CN202574357U - Hydraulic steering control system and cane provided with same - Google Patents
Hydraulic steering control system and cane provided with same Download PDFInfo
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- CN202574357U CN202574357U CN 201220247572 CN201220247572U CN202574357U CN 202574357 U CN202574357 U CN 202574357U CN 201220247572 CN201220247572 CN 201220247572 CN 201220247572 U CN201220247572 U CN 201220247572U CN 202574357 U CN202574357 U CN 202574357U
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Abstract
The utility model discloses a hydraulic steering control system, comprising a middle position locking oil cylinder, a steering oil cylinder and an oil pump, wherein an oil source of the middle position locking oil cylinder is an energy accumulator; the energy accumulator is communicated with an oil outlet of the oil pump; the hydraulic steering control system is further provided with a pressure control unit; and when the pressure of the energy accumulator reaches to a pre-set value, the pressure control unit is communicated with an oil outlet and an oil returning path of the oil pump. When the oil pressure in the energy accumulator arranged on the system reaches to the pre-set value, the oil pump cannot wash liquid for the energy accumulator; when the oil pressure in the energy accumulator is lower than the pre-set value, the oil pump continually washes the liquid for the energy accumulator to guarantee that the energy accumulator keeps the needed pressure all the time, so that oil can be stably supplied to the middle position locking oil cylinder, the phenomenon that the middle position locking oil cylinder is swayed due to the condition that the oil pressure is not stable is avoided, the working reliability of the middle position locking oil cylinder is improved, and the safety performance is continually improved. The utility model further discloses a crane.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly a kind of fluid-link steering control system and the hoisting crane with this system.
Background technology
In order to satisfy the requirement of vehicle to road-holding property, bend carrying capacity, maneuverability property, the quantity of car hosit steering shaft is at least one.According to the demand that shift in special driving cycle and place, the rear axle of hoisting crane also can participate in turning to, its steering direction and another steering shaft in the same way or oppositely, turn to end after, need rear axle to get back to meta.In addition, when speed of operation is higher, for improving the road-holding property that the vehicle high speed is gone, avoid occurring the whipping accident, rear axle also can not participated in steering procedure, and at this moment, rear axle also need remain on meta.
The meta locked cylinder is to keep rear axle to be in the vitals of meta, and therefore, the reliability of meta locked cylinder is most important in the rear axle steering system.At present; Exist and adopt the mechanical caging oil cylinder, after this meta locked cylinder uses a period of time, become big because of the wearing and tearing between the component of machine make the tolerance clearance of its piston and connecting rod as the meta locked cylinder; Cause rear axle not remain on meta reliably, influence the enforcement safety of vehicle.
For this reason, can adopt common meta locked cylinder, during locking; Make the rod chamber and the rodless cavity of meta locked cylinder all be full of high pressure oil, when turning to, the hydraulic oil in the chamber is unloaded; This kind lock mode is compared to last a kind of, and its mechanical wear degree is minimized, yet; This kind lock mode requires the requirement that oil pump can satisfy provides high pressure oil when locking.Generally, adopt fix-displacement pump to carry out fuel feeding, the oil pressure in fix-displacement pump exit is also unstable, and then when needs locked, the oil pressure of fix-displacement pump possibly can't satisfy the demand of locking, causes the meta locked cylinder to rock, and it is unreliable to lock, and produces potential safety hazard.
In view of this, how the fluid-link steering control system of a kind of reliablely and stablely fuel feeding to meta locked cylinder is provided, the improving safety ability is the technical matters that those skilled in the art need to be resolved hurrily.
The utility model content
For solving the problems of the technologies described above, the utility model provides a kind of fluid-link steering control system, and this fluid-link steering control system is fuel feeding to meta locked cylinder reliablely and stablely, guarantees the reliable of meta locking, and then the improving safety ability.
The fluid-link steering control system that the utility model provides comprises the meta locked cylinder, turns to oil cylinder and oil pump, and the oil sources of said meta locked cylinder is an energy storage, and said energy storage is connected with the oil outlet of said oil pump; Also be provided with pressure control unit, when the pressure of said energy storage reaches predetermined value, the oil outlet and the oil return line of the said oil pump of said pressure control unit conducting.
