PDFInfo
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- CN205260475U CN205260475U CN201521136856.8U CN201521136856U CN205260475U CN 205260475 U CN205260475 U CN 205260475U CN 201521136856 U CN201521136856 U CN 201521136856U CN 205260475 U CN205260475 U CN 205260475U
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Abstract
The utility model discloses an engineering vehicle's hydraulic system and fire engine, this hydraulic system be including having variable pump (2) of control port (21) and oil -out (22), oil -out (22) through main fuel feeding oil circuit (1) connect in the hydraulic control valve that gets on the bus of engineering machine tool, wherein, hydraulic system still includes auto -change over device, and this auto -change over device connects get on the bus hydraulic control valve feedback hydraulic fluid port (5) with between control port (21) and connect to be in oil -out (22) with between control port (21), in order to pass through auto -change over device's switching makes the feedback hydraulic fluid port (5) and hydraulic pressure in oil -out (22) switch on to control port (21). This engineering vehicle's hydraulic system not only can normally work under low temperature, can also be energy -conserving and reduces the phenomenon that fluid generates heat among the hydraulic system.
Description
Technical field
The utility model relates to hydraulic system field, particularly, relates to a kind of hydraulic system of engineering truckAnd fire fighting truck.
Background technology
Load-sensitive hydraulic system and constant-pressure hydraulic system are widely used in engineering machinery or engineering truckHydraulic system in. Fig. 1 has shown the load-sensitive hydraulic pressure system of a kind of engineering machinery of the prior artSystem, it mainly comprises variable pump 2, get on or off the bus switching valve 8 and get on the bus proportioning valve group 10, wherein variable pumpThe hydraulic oil of 2 supplies arrives the proportioning valve group 10 of getting on the bus, the control of variable pump 2 by way of the switching valve 8 of getting on or off the busHydraulic fluid port 21 directly with feedback hydraulic fluid port 5 hydraulic connectings of the proportioning valve group 10 of getting on the bus, system is awaited orders zero loadTime, variable pump 2 is in the lower work of standby pressure (standby pressure is very low); When system has load, variable pump2 work under the required pressure of load. Fig. 2 has shown the constant voltage of a kind of engineering machinery of the prior artHydraulic system, it mainly comprises variable pump 2, the switching valve 8 of getting on or off the bus, solenoid directional control valve 14 and the ratio of getting on the busExample valve group 10, the hydraulic oil that wherein variable pump 2 is supplied arrives by way of the switching valve 8 of getting on or off the bus the proportioning valve of getting on the busGroup 10, and the FEEDBACK CONTROL hydraulic fluid port 21 of variable pump 2 by solenoid directional control valve 8 optionally with variable pump2 oil-out 22 is communicated with, and system is in the time of zero load awaiting orders, and solenoid directional control valve must not be electric, variable pump 2In the lower work of standby pressure (standby pressure is very low); When system has load, solenoid directional control valve obtains electric, becomesAmount pump 2 is worked under the maximum pressure of default.
Mainly there is following defect in these two kinds of hydraulic systems of the prior art:
1,, for load-sensitive hydraulic system, when system has load, variable pump 2 is in the required pressure of loadUnder power, work, thus can greatly be energy-conservation, do not have unnecessary energy and go to cause fluid heating, stillWhen system is worked in the situation that environment temperature is very low, low temperature can cause oil viscosity to increase rapidly, therebyCause the pressure loss on feedback pipe excessive, it is needed that the output flow of variable pump 2 can be less than loadFlow, thus cause output flow not reach working condition requirement.
2, for constant-pressure hydraulic system, when system has load, solenoid directional control valve obtains electric, and variable pump 2 existsUnder the maximum pressure of default, work, at this moment, due to depositing between maximum pressure and the required pressure of loadIn difference, will cause fluid heating in oil circuit, not only not energy-conservation, and long-time liquid under high temperatureForce feed can make the leakage rate of hydraulic system increase, and in the time that hydraulic fluid temperature further increases, in system, movesLubricated between parts also can variation, and showing of pyrometamorphism also easily appears in wearing and tearing aggravation and hydraulic oilResemble.
Given this, be necessary to provide a kind of hydraulic system of novel engineering truck, to overcome or at least slowSeparate above-mentioned defect.
