CN102673639B - Hydraulic steering control system and crane with system - Google Patents
Hydraulic steering control system and crane with system Download PDFInfo
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- CN102673639B CN102673639B CN201210172916.6A CN201210172916A CN102673639B CN 102673639 B CN102673639 B CN 102673639B CN 201210172916 A CN201210172916 A CN 201210172916A CN 102673639 B CN102673639 B CN 102673639B
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Abstract
The invention discloses a hydraulic steering control system, which comprises a meso-position locking oil cylinder, a steering oil cylinder and an oil pump, wherein an oil source of the meso-position locking oil cylinder is an energy accumulator which is communicated with an oil outlet of the oil pump; and the hydraulic steering control system is also provided with a pressure control unit; and the pressure control unit is conducted with the oil outlet and an oil return path of the oil pump when the pressure of the energy accumulator is up to a predetermined value. When oil pressure in the energy accumulator arranged in the system reaches the predetermined value, liquid cannot be flushed for the energy accumulator by the oil pump; and when the oil pressure in the energy accumulator is lower than the predetermined value, the liquid is continuously flushed by the oil pump, so that the energy accumulator always keeps the required pressure to stably supply oil for the meso-position locking oil cylinder; and in addition, the phenomenon that the meso-position locking oil cylinder is shaken because the oil pressure is unstable can be avoided, so that the work reliability of the meso-position locking oil cylinder is improved and the safety performance is promoted. The invention also discloses a crane.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly a kind of fluid-link steering control system and there is the hoisting crane of this system.
Background technology
In order to meet the requirement of vehicle to road-holding property, bend carrying capacity, maneuverability, the quantity of car hosit steering shaft is at least one.The demand shifting according to special driving cycle and place, the rear axle of hoisting crane also can participate in turning to, and its steering direction and another steering shaft in the same way or oppositely, turn to after end, need rear axle to get back to meta.In addition, when speed of operation is higher, the road-holding property travelling for improving vehicle high speed, avoids occurring whipping accident, and rear axle also can not participate in steering procedure, and now, rear axle also needs to remain on meta.
Meta locked cylinder is to keep the vitals of rear axle in meta, and therefore, the reliability of meta locked cylinder is most important in rear axle steering system.At present, exist and adopt mechanical caging oil cylinder as meta locked cylinder, this meta locked cylinder was used after a period of time, because the wearing and tearing between component of machine make the tolerance clearance of its piston and connecting rod, became large, cause rear axle not remain on reliably meta, affect the enforcement safety of vehicle.
For this reason, can adopt common meta locked cylinder, during locking, make the rod chamber of meta locked cylinder and rodless cavity all be full of high pressure oil, while turning to, by the hydraulic oil unloading in chamber, this kind of lock mode is compared to upper a kind of, and its mechanical wear degree is minimized, yet, this kind of lock mode, when locking, requires oil pump can meet the requirement that high pressure oil is provided.Generally, adopt fix-displacement pump to carry out fuel feeding, the oil pressure in fix-displacement pump exit is also unstable, and, when needs lock, the oil pressure of fix-displacement pump possibly cannot meet the demand of locking, causes meta locked cylinder to rock, and it is unreliable to lock, and produces potential safety hazard.
In view of this, how providing the fluid-link steering control system of a kind of reliablely and stablely fuel feeding to meta locked cylinder, promote safety performance, is those skilled in the art's technical matterss urgently to be resolved hurrily.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of fluid-link steering control system, this fluid-link steering control system reliablely and stablely fuel feeding, to meta locked cylinder, guarantees the reliable of meta locking, and then promotes safety performance.
Fluid-link steering control system provided by the invention, comprises meta locked cylinder, steering cylinder and oil pump, and the oil sources of described meta locked cylinder is energy storage, and described energy storage is connected with the oil outlet of described oil pump; Also be provided with pressure control unit, when the pressure of described energy storage reaches predetermined value, oil outlet and the oil return line of oil pump described in described pressure control unit conducting.
Preferably, described pressure control unit comprises guide's unloading valve and logical valve, and the two all has import, outlet and control mouth; The import of described logical valve and outlet are communicated with respectively oil outlet and the oil return line of described oil pump, control mouthful the connection oil outlet of described oil pump and an import for described guide's unloading valve; The outlet of described guide's unloading valve and control mouth are communicated with respectively oil return line and described energy storage;
When the control mouth pressure of described guide's unloading valve is not less than predetermined value, its import and outlet are communicated with; When the control mouth pressure of described logical valve is not more than predetermined value, its import and outlet are communicated with.
