CN103629175B - Working bucket hydraulic control system and engineering truck - Google Patents
Working bucket hydraulic control system and engineering truck Download PDFInfo
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- CN103629175B CN103629175B CN201310626353.8A CN201310626353A CN103629175B CN 103629175 B CN103629175 B CN 103629175B CN 201310626353 A CN201310626353 A CN 201310626353A CN 103629175 B CN103629175 B CN 103629175B
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Abstract
The invention discloses a kind of working bucket hydraulic control system and engineering truck, control system comprises leveling cyclinder (4) and leveling control loop, amplitude oil cylinder (5) and luffing control loop and pressurizing cylinder (7) and Pressure Increasing Oil-Line (V1), and the rod chamber oil circuit of pressurizing cylinder connects main oil-feed oil circuit (P); In this Pressure Increasing Oil-Line, be provided with the first switching control pilot (11) and have hydraulic connecting to the rod chamber of amplitude oil cylinder first other connect oil circuit (V2) and hydraulic connecting to system fuel tank (15) and be wherein provided with second switch control valve (8) second by connect oil circuit (V3). The present invention is owing to having set up Pressure Increasing Oil-Line, and in jib deadweight removal process, the hydraulic oil in the rodless cavity of amplitude oil cylinder can pass through Pressure Increasing Oil-Line, pressurizing cylinder, main oil-feed oil circuit and leveling control loop to leveling cyclinder fuel feeding, makes working bucket real-time leveling. In this process, without frequent starting emergency pump power unit, working bucket is carried out to leveling, save the energy.
Description
Technical field
The present invention relates to the hydraulic control system in a kind of engineering truck, especially, relate to a kind of for workThe hydraulic control system that work struggles against.
Background technology
In the various engineering vehicles such as hook and ladder, truck, high-altitude operation vehicle, work is all installedStruggle against, with the platform of standing as article carrying platform or operating personnel. As shown in Figure 1, engineering truckOn turntable 3, be hinged with jib 2, jib 2 carries out pivot with respect to turntable 3 under the promotion of amplitude oil cylinder 5Change width motion, drive the working bucket 1 on the top that is hinged on jib 2 hoist or decline. In working bucket 1Hoist or decline process in, by leveling cyclinder 4, working bucket 1 is carried out to leveling, make it to remainAt horizontal level, in order to avoid the people who loads in working bucket or object are caused to adverse effect.
But, after jib 2 luffings launch, if the Main Hydraulic Pump of Full Vehicle System or driving Main Hydraulic PumpPower set break down and akinesia, need jib 2 promptly to regain. At some engineering trucksUpper, direct current emergency pump is installed for this reason, has been exchanged emergency pump or put-put etc. as powerEmergency pump device, to jib 2 is regained smoothly, and emergency pump device provides moving for leveling cyclinder 4Power is with real-time leveling working bucket 1. Further, in order to save energy, avoid long-time use simultaneouslyEmergency pump device and the situation of the energy shortage that causes occurs, utilize jib 2 more conveniently self is heavyPower action principle, under the Gravitative Loads of jib 2, the hydraulic oil in the rodless cavity of compressing amplitude oil cylinder 5,Make it evenly to discharge oil return case, thereby reach the object of jib 2 the automatic recoveries, be i.e. so-called " jibDeadweight is reclaimed ". Now, in the gravity decentralization process of jib 2, working bucket 1 is difficult to keep in real time waterFlat. If while being mounted with people or thing in working bucket, when realizing jib gravity and automatically transfer, need veryStart frequently emergency pump power unit with leveling working bucket 1, both had a strong impact on operating efficiency, again wasteThe energy of power unit.
Summary of the invention
The object of this invention is to provide a kind of working bucket hydraulic control system, and there is this working bucket hydraulic pressureThe engineering truck of control system, can be to working bucket automatic leveling and nothing in the gravity decentralization process of jibNeed to start emergency pump power unit.
