CN204898750U - Dipper excavates hydraulic system and hydraulic shovel - Google Patents
Dipper excavates hydraulic system and hydraulic shovel Download PDFInfo
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- CN204898750U CN204898750U CN201520414607.4U CN201520414607U CN204898750U CN 204898750 U CN204898750 U CN 204898750U CN 201520414607 U CN201520414607 U CN 201520414607U CN 204898750 U CN204898750 U CN 204898750U
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Abstract
The utility model relates to a dipper excavates hydraulic system and hydraulic shovel, dipper excavate hydraulic system and include: the first dipper of setting on first oil feed oil circuit allies oneself with and first swing arm allies oneself with, is equipped with the load balancing valve on the oil feed oil circuit before first dipper allies oneself with, and the load balancing valve includes: reflection swing arm running state's control signal can be received to guide's level and proportion choke valve, guide's level, the opening size of controlling ratio choke valve to oil feed flow to the dipper valve allies oneself with is adjusted, so that keep load balancing when dipper and swing arm multiple action. The utility model discloses a dipper excavates hydraulic system can carry out continuously adjustable to the damping of throttling according to the operating condition, and adaptability is stronger, and this load balancing mode need not dismantle to change, and it is convenient to adjust, can improve the operating efficiency when effectively reducing the complete machine oil consumption. In addition, the orifice of this load balancing valve is variable, is difficult to block up because of hydraulic system pollutes to produce, has improved hydraulic system's antipollution ability.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly relates to a kind of dipper and excavates hydraulic system and hydraulic crawler excavator.
Background technology
Hydraulic crawler excavator is a kind of multi-functional mechanical, is widely used at present in the mechanical execution of every field.The structure of hydraulic crawler excavator conventional in engineering reality as shown in Figure 1, be made up of the 1a that gets off, get on the bus 2a and digging arm, digging arm is formed by connecting by swing arm 3a and dipper 6a successively, the end of dipper 6a is connected with scraper bowl 8a, wherein, swing arm 3a is driven by boom cylinder 4a, and dipper 6a is driven by bucket arm cylinder 5a, and scraper bowl 8a is driven by bucket cylinder 7a thus realizes the data mining duty along arrow A.
Hydraulic crawler excavator requires that the various compound actions of realization realize mainly through the control of hydraulic system, excavator hydraulic system is primarily of pump, main valve, rotary motor, running motor, execution cylinder, pipeline and related accessories composition, and the pressure oil that executing agency is exported by main pump respectively joins through main valve and realizes composite move or single movement.The composite move of many executing agencies is frequently applied to owing to excavating continuously, in the operating mode such as the side of getting rid of, and the load difference between each executing agency, cause during hydraulic system concurrent working and can produce larger load deviation, pressure oil meeting preferential flow in such hydraulic system is to the executing agency of low load, thus cause that high capacity executing agency is slow in one's movements even pauses, this can affect the operating efficiency of excavator, and increases complete machine oil consumption.
In order to alleviate this problem, current excavator hydraulic system mainly uses the load deviation between the next balanced different executing agency of fixing damping, the load deviation such as existed between the next balanced dipper excavation of fixing damping is inlayed in dipper connection oil-feed loop and swing arm hoists.Fix choosing of damping in this scheme and vital effect is played to the composite move harmony of complete machine, in dipper loop, the size of damping hole needs the assignment of traffic situation appropriate design according to pump, make the assignment of traffic of pump can great changes will take place if damping hole chooses improper meeting, swing arm action even can be made to produce emptying phenomenon roughly, have a strong impact on the performance of excavator.
In order to debug the harmony of complete machine, the damping hole mainly changing different size one by one by scene at present realizes, and because fixing damping is embedded in main valve dipper connection, so do not possess continuous regulatory function, and dismounting and change also bothers very much.Actual condition difference in addition due to the soil property of debug phase and working condition and client's operation is comparatively large, and the damping hole causing the debug phase to match is not necessarily suitable when client's operation, makes this load balancing mode adaptive capacity poor.
Utility model content
The purpose of this utility model proposes a kind of dipper to excavate hydraulic system and hydraulic crawler excavator, the adaptive capacity of load balancing mode can be made stronger, and improve operating efficiency while effectively reducing complete machine oil consumption.