Preferably, the control mouth of described logical valve to the oil circuit of the oil outlet of described oil pump is provided with flow regulating valve.
Preferably, the control mouth of described logical valve to the oil circuit of the oil outlet of described oil pump is provided with oil filter.
Preferably, described pressure control unit also comprises and is located at described oil pump to the check valve on the oil circuit of described energy storage.
Preferably, described meta locked cylinder comprises first piston, the second piston, is positioned at the intermediate piston of piston rod end, and is fixed on the interfix piece of cylinder barrel middle part perisporium; Described intermediate piston is between first piston and the second piston, and described first piston, the second piston, intermediate piston and cylinder barrel form meta chamber, and the two ends of cylinder barrel have the first chamber and the second chamber, and described meta chamber is communicated with oil return line; Described energy storage and described oil return line, the two is equipped with hydraulic control one-way valve to the loop in described the first chamber and described the second chamber;
Also comprise the first change-over valve and the second change-over valve, the two is all when the first control position, and described energy storage is communicated with two hydraulic control one-way valves by the first change-over valve, and described the second change-over valve is communicated with control mouth and the oil return line of hydraulic control one-way valve described in two; All, when the second control position, described oil return line is communicated with two hydraulic control one-way valves by the first change-over valve, and described the second change-over valve is communicated with control mouth and the described energy storage of hydraulic control one-way valve described in two.
Preferably, the oil sources of described steering cylinder is described energy storage.
Preferably, also be provided with the 3rd change-over valve, described the 3rd change-over valve is in the first control position, described energy storage and oil return line are communicated with respectively the first chamber and second chamber of described steering cylinder, described the 3rd change-over valve is in the second control position, and described energy storage and described oil return line are communicated with respectively the second chamber and first chamber of described steering cylinder.
Preferably, described energy storage, oil return line are provided with safety valve to the oil circuit of described steering cylinder, and the check valve in described safety valve is pilot-operated type check valve, and the control mouth of this check valve is communicated with the oil circuit between described hydraulic control one-way valve and described the first change-over valve; And described the 3rd change-over valve is three-position four-way valve, described the 3rd change-over valve is when the 3rd control position, and described steering cylinder and energy storage disconnect.
This fluid-link steering set-up of control system energy storage and pressure control unit, when in energy storage, oil pressure reaches predetermined value, oil pump no longer rushes liquid for energy storage, when in energy storage, oil pressure is lower than predetermined value, oil pump continues as energy storage and rushes liquid, can guarantee that energy storage remains required pressure.According to the oil pressure demand of meta locked cylinder, can set the reasonable oil pressure of energy storage, i.e. the predetermined value of above-mentioned energy storage oil pressure, and the predetermined value of energy storage oil pressure can realize by the adjustment of pressure control unit.Therefore, this fluid-link steering control system can be stably meta locked cylinder fuel feeding, and the phenomenon of avoiding the unstable meta locked cylinder causing of oil pressure to rock, has improved meta locked cylinder reliable operation degree, has then promoted safety performance.
The present invention also provides a kind of hoisting crane, has vehicle bridge, wheel, and the fluid-link steering control system of controlling described wheel steering or centering, and described fluid-link steering control system is the fluid-link steering control system described in above-mentioned any one.Because above-mentioned fluid-link steering control system has above-mentioned technique effect, the hoisting crane with this fluid-link steering control system also has identical technique effect.
Accompanying drawing explanation
Fig. 1 is the hydraulic schematic diagram of a kind of specific embodiment of fluid-link steering control system provided by the present invention;
Fig. 2 is the structural representation of pressure reduction control unit in Fig. 1;
Fig. 3 is the structural representation of meta locked cylinder in Fig. 1;
Fig. 4 is the hydraulic schematic diagram of the another kind of specific embodiment of fluid-link steering control system provided by the present invention.
