CN102351005B - Multi-mode steering hydraulic control system and wheeled crane using same - Google Patents
Multi-mode steering hydraulic control system and wheeled crane using same Download PDFInfo
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- CN102351005B CN102351005B CN2011102261290A CN201110226129A CN102351005B CN 102351005 B CN102351005 B CN 102351005B CN 2011102261290 A CN2011102261290 A CN 2011102261290A CN 201110226129 A CN201110226129 A CN 201110226129A CN 102351005 B CN102351005 B CN 102351005B
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Abstract
The invention discloses a multi-mode steering hydraulic control system. In the system, a flow distributing and collecting valve and an electromagnetic reversing valve are combined, the flow distributing and collecting valve distributes flow of a hydraulic source according to a certain proportion and provides energy for the steering system, and the electromagnetic valve controls the flow direction of a hydraulic oil circuit, so that front and rear groups of steering oil cylinders work according to a set requirement and drive wheels to rotate according to the operation intention of a driver to realize multi-mode steering. Compared with the prior art, the scheme has the advantages that: the front and rear steering oil cylinders are connected in parallel in an arbitrary steering mode, so that the problem of a high requirement on sealing property due to overhigh pressure of the front group of steering oil cylinders in the prior art is solved, and manufacturing cost can be effectively controlled; meanwhile, the hydraulic control system eliminates the influence of a circuit fault, and driving safety is ensured. On the basis, the invention also provides a wheeled crane using the multi-mode steering hydraulic control system.
Description
Technical field
The present invention relates to a kind of industrial wheeled equipment, be specifically related to a kind of multi-mode steering hydraulic control system and use the wheel crane of this system.
Background technology
Traditional Passenger motor vehicle, commercial vehicle are sailed and hauling operation in the enterprising every trade of road mostly, and they adopt traditional front-wheel steering or preceding group of wheel steering just can satisfy operating needs.But for sector-specific industrial wheeled equipment, usually need under the site condition of multiple complicacy, work,, have higher requirement for the steering swivel system of industrial wheeled equipment for satisfying the operating needs of complex site.
Such as, need steering swivel system can make vehicle have less turn radius sometimes, shown in Fig. 1-1; Sometimes need steering swivel system can make vehicle accomplish the motion of parallel crab row, shown in Fig. 1-2; Even when the vehicle backward going, also need use back axle (becoming propons during backward going) to turn to according to the operating habit of chaufeur, shown in Fig. 1-3; And when vehicle is run at high speed on normal road, hope only to adopt propons to turn to function, shown in Fig. 1-4.
Obviously, traditional steering swivel system structure has satisfied not the above-mentioned functions requirement, thus, has produced the multi-mode steering technology.Usually adopt two kinds of methods to realize multi-mode steering in the prior art.
Method one: adopt the multi-mode steering valve to turn to control, its principle of work is as shown in Figure 2.Chaufeur is when direction of operating dish 40; All-hydraulic steering gear 30 is exported the hydraulic oil that steering pump provides according to the left-right rotation of bearing circle from A mouth or B mouth; Group turns to oil cylinder 10 and back group to turn to oil cylinder 50 before getting into through multi-mode steering valve 20 then, promotes the wheel left-right rotation.Function such as particularly,, realize that propons independent steering, little turning turn to, back axle independent steering and crab row turn to according to the residing diverse location of the spool of multi-mode steering valve 20.
Method two: adopt electric-hydraulic proportion multi-mode steering system to turn to control, its principle of work is as shown in Figure 3.Wherein, Preceding group wheel is controlled through the steering dish by chaufeur; The corner of back each wheel of group is exported different electric signal with the pattern that turns to that chaufeur is selected through the program of setting in the controller according to the corner size of preceding group of a certain wheel; And then control the aperture of electro-hydraulic proportional valve, the flow of hydraulic oil, and make to turn to oil cylinder to promote wheel according to the operation intention of chaufeur, realize the multi-mode steering function.
Above-mentioned two kinds of prior aries all can realize the different functions that turns to according to actual needs, but receive the restriction of himself structural principle all to have corresponding defects.