For achieving the above object, the invention provides a kind of working bucket hydraulic control system, described system bagDraw together: for described working bucket being carried out to leveling cyclinder and leveling control loop, amplitude oil cylinder and the change of levelingWidth control loop and be respectively each loop and provide main oil-feed oil circuit and the main oil return circuit of oil-feed and oil return,Thereby described amplitude oil cylinder is for controlling the luffing of jib and driving the described working bucket being connected with this jibLifting; And
Pressurizing cylinder and be connected to the rodless cavity of this pressurizing cylinder and the rodless cavity of described amplitude oil cylinder betweenPressure Increasing Oil-Line, in this Pressure Increasing Oil-Line, be provided with the first switching control pilot, the rod chamber oil of described pressurizing cylinderRoad connects described main oil-feed oil circuit with to described leveling control loop fuel feeding;
Wherein, described Pressure Increasing Oil-Line has first other connect of hydraulic connecting to the rod chamber of described amplitude oil cylinderOil circuit and hydraulic connecting be to the second other oil circuit that connects of system fuel tank, and this second other connecing is provided with second in oil circuit and opensClose control valve.
Preferably, in described luffing control loop, be provided with amplitude oil cylinder balanced valve group, the described first other oil that connectsRoad is connected to being connected on oil circuit between described amplitude oil cylinder balanced valve group and the rod chamber of amplitude oil cylinder, andAnd the described first other connecing in oil circuit is provided with the first check valve, to make hydraulic oil can pass through described the first sideConnect oil circuit and flow to the rod chamber of described amplitude oil cylinder and oppositely cut-off.
Preferably, be also provided with luffing main operation valve in described luffing control loop, this luffing main operation valve dividesDo not connect oil circuit by rod chamber and be connected the corresponding bar that has that is connected to described amplitude oil cylinder of oil circuit with rodless cavityOn chamber and rodless cavity, described amplitude oil cylinder balanced valve group comprise the first external control type balanced valve that structure is identical andThe second external control type balanced valve, described the first external control type balanced valve is arranged on described rod chamber and connects in oil circuit alsoAnd pilot control oil circuit connects described rodless cavity and connects oil circuit, and described the second external control type balanced valve is arranged on instituteState rodless cavity and connect in oil circuit and pilot control oil circuit connects described rod chamber and connects oil circuit, wherein, instituteState first other connect oil circuit be connected to described the first external control type balanced valve and described amplitude oil cylinder rod chamber itBetween rod chamber connect in oil circuit part.
Preferably, this system also comprises the second check valve, and the rod chamber oil circuit of described pressurizing cylinder is connected toOn tie point in described main oil-feed oil circuit, described the second check valve is arranged on the institute of described tie point one sideState in main oil-feed oil circuit part, with make hydraulic oil in described pressurizing cylinder by described tie point anotherThe described main oil-feed oil circuit part of side and flow to described leveling control loop.
Preferably, this system also comprises the first overflow valve, and this first overflow valve is arranged on described Pressure Increasing Oil-LineAnd being connected on oil circuit between described system fuel tank.
Preferably, described the first switching control pilot and the interlock of described second switch control valve are controlled, to makeWhen connecing the one conducting in oil circuit, described Pressure Increasing Oil-Line and the second side block another one.
Preferably, in described Pressure Increasing Oil-Line, be provided with choke valve.
Preferably, this system also comprises control module and is arranged on the obliquity sensor in described working bucket,In described leveling control loop, be provided with leveling control valve group, this leveling control valve group comprises electric proportional controlValve, described control module for according to electric proportional control valve described in the signal controlling of described obliquity sensor withAdjusting flows to the hydraulic fluid flow rate of described leveling cyclinder.
Preferably, in described leveling control valve group, also comprise the confession for limiting described leveling control loopThe second overflow valve of oil oil pressure.
In addition, the present invention also provides a kind of engineering truck, and this project vehicle comprises above-mentioned according to the present inventionWorking bucket hydraulic control system.