In Fig. 1-4:
1 oil pump, 2 pressure control units, 21 pressure reduction sensing elements, 22 guide's unloading valves, 3 energy storages, 4 first change-over valves, 5 second change-over valves, 6 hydraulic control one-way valves, 7 meta locked cylinders, 8 first steering cylinders, 9 second steering cylinders, 10 safety valves, 11 the 3rd change-over valves, 12 wheels, 221 first imports, 222 first outlets, 223 first control mouth, 211 second imports, 212 second outlets, 223 second control mouth, 23 flow regulating valve, 24 oil filters, 25 check valves, 71 first chambeies, 72 intermediate cavity, 73 second chambeies, 74 piston rods, 75 first pistons, 76 intermediate pistons, 77 interfix pieces, 78 second pistons.
The specific embodiment
Core of the present invention is for a kind of fluid-link steering control system being provided and having the hoisting crane of this system, and the fluid-link steering control system providing reliablely and stablely fuel feeding, to meta locked cylinder, guarantees the reliable of meta locking, and then promotes safety performance.
In order to make those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of a kind of specific embodiment of fluid-link steering control system provided by the present invention, and Fig. 2 is the structural representation of pressure reduction control unit in Fig. 1.
Fluid-link steering control system in this embodiment, comprises meta locked cylinder 7, steering cylinder and oil pump 1, in Fig. 1, at vehicle bridge place, is provided with two steering cylinders, is respectively the first steering cylinder 8 and the second steering cylinder 9, controls synchronously turning to of two wheels 12.Wherein, the oil sources of meta locked cylinder 7 is energy storage 3, and meta locked cylinder 7 is by energy storage 3 fuel feeding, and energy storage 3 is connected with oil pump 1, by oil pump 1, for energy storage 3, rushes liquid.
Also be provided with the pressure control unit 2 that maintains energy storage 3 pressure, the pressure control unit 2 in this embodiment comprises guide's unloading valve 22 and logical valve 21, and guide's unloading valve 22 has the first import 221, mouth 223 is controlled in the first outlet 222 and first; Logical valve 21 has the second import 211, mouth 223 is controlled in the second outlet 222 and second.In guide's unloading valve 22 and logical valve 21, be equipped with spring, when the first control mouthful the 223 and second control mouthful 223 places' pressure change, can overcome spring force, promote corresponding spool, and then conducting or disconnection the first import 221 and first outlet the 222, second import 211 and the second outlet 222.
The second import 211 of logical valve 21 is communicated with the oil outlet of oil pumps 1, i.e. in-line, and the second outlet 222 is communicated with oil return lines, and second controls mouthfuls 223 is communicated with the oil outlet of oil pump 1 and first imports 221 of guide's unloading valve 22; The first outlet 222 connection oil return lines of guide's unloading valve 22, an oil inlet for the first control mouthful 223 connection energy storages 3, the first oil pressure of controlling mouth 223 and energy storage 3 is consistent.
Logical valve 21 is main valve, and guide's unloading valve 22 is guide's step valve, and the two is used in conjunction with, and can for energy storage 3, rush liquid by control oil pump 1, and keeps the stable of energy storage 3 pressure, and the working process of the two cooperation is as follows:
When the first, the oil pressure at energy storage 3 places reaches predetermined value, while being not less than predetermined value, the pressure that guide's unloading valve 22 first is controlled mouthful 223 places can overcome the elastic force of valve body inner spring and the spool that promotes guide's unloading valve 22 moves, so that the first import 221 and the first outlet 222 are communicated with, in Fig. 2, spool moves down under first control mouth 223 place's pressure-actings, connects the first import 221 and the first outlet 222.Because second of the first import 221 and logical valve 21 controlled mouthful 223 connections, be communicated with second control mouth 223-first import 221-the first outlet 222-oil return line, so the second pressure of controlling mouthful 223 places reduces gradually, the pressure decreased of controlling mouthful 223 places when second of logical valve 21 to predetermined value, (control and mouthful locate 223 place's pressure predetermined values and arrange respectively by this predetermined value and first, the first control mouthful place's 223 place's pressure predetermined values are energy storage 3 oil pressure predetermined values), while being not more than predetermined value, spring reset in logical valve 21, so that the second import 211 and the second outlet 222 are communicated with, in Fig. 2, on valve body, move, be communicated with oil pump 1 oil outlet-the second import 211-the second outlet 222-oil return line, now, oil pump 1 no longer rushes liquid for energy storage 3, the oil pressure of energy storage 3 remains on predetermined value.