Wherein, When adopting the multi-mode steering valve shown in Fig. 2, when the multi-mode steering valve switched to little turning and crab row steering position (that is: valve body is in the 2nd position, left side and the 4th position), forward and backward group of steering hydraulic oil cylinder was a tandem junction structure; The pressure that this moment, hydraulic efficiency pressure system provided is after the promotion propons turns to; Remaining pressure is also wanted to promote rear-axle steering, and group turns to the pressure of oil cylinder excessive before can making like this, and is higher to sealing requirements, cost is higher.
Wherein, When adopting the electric-hydraulic proportion multi-mode shown in Fig. 3; The accuracy of wheel steering angle, sensitivity and reliability too rely on the precision and the reliability of electric elements, Hydraulic Elements; In case electric elements (especially coder, controller) breaks down, steering swivel system can not be according to the intention work of chaufeur, and this is very dangerous for the vehicle of running at high speed.This in addition control system structure relative complex needs the professional to operate, maintenance inconvenience, and cost is also higher relatively.
In view of this, demanding urgently looking for another way proposes a kind of multi-mode steering hydraulic control system, with effective control manufacturing cost, guarantees the security and stability of associative operation.
Summary of the invention
To above-mentioned defective, the technical matters that the present invention solves is, a kind of multi-mode steering hydraulic control system is provided, and uses this control system and can effectively control the complete machine manufacturing cost, and reliable guarantee is provided for the security and stability of associative operation.On this basis, the present invention also provides the wheel crane of this multi-mode steering hydraulic control system of a kind of application.
Multi-mode steering hydraulic control system provided by the invention comprises deflector, and the pressure hydraulic fluid port of said deflector and oil return hydraulic fluid port are communicated with system pressure oil circuit and oil return circuit respectively; Also comprise two flow divider-combiners and both direction control cock, wherein, the hydraulic fluid port that gathers of first flow divider-combiner is communicated with first delivery port of said deflector, and the hydraulic fluid port that gathers of second flow divider-combiner is communicated with second delivery port of said deflector; Wherein, The first direction control cock has four actuator ports and two control positioies; Its first actuator port and second actuator port are communicated with first shunting hydraulic fluid port of said first flow divider-combiner and the first shunting hydraulic fluid port of said second flow divider-combiner respectively, and its 3rd actuator port and the 4th actuator port are communicated with two chambeies of front-axle steering oil cylinder respectively; And said first direction control cock is configured to: at first control position, its first actuator port is communicated with the 3rd actuator port, second actuator port is communicated with the 4th actuator port; At second control position, its first actuator port is communicated with second actuator port, the 3rd actuator port and the 4th actuator port are non-conduction; Wherein, The second direction control cock has four actuator ports and three control positioies; Its first actuator port and second actuator port are communicated with second shunting hydraulic fluid port of said first flow divider-combiner and the second shunting hydraulic fluid port of said second flow divider-combiner respectively, and its 3rd actuator port and the 4th actuator port are communicated with two chambeies of rear axle steering oil cylinder respectively; And said second direction control cock is configured to: at first control position, its first actuator port is communicated with the 3rd actuator port, second actuator port is communicated with the 4th actuator port; At second control position, its first actuator port is communicated with second actuator port, the 3rd actuator port and the 4th actuator port are non-conduction; At the 3rd control position, its first actuator port is communicated with the 4th actuator port, second actuator port is communicated with the 3rd actuator port.
Preferably; Also comprise two hydraulic lock; Be separately positioned between two chambeies and respective direction control cock of two chambeies, rear axle steering oil cylinder of said front-axle steering oil cylinder the path locking under the normality between two chambeies to the respective direction control cock of two chambeies of said front-axle steering oil cylinder, rear axle steering oil cylinder.
Preferably, also comprise four bypass discs, be separately positioned between two hydraulic fluid ports and the respective direction control cock of two said hydraulic lock between the pipeline and fuel tank on the pipeline, and the inlet of each bypass disc all is communicated with said fuel tank.
Preferably, also comprise four by pass valves, two other hydraulic fluid port and corresponding that is separately positioned on two said hydraulic lock turns on two chambeies and the pipeline between the said fuel tank of oil cylinder.
Preferably, said hydraulic lock is made up of two hydraulic control one-way valves, and both control port all is communicated with another person's inlet.