Utility model content
An object of the present utility model is to provide a kind of hydraulic system of engineering truck, this project vehicleHydraulic system not only can normally be worked at low temperatures, can also be energy-conservation and reduce fluid in hydraulic systemThe phenomenon of heating.
Another object of the present utility model is to provide a kind of fire fighting truck, and this fire fighting truck uses the utility modelThe hydraulic system of the engineering truck providing.
To achieve these goals, the utility model provides a kind of hydraulic system of engineering truck, this hydraulic pressureSystem comprises the variable pump with control port and oil-out, and described oil-out connects by main oil feeding lineIn the hydraulic control valve of getting on the bus of described engineering machinery, wherein, described hydraulic system also comprises switching device shifter,Described in this switching device shifter is connected to, get on the bus between the feedback hydraulic fluid port of hydraulic control valve and described control port withAnd be connected between described oil-out and described control port, to make institute by the switching of described switching device shifterState the extremely described control port of one hydraulic pressure conducting in feedback hydraulic fluid port and described oil-out.
Preferably, the hydraulic system of described engineering truck also comprises the work for detection of described hydraulic systemThe temperature detection control module of the hydraulic fluid temperature in oil circuit, described temperature detection control module signal connectsTo described switching device shifter, with according to described in the hydraulic fluid temperature control in the working oil path of described hydraulic systemThe switching of switching device shifter.
Preferably, described temperature detection control module is arranged to: when detect described hydraulic fluid temperature higher thanWhen the first preset temperature, described in the control of described temperature detection control module switching device shifter switch to make described anti-The conducting of feedback hydraulic fluid port hydraulic pressure is to described control port, so that described hydraulic system becomes load-sensitive hydraulic pressure systemSystem; In the time described hydraulic fluid temperature being detected lower than the second preset temperature, described temperature detection control moduleControl described switching device shifter and switch to and make the conducting of described oil-out hydraulic pressure to described control port, so that described inHydraulic system becomes constant-pressure hydraulic system, and described the first preset temperature is higher than described the second preset temperature.
Preferably, described switching device shifter comprises and being connected between described feedback hydraulic fluid port and described control portThe first switch unit, be connected to the second switch unit between described oil-out and described control port, instituteStating the first switch unit can switch between the first state and the second state, at described the first switch unitThe first state, described feedback hydraulic fluid port is oily to described controls by described the first switch unit hydraulic pressure conductingMouthful, at the second state of described the first switch unit, described the first switch unit stops described feedback hydraulic fluid portHydraulic pressure conducting is to described control port, described the second switch unit can the first state and the second state itBetween switch, at the first state of described the second switch unit, described oil-out switches single by described secondUnit's hydraulic pressure conducting is to described control port, and at the second state of described the second switch unit, described second cutsChanging unit stops the conducting of described oil-out hydraulic pressure to described control port.
Preferably, described the first switch unit is the first solenoid directional control valve, described the first magnetic valve reversal valveHave the first hydraulic fluid port and the second hydraulic fluid port, described the first hydraulic fluid port is connected with described feedback hydraulic fluid port, described the second oilMouthful be connected with described control port, described the first solenoid directional control valve obtains when electric, described the first hydraulic fluid port and secondHydraulic fluid port communicates with each other, and when described the first solenoid directional control valve dead electricity, described the second hydraulic fluid port uniaxially is communicated to instituteState the first hydraulic fluid port, described the second switch unit is the second solenoid directional control valve, described the second magnetic valve reversal valveHave the 3rd hydraulic fluid port, the 4th hydraulic fluid port and the 5th hydraulic fluid port, described the 3rd hydraulic fluid port is connected with described oil-out, instituteState the 4th hydraulic fluid port and be connected with described control port, described the 5th hydraulic fluid port is connected with the first fuel tank, and described secondSolenoid directional control valve obtains when electric, and described the 3rd hydraulic fluid port and the 4th hydraulic fluid port communicate with each other, and described the 4th hydraulic fluid port withThe 5th hydraulic fluid port ends each other, when described the second solenoid directional control valve dead electricity, and described the 3rd hydraulic fluid port and the 4th hydraulic fluid portCut-off, and described the 4th hydraulic fluid port each other and the 5th hydraulic fluid port communicate with each other.