For achieving the above object, the utility model provides a kind of dipper on the one hand and excavates hydraulic system, comprise: be arranged on the first dipper connection 1 on the first oil-feed oil circuit and the first swing arm connection 2, oil-feed oil circuit before described first dipper connection 1 is provided with load balancing valve 3, described load balancing valve 3 comprises: pilot stage and proportional throttle valve, described pilot stage can receive the control signal of reflection swing arm running status, control the openings of sizes of described proportional throttle valve, thus the oil-feed flow of described first dipper connection 1 is regulated, to make to keep load balancing when dipper and swing arm composite move.
Further, described pilot stage is hydraulic control pilot stage 301, and the pilot control hydraulic fluid port PBb3 of described hydraulic control pilot stage 301 and described first swing arm join the upward leader control port PBb1 of 2 from same control signal source.
Further, described control signal source is for providing the pilot handle 7 of the control signal of swing arm running status.
Further, described load balancing valve 3 also comprises the first one way valve 307, and it is inner that described first one way valve 307 is arranged on described load balancing valve 3, and fluid can be stoped to flow to oil-feed direction.
Further, described load balancing valve 3 also comprises: spool, spring 304 and adjustment screw, and described adjustment screw is arranged on the side of described spool, can regulate the pre compressed magnitude of described spring 304, thus sets a tune point of described load balancing valve 3.
Further, described load balancing valve 3 is 2/2-way hydraulic control guide proportion choke valve.
For achieving the above object, the utility model provides a kind of hydraulic crawler excavator on the other hand, and the dipper comprising boom cylinder, bucket arm cylinder and above-described embodiment excavates hydraulic system.
Further, described dipper excavates hydraulic system and also comprises: be arranged on the second dipper connection 5 on the second oil-feed oil circuit and the second swing arm connection 6, when performing swing arm vertical motion, described first oil-feed oil circuit and described second oil-feed oil circuit collaborate fuel feeding respectively by described first swing arm connection 2 and the second swing arm connection 6 to described boom cylinder, when performing dipper adduction and outer swing does, described first oil-feed oil circuit and described second oil-feed oil circuit collaborate fuel feeding by described first dipper connection 1 and the second dipper connection 5 to described bucket arm cylinder respectively.
Further, the pilot control hydraulic fluid port PBb3 of described load balancing valve 3 and described first swing arm join 2 upward leader control port PBb1 and described second swing arm join the upward leader control port PBb2 of 6 from same control signal source.
Further, the oil return circuit after described second dipper connection 5 is provided with dipper oil return valve 8, and described dipper oil return valve 8 can increase the oil return damping of described bucket arm cylinder when described dipper performs adduction action.
Further, also comprise and detect oil circuit 405, described detection oil circuit 405 is join the closing oil path of 2 normality positions by described first dipper connection 1, described second dipper connection 5, described second swing arm connection 6 and described first swing arm successively, can be judged the whether action of described dipper or swing arm by the pressure detecting described detection oil circuit 405.
Based on technique scheme, the dipper of the utility model embodiment excavates hydraulic system, oil-feed oil circuit before the first dipper connection arranges load balancing valve, the control signal of reflection swing arm running status can be received by pilot stage, the openings of sizes of control ratio choke valve, thus the oil-feed flow of the first dipper connection is regulated, to make to keep load balancing when dipper and swing arm composite move, adaptive capacity is stronger.And this kind of load balancing mode is without the need to dismounting and change, easy to adjust, operating efficiency can be improved while effectively reducing complete machine oil consumption.In addition, the throttle orifice size of load balancing valve is variable, is not easy to produce blocking because of hydraulic system pollution, improves the contamination resistance of hydraulic system.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the lateral view of the utility model hydraulic crawler excavator;
Fig. 2 is the schematic diagram that the utility model dipper excavates an embodiment of hydraulic system;
Fig. 3 is the schematic diagram that the utility model dipper excavates another embodiment of hydraulic system.
Description of reference numerals
1a-gets off; 2a-gets on the bus; 3a-swing arm; 4a-boom cylinder; 5a-bucket arm cylinder; 6a-dipper; 7a-bucket cylinder; 8a-scraper bowl;
1-first dipper joins; 2-first swing arm joins; 3-load balancing valve; 5-second dipper joins; 6-second swing arm joins; 7-pilot handle; 8-dipper oil return valve; 9-second one way valve; 10-the 3rd one way valve; 11-the 4th one way valve; 12-the 5th one way valve; 301-hydraulic control pilot stage; 302-restriction; 303-first hydraulic fluid port; 304-spring; 305-drain tap; 306-second hydraulic fluid port; 307-first one way valve.