Preferably; Said front-axle steering oil cylinder is specially: be articulated in left front between front left wheel and the preceding bridge seat turn to oil cylinder and be articulated in right front wheel and preceding bridge seat between the right front oil cylinder that turns to, said rear axle steering oil cylinder is specially: be articulated in left back between left back wheel and the back bridge seat turn to oil cylinder and be articulated in right rear wheel and the back bridge seat between the right back oil cylinder that turns to.
Preferably; The 3rd actuator port of said first direction control cock is communicated with the said left front rod chamber of oil cylinder and the said right front rodless cavity of oil cylinder that turns to of turning to, and the 4th actuator port of said first direction control cock is communicated with the said left front rodless cavity of oil cylinder and the said right front rod chamber of oil cylinder that turns to of turning to; The 3rd actuator port of said second direction control cock is communicated with the said left back rodless cavity of oil cylinder and the said right back rod chamber of oil cylinder that turns to of turning to, and the 4th actuator port of said second direction control cock is communicated with the said left back rod chamber of oil cylinder and the said right back rodless cavity of oil cylinder that turns to of turning to.
Preferably, said first direction control cock and second direction control cock are solenoid directional control valve.
Wheel crane provided by the invention comprises wheel undercarriage, also comprises foregoing multi-mode steering hydraulic control system.
Control system according to the invention adopts flow divider-combiner and solenoid directional control valve combination; For steering swivel system the energy is provided with hydraulic power source after according to certain proportional diverting through flow divider-combiner; Come the flow direction of modulated pressure oil circuit to make forward and backward group to turn to oil cylinder through electromagnetic valve by the requirement work of setting; Drive wheel and rotate, realize multi-mode steering according to the operation intention of chaufeur.Compared with prior art, this programme is turning to arbitrarily under the pattern, and its forward and backward oil cylinder that turns to is the parallel connection relation, thereby organizes the excessive higher problem of sealing requirements that causes of pressure that turns to oil cylinder before having avoided in the prior art, can effectively control manufacturing cost; Simultaneously, hydraulic control system has been evaded the influence that circuit breaks down, and has guaranteed traffic safety.
Multi-mode steering hydraulic control system provided by the invention is specially adapted to wheel crane applicable to adopting oil cylinder as the industrial wheeled equipment that turns to execution unit.
Description of drawings
Fig. 1-1, Fig. 1-2, Fig. 1-3 and Fig. 1-4 show several kinds of existing industrial wheeled equipment respectively and turn to pattern diagram;
Fig. 2 adopts the multi-mode steering valve to turn to the fundamental diagram of the prior art of control;
Fig. 3 adopts electric-hydraulic proportion multi-mode steering system to turn to the fundamental diagram of the prior art of control;
Fig. 4 is the fundamental diagram of the hydraulic control system of multi-mode steering described in the specific embodiment;
Fig. 5 is the integral structure scheme drawing of wheel crane described in the specific embodiment.
Among Fig. 4:
Front-wheel 1; Front left wheel 11; Preceding bridge seat 12; Right front wheel 13; Trailing wheel 2; Left back wheel 21; Back bridge seat 22; Right rear wheel 23; The left front oil cylinder 31 that turns to; The right front oil cylinder 32 that turns to; The left back oil cylinder 41 that turns to; The right back oil cylinder 42 that turns to; Deflector 5; First flow divider-combiner 6; The first shunting hydraulic fluid port 61; The second shunting hydraulic fluid port 62; Second flow divider-combiner 7; The first shunting hydraulic fluid port 71; The second shunting hydraulic fluid port 72; First direction control cock 8; First actuator port 81; Second actuator port 82; The 3rd actuator port 83; The 4th actuator port 84; Second direction control cock 9; First actuator port 91; Second actuator port 92; The 3rd actuator port 93; The 4th actuator port 94; Bearing circle 10; Hydraulic lock 11; Bypass disc 12; By pass valve 13.
The specific embodiment
Core of the present invention is to provide a kind of multi-mode steering hydraulic control system that is applied to industrial wheeled equipment, on the basis of satisfying the elemental operation requirement, can guarantee the safe, stable of associative operation, and can effectively control the complete machine manufacturing cost.Specify this embodiment below in conjunction with Figure of description.