Second, energy storage 3 is after meta locked cylinder 7 fuel feeding or while occurring to leak, oil pressure reduces, when the oil pressure of energy storage 3 reduces and while being less than predetermined value, the pressure that guide's unloading valve 22 first is controlled mouthful 223 places is less than the reset force of valve body inner spring, on the spool of guide's unloading valve 22, move, disconnect the first import 221 and the first outlet 222, second control mouth 223 and oil return line disconnection, because the second control mouth 223 is communicated with oil pump 1 oil outlet, second control mouth 223 in high pressure, the spring promoting in valve body moves down, disconnect the second import 211 and the second outlet 222, oil pump 1 continues as energy storage 3 and rushes liquid.
As can be seen here, in this embodiment, be provided with energy storage 3 and pressure control unit 2, when the interior oil pressure of energy storage 3 reaches predetermined value, oil pump 1 no longer rushes liquid for energy storage 3, the interior oil pressure of energy storage 3 is during lower than predetermined value, and oil pump 1 continues as energy storage 3 and rushes liquid, can guarantee that energy storage 3 remains required pressure.According to the oil pressure demand of meta locked cylinder 7, can set the reasonable oil pressure of energy storage 3, it is the predetermined value of above-mentioned energy storage 3 oil pressure, and the predetermined value of energy storage 3 oil pressure can realize by the adjustment of pressure control unit 2, such as, in above-described embodiment, by adjusting the spring of guide's unloading valve 22, can realize the setting of energy storage 3 oil pressure.Therefore, this fluid-link steering control system can be stably meta locked cylinder 7 fuel feeding, and the phenomenon of avoiding the unstable meta locked cylinder 7 causing of oil pressure to rock, has improved meta locked cylinder 7 reliable operation degree, has then promoted safety performance.
It should be noted that, in above-described embodiment, pressure control unit 2 has adopted guide's unloading valve and logical valve 21, in fact, those skilled in the art also can adopt other can control the element of energy storage 3 pressure, such as the combination of by pass valve, reducing valve equipressure control cock, or coordinate pilot operated valve device to realize the control of pressure.
Further, can on second of logical valve 21 is controlled the oil circuit of mouthful 223 oil outlets to oil pump 1, flow regulating valve 23 be set, as shown in Figure 2, the oil pressure at oil pump 1 oil outlet place is relatively high, arranges after flow regulating valve 23, can relatively reduce the pressure that logical valve 21 second is controlled mouthful 223 places, when energy storage 3 oil pressure reach predetermined value, by guide's unloading valve 22, the second, controlling mouth 223 can quick pressure releasing, conducting the second import 211 and the second outlet 222.Arrange after flow regulating valve 23, can improve the speed of response of pressure control unit 2, now, by adjusting the spring in logical valve 21, in the time of can guaranteeing that energy storage 3 oil pressure do not reach predetermined value, the pressure that mouthful 223 places are controlled in second after throttling is still enough to overcome spring force and disconnects the second import 211 and the second outlet 222.
In addition, for the various embodiments described above, on the oil circuit of the second control mouthful 223 oil outlets to oil pump 1 of logical valve 21, oil filter 24 can also be set, prevent that foreign material from stopping up the second oil circuit control of controlling between mouth 223 and oil pump 1 oil outlet, cause the oil pressure at the second control mouth 223 places cannot disconnect the second import 211 and the second outlet 222, this scheme guarantees that oil pump 1 can rush liquid for energy storage 3.
On the basis of such scheme, pressure reduction control unit can also comprise is located at oil pump 1 to the check valve on the oil circuit of energy storage 3, as shown in Figures 2 and 3, check valve 25 can prevent that the fluid in energy storage 3 is back to oil pump 1, avoid oil pump 1 impaired, when oil pump 1 passes through logical valve 21 pressure release, 25 pairs of energy storages 3 of check valve can also play the effect of pressurize, thereby further guarantee that the oil pressure of energy storage 3 is stable.