According to technique scheme, in working bucket hydraulic control system of the present invention owing to having set up pressurised oilCylinder and first, second switching control pilot, thereby in the process reclaiming in jib deadweight, the nothing of amplitude oil cylinderBar chamber by compression, thereby a part that makes the pressure oil in its rodless cavity otherly connects oil circuit and flows back into by firstThe rod chamber of amplitude oil cylinder, another part is by flowing to the rodless cavity of pressurizing cylinder, and what make pressurizing cylinder hasThe fluid supercharging in bar chamber, the pressure oil after supercharging by main oil-feed oil circuit and leveling control loop to leveling oilOil supply cylinder, thus the hydraulic oil of having realized between multiple oil cylinders recycles, can automatic leveling working bucket.
Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, withDetailed description of the invention one is below used from explanation the present invention, but is not construed as limiting the invention. ?In accompanying drawing:
Fig. 1 is working bucket common in engineering truck and the mounting structure schematic diagram of drive unit thereof;
Fig. 2 is according to the hydraulic principle of the working bucket hydraulic control system of the preferred embodiment of the present inventionFigure, pressurizing cylinder is wherein in off working state;
Fig. 3 is the working bucket hydraulic control system shown in Fig. 2, the pressurizing cylinder that different is wherein inDuty.
Description of reference numerals
1 working bucket 2 jibs
3 turntable 4 leveling cyclinders
5 amplitude oil cylinder
7 pressurizing cylinder 8 second switch control valves
9 first overflow valve 10 choke valves
11 first switching control pilot 12 first check valves
13 amplitude oil cylinder balanced valve group 14 luffing main operation valves
15 system fuel tank 16 counterbalance valves
17 second check valve 18 leveling control valve groups
19 leveling cyclinder balanced valve group 181 electric proportional control valves
182 first functional module 183 second functional modules
The other oil circuit that connects of V1 Pressure Increasing Oil-Line V2 first
The other oil circuit A tie point that connects of V3 second
The main oil return circuit of the main oil-feed oil circuit of P T
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated. Should be understood that,Detailed description of the invention described herein only, for description and interpretation the present invention, is not limited to thisBright.
In the present invention, in the situation that not doing contrary explanation, the noun of locality of use as " upper and lower, left,Right " typically refer to reference to upper and lower, left and right shown in the drawings; " inside and outside " refers to respect to each portionThe profile of part itself inside and outside. The technical terms " jib deadweight is reclaimed " using in the present invention refers toBe that jib quits work after system Main Hydraulic Pump quits work, utilize the self gravitation of jib, make itTowards turntable luffing reclaim, and then compressing amplitude oil cylinder rodless cavity in hydraulic oil, make it even releaseOil return case, thus reach the object that jib deadweight is reclaimed.
Shown in Fig. 1 and Fig. 2, the invention provides a kind of working bucket hydraulic control system, working bucket1 is articulated with on the top of jib 2, and the bottom of this jib 2 is articulated with on turntable 3, wherein, and this workBucket hydraulic control system comprises: return with leveling control for the leveling cyclinder 4 that working bucket 1 is carried out to levelingThe amplitude oil cylinder 5 of road, jib 2 is with luffing control loop and be respectively each loop oil-feed and oil return are providedMain oil-feed oil circuit P and main oil return circuit T; And pressurizing cylinder 7 be connected to this pressurizing cylinder 7Pressure Increasing Oil-Line V1 between the rodless cavity of rodless cavity and amplitude oil cylinder 5, is provided with in this Pressure Increasing Oil-Line V1In one switching control pilot 11(figure, be the solenoid directional control valve of 2/2-way), the rod chamber oil of pressurizing cylinder 7Road connects main oil-feed oil circuit P with to leveling control loop fuel feeding; Wherein, Pressure Increasing Oil-Line V1 has hydraulic pressureBe connected to first other oil circuit V2 and the hydraulic connecting of connecing of rod chamber of amplitude oil cylinder 5 to system fuel tank 15The second other oil circuit V3 that connects, this second other connect to be provided with in second switch control valve 8(figure in oil circuit V3 beThe solenoid directional control valve of two-bit triplet). As total inventive concept, by the rodless cavity at pressurizing cylinder 7And between the rodless cavity of amplitude oil cylinder 5, set up Pressure Increasing Oil-Line V1, make in jib deadweight removal process,Hydraulic oil in the rodless cavity of amplitude oil cylinder 5 can flow to by Pressure Increasing Oil-Line V1 the nothing of pressurizing cylinder 7Bar chamber, thus the oil liquid pressure in the rod chamber of promotion pressurizing cylinder 7 rises and exports to main oil-feed oil circuitP, so by leveling control loop to leveling cyclinder 4 fuel feeding, make working bucket 1 obtain real-time leveling.Recycle with regard to the hydraulic oil of having realized between multiple oil cylinders like this, can automatic leveling working bucket, andWithout frequent starting emergency pump power unit, working bucket is carried out to leveling, save power source and avoid correspondingComplex control.