See also Fig. 4, the figure shows the fundamental diagram of the said multi-mode steering hydraulic control system of this embodiment.
As shown in the figure, this multi-mode steering hydraulic control system as the power element that turns to operation, is done adaptive rotation to drive front-wheel 1 or trailing wheel 2 with oil cylinder, thereby realizes the function that turns under the different mode.In this embodiment; The front-axle steering oil cylinder is specially left front oil cylinder 31 and the right front oil cylinder 32 that turns to of turning to; Wherein, the left front oil cylinder 31 that turns to is articulated between the preceding bridge seat 12 on front left wheel 11 and the vehicle bridge housing, and the right front oil cylinder 32 that turns to is articulated between right front wheel 13 and the preceding bridge seat 12; The rear axle steering oil cylinder is specially left back oil cylinder 41 and the right back oil cylinder 42 that turns to of turning to, and wherein, the left back oil cylinder 41 that turns to is articulated between left back wheel 21 and the back bridge seat 22, and the right back oil cylinder 42 that turns to is articulated between right rear wheel 23 and the back bridge seat 22.Be to be understood that; For with oil cylinder as the mode that turns to power element; Coaxial left and right two-wheeled is not limited to adopt two of two synchronization actions and turns to oil cylinder to drive respectively; That is to say, also can adopt a left and right two-wheeled synchronization action (not shown) that the oil cylinder driven in synchronism is coaxial, as long as satisfy the use needs all in the scope that the application asks for protection.
Identical with existing hydraulic control steering swivel system is, native system also adopts deflector 5 to set up the conducting between other elements and system pressure oil circuit P and oil return circuit T in the system.During driver's operation bearing circle 10, drive the valve core movement of deflector 5, the side-to-side movement direction of bearing circle 10 has determined first delivery port A of hydraulic steering gear 5 and the fluid of the second delivery port B to flow to.
The hydraulic control principle of this programme compared with prior art has essential distinction, and it effectively cooperates with aforementioned two flow divider-combiners through the both direction control cock, realizes the function that a plurality of patterns turn to.
Wherein, the hydraulic fluid port that gathers of first flow divider-combiner 6 is communicated with the first delivery port A of deflector 5, and the hydraulic fluid port that gathers of second flow divider-combiner 7 is communicated with the second delivery port B of deflector 5; Like this; When bearing circle 10 dextrorotation; Hydraulic oil flows out from the first delivery port A, through first flow divider-combiner 6 pressure oil-source is divided into two, and group steering swivel system and/or back group steering swivel system provide hydraulic power source before promptly being respectively; Compile by second flow divider-combiner 7 then after the second delivery port B flows back to deflector 5, hydraulic reservoir (not shown), realize the hydraulic control circulation.Otherwise when bearing circle 10 was left-handed, hydraulic oil flowed out from the second delivery port B, flowed back to through the first delivery port A from deflector 5 behind the forward and backward group of steering swivel system equally.
Wherein, First direction control cock 8 has four actuator ports and two control positioies; It is configured to: in first control position (the right position of diagram), its first actuator port 81 is communicated with the 3rd actuator port 83, and its second actuator port 82 is communicated with the 4th actuator port 84; In second control position (diagram right position), its first actuator port 81 is communicated with second actuator port 82, the 3rd actuator port 83 and the 4th actuator port 84 are non-conduction.
This first direction control cock 8 is arranged on flow divider-combiner and carries out in the loop between the oil cylinder; As shown in the figure; Its first actuator port 81 is communicated with the first shunting hydraulic fluid port 61 of first flow divider-combiner 6; The first shunting hydraulic fluid port 71 of its second actuator port 82 and second flow divider-combiner 7 is communicated with, and its 3rd actuator port 83 and the 4th actuator port 84 are communicated with two chambeies of front-axle steering oil cylinder respectively.Obviously; Adopt two of two synchronization actions to turn to the separately-driven form of oil cylinder for the coaxial left and right two-wheeled in this programme; The 3rd actuator port 83 and the 4th actuator port of first direction control cock 8 listen annexation to should be: its 3rd actuator port 83 is communicated with the left front rod chamber of oil cylinder 31 and the right front rodless cavity of oil cylinder 32 that turns to of turning to, and its 4th actuator port 84 is communicated with the left front rodless cavity of oil cylinder 31 and the right front rod chamber of oil cylinder 32 that turns to of turning to.