Detailed description of the invention
Below describe the utility model in detail.In the following paragraphs, the different aspect of embodiment is defined in more detail.The each side of restriction like this can combine with any other one aspect or many aspects, not may be combined with unless explicitly stated otherwise.Especially, be considered to preferred or favourable any feature and one or morely can be considered to preferred or favourable feature with other.
Terms such as " first ", " second " that occur in the utility model is only for convenience of description, to distinguish the different building blocks with same names, does not represent successively or primary-slave relation.
Hydraulic crawler excavator operationally often can carry out composite move, and such as swing arm rises and dipper excavation action is carried out simultaneously, when carrying out swing arm vertical motion, and boom cylinder large chamber oil-feed, the oil return of boom cylinder loculus, swing arm rises under the effect of cylinder thrust; When excavating action continuously, bucket arm cylinder large chamber oil-feed, the oil return of bucket oil cylinder loculus, dipper is adduction under cylinder thrust and structural member deadweight, thus realizes dipper excavation action.When these two loops adopt same oil sources and concurrent working, load corresponding to each loop need be consistent, otherwise pressure oil can preferential flow to the executing agency of low load.Therefore, needing to add in relevant hydraulic circuit can the element of equally loaded, to make pressure oil substantially can flow into oil circuit corresponding to different loads simultaneously, thus ensures the co-ordination of different executing agency.
Various embodiment given below is all for dipper in hydraulic crawler excavator and hydraulic system corresponding to swing arm, the application of load balancing element is described, certainly, this kind of load balancing element also can be applied in the occasion that there is different loads executing agency composite move in other engineering machinery.
For this reason, the utility model provides a kind of dipper and excavates hydraulic system, hydraulic system principle figure as shown in Figure 2, comprise: be arranged on the first dipper connection 1 on the first oil-feed oil circuit and the first swing arm connection 2, oil-feed oil circuit before the first dipper connection 1 is provided with load balancing valve 3, load balancing valve 3 comprises: pilot stage and proportional throttle valve, pilot stage can receive the control signal of reflection swing arm running status, the openings of sizes of control ratio choke valve, thus the oil-feed flow of bucket rod valve connection 1 is regulated, to make to keep load balancing when dipper and swing arm composite move.
The dipper of the utility model embodiment excavates in hydraulic system, first dipper connection 1 and the first swing arm connection 2 adopt same oil sources fuel feeding, and first dipper connection 1 before oil-feed oil circuit on load balancing valve 3 is set, compared with adopting the scheme of fixing damping in prior art, at least possess one of following several advantages provided:
(1) this kind of load balancing valve does not need carry out in advance debugging thus choose suitable damping, but can regulate continuously according to the damping of state vs's example choke valve of swing arm actual motion, thus the oil-feed flow of the first dipper connection is regulated, solve the function that fixing damping does not possess closed loop feedback adjustment, this makes the adaptive capacity of this kind of load balancing mode to different operating mode stronger.
(2) this kind of load balancing valve is when the damping of comparative example choke valve regulates, without the need to dismounting and change, easy to adjust, is convenient to entirety carries out maintain and replace once break down.
(3) load balancing valve can regulate continuously to the throttling function that the first dipper joins, make dipper and swing arm co-ordination, operating efficiency can be improved while effectively reducing complete machine oil consumption, and reduce to perform when excavating action and fix the pressure loss that damping hole causes.
(4) the throttle orifice size of this kind of load balancing valve is adjustable, is not easy to produce blocking because of hydraulic system pollution, solves the susceptible to plugging problem of aperture little Rong of fixing damping, thus improves the contamination resistance of hydraulic system.