Wherein, amplitude oil cylinder 5 is generally arranged on turntable 3 and arm as illustrated in fig. 1 as main amplitude oil cylinderBetween frame 2, but in the time that jib 2 is arm support component form, for example jib 2 comprises an arm and No. two arms,No. one arm comprises multi-stage telescopic arms, when No. two arms are articulated with on the epimerite telescopic arm of an arm, and amplitude oil cylinder5 also can be arranged between No. two arms and the epimerite telescopic arm of an arm, as long as can meet jib auto backTime receiving, the equal pressurized retraction of piston rod of amplitude oil cylinder 5. Those skilled in the art can understand,Typically the plunger shaft volume of amplitude oil cylinder 5 is much larger than leveling cyclinder 4, and reclaims in jib deadweightIn process, the stroke of amplitude oil cylinder 5 is also greater than the stroke of leveling cyclinder 4, make amplitude oil cylinder 5 without barThe fluid flow flowing out in chamber far exceeds the needs flow that meets leveling cyclinder 4. Consider luffing oil simultaneouslyThe rod chamber of cylinder 5 needs to supplement fluid simultaneously, to prevent inhaling sky, unfavorable to the use of Hydraulic Elements. CauseThe part fluid flowing out in the rodless cavity of this amplitude oil cylinder 5 also can meet oil circuit V2 by the first side and add toIn rod chamber, and the hydraulic oil of the difference in volume size in two chambeies of amplitude oil cylinder 5 should guarantee to meet levelingThe needs of oil cylinder 4. The second other oil circuit V3 that connects for discharging Pressure Increasing Oil-Line V1 in the time that jib 2 is normally workedIn hydraulic oil, make piston rod in pressurizing cylinder 7 under the pressure oil effect of main oil-feed oil circuit P toMove left to cylinder bottom, while work for pressurizing cylinder 7, reserve enough piston strokes.
As shown in Figure 2, in luffing control loop, be provided with amplitude oil cylinder balanced valve group 13 and luffing main operationValve 14, this luffing main operation valve 14 comprises functional module and main reversing valve etc., two works of main reversing valveMaking hydraulic fluid port connects oil circuit by rod chamber respectively and is connected the corresponding amplitude oil cylinder 5 that is connected to of oil circuit with rodless cavityOn rod chamber and rodless cavity, stretching out or bouncing back with switching controls amplitude oil cylinder 5. Amplitude oil cylinder balanced valveGroup 13 is controlled for oil-feed and the oil return in the bar chamber to amplitude oil cylinder 5, and lockup piston bar in caseOnly piston rod rapid decompression declines and causes damage. Be provided with on the basis of amplitude oil cylinder balanced valve group 13,Described first other connect oil circuit V2 be connected to amplitude oil cylinder balanced valve group 13 and amplitude oil cylinder 5 rod chamber itBetween connection oil circuit (be rod chamber connect oil circuit) upper, i.e. K2 point in Fig. 2 or Fig. 3. Particularly,Amplitude oil cylinder balanced valve group 13 comprises the first external control type balanced valve and the second external control type balance that structure is identicalValve, the first external control type balanced valve is arranged in rod chamber connection oil circuit and pilot control oil circuit connects without barChamber connects oil circuit, and the second external control type balanced valve is arranged on rodless cavity and connects in oil circuit and pilot control oil circuitConnect rod chamber and connect oil circuit. Like this, first other meet oil circuit V2 to be preferably connected to the first external control type flatRod chamber between weighing apparatus valve and the rod chamber of amplitude oil cylinder 5 is connected in oil circuit part. Due to each external control typeBalanced valve comprises sequence valve in parallel and check valve, thereby anti-due to the check valve in external control type balanced valveTo cut-off effect, the first other hydraulic oil connecing in oil circuit V2 can not flow to system fuel tank 15, and can only flowTo rod chamber. Further, the first other connecing is also provided with the first check valve 12 in oil circuit V2, and this is first singleReverse port to valve 12 connects rod chamber, to make hydraulic oil to meet oil circuit V2 by the first sideFlow to the rod chamber of amplitude oil cylinder 5 and oppositely cut-off.