Preferably, described hydraulic system also comprises shuttle valve, and described shuttle valve has shuttle valve the first oil-in, shuttleValve the second oil-in, shuttle valve outlet, described the second hydraulic fluid port is connected with described shuttle valve the first oil-in, described inThe 4th hydraulic fluid port is connected with described shuttle valve the second oil-in, and described shuttle valve outlet is connected with described control port.
Preferably, on described main oil feeding line, be provided with check valve, the import of described check valve is connected to instituteState oil-out, the outlet of described check valve is connected to described switching device shifter.
Preferably, on described main oil feeding line, be provided with the switching valve of getting on or off the bus, can make described main fuel feedingOil circuit selectively fuel feeding to described in get on the bus hydraulic control valve and the hydraulic control valve of getting off.
Preferably, described in get on the bus hydraulic control valve for the proportioning valve group of getting on the bus, described in the hydraulic control valve of getting off beSupporting leg operating valve.
Preferably, described temperature detection control module comprises temperature sensor and controller, described controllerBe connected with described temperature sensor and described switching device shifter signal.
Preferably, described main oil feeding line and described in the get on the bus main oil return circuit of hydraulic control valve be connected to theTwo fuel tanks, described temperature sensor is connected to the inside of described the second fuel tank.
In addition, the utility model also provides a kind of fire fighting truck, and wherein, described fire fighting truck is provided with above-mentioned skillThe hydraulic system of the engineering truck described in art scheme.
By technique scheme, in the hydraulic system of the engineering truck providing at the utility model, canMake the one hydraulic pressure conducting in described feedback hydraulic fluid port and described oil-out by the switching of described switching device shifterTo described control port, (certainly, these words have also comprised such implication: in feedback hydraulic fluid port and oil-outAnother one there is no hydraulic pressure conducting to described control port), so cut described in can controlling as requiredChanging device, for example, under the environment of high temperature, can control described switching device shifter and switch to and make described feedbackExtremely described control port of hydraulic fluid port hydraulic pressure conducting, so that described hydraulic system becomes load-sensitive hydraulic system,Variable pump is worked under the required pressure of load like this, not only can be energy-conservation, also can not produce unnecessary energyAmount goes to cause fluid heating; Under the environment of low temperature, can control described in described switching device shifter switches to and makeThe conducting of oil-out hydraulic pressure, to described control port, so that described hydraulic system becomes constant-pressure hydraulic system, is protectedCard hydraulic pump output is constant and be enough to meet the hydraulic oil of operating mode demand, and then ensures the liquid of this project vehiclePressing system is normally worked at low temperatures.
Other features and advantages of the utility model give the detailed description of the invention part subsequently in detailExplanation.
Brief description of the drawings
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms of descriptionPoint, be used from explanation the utility model with detailed description of the invention one below, but do not form this practicalityNovel restriction. In the accompanying drawings:
Fig. 1 is the schematic diagram of the load-sensitive hydraulic system of a kind of engineering machinery of the prior art.
Fig. 2 is the schematic diagram of the constant-pressure hydraulic system of a kind of engineering machinery of the prior art.
Fig. 3 is according to the schematic diagram of the hydraulic system of the engineering truck of embodiment of the present utility model.
Description of reference numerals
1 main oil feeding line 2 variable pumps
3 first switch unit 4 second switch units
5 feedback hydraulic fluid port 6 first fuel tanks
7 shuttle valves 8 switching valve of getting on or off the bus
The 9 hydraulic control valve 10 proportioning valve groups of getting on the bus of getting off
The main oil return circuit of 11 temperature sensor 12
13 second fuel tank 14 check valves
21 control port 22 oil-outs
31 first hydraulic fluid port 32 second hydraulic fluid ports
41 the 3rd hydraulic fluid port 42 the 4th hydraulic fluid ports
43 the 5th hydraulic fluid ports
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is elaborated. Be to be understood thatBe, detailed description of the invention described herein is only for description and interpretation the utility model, and is not used in limitThe utility model processed.