For the various embodiments described above, meta locked cylinder 7 can adopt the oil cylinder of piston rod 74 and double-piston separation type, and as shown in Figure 3, Fig. 3 is the structural representation of meta locked cylinder in Fig. 1.The piston rod 74 end covers of this meta locked cylinder 7 have intermediate piston 76, separately be provided with first piston 75 and the second piston 78, and the interfix piece 77 that is fixed on cylinder barrel middle part, intermediate piston 76 is between first piston 75 and the second piston 78, first piston 75, the second piston 78, intermediate piston 76, form intermediate cavity 72 with the cylinder barrel of meta locked cylinder 7, the first chamber 71 and second chamber 73 of the corresponding meta locked cylinder 7 of one side that first piston 75 and the second piston 78 are opposing.Intermediate cavity 72 is communicated with oil return line all the time, when the first chamber 71 and the second chamber 73 all lead to high pressure, first piston 75 and the second piston 78 are all drawn close to middle part, and fixed block 77 in the middle of conflicting, intermediate piston 76 is held between first piston 75 and the second piston 28 the most at last, now, piston rod 74 is positioned middle part, reaches the effect of meta locking; When the first chamber 71 and the second chamber 73 are all communicated with oil return line, the first chamber 71 and the second chamber 73 pressure releases, meta locked cylinder 7 is in quick condition, and wheel 12 can turn under steering cylinder effect.Certainly, also can select common oil cylinder, high pressure oil enters rod chamber and rodless cavity simultaneously, and locked wheel 12, or rod chamber and rodless cavity draining allow wheel 12 to turn to.
In addition, energy storage 3 and oil return line, the two is equipped with hydraulic control one-way valve 6 to the loop in the first chamber 71 and the second chamber 73;
Also comprise the first change-over valve 4 and the second change-over valve 5, in Fig. 1, the first change-over valve 4 and the second change-over valve 5 are two-position three way magnetic valve.Two change-over valves are all when the first control position, as the first change-over valve 4 in Fig. 1 and the second change-over valve 5 all current potential when the next, energy storage 3 is communicated with two hydraulic control one-way valves 6 by the first change-over valve 4, hydraulic oil in energy storage 3 flow to the first chamber 71 and the second chamber 73, meta locked cylinder 7 is positioned at meta, and the control mouth of two hydraulic control one-way valves 6 is communicated with return opening by the second change-over valve 5, and the hydraulic oil in the first chamber 71 and the second chamber 73 cannot reflux; Two change-over valves are all when the second control position, as the first change-over valve 4 in Fig. 1 and the second change-over valve 5 all must not electricity when upper, energy storage 3 is communicated with the control mouth of two hydraulic control one-way valves 6 by the second change-over valve 5, i.e. two hydraulic control one-way valve 6 two-way admittances, two hydraulic control one-way valves 6 are communicated with oil return line by the first change-over valve 4 simultaneously, the first chamber 71 and the second chamber 73 drainings, meta locked cylinder 7 is in quick condition, and wheel 12 can turn to.Two-position three way magnetic valve is only the concrete structure of the first change-over valve 4 and the second change-over valve 5, also can adopt the change-over valve of other kinds, such as two change-over valves being integrated on a change-over valve, is also feasible.By the setting of hydraulic control one-way valve 6, the first change-over valve 4 and the second change-over valve 5, make meta locked cylinder 7 locking or unsteady controllability higher, and control more reliable.
On the basis of the various embodiments described above, can expect, the oil sources of steering cylinder also can adopt energy storage 3, and 3 whiles of energy storage are as the oil sources of steering cylinder and steering cylinder.Now, the 3rd change-over valve 11 can be set, in Fig. 1, the 3rd change-over valve 11 of employing is three position four-way electromagnetic valve, and the 3rd change-over valve 11 is when the first control position, as the 3rd change-over valve 11 in Fig. 1 electric when the left position, energy storage 3 is communicated with the rod chamber of the first steering cylinder 8, the rodless cavity of the second steering cylinder 9, and oil return line is communicated with the rodless cavity of the first steering cylinder 8, the rod chamber of the second steering cylinder 9, and wheel 12 turns left, now, the first change-over valve 4 and the second change-over valve 5 all must not be electric; The 3rd change-over valve 11 electric when the second control position, if the 3rd change-over valve 11 in Fig. 1 is when the right position, oil circuit and the first control position are just the opposite, wheel 12 is turned right, the first change-over valve 4 and the second change-over valve 5 equally must not be electric.The 3rd change-over valve 11 can also arrange meta, in Fig. 1, obtain electric when meta, rod chamber, the rodless cavity of the first steering cylinder 8 and the second steering cylinder 9 are all communicated with oil return line pressure release, so that meta locked cylinder 7 is locked in meta smoothly by two wheels 12, flexible according to meta demand without control two steering cylinders by fluid, now, the first change-over valve 4 and the second change-over valve 5 all electric.For improving the safety of system, at energy storage 3, oil return line, to the oil circuit of steering cylinder, safety valve 10 can also be set, safety valve 10 is comprised of by pass valve and check valve, and its set-up mode can be understood with reference to prior art.