In addition, although exporting, the oil pump that main oil-feed oil circuit P connects generally can be provided for preventing to hydraulic pumpThe check valve backflowing etc., but more preferably, be the pressure oil energy of guaranteeing that the rod chamber of pressurizing cylinder 7 flows outEnough all flow to leveling control loop, as shown in Figure 2, the pressurizing cylinder 7 in present embodiment have a barChamber oil circuit is connected on the tie point A in main oil-feed oil circuit P, separately has the second check valve 17 companies of being arranged onIn the main oil-feed oil circuit P part of contact A mono-side, the reverse port hydraulic connecting of the second check valve 17 increasesThe rod chamber of compressing cylinder 7, to make the hydraulic oil in rod chamber pass through the main oil-feed of tie point A opposite sideOil circuit P partly flows to leveling control loop. Certainly, the second check valve 17 can also be for example electromagnetismSwitch valves etc., can realize above-mentioned effect equally.
In addition, larger at the stroke of amplitude oil cylinder 5, cause discharging the hydraulic oil mistake in Pressure Increasing Oil-Line V1Amount, when pressure is excessive, also needs to carry out pressure release. For this reason, in hydraulic control system of the present invention also preferablyComprise the first overflow valve 9, this first overflow valve 9 is as the safety overflow valve of Pressure Increasing Oil-Line V1, as Fig. 2Shown in be arranged on being connected on oil circuit between Pressure Increasing Oil-Line V1 and system fuel tank 15. In addition, pressurised oilIn the V1 of road, be also provided preferably with choke valve 10, by regulating the valve port opening size of this choke valve 10,Making jib 2 uniform and stable declines. Between system fuel tank 15 and main oil return circuit T, be provided with counterbalance valve16 so that keep certain back pressure in the oil return circuit T of winner, in engineering truck, and the portion side of getting on the bus of vehicleMain oil return circuit T in hydraulic oil be unlikely to flow back to because of self gravitation the portion side of getting off completely beIn system fuel tank 15.