Wherein, second direction control cock 9 has four actuator ports and three control positioies, and it is configured to: in first control position (right position), its first actuator port 91 is communicated with the 3rd actuator port 93, and its second actuator port 92 is communicated with the 4th actuator port 94; At second control position (meta), its first actuator port 91 is communicated with second actuator port 92, and its 3rd actuator port 93 and the 4th actuator port 94 are non-conduction; In the 3rd control position (position, a left side), its first actuator port 91 is communicated with the 4th actuator port 94, and its second actuator port 92 is communicated with the 3rd actuator port 93.
This second direction control cock 9 is arranged on flow divider-combiner and carries out in the loop between the oil cylinder; As shown in the figure; Its first actuator port 91 is communicated with the second shunting hydraulic fluid port 62 of first flow divider-combiner 6; Its second actuator port 92 is communicated with the second shunting hydraulic fluid port 72 of second flow divider-combiner 7, and its 3rd actuator port 93 and the 4th actuator port 94 are communicated with two chambeies of rear axle steering oil cylinder respectively.Likewise; The 3rd actuator port 93 of second direction control cock 9 is communicated with the left back rodless cavity of oil cylinder 41 and the right back rod chamber of oil cylinder 42 that turns to of turning to, and the 4th actuator port 94 of second direction control cock 9 is communicated with the left back rod chamber of oil cylinder 41 and the right back rodless cavity of oil cylinder 42 that turns to of turning to.Preferably, first direction control cock 8 is solenoid directional control valve with second direction control cock 9 and since the both direction control cock all be the work that commutates under the electric situation; In working process; If circuit breaks down, first direction control cock 8 spools can be in right position under action of the spring, and the spool of second direction control cock 9 can be in meta under the effect of spring; Group independent steering pattern had guaranteed traffic safety before vehicle was in.
Four kinds of principle of work that turn to pattern of following brief description.
Preceding group independent steering pattern: first direction control cock 8 is in right position, second direction control cock 9 is in meta.Left front oil cylinder 31, the right front oil cylinder 32 that turns to of turning to of the hydraulic oil promotion of group steering swivel system worked before flowing to, and drives front-wheel 1 and rotates; The hydraulic oil that flows to back group steering swivel system directly flows back to deflector 5 without oil cylinder, and trailing wheel 2 keeps meta motionless, group independent steering function before realizing;
Back group independent steering pattern: first direction control cock 8 is in position, a left side, second direction control cock 9 is in position, a left side or right position.The hydraulic oil of group steering swivel system directly flows back to deflector 5 without oil cylinder before flowing to, and front-wheel 1 keeps meta motionless; The hydraulic oil of organizing steering swivel system after flowing to promotes left back oil cylinder 41 and right back oil cylinder 42 work, 2 rotations of drive trailing wheel, the group independent steering function after realizing of turning to of turning to;
Little turning turns to pattern: first direction control cock 8 is in right position, second direction control cock 9 is in position, a left side.The hydraulic oil of preceding group, back group steering swivel system promotes corresponding steering oil cylinder working respectively, drives wheel respectively, the direction of rotation of front-wheel 1 and trailing wheel 2, thus realize that little turning turns to function;
The crab row turns to pattern: first direction control cock 8 is in right position, second direction control cock 9 is in right position.Before the hydraulic oil of group, back group steering swivel system promote corresponding steering oil cylinder working respectively, drive wheel respectively, front-wheel 1 is identical with the rotation direction of trailing wheel 2, thereby realizing that crab goes turns to function.
Need to prove that this control system need just can turn to mode switch after wheel just returns, whether wheel just returns can be detected through the normally closed limit switch that is installed on the wheel.When limit switch is in off-state, explain that wheel is just returning, second direction control cock 9 just can be cut off the power supply and switched to meta this moment.