The 3rd change-over valve 11 can be also the three-position four-way valve with O type Median Function, as shown in Figure 4, Fig. 4 is the structural representation of the another kind of specific embodiment of fluid-link steering control system provided by the present invention, the 3rd change-over valve 11 is when meta, and steering cylinder and energy storage 4 and oil return line all disconnect.This embodiment also changes the check valve in safety valve 10 into pilot-operated type check valve, and the control mouth of this pilot-operated type check valve is communicated with the oil circuit between meta locked cylinder 7 place's hydraulic control one-way valves 6 and the first change-over valve 4.In the time of need to locking, oil circuit between meta locked cylinder 7 place's hydraulic control one-way valve 6 to first change-over valves 4 is communicated with energy storage 3, for high pressure, now, pilot-operated type check valve in safety valve 10 is in two-way admittance state, the first steering cylinder 8 and the second steering cylinder 9 can be connected oil return line pressure release by the pilot-operated type check valve in safety valve 10, are convenient to the locking of meta locked cylinder 7, and without be communicated with oil return line by the 3rd change-over valve 11; In the time of need to turning to, the oil circuit between meta locked cylinder 7 place's hydraulic control one-way valve 6 to first change-over valves 4 is communicated with oil return line, is low pressure, and now, the pilot-operated type check valve in safety valve 10 is in one-way conduction state, and safety valve 10 is normally worked.This kind of set-up mode, the pressure release of steering cylinder and the locking of meta locked cylinder 7 interlock are controlled, while avoiding the 3rd change-over valve 11 commutation mistake, the locking of meta locked cylinder 7 is restricted, in fact, now, as long as the meta of the 3rd change-over valve 11 can limit energy storage 5 for steering cylinder fuel feeding.
Except above-mentioned fluid-link steering control system, a kind of hoisting crane is also provided, there is vehicle bridge, wheel 12, and control the fluid-link steering control system that wheel 12 turns to, described fluid-link steering control system is the fluid-link steering control system described in above-mentioned arbitrary embodiment.Because above-mentioned fluid-link steering control system has above-mentioned technique effect, the hoisting crane with above-mentioned hydraulic control system also has identical technique effect, is not repeated herein.
Above fluid-link steering control system provided by the present invention and the hoisting crane with this system are all described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (9)
1. a fluid-link steering control system, comprises meta locked cylinder, steering cylinder and oil pump, it is characterized in that, the oil sources of described meta locked cylinder is energy storage, and described energy storage is connected with the oil outlet of described oil pump; Also be provided with pressure control unit, when the pressure of described energy storage reaches predetermined value, oil outlet and the oil return line of oil pump described in described pressure control unit conducting; Described pressure control unit comprises guide's unloading valve and logical valve, and the two all has import, outlet and control mouth; The import of described logical valve and outlet are communicated with respectively oil outlet and the oil return line of described oil pump, control mouthful the connection oil outlet of described oil pump and an import for described guide's unloading valve; The outlet of described guide's unloading valve and control mouth are communicated with respectively oil return line and described energy storage;
When the control mouth pressure of described guide's unloading valve is not less than predetermined value, its import and outlet are communicated with; When the control mouth pressure of described logical valve is not more than predetermined value, its import and outlet are communicated with.
2. fluid-link steering control system according to claim 1, is characterized in that, the control mouth of described logical valve to the oil circuit of the oil outlet of described oil pump is provided with flow regulating valve.
3. fluid-link steering control system according to claim 1 and 2, is characterized in that, the control mouth of described logical valve to the oil circuit of the oil outlet of described oil pump is provided with oil filter.
4. fluid-link steering control system according to claim 1 and 2, is characterized in that, described pressure control unit also comprises is located at described oil pump to the check valve on the oil circuit of described energy storage.