In leveling control loop, be generally provided with leveling control valve group 18 and leveling cyclinder as shown in Figure 2Balanced valve group 19, the structure of leveling cyclinder balanced valve group 19 and act on roughly the same amplitude oil cylinder balanced valve group 13,Repeat no more. Working bucket hydraulic control system in present embodiment also comprises control module and is arranged on workMake the obliquity sensor (not shown) in bucket 1, leveling control valve group 18 comprises electric proportional control valve 181,Control module is for flowing to leveling according to the signal controlling electric proportional control valve 181 of obliquity sensor to regulateThe hydraulic fluid flow rate of oil cylinder 4. In the present embodiment, as shown in Figure 2, in leveling control valve group 18General also have and the of the second functional module 183 of electric proportional control valve 181 cooperatings and otherOne functional modules 182 etc., therefore control module can be controlled electric proportional control valve 181 and in conjunction with the second functionModule 183 co-controllings flow to the hydraulic fluid flow rate of leveling cyclinder 4. Control module wherein can be onlyVertical controller, also can comprise control circuit or control program etc. In addition, in leveling control valve group 11The second overflow valve that also preferably includes the fuel feeding oil pressure for limiting leveling control loop is (not aobvious in figureShow), in first functional module 182 of this second overflow valve operated by rotary motion before electric proportional control valve 181.The second overflow valve pressure release that can be from the first functional module 182 in the time that the fuel feeding oil pressure of pressurizing cylinder 7 is excessiveOverflow. It should be noted that, the leveling control valve group 18 in the present embodiment shown in Fig. 2 is commonLeveling control valve group, is arranged on the first functional module 182 and second merit of electric proportional control valve 181 front and backThe structure of energy module 183 consists of conventionally known to one of skill in the art, does not belong to main points of the present invention, because ofAnd no longer launch carefully to state at this.
Above-mentioned working bucket hydraulic control system may be used on hook and ladder, truck, work high above the groundCars etc. have in the various engineering truck of working bucket, can keep the real-time level of working bucket, and save energy consumption,Avoid frequent starting emergency pump power unit. Set forth working bucket hydraulic control system below in conjunction with Fig. 2 and Fig. 3The course of work of system.
In the time of jib 2 normal work, as shown in Figure 2, the first switching control pilot 11 turn-offs and makes to increaseForce feed road V1 disconnects, and second switch control valve 8 is opened and conducting second is other connects oil circuit V3, now superchargingOil circuit is not worked, and leveling cyclinder 4 and amplitude oil cylinder 5 are worked by system Main Hydraulic Pump driven, simultaneouslyHydraulic oil in the rodless cavity of pressurizing cylinder 7 meets oil circuit V3 by the second side and is all back to system fuel tank15, the piston of pressurizing cylinder 7 moves to left to cylinder bottom.
In the time that needs jib deadweight is reclaimed, the power source of Main Hydraulic Pump and hydraulic emergency pump power source all inThe state that shuts down, as shown in Figure 3, now makes the first switching control pilot 11 open and conducting superchargingOil circuit V1, second switch control valve 8 turn-offs and the second other oil circuit V3 that connects is disconnected. Now, due toThe Action of Gravity Field of jib 2 self, there is certain pressure in the hydraulic oil in the rodless cavity of amplitude oil cylinder 5, inThat hydraulic oil in this rodless cavity flows to Pressure Increasing Oil-Line V1, oil cylinder retraction, jib 2 reaches deadweight and reclaimsObject. Wherein, the existence of choke valve 10 can prevent that jib 3 from reclaiming excessive velocities, makes jib 2 equalEven decline stably. In the retraction process of amplitude oil cylinder 5, in rod chamber, need to supplement in time hydraulic oil,Otherwise can inhale sky, unfavorable to the use of Hydraulic Elements, and in amplitude oil cylinder decline process, working bucket1 can not automatic leveling. Along with the decline of jib 2, working bucket 1 produces. Thereby, in the present inventionIn, the hydraulic oil in the rodless cavity of amplitude oil cylinder 5 flow through the first switching control pilot 11, choke valve 10,Then a part of hydraulic oil otherly meets oil circuit V2 and adds to luffing oil through being provided with first of the first check valve 12In the rod chamber of cylinder 5, another part hydraulic oil flows to the rodless cavity of pressurizing cylinder 7. Hydraulic oil promotes to increaseThe piston rod of compressing cylinder 7 outwards moves, and due to the existence of piston rod, between rod chamber and rodless cavity, existsDifference in volume, makes the stretching out in process of piston rod, and the oil liquid pressure in rod chamber constantly rises, and has barThe hydraulic oil in chamber outwards flows out to main oil-feed oil circuit P, because be provided with second unidirectional in main oil-feed oil circuit PValve 17, so the pressure oil that the rod chamber of pressurizing cylinder 7 flows out is forced to flow to leveling control valve group 18.Leveling control valve group 18 is controlled to the leveling cyclinder 4 of working bucket 1 and is supplied with suitable hydraulic oil, makes workBucket 1 keeps level.