Referring to Fig. 3, according to an aspect of the present utility model, provide a kind of hydraulic system of engineering truck,This hydraulic system comprises the variable pump 2 with control port 21 and oil-out 22, and oil-out 22 is by mainOil feeding line 1 is connected in the hydraulic control valve of getting on the bus of engineering machinery, and wherein, hydraulic system also comprises switchingDevice, this switching device shifter is connected between the feedback hydraulic fluid port 5 and control port 21 of the hydraulic control valve of getting on the busAnd be connected between oil-out 22 and control port 21, to make feedback oil by the switching of switching device shifterOne hydraulic pressure conducting in mouth 5 and oil-out 22 is to control port 21.
As mentioned above, in the hydraulic system of the engineering truck providing at the utility model, can be by switchingThe switching of device make to feed back one hydraulic pressure conducting in hydraulic fluid port 5 and oil-out 22 to control port 21 (whenSo, these words have also comprised such implication: the another one in feedback hydraulic fluid port 5 and oil-out 22 does not haveHydraulic pressure conducting is to described control port 21), thus can control as required switching device shifter, for example,Under the environment of high temperature, can control switching device shifter and switch to and make to feed back hydraulic fluid port 5 hydraulic pressure conductings to described controlLiquefaction mouth 21, so that hydraulic system becomes load-sensitive hydraulic system, variable pump 2 is required in load like thisPressure under work, not only can be energy-conservation, also can not produce unnecessary energy and go to cause fluid heating; ?Under the environment of low temperature, can control switching device shifter switch to make described oil-out 22 hydraulic pressure conductings to described inControl port 21, so that hydraulic system becomes constant-pressure hydraulic system, guarantee hydraulic pump 2 is exported constant and sufficientTo meet the hydraulic oil of operating mode demand, and then the normal at low temperatures work of the hydraulic system of guarantee this project vehicleDo. Certainly, the utility model is not limited to control according to temperature conditions the switching of switching device shifter, canAccording to other situations (for example, according to the time or according to the residing place of the hydraulic system of this project vehicle)Control the switching of switching device shifter.
Be understandable that, for judging that environment temperature is in high temperature but low temperature, and according to temperatureThe concrete operations mode of controlling the switching of switching device shifter is diversified, for example can be by examining artificiallySurvey the hydraulic fluid temperature in working oil path in hydraulic system, then control artificially the switching of switching device shifter,Certainly, according to preferred embodiment of the present utility model, in order to improve the hydraulic system of this project vehicleAutomaticity, the hydraulic system of this project vehicle can also comprise the working oil for detection of hydraulic systemThe temperature detection control module of the hydraulic fluid temperature in road, temperature detection control module signal is connected to switchingDevice, with according to the switching of the hydraulic fluid temperature control switching device shifter in the working oil path of hydraulic system.
Particularly, temperature detection control module is arranged to: when detecting that hydraulic fluid temperature is default higher than firstWhen temperature, temperature detection control module control switching device shifter switches to and makes to feed back hydraulic fluid port 5 hydraulic pressure conductings to controlLiquefaction mouth 21, so that hydraulic system becomes load-sensitive hydraulic system; When detect hydraulic fluid temperature lower thanWhen the second preset temperature, temperature detection control module control switching device shifter switches to and makes oil-out 22 hydraulic pressureConducting is to control port 21, so that hydraulic system becomes constant-pressure hydraulic system, the first preset temperature is higher thanTwo preset temperatures, wherein, this first preset temperature can be considered as high temperature, and this second preset temperature can be lookedFor low temperature.
According to preferred embodiment of the present utility model, switching device shifter can comprise be connected to feedback hydraulic fluid port 5And the first switch unit 3 between control port 21, be connected between oil-out 22 and control port 21The second switch unit 4, the first switch units 3 can between the first state and the second state, switch,At the first state of the first switch unit 3, feedback hydraulic fluid port 5 by the first switch unit 3 hydraulic pressure conductings extremelyControl port 21, at the second state of the first switch unit 3, the first switch unit 3 stops feedback hydraulic fluid port5 hydraulic pressure conductings to control port 21, the second switch units 4 can be between the first state and the second stateSwitch, at the first state of the second switch unit 4, oil-out 22 is by the second switch unit 4 hydraulic pressureConducting is to control port 21, and at the second state of the second switch unit 4, the second switch unit 4 stopsHydraulic fluid port 22 hydraulic pressure conductings are to control port 21. But the utility model is not limited to this, switching device shifter is oneSwitch unit is also fine.