5. fluid-link steering control system according to claim 1 and 2, is characterized in that, described meta locked cylinder comprises first piston, the second piston, is positioned at the intermediate piston of piston rod end, and is fixed on the interfix piece of cylinder barrel middle part perisporium; Described intermediate piston is between first piston and the second piston, and described first piston, the second piston, intermediate piston and cylinder barrel form meta chamber, and the two ends of cylinder barrel have the first chamber and the second chamber, and described meta chamber is communicated with oil return line; Described energy storage and described oil return line, the two is equipped with hydraulic control one-way valve to the loop in described the first chamber and described the second chamber;
Also comprise the first change-over valve and the second change-over valve, the two is all when the first control position, and described energy storage is communicated with two hydraulic control one-way valves by the first change-over valve, and described the second change-over valve is communicated with control mouth and the oil return line of hydraulic control one-way valve described in two; All, when the second control position, described oil return line is communicated with two hydraulic control one-way valves by the first change-over valve, and described the second change-over valve is communicated with control mouth and the described energy storage of hydraulic control one-way valve described in two.
6. fluid-link steering control system according to claim 5, is characterized in that, the oil sources of described steering cylinder is described energy storage.
7. fluid-link steering control system according to claim 6, it is characterized in that, also be provided with the 3rd change-over valve, described the 3rd change-over valve is in the first control position, described energy storage and oil return line are communicated with respectively the first chamber and second chamber of described steering cylinder, described the 3rd change-over valve is in the second control position, and described energy storage and described oil return line are communicated with respectively the second chamber and first chamber of described steering cylinder.
8. fluid-link steering control system according to claim 7, it is characterized in that, described energy storage, oil return line to the oil circuit of described steering cylinder are provided with safety valve, check valve in described safety valve is pilot-operated type check valve, and the control mouth of this pilot-operated type check valve is communicated with the oil circuit between described hydraulic control one-way valve and described the first change-over valve; And described the 3rd change-over valve is three-position four-way valve, described the 3rd change-over valve is when the 3rd control position, and described steering cylinder and energy storage disconnect.
9. a hoisting crane, has vehicle bridge, wheel, and the fluid-link steering control system of controlling described wheel steering or centering, it is characterized in that, described fluid-link steering control system is the fluid-link steering control system described in claim 1-8 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210172916.6A CN102673639B (en) | 2012-05-29 | 2012-05-29 | Hydraulic steering control system and crane with system |
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| CN201210172916.6A CN102673639B (en) | 2012-05-29 | 2012-05-29 | Hydraulic steering control system and crane with system |
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| CN102673639A CN102673639A (en) | 2012-09-19 |
| CN102673639B true CN102673639B (en) | 2014-09-24 |
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| CN102923187B (en) * | 2012-11-27 | 2015-08-19 | 徐州重型机械有限公司 | The follow-up steering control system of multi-wheeler hoisting crane and multi-wheeler hoisting crane |
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| CN103407488B (en) * | 2013-08-30 | 2017-02-08 | 徐州重型机械有限公司 | Wheel type crane and steering hydraulic control system thereof |
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| CN103963825B (en) * | 2014-05-20 | 2016-08-24 | 徐州重型机械有限公司 | A kind of steering and the wheeled heavy-duty vehicle of independent suspension |
| CN105539573B (en) * | 2015-12-07 | 2018-09-21 | 三一汽车起重机械有限公司 | Positive system is actively returned in a kind of steering of the full Terrain Cranes |
| CN105539577A (en) * | 2015-12-28 | 2016-05-04 | 中国煤炭科工集团太原研究院有限公司 | Full-hydraulic emergent steering system of flameproof vehicle of underground coal mine |
| CN109441899B (en) * | 2018-12-05 | 2024-06-07 | 徐工消防安全装备有限公司 | Walking chassis control system and engineering machinery |
| CN110422229B (en) * | 2019-08-12 | 2021-08-24 | 三一汽车起重机械有限公司 | Pressure feedback control method and controller for vehicle auxiliary steering |
| CN110486336B (en) * | 2019-08-19 | 2020-11-10 | 湖北航天技术研究院特种车辆技术中心 | Integrated steering centering valve group |
| CN111677707A (en) * | 2020-05-09 | 2020-09-18 | 中国船舶重工集团公司第七一六研究所 | Hydraulic control system suitable for automatic butt joint of loading and unloading arm for ship |
| CN111623001B (en) * | 2020-06-23 | 2024-08-30 | 柳工常州机械有限公司 | Safety starting and emergency control device and method for hydraulic system of complete machine |
| CN113062904B (en) * | 2021-02-24 | 2023-07-25 | 安徽柳工起重机有限公司 | Rear axle steering locking valve, hydraulic system and automobile crane |
| CN116164013B (en) * | 2023-02-22 | 2023-08-15 | 广东天恒液压机械有限公司 | Intelligent unloading equipment hydraulic system |
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