Below the load balancing valve 3 that dipper excavates in hydraulic system is described in detail.Wherein, the pilot stage of load balancing valve 3 can choose different pilot control modes, in one embodiment, pilot stage is hydraulic control pilot stage 301, and the pilot control hydraulic fluid port PBb3 of hydraulic control pilot stage 301 and the first swing arm join the upward leader control port PBb1 of 2 from same control signal source.Preferably, this control signal source, for providing the pilot handle 7 of the control signal of swing arm running status, also can be the actuation member of other type such as control handle or pedal.In this embodiment, operator is by regulating pilot handle 7, swing arm can be controlled to hoist the aperture size of action and regulating load balanced valve 3 simultaneously, the pilot pressure hoisted by swing arm is as the pilot control signal of load balancing valve 3, so just can adjust the running status of swing arm in time, solve the regulatory function that fixing damping does not possess closed loop feedback, improve the compliance of complete machine to different work operating mode.
In another kind of embodiment, pilot stage is automatically controlled pilot stage, during operator adjustment pilot handle 7, the pilot pressure that swing arm hoists can not only be controlled, one can be produced to hoist the identical signal of telecommunication of state variation tendency with swing arm simultaneously, this signal of telecommunication as the control signal of automatically controlled pilot stage, can carry out the aperture size of regulating load balanced valve 3, thus adjusts the running status of swing arm in time.
Excavate in hydraulic system at the dipper that Fig. 2 and Fig. 3 is corresponding, load balancing valve 3 preferably have employed 2/2-way hydraulic control guide proportion choke valve, each is all offered two actuator ports, is respectively: the first hydraulic fluid port 303 and the second hydraulic fluid port 306, in addition, drain tap 305 is also offered.Alternatively, two working position inside are equipped with the first one way valve 307, and fluid can be stoped to the flowing of oil-feed direction, and object is to prevent pressure oil reverse flow and reverse impact oil pump, causing oil pump to be damaged.The oil duct of one of them working position inside is also provided with the continuously adjustable restriction 302 of size.
In addition, this load balancing valve 3 also comprises spool, spring 304 and adjustment screw, adjustment screw is arranged on the side of spool, can the pre compressed magnitude of regulating spring 304 as required, thus point is adjusted in rising of setting load balancing valve 3, solve the problem different operating modes being needed to change spring, make this load balancing valve 3 possess stronger adaptive capacity.
The structure of hydraulic system is excavated to the dipper shown in Fig. 2 below and the course of work is described.When excavating continuously, load mainly dipper, bucket configuration part and the earthwork resistance of bucket arm cylinder, and in dipper the time receiving there is the Exceed load boosting bucket arm cylinders such as self gravitation, and the load of boom cylinder is for getting on the bus the deadweight of all executing agencies and earthwork resistance summation, therefore boom cylinder load is greater than bucket arm cylinder load.According to the principle of the pressure oil preferential flow in hydraulic system to low load circuit, known pressure oil preferentially can flow into the large chamber of bucket arm cylinder thus cause the even intermittent pause of swing arm Slow lifting.
Embodiment of the present utility model by series load balanced valve 3 between oil inlet P 1 and the first dipper join 1, and adopts pilot handle 7 to control the first swing arm connection upward leader signal of 2 and pilot signal of load balancing valve 3 simultaneously.When swing arm has vertical motion, load balancing valve 3 can real-time perception, working position near hydraulic control pilot stage 301 is worked, when first oil-feed oil circuit passes through the first dipper connection 1 to bucket arm cylinder fuel feeding, need to adjust through restriction 302 pairs of flows, and reduce restriction 302 aperture pro rata along with the increase of swing arm upward leader pressure, thus the load deviation effectively between balanced bucket arm cylinder and boom cylinder.When swing arm performs down maneuver, the load that swing arm bears is less, and now load balancing valve 3 works near the working position of spring 304, without the need to adjusting the load deviation between bucket arm cylinder and boom cylinder.
In addition, the utility model additionally provides a kind of hydraulic crawler excavator, and in one embodiment, the dipper that this hydraulic crawler excavator comprises described in boom cylinder, bucket arm cylinder and above-described embodiment excavates hydraulic system.At labor, load balancing valve is after dipper excavates the technique effect that hydraulic system brings, hydraulic crawler excavator of the present utility model also possesses corresponding advantage, such as: adaptive capacity is stronger, operating efficiency can be improved while effectively reducing complete machine oil consumption, to the maintenance of load balancing element with change comparatively convenient, when being subject to for a long time polluting, hydraulic system is not easy blocking etc.
Because hydraulic crawler excavator is when performing dipper excavation and swing arm vertical motion, load is all comparatively large, and especially when performing some special operations, single hydraulic circuit can not meet the demand of operating mode.Thus, in conjunction with the specific application scenario of hydraulic crawler excavator and mode of operation, in the utility model, further provide another kind of embodiment, will describe in detail below.