If the output pressure of the rod chamber of pressurizing cylinder 7 is P1, P1 should be greater than leveling cyclinder 4Large operating pressure, is less than again in the first functional module 182 in leveling control valve group built-in second simultaneouslyThe oil pressure relief of overflow valve, had so both ensured that leveling cyclinder 4 can move smoothly under any state, againHydraulic oil in the rod chamber of guarantee pressurizing cylinder 7 does not produce overflow.
In addition, in design, should ensure the in large supply in leveling of hydraulic oil in the rod chamber of pressurizing cylinder 7The hydraulic oil demand of oil cylinder 4, ensures in the situation that hydraulic oil has a small amount of leakage, also can fuel feeding abundant.In addition, the second switch control valve 8 shown in Fig. 2 and Fig. 3 is open type, also can be designed to closed type.
In the present invention, can ensure in jib deadweight removal process, working bucket 1 can automatic leveling, beginsKeep eventually level. Compared with prior art, saved the energy of emergency power unit. In working bucket1 is loaded with in the situation of people or thing, can greatly improve the security of jib 2 decline processes, also greatlyShorten the recovery time of jib 2, meanwhile, avoided emergency power unit frequent starting to cause machineAdverse effect. Wherein, due to the use of the second switch control valve 8 in Fig. 2, both ensured in deadweightWhen recovery, the rod chamber of pressurizing cylinder 7 is set up pressure smoothly. Ensure again to adopt in hydraulic system simultaneouslyMain oil pump drives under the normal operating conditions of jib knee-action, and the piston rod of pressurizing cylinder 7 can return smoothlyReceive the end, make the rod chamber of pressurizing cylinder 7 be full of hydraulic oil, transfer and get ready for gravity.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail, still, the present invention does not limitDetail in above-mentioned embodiment, within the scope of technical conceive of the present invention, can be to the present inventionTechnical scheme carry out multiple simple variant, these simple variant all belong to protection scope of the present invention.
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 present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as itsWithout prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (9)
1. a working bucket hydraulic control system, wherein, described system comprises:
For described working bucket (1) being carried out to the leveling cyclinder (4) and leveling control loop, change of levelingWidth oil cylinder (5) and luffing control loop and be respectively each loop the main oil-feed oil of oil-feed and oil return is providedRoad (P) and main oil return circuit (T), described amplitude oil cylinder (5) is for controlling the luffing of jib (2)Thereby and drive described working bucket (1) lifting that is connected with this jib (2); And
Pressurizing cylinder (7) and the rodless cavity and the described amplitude oil cylinder (5) that are connected to this pressurizing cylinder (7)Rodless cavity between Pressure Increasing Oil-Line (V1), in this Pressure Increasing Oil-Line (V1), be provided with the first switching control pilot(11), the rod chamber oil circuit of described pressurizing cylinder (7) connects described main oil-feed oil circuit (P) with to instituteState leveling control loop fuel feeding;
Wherein, described Pressure Increasing Oil-Line (V1) has the have bar of hydraulic connecting to described amplitude oil cylinder (5)First side in chamber connects oil circuit (V2) and hydraulic connecting connects oil circuit (V3) to the second side of system fuel tank (15),This second other connecing is provided with second switch control valve (8) in oil circuit (V3); Described the first switching control pilot (11)Control with described second switch control valve (8) interlock, to make described Pressure Increasing Oil-Line (V1) and secondWhen connecing the one conducting in oil circuit (V3), side blocks another one.
2. working bucket hydraulic control system according to claim 1, wherein, described luffing controlIn loop, be provided with amplitude oil cylinder balanced valve group (13), described the first other connecing described in oil circuit (V2) is connected toBeing connected on oil circuit between the rod chamber of amplitude oil cylinder balanced valve group (13) and amplitude oil cylinder (5), andAnd the described first other connecing in oil circuit (V2) is provided with the first check valve (12), so that hydraulic oil can be led toCross the described first other oil circuit (V2) that connects and flow to the rod chamber of described amplitude oil cylinder (5) and oppositely cut-off.