In addition, the first switch unit 3 can be the first solenoid directional control valve, this first magnetic valve reversal valve toolThere are the first hydraulic fluid port 31 and the second hydraulic fluid port 32, the first hydraulic fluid ports 31 to be connected with feedback hydraulic fluid port 5, the second hydraulic fluid port32 are connected with control port 21, and the first solenoid directional control valve obtains when electric, the first hydraulic fluid port 31 and the second hydraulic fluid port32 communicate with each other, and when the first solenoid directional control valve dead electricity, the second hydraulic fluid port 32 uniaxiallies are communicated to the first hydraulic fluid port31, the second switch units 4 can be the second solenoid directional control valve, and the second magnetic valve reversal valve has the 3rd oilMouth 41, the 4th hydraulic fluid port 42 and the 5th hydraulic fluid port 43, the three hydraulic fluid ports 41 are connected with oil-out 22, the 4th oilMouth 42 is connected with control port 21, and the 5th hydraulic fluid port 43 is connected with the first fuel tank 6, the second electromagnetic switchValve obtains when electric, and the 3rd hydraulic fluid port 41 and the 4th hydraulic fluid port 42 communicate with each other, and the 4th hydraulic fluid port 42 and the 5th oilMouth 43 is cut-off each other, and when the second solenoid directional control valve dead electricity, the 3rd hydraulic fluid port 41 and the 4th hydraulic fluid port 42 are each otherCut-off, and the 4th hydraulic fluid port 42 and the 5th hydraulic fluid port 43 communicate with each other. Certainly the first switch unit 3 and,Two switch units 4 are not limited to the form of solenoid directional control valve, can also be pilot operated directional control valve, break-make evenValve etc., and the concrete structure of the first solenoid directional control valve and the second solenoid directional control valve also can have a variety ofMode of texturing, for example, arrange more working position or more hydraulic fluid port etc., as long as can make to feed back hydraulic fluid port5 and oil-out 22 in the conducting of one hydraulic pressure to control port 21, these modes of texturing all will fallEnter protection domain of the present utility model.
In addition, hydraulic system can also comprise shuttle valve 7, and shuttle valve 7 has shuttle valve the first oil-in, shuttle valveThe second oil-in, shuttle valve outlet, the second hydraulic fluid port 32 is connected with shuttle valve the first oil-in, the 4th hydraulic fluid port 42Be connected with shuttle valve the second oil-in, shuttle valve outlet is connected with control port 21. The setting of shuttle valve, canThe hydraulic oil of avoiding the first switch unit 3 and the second switch unit 4 to export influences each other.
In addition, on main oil feeding line 1, can be provided with check valve 14, the import of check valve 14 is connected toOil-out 22, the outlet of check valve 14 is connected to switching device shifter.
According to preferred embodiment of the present utility model, on main oil feeding line 1, can also be provided with and get on or off the busSwitching valve 8, with can make main oil feeding line 1 selectively fuel feeding to hydraulic control valve and the liquid of getting off of getting on the busPressure control valve 9. This switching valve 8 of getting on or off the bus is preferably the form of magnetic valve. Particularly, the hydraulic pressure control of getting on the busValve processed is the proportioning valve group 10 of getting on the bus, and the hydraulic control valve 9 of getting off is for supporting leg operating valve. But the utility model is notBe limited to this.
Above-mentioned temperature detection control module can comprise temperature sensor 11 and controller, controlsDevice is connected with temperature sensor 11 and switching device shifter signal, particularly, controller can with the first electromagnetismThe automatically controlled end electrical connection of reversal valve and the second solenoid directional control valve.
In addition, the main oil return circuit 12 of main oil feeding line 1 and the hydraulic control valve 10 of getting on the bus can be connected toThe second fuel tank 13, temperature sensor 11 can be connected to the inside of the second fuel tank 13. Certainly, temperature passesSensor 11 is not limited to be connected to the inside of the second fuel tank 13, for example, can also be connected to main oil feeding lineOn 1, as long as can detect in the working oil path of hydraulic system of the engineering truck that the utility model providesHydraulic fluid temperature. Here the second fuel tank 13 of mentioning can be same fuel tank with the first fuel tank 6,Also can be different fuel tanks.