Excavate in hydraulic system at dipper as shown in Figure 3, comprise two oil-feed oil circuits, for the situation that actuator load is larger, such as perform dipper adduction, outer swing work and swing arm vertical motion time, the mode of two oil-feed oil circuit interflow fuel feeding can be adopted, to increase the driving force to load.Hydraulic system shown in Fig. 3, except comprising Hydraulic Elements in hydraulic system shown in Fig. 2 and loop, also comprise: be arranged on the second dipper connection 5 on the second oil-feed oil circuit and the second swing arm connection 6, when performing swing arm vertical motion, first oil-feed oil circuit and the second oil-feed oil circuit collaborate fuel feeding respectively by the first swing arm connection 2 and the second swing arm connection 6 to boom cylinder, when performing dipper adduction and outer swing does, the first oil-feed oil circuit and the second oil-feed oil circuit collaborate fuel feeding by the first dipper connection 1 and the second dipper connection 5 to bucket arm cylinder respectively.
Wherein, the pilot control hydraulic fluid port PBb3 of load balancing valve 3 and the first swing arm join 2 upward leader control port PBb1 and the second swing arm join the upward leader control port PBb2 of 6 from same control signal source.Preferably, this control signal source is for providing the pilot handle 7 of the control signal of swing arm running status.When swing arm declines, because the load be subject to is less, do not need to carry out load balancing, now load balancing valve 3 can automatically switch to the working position not arranging restriction 302.
Preferably, the first dipper connection 1, first swing arm connection 2 and the second dipper connection 5 are three eight logical pilot operated directional control valves, and the second swing arm connection 6 is two six logical pilot operated directional control valves.
Preferably, in order to prevent pressure oil reverse flow and reverse impact oil pump, oil pump is caused to be damaged, this hydraulic system is provided with one way valve on part oil-feed oil circuit, such as, the oil circuit 401 that load balancing valve 3 and the first dipper join between 1 arranges the second one way valve 9, oil circuit 402 between oil inlet P 2 and the second dipper connection 5 arranges the 3rd one way valve 10, oil circuit 403 between the second swing arm connection 6 and hydraulic fluid port Bb arranges the 4th one way valve 11, and the oil circuit 404 between oil inlet P 1 and the first swing arm connection 2 arranges the 5th one way valve 12.Wherein, the second one way valve 9 only works when dipper performs an action separately, and at this moment the first oil-feed oil circuit joins the internal oil passages of 6 metas by oil inlet P 1, second swing arm and the second one way valve 9 is bucket arm cylinder fuel feeding.
And, second dipper is joined between the oil-feed of 5 left positions and oil return oil duct and is connected by one way valve, main cause is the time receiving in dipper, dipper deadweight and bucket arm cylinder promotion under decline fast, now oil cylinder large chamber oil-feed, need larger flow, the oil return of bucket arm cylinder loculus can be supplemented the large chamber of supply by this one way valve.
In addition, join between the oil-feed of 2 right positions and oil return oil duct at the first swing arm and also connected by one way valve, main cause is that swing arm is in decline process, because deadweight and boom cylinder loculus may form parital vacuum phenomenon for factors such as shortages of oil, the oil return in large for boom cylinder chamber can be supplemented supply loculus by this one way valve.
Understand more clearly to have the function and structure of this hydraulic system, and conveniently describe, define each actuator port here, P1 and P2 is respectively the oil-in of the first oil-feed oil circuit and the second oil-feed oil circuit, and T is oil return opening, and Px is for detecting mouth;
The large chamber of Aa and Ba difference connection bucket rod oil cylinder and loculus, when the time receiving in dipper, Aa oil-feed, Ba oil return, when dipper is put outward, Ba oil-feed, Aa oil return;
Ab with Bb is connected the loculus of boom cylinder and large chamber respectively, when swing arm rises, and Bb oil-feed, Ab oil return, when swing arm declines, Ab oil-feed, Bb oil return;
PAa1 and PBa1 is respectively the adduction of the first dipper connection 1 and outer pendulum pilot control hydraulic fluid port; PAa2 and PBa2 is respectively the adduction of the second dipper connection 5 and outer pendulum pilot control hydraulic fluid port;
PBb1 and PAb1 is respectively rising and the decline pilot control hydraulic fluid port of the first swing arm connection 2; PBb2 is the upward leader control port of the second swing arm connection 6;
The drain tap 305, PBb3 of L2 connection load balancing valve 3 is guide's hydraulic fluid port of load balancing valve 3.