3. working bucket hydraulic control system according to claim 2, wherein, described luffing controlIn loop, be also provided with luffing main operation valve (14), this luffing main operation valve (14) passes through respectively rod chamberConnect oil circuit and be connected with rodless cavity that oil circuit is corresponding is connected to the rod chamber of described amplitude oil cylinder (5) and without barOn chamber, described amplitude oil cylinder balanced valve group (13) comprises the first external control type balanced valve and that structure is identicalTwo external control type balanced valves, described the first external control type balanced valve be arranged on that described rod chamber connects in oil circuit andPilot control oil circuit connects described rodless cavity and connects oil circuit, described in described the second external control type balanced valve is arranged onRodless cavity connects in oil circuit and pilot control oil circuit connects described rod chamber connection oil circuit, wherein, described inThe first other oil circuit (V2) that connects is connected to described the first external control type balanced valve and described amplitude oil cylinder (5)Rod chamber between rod chamber connects in oil circuit part.
4. working bucket hydraulic control system according to claim 1, wherein, this system also comprisesThe second check valve (17), the rod chamber oil circuit of described pressurizing cylinder (7) is connected to described main oil-feed oil circuit(P) tie point (A) in is upper, and described the second check valve (17) is arranged on described tie point (A)In described main oil-feed oil circuit (P) part of one side, to make the hydraulic oil in described pressurizing cylinder (7)Described main oil-feed oil circuit (P) part by described tie point (A) opposite side flows to described leveling controlLoop processed.
5. working bucket hydraulic control system according to claim 1, wherein, this system also comprisesThe first overflow valve (9), this first overflow valve (9) is arranged on described Pressure Increasing Oil-Line (V1) and described systemOn connection oil circuit between system fuel tank (15).
6. working bucket hydraulic control system according to claim 1, wherein, described Pressure Increasing Oil-Line(V1) in, be provided with choke valve (10).
7. working bucket hydraulic control system according to claim 1, wherein, this system also comprisesControl module and be arranged on the obliquity sensor in described working bucket (1), in described leveling control loopBe provided with leveling control valve group (18), this leveling control valve group (18) comprises electric proportional control valve (181),Described control module is used for according to electric proportional control valve (181) described in the signal controlling of described obliquity sensorTo regulate the hydraulic fluid flow rate that flows to described leveling cyclinder (4).
8. working bucket hydraulic control system according to claim 7, wherein, described leveling controlIn valve group (11), also comprise the second overflow valve of the fuel feeding oil pressure for limiting described leveling control loop.
9. an engineering truck, wherein, this project vehicle comprises according in claim 1-8 any oneWorking bucket hydraulic control system described in.
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| CN201310626353.8A CN103629175B (en) | 2013-11-28 | 2013-11-28 | Working bucket hydraulic control system and engineering truck |
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| CN201310626353.8A CN103629175B (en) | 2013-11-28 | 2013-11-28 | Working bucket hydraulic control system and engineering truck |
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| CN103629175A CN103629175A (en) | 2014-03-12 |
| CN103629175B true CN103629175B (en) | 2016-05-04 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106050770A (en) * | 2015-09-02 | 2016-10-26 | 徐州重型机械有限公司 | Emergency landing hydraulic system using oil return logic valve |
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| CN103629175A (en) | 2014-03-12 |
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Address after: 410200 No. 997, Section 2, Tengfei Road, Wangcheng District, Changsha City, Hunan Province Patentee after: Hunan Zoomlion emergency equipment Co., Ltd Patentee after: Zoomlion Co., Ltd Address before: No.997 Jinxing Road, Wangcheng District, Changsha City, Hunan Province Patentee before: Changsha Zhonglian fire fighting Machinery Co., Ltd Patentee before: Zoomlion Co., Ltd |