In the actual travel operation process,, thereby cause the inner chamber of corresponding oil cylinder to produce bigger transient pressure if wheel runs into hard thing such as sloping bank or stone.For avoiding above-mentioned pressure influence system cruising; This programme also comprises two hydraulic lock 11; Be separately positioned between two chambeies and respective direction control cock of two chambeies, rear axle steering oil cylinder of front-axle steering oil cylinder; Promptly as shown in Figure 4, a hydraulic lock 11 places left front turn to oil cylinder 31, right front turning between oil cylinder 32 and the first direction control cock 8, and another hydraulic lock 11 places left back turn to oil cylinder 41, right back turning between oil cylinder 42 and the second direction control cock 9; Path locking under the normality between two chambeies to the respective direction control cock of two chambeies of front-axle steering oil cylinder, rear axle steering oil cylinder.So design, when arbitrary inner chamber of oil cylinder that turns to forms transient pressure, all can reverse direction flow to deflector 5, influence system's cruising, simultaneously,, impact can not make wheel be in the meta state under not being very big situation yet.
In this embodiment, this hydraulic lock 11 is made up of two hydraulic control one-way valves, and both control port all is communicated with another person's inlet.Should be appreciated that the aforementioned hydraulic lock is not limited to the version shown in Fig. 4, in fact also can adopt the hydraulic lock of different structure form.Such as, constituting by hydraulic control one-way valve and balance cock, both control port all is communicated with (not shown) with another person's inlet.Such as, constituting by two balance cocks, both control port all is communicated with (not shown) with another person's inlet.
In addition; When arbitrary inner chamber that turns to oil cylinder forms transient pressure; Another chamber of this oil cylinder must form negative pressure state, influences the service life of system pipeline and element for avoiding this negative pressure, and this embodiment also comprises four bypass discs 12; Be separately positioned between two hydraulic fluid ports and the respective direction control cock of two hydraulic lock 11 between the pipeline and fuel tank on the pipeline, and the inlet of each bypass disc all is communicated with fuel tank.That is to say that after the oil cylinder side produced negative pressure, the fluid of oil return circuit T flowed into the corresponding vacuum chamber that turns to oil cylinder after will overcoming the spring of corresponding bypass disc 12, after repairing, can avoid negative pressure to influence the service life of system pipeline and element fully.
Further, native system also comprises four by pass valves 13, and two other hydraulic fluid port and corresponding that is separately positioned on two hydraulic lock 11 turns on two chambeies and the pipeline between the fuel tank of oil cylinder.For simplifying drawing, not shown fuel tank among Fig. 4 only illustrates its pressure dependence with oil return circuit T.
Based on aforementioned multi-mode steering hydraulic control system, this embodiment also provides a kind of industrial wheeled equipment, comprises wheel undercarriage and foregoing multi-mode steering hydraulic control system.
This industrial wheeled equipment adopts oil cylinder as the industrial wheeled equipment that turns to execution unit, can be the machinery of realization operations specific, such as, wheeled pump truck or wheel crane etc.See also Fig. 5, this illustrates the integral structure scheme drawing of wheel crane.Need to prove that other functional components of the said hoisting crane of this embodiment are identical with prior art, and not this Applicant's Abstract graph inventive point place, those skilled in the art can realize based on prior art fully.
Special version be, this multi-mode steering hydraulic control system in concrete the application, group wheel steering angle relation before and after can changing through split ratio, the cylinder sizes of adjustment flow divider-combiner, thus can adapt to the operating needs of different vehicle.Certainly, native system also can be applied on the mechanically aided vehicle that turns to, and needs working power deflector replacement hydraulic steering gear 5 this moment, turns to oil cylinder to be installed on the steering mechanical leverage with forward and backward group simultaneously, also can realize the multi-mode steering function.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (9)
1. the multi-mode steering hydraulic control system comprises deflector, and the pressure hydraulic fluid port of said deflector and oil return hydraulic fluid port are communicated with system pressure oil circuit and oil return circuit respectively; It is characterized in that, also comprise:
First flow divider-combiner, it gathers hydraulic fluid port and is communicated with first delivery port of said deflector;
Second flow divider-combiner, it gathers hydraulic fluid port and is communicated with second delivery port of said deflector;
First direction control cock with four actuator ports and two control positioies; Its first actuator port and second actuator port are communicated with first shunting hydraulic fluid port of said first flow divider-combiner and the first shunting hydraulic fluid port of said second flow divider-combiner respectively, and its 3rd actuator port and the 4th actuator port are communicated with two chambeies of front-axle steering oil cylinder respectively; And said first direction control cock is configured to: at first control position, its first actuator port is communicated with the 3rd actuator port, second actuator port is communicated with the 4th actuator port; At second control position, its first actuator port is communicated with second actuator port, the 3rd actuator port and the 4th actuator port are non-conduction;
Second direction control cock with four actuator ports and three control positioies; Its first actuator port and second actuator port are communicated with second shunting hydraulic fluid port of said first flow divider-combiner and the second shunting hydraulic fluid port of said second flow divider-combiner respectively, and its 3rd actuator port and the 4th actuator port are communicated with two chambeies of rear axle steering oil cylinder respectively; And said second direction control cock is configured to: at first control position, its first actuator port is communicated with the 3rd actuator port, second actuator port is communicated with the 4th actuator port; At second control position, its first actuator port is communicated with second actuator port, the 3rd actuator port and the 4th actuator port are non-conduction; At the 3rd control position, its first actuator port is communicated with the 4th actuator port, second actuator port is communicated with the 3rd actuator port.