Further, the oil return circuit after the second dipper connection 5 is provided with dipper oil return valve 8, and dipper oil return valve 8 can increase the oil return damping of bucket arm cylinder when dipper performs adduction action.Preferably, dipper oil return valve 8 is 2/2-way pilot operated valve device, offers the first hydraulic control mouth 81 and the second hydraulic control mouth 82, first hydraulic control mouth 81 is connected with oil return inlet T, second 82, hydraulic control mouth is directly connected with hydraulic fluid port Aa, and namely the second hydraulic control mouth 82 is communicated with the large chamber of bucket arm cylinder.The oil pressure at what the first hydraulic control mouth 81 was connected with oil return inlet T act as removal first hydraulic control mouth 81 place, prevent the first hydraulic control mouth 81 and the second dipper connection 5 from forming enclosed cavity, if form enclosed cavity and there is hydraulic oil at the first hydraulic control mouth 81 place, larger flowed friction can be produced at the first hydraulic control mouth 81 place, act on dipper oil return valve 8 together with spring force, the oil liquid pressure at the second hydraulic control mouth 82 place just can not promote oil return valve 8 and commutates thus work.
When the swing arm single movement of hydraulic crawler excavator, if perform swing arm vertical motion, the guide oil of hydraulic fluid port PBb1 and PBb2 works, the left position work of the first swing arm connection 2 and the second swing arm connection 6, because when swing arm rises, load is larger, at this moment need the first oil-feed oil circuit and the second oil-feed oil circuit to collaborate for boom cylinder large chamber fuel feeding by hydraulic fluid port Bb, the fluid of loculus is directly returned from oil return inlet T by the actuator port on hydraulic fluid port Ab and the first swing arm connection 2.If perform swing arm down maneuver, the guide oil of hydraulic fluid port PAb1 works, make load less owing to being subject to the auxiliary of gravity when swing arm declines, thus the right position work of the first swing arm connection 2 is only needed, be boom cylinder loculus fuel feeding by hydraulic fluid port Ab, the fluid in large chamber is directly returned from oil return inlet T by the actuator port on hydraulic fluid port Bb and the first swing arm connection 2.
When the dipper single movement of hydraulic crawler excavator, the first oil-feed oil circuit and the second oil-feed oil circuit interflow are bucket arm cylinder fuel feeding.If perform the action of dipper adduction, the guide oil of hydraulic fluid port PAa1 and PAa2 works, then the first dipper joins the left position work of 1 right position and the second dipper connection 5, the large chamber of bucket arm cylinder is by hydraulic fluid port Aa oil-feed, loculus is by hydraulic fluid port Ba oil return, now the first hydraulic control mouth 81 cut-off is connected with oil return inlet T, and the second hydraulic control mouth 82 is directly connected with hydraulic fluid port Aa.
If the time receiving does not carry out excavation action in dipper, dipper can decline comparatively fast due to Gravitative Loads, then may there is parital vacuum phenomenon in the large chamber of bucket arm cylinder, cause the pressure of hydraulic fluid port Aa lower and the thrust of spring in dipper oil return valve 8 can not be overcome, the working position that dipper oil return valve 8 is connected with the first hydraulic control mouth 81 works, the oil return of bucket arm cylinder loculus needs through restriction, which adds oil return resistance, thus the speed reducing dipper adduction makes the action of dipper adduction more steady.If perform while dipper adduction and excavate action, now because load makes more greatly the pressure of hydraulic fluid port Aa larger, thus the thrust of spring in dipper oil return valve 8 can be overcome, the working position that dipper oil return valve 8 is connected with the second hydraulic control mouth 82 works, and at this moment the oil return of bucket arm cylinder loculus is without restriction.
If execution dipper swings work outward, the guide oil of hydraulic fluid port PBa1 and PBa2 works, then the first dipper joins the right position work of 1 left position and the second dipper connection 5, bucket arm cylinder loculus is by hydraulic fluid port Ba oil-feed, large chamber is by hydraulic fluid port Aa oil return, at this moment the direct oil return in the large chamber of bucket arm cylinder, without the need to through dipper oil return valve 8, can shorten like this dipper put outward needed for time.