According to another aspect of the present utility model, a kind of fire fighting truck is also provided, wherein, this fire fighting truck is establishedBe equipped with the hydraulic system of the engineering truck described in technique scheme, so this fire fighting truck has possessed above-mentioned workAll advantages of the hydraulic system of journey vehicle. Be understandable that, the engineering machinery such as such as crane also canSo that the hydraulic system of above-mentioned engineering truck to be set, no matter which kind of engineering truck or engineering machinery, as long as arrangeThe hydraulic system of above-mentioned engineering truck, all will fall into protection domain of the present utility model.
Below describe by reference to the accompanying drawings preferred embodiment of the present utility model in detail, still, this practicality is newType is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present utility model,Can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to this realityWith novel protection domain.
It should be noted that in addition each the concrete technology spy described in above-mentioned detailed description of the inventionLevy, in reconcilable situation, can combine by any suitable mode. For fear of needn'tThe repetition of wanting, the utility model is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present utility model, also can be combined, onlyWant it without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (12)
1. a hydraulic system for engineering truck, this hydraulic system comprise there is control port (21) andThe variable pump (2) of oil-out (22), described oil-out (22) connects by main oil feeding line (1)In the hydraulic control valve of getting on the bus of described engineering machinery, it is characterized in that,
Described hydraulic system also comprises switching device shifter, the hydraulic control valve of getting on the bus described in this switching device shifter is connected toFeedback hydraulic fluid port (5) and described control port (21) between and be connected to described oil-out (22)And between described control port (21), to make described feedback hydraulic fluid port (5) by the switching of described switching device shifterWith the extremely described control port (21) of one hydraulic pressure conducting in described oil-out (22).
2. the hydraulic system of engineering truck according to claim 1, is characterized in that, described workThe hydraulic system of journey vehicle also comprises for detection of the hydraulic oil temperature in the working oil path of described hydraulic systemThe temperature detection control module of degree, described temperature detection control module signal is connected to described switching device shifter,With according to the switching of switching device shifter described in the hydraulic fluid temperature control in the working oil path of described hydraulic system.
3. the hydraulic system of engineering truck according to claim 2, is characterized in that, described temperatureDegree detects control module and is arranged to: in the time described hydraulic fluid temperature being detected higher than the first preset temperature, and instituteStating described in the control of temperature detection control module switching device shifter switches to described feedback hydraulic fluid port (5) hydraulic pressure is ledPass to described control port (21), so that described hydraulic system becomes load-sensitive hydraulic system; Work as inspectionWhile measuring described hydraulic fluid temperature lower than the second preset temperature, described in the control of described temperature detection control moduleSwitching device shifter switches to and makes described oil-out (22) hydraulic pressure conducting to described control port (21), so thatDescribed hydraulic system becomes constant-pressure hydraulic system, and described the first preset temperature is higher than the described second default temperatureDegree.
4. according to the hydraulic system of the engineering truck described in any one in claim 1-3, its featureBe, described switching device shifter comprises and is connected to described feedback hydraulic fluid port (5) and described control port (21)Between the first switch unit (3), be connected to described oil-out (22) and described control port (21)Between the second switch unit (4), described the first switch unit (3) can be the first state and secondBetween state, switch, at the first state of described the first switch unit (3), described feedback hydraulic fluid port (5), cut described first to described control port (21) by described the first switch unit (3) hydraulic pressure conductingChange the second state of unit (3), described the first switch unit (3) stops described feedback hydraulic fluid port (5)Hydraulic pressure conducting is to described control port (21), described the second switch unit (4) can be at the first state andBetween the second state, switch, at the first state of described the second switch unit (4), described oil-out (22), cut described second to described control port (21) by described the second switch unit (4) hydraulic pressure conductingChange the second state of unit (4), described the second switch unit (4) stops described oil-out (22) liquidPress conducting to described control port (21).