2. multi-mode steering hydraulic control system according to claim 1; It is characterized in that; Also comprise two hydraulic lock; Be separately positioned between two chambeies and respective direction control cock of two chambeies, rear axle steering oil cylinder of said front-axle steering oil cylinder the path locking under the normality between two chambeies to the respective direction control cock of two chambeies of said front-axle steering oil cylinder, rear axle steering oil cylinder.
3. multi-mode steering hydraulic control system according to claim 2; It is characterized in that; Also comprise four bypass discs; Be separately positioned between two hydraulic fluid ports and the respective direction control cock of two said hydraulic lock between the pipeline and fuel tank on the pipeline, and the inlet of each bypass disc all is communicated with said fuel tank.
4. multi-mode steering hydraulic control system according to claim 3 is characterized in that, also comprises four by pass valves, and two other hydraulic fluid port and corresponding that is separately positioned on two said hydraulic lock turns on two chambeies and the pipeline between the said fuel tank of oil cylinder.
5. according to each described multi-mode steering hydraulic control system in the claim 2 to 4, it is characterized in that said hydraulic lock is made up of two hydraulic control one-way valves, both control port all is communicated with another person's inlet.
6. multi-mode steering hydraulic control system according to claim 5; It is characterized in that; Said front-axle steering oil cylinder is specially: be articulated in left front between front left wheel and the preceding bridge seat turn to oil cylinder and be articulated in right front wheel and preceding bridge seat between the right front oil cylinder that turns to, said rear axle steering oil cylinder is specially: be articulated in left back between left back wheel and the back bridge seat turn to oil cylinder and be articulated in right rear wheel and the back bridge seat between the right back oil cylinder that turns to.
7. multi-mode steering hydraulic control system according to claim 6; It is characterized in that; The 3rd actuator port of said first direction control cock is communicated with the said left front rod chamber of oil cylinder and the said right front rodless cavity of oil cylinder that turns to of turning to, and the 4th actuator port of said first direction control cock is communicated with the said left front rodless cavity of oil cylinder and the said right front rod chamber of oil cylinder that turns to of turning to; The 3rd actuator port of said second direction control cock is communicated with the said left back rodless cavity of oil cylinder and the said right back rod chamber of oil cylinder that turns to of turning to, and the 4th actuator port of said second direction control cock is communicated with the said left back rod chamber of oil cylinder and the said right back rodless cavity of oil cylinder that turns to of turning to.
8. multi-mode steering hydraulic control system according to claim 6 is characterized in that, said first direction control cock and second direction control cock are solenoid directional control valve.
9. wheel crane comprises wheel undercarriage, it is characterized in that, also comprises like each described multi-mode steering hydraulic control system in claim 1 to the claim 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102261290A CN102351005B (en) | 2011-08-08 | 2011-08-08 | Multi-mode steering hydraulic control system and wheeled crane using same |
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| CN2011102261290A CN102351005B (en) | 2011-08-08 | 2011-08-08 | Multi-mode steering hydraulic control system and wheeled crane using same |
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| CN102351005B true CN102351005B (en) | 2012-11-21 |
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