When dipper and the swing arm composite move of hydraulic crawler excavator, first oil-feed oil circuit and the second oil-feed oil circuit fuel feeding simultaneously, no matter swing arm performs and rises or down maneuver, the first oil-feed oil circuit by oil inlet P 1 to all can through load balancing valve 3 during bucket arm cylinder fuel feeding.
If dipper action during swing arm execution vertical motion, due to the pilot control hydraulic fluid port PBb3 of load balancing valve 3 and the first swing arm join 2 upward leader control port PBb1 and the second swing arm join the upward leader control port PBb2 of 6 from same control signal source, such as when operator controls pilot handle 7, running status when swing arm rises and the duty of load balancing valve 3 can be controlled simultaneously.When swing arm rises, working position near hydraulic control pilot stage 301 in load balancing valve 3 works, such operator just adjusts the aperture size of restriction 302 by pilot handle 7, thus the oil-feed flow of the first dipper connection 1 is regulated, to make to keep load balancing when dipper and swing arm composite move, avoid the phenomenon that swing arm rising slowly even pauses as far as possible.
If dipper action during swing arm execution down maneuver, the pilot control hydraulic fluid port PBb3 of load balancing valve 3 without pilot control fluid or oil pressure lower, make to work near the working position of spring 304 in load balancing valve 3, then the first oil-feed oil circuit by oil inlet P 1 to during bucket arm cylinder fuel feeding without the need to realizing load balancing through restriction 302.
Further, this dipper excavates hydraulic system and also comprises detection oil circuit 405, detecting oil circuit 405 be join the closing oil path of 2 normality positions by the first dipper connection 1, second dipper connection 5, second swing arm connection 6 and the first swing arm successively, can judge the whether action of dipper or swing arm by the pressure of detection oil circuit 405.
Px is arranged on the detection mouth detected on oil circuit 405, after detection mouth Px passes into hydraulic oil, if hydraulic oil can circulate, then illustrates that dipper and swing arm do not carry out any action; If hydraulic oil is cut off, then illustrates in the first dipper connection 1, second dipper connection 5, second swing arm connection 6 and the first swing arm connection 2 and have at least a valve to be switched to working position, represent that hydraulic crawler excavator has started to perform an action.Detect the status signal that the setting of oil circuit 405 can obtain hydraulic crawler excavator whether action in real time, for ensureing that the coordination of hydraulic crawler excavator entirety has important effect.
Above a kind of dipper excavation hydraulic system provided by the utility model and hydraulic crawler excavator are described in detail.Apply specific embodiment herein to set forth principle of the present utility model and embodiment; the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping, and all employings are equal to the load balancing valve with continuous regulatory function of replacement formation all in the protection domain of this patent.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection domain of the utility model claim.
Claims (11)
1. a dipper excavates hydraulic system, it is characterized in that, comprise: be arranged on the first dipper connection (1) on the first oil-feed oil circuit and the first swing arm connection (2), oil-feed oil circuit before described first dipper connection (1) is provided with load balancing valve (3), described load balancing valve (3) comprising: pilot stage and proportional throttle valve, described pilot stage can receive the control signal of reflection swing arm running status, control the openings of sizes of described proportional throttle valve, thus the oil-feed flow of described first dipper connection (1) is regulated, to make to keep load balancing when dipper and swing arm composite move.
2. dipper according to claim 1 excavates hydraulic system, it is characterized in that, described pilot stage is hydraulic control pilot stage (301), and pilot control hydraulic fluid port (PBb3) and described first swing arm of described hydraulic control pilot stage (301) join the upward leader control port (PBb1) of (2) from same control signal source.
3. dipper according to claim 2 excavates hydraulic system, and it is characterized in that, described control signal source is for providing the pilot handle (7) of the control signal of swing arm running status.
4. dipper according to claim 1 excavates hydraulic system, it is characterized in that, described load balancing valve (3) also comprises the first one way valve (307), it is inner that described first one way valve (307) is arranged on described load balancing valve (3), and fluid can be stoped to flow to oil-feed direction.
5. dipper according to claim 1 excavates hydraulic system, it is characterized in that, described load balancing valve (3) also comprises: spool, spring (304) and adjustment screw, described adjustment screw is arranged on the side of described spool, the pre compressed magnitude of described spring (304) can be regulated, thus set a tune point of described load balancing valve (3).