5. the hydraulic system of engineering truck according to claim 4, is characterized in that, describedOne switch unit (3) is the first solenoid directional control valve, and described the first magnetic valve reversal valve has the first hydraulic fluid port(31) and the second hydraulic fluid port (32), described the first hydraulic fluid port (31) is connected with described feedback hydraulic fluid port (5),Described the second hydraulic fluid port (32) is connected with described control port (21), and described the first solenoid directional control valve obtains electricTime, described the first hydraulic fluid port (31) and the second hydraulic fluid port (32) communicate with each other, described the first solenoid directional control valveWhen dead electricity, described the second hydraulic fluid port (32) uniaxially is communicated to described the first hydraulic fluid port (31), described secondSwitch unit (4) is the second solenoid directional control valve, described the second magnetic valve reversal valve have the 3rd hydraulic fluid port (41),The 4th hydraulic fluid port (42) and the 5th hydraulic fluid port (43), described the 3rd hydraulic fluid port (41) and described oil-out (22)Connect, described the 4th hydraulic fluid port (42) is connected with described control port (21), described the 5th hydraulic fluid port (43)Be connected with the first fuel tank (6), described the second solenoid directional control valve obtains when electric, described the 3rd hydraulic fluid port (41)Communicate with each other with the 4th hydraulic fluid port (42), and described the 4th hydraulic fluid port (42) and the 5th hydraulic fluid port (43) are each otherCut-off, when described the second solenoid directional control valve dead electricity, described the 3rd hydraulic fluid port (41) and the 4th hydraulic fluid port (42)Cut-off, and described the 4th hydraulic fluid port (42) each other communicates with each other with the 5th hydraulic fluid port (43).
6. the hydraulic system of engineering truck according to claim 5, is characterized in that, described liquidPressing system also comprises shuttle valve (7), and described shuttle valve (7) has shuttle valve the first oil-in, shuttle valve second entersThe outlet of hydraulic fluid port, shuttle valve, described the second hydraulic fluid port (32) is connected with described shuttle valve the first oil-in, and described theFour hydraulic fluid ports (42) are connected with described shuttle valve the second oil-in, described shuttle valve outlet and described control port (21)Connect.
7. according to the hydraulic system of the engineering truck described in any one in claims 1 to 3, its spyLevy and be, on described main oil feeding line (1), be provided with check valve (14), described check valve (14)Import is connected to described oil-out (22), and the outlet of described check valve (14) is connected to described switching dressPut.
8. the hydraulic system of engineering truck according to claim 1, is characterized in that, described masterOn oil feeding line (1), be provided with the switching valve of getting on or off the bus (8), can make described main oil feeding line (1)Selectively fuel feeding to described in get on the bus hydraulic control valve and the hydraulic control valve (9) of getting off.
9. the hydraulic system of engineering truck according to claim 8, is characterized in that, described onCar hydraulic control valve is the proportioning valve group (10) of getting on the bus, described in get off hydraulic control valve (9) for supporting leg operationValve.
10. according to the hydraulic system of the engineering truck described in claim 2 or 3, it is characterized in that instituteState temperature detection control module and comprise temperature sensor (11) and controller, described controller and described temperatureDegree sensor (11) is connected with described switching device shifter signal.
The hydraulic system of 11. engineering trucks according to claim 10, is characterized in that, described inMain oil feeding line (1) and described in the get on the bus main oil return circuit (12) of hydraulic control valve (10) be connected toThe second fuel tank (13), described temperature sensor (11) is connected to the inside of described the second fuel tank (13).
12. 1 kinds of fire fighting trucks, is characterized in that, described fire fighting truck is provided with according to claim 1 to 11The hydraulic system of the engineering truck described in middle any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521136856.8U CN205260475U (en) | 2015-12-31 | 2015-12-31 | Engineering vehicle's hydraulic system and fire engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521136856.8U CN205260475U (en) | 2015-12-31 | 2015-12-31 | Engineering vehicle's hydraulic system and fire engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205260475U true CN205260475U (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521136856.8U Expired - Fee Related CN205260475U (en) | 2015-12-31 | 2015-12-31 | Engineering vehicle's hydraulic system and fire engine |
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| Country | Link |
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| CN (1) | CN205260475U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113928981A (en) * | 2021-09-28 | 2022-01-14 | 中联重科股份有限公司 | Engineering vehicle and hydraulic driving system thereof |
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2015
- 2015-12-31 CN CN201521136856.8U patent/CN205260475U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113928981A (en) * | 2021-09-28 | 2022-01-14 | 中联重科股份有限公司 | Engineering vehicle and hydraulic driving system thereof |
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