6. dipper according to claim 1 excavates hydraulic system, and it is characterized in that, described load balancing valve (3) is 2/2-way hydraulic control guide proportion choke valve.
7. a hydraulic crawler excavator, is characterized in that, comprises the arbitrary described dipper of boom cylinder, bucket arm cylinder and claim 1 ~ 6 and excavates hydraulic system.
8. hydraulic crawler excavator according to claim 7, it is characterized in that, described dipper excavates hydraulic system and also comprises: be arranged on the second dipper connection (5) on the second oil-feed oil circuit and the second swing arm connection (6), when performing swing arm vertical motion, described first oil-feed oil circuit and described second oil-feed oil circuit collaborate fuel feeding respectively by described first swing arm connection (2) and the second swing arm connection (6) to described boom cylinder, when performing dipper adduction and outer swing does, described first oil-feed oil circuit and described second oil-feed oil circuit collaborate fuel feeding by described first dipper connection (1) and the second dipper connection (5) to described bucket arm cylinder respectively.
9. hydraulic crawler excavator according to claim 8, it is characterized in that, the pilot control hydraulic fluid port (PBb3) of described load balancing valve (3) and described first swing arm join the upward leader control port (PBb1) of (2) and described second swing arm joins the upward leader control port (PBb2) of (6) from same control signal source.
10. hydraulic crawler excavator according to claim 8, it is characterized in that, oil return circuit after described second dipper connection (5) is provided with dipper oil return valve (8), and described dipper oil return valve (8) can increase the oil return damping of described bucket arm cylinder when described dipper performs adduction action.
11. hydraulic crawler excavators according to claim 8, it is characterized in that, also comprise and detect oil circuit (405), described detection oil circuit (405) is successively by the closing oil path of described first dipper connection (1), described second dipper connection (5), described second swing arm connection (6) and described first swing arm connection (2) normality position, can judge the whether action of described dipper or swing arm by the pressure of the described detection oil circuit (405) of detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110820829A (en) * | 2019-11-21 | 2020-02-21 | 三一重机有限公司 | Broken confluence control system and excavator |
| CN110939619A (en) * | 2019-12-27 | 2020-03-31 | 恒天九五重工有限公司 | Pile machine power head hydraulic system based on excavator multi-way valve |
| CN112554251A (en) * | 2020-11-05 | 2021-03-26 | 鸿程电子工业(南通)有限公司 | Digging machine |
| CN113819105A (en) * | 2021-11-25 | 2021-12-21 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system for electrically proportional controlling multi-working-position valve and control method thereof |
| CN115110600A (en) * | 2022-08-16 | 2022-09-27 | 徐工集团工程机械股份有限公司科技分公司 | Self-adaptive force feedback shoveling control device and method for loader |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110820829A (en) * | 2019-11-21 | 2020-02-21 | 三一重机有限公司 | Broken confluence control system and excavator |
| CN110939619A (en) * | 2019-12-27 | 2020-03-31 | 恒天九五重工有限公司 | Pile machine power head hydraulic system based on excavator multi-way valve |
| CN110939619B (en) * | 2019-12-27 | 2024-05-03 | 恒天九五重工有限公司 | Pile machine power head hydraulic system based on digger multi-way valve |
| CN112554251A (en) * | 2020-11-05 | 2021-03-26 | 鸿程电子工业(南通)有限公司 | Digging machine |
| CN112554251B (en) * | 2020-11-05 | 2022-04-29 | 鸿程电子工业(南通)有限公司 | Digging machine |
| CN113819105A (en) * | 2021-11-25 | 2021-12-21 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system for electrically proportional controlling multi-working-position valve and control method thereof |
| WO2023092667A1 (en) * | 2021-11-25 | 2023-06-01 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system with electro-proportional control multi-working-position valve, and control method thereof |
| CN115110600A (en) * | 2022-08-16 | 2022-09-27 | 徐工集团工程机械股份有限公司科技分公司 | Self-adaptive force feedback shoveling control device and method for loader |
| CN115110600B (en) * | 2022-08-16 | 2023-11-28 | 徐工集团工程机械股份有限公司科技分公司 | Self-adaptive force feedback shoveling control device and method for loader |
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