Preferably, said pressure control unit comprises guide's unloading valve and logical valve, and the two all has import, outlet and control mouth; The import of said logical valve and outlet are communicated with the oil outlet and the oil return line of said oil pump respectively, the oil outlet of the control mouthful said oil pump of connection and the import of said guide's unloading valve; The outlet of said guide's unloading valve and control mouth are communicated with oil return line and said energy storage respectively;
When the control mouth pressure of said guide's unloading valve was not less than predetermined value, its import was communicated with outlet; When the control mouth pressure of said logical valve was not more than predetermined value, its import was communicated with outlet.
Preferably, the oil circuit of the oil outlet of the control mouth of said logical valve to said oil pump is provided with flow regulating valve.
Preferably, the oil circuit of the oil outlet of the control mouth of said logical valve to said oil pump is provided with oil filter.
Preferably, said pressure control unit also comprises the check valve of being located on said oil pump to the oil circuit of said energy storage.
Preferably, said meta locked cylinder comprises first piston, second piston, is positioned at the intermediate piston of piston rod end and is fixed in the interfix piece of cylinder barrel middle part perisporium; Said intermediate piston is between the first piston and second piston, and said first piston, second piston, intermediate piston and cylinder barrel form the meta chamber, and the two ends of cylinder barrel have first chamber and second chamber, and said meta chamber is communicated with oil return line; Said energy storage and said oil return line, the two is equipped with hydraulic control one-way valve to the loop in said first chamber and said second chamber;
Also comprise first change-over valve and second change-over valve, when the two all was in first control position, said energy storage was communicated with two hydraulic control one-way valves through first change-over valve, and said second change-over valve is communicated with the control mouth and the oil return line of two said hydraulic control one-way valves; When all being in second control position, said oil return line is communicated with two hydraulic control one-way valves through first change-over valve, and said second change-over valve is communicated with the control mouth and the said energy storage of two said hydraulic control one-way valves.
It is preferably, said that to turn to the oil sources of oil cylinder be said energy storage.
Preferably; Also be provided with the 3rd change-over valve; Said the 3rd change-over valve is in first control position; Said energy storage and oil return line are communicated with said first chamber and second chamber that turns to oil cylinder respectively, and said the 3rd change-over valve is in second control position, and said energy storage and said oil return line are communicated with said second chamber and first chamber that turns to oil cylinder respectively.
Preferably, said energy storage, oil return line to the said oil circuit of oil cylinder that turns to are provided with safety valve, and the check valve in the said safety valve is the pilot-operated type check valve, and the control mouth of this check valve is communicated with the oil circuit between said hydraulic control one-way valve and said first change-over valve; And said the 3rd change-over valve is a three-position four-way valve, and when said the 3rd change-over valve was in the 3rd control position, said oil cylinder and the energy storage of turning to broke off.
This fluid-link steering control system is provided with energy storage and pressure control unit; When oil pressure reached predetermined value in the energy storage, oil pump no longer was that energy storage is towards liquid, when oil pressure is lower than predetermined value in the energy storage; Oil pump continues as energy storage towards liquid, can guarantee that then energy storage remains required pressure.According to the oil pressure demand of meta locked cylinder, can set the reasonable oil pressure of energy storage, the predetermined value of promptly above-mentioned energy storage oil pressure, and the predetermined value of energy storage oil pressure can realize through the adjustment of pressure control unit.Therefore, this fluid-link steering control system can stably be a meta locked cylinder fuel feeding, and the phenomenon that the meta locked cylinder of avoiding the oil pressure instability to cause rocks has improved meta locked cylinder reliable operation degree, has promoted safety performance then.
The utility model also provides a kind of hoisting crane, has vehicle bridge, wheel, and the fluid-link steering control system of controlling said wheel steering or centering, and said fluid-link steering control system is above-mentioned each described fluid-link steering control system.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.
Description of drawings
Fig. 1 provides the hydraulic schematic diagram of a kind of specific embodiment of fluid-link steering control system for the utility model;
Fig. 2 is the structural representation of pressure reduction control unit among Fig. 1;
Fig. 3 is the structural representation of meta locked cylinder among Fig. 1;
Fig. 4 provides the hydraulic schematic diagram of the another kind of specific embodiment of fluid-link steering control system for the utility model.
Among 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 turn to oil cylinder; 9 second turn to oil cylinder; 10 safety valves; 11 the 3rd change-over valves; 12 wheels; 221 first imports; 222 first outlets; 223 first control mouths; 211 second imports; 212 second outlets; 223 second control mouths; 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
The core of the utility model is the hoisting crane that a kind of fluid-link steering control system is provided and has this system, and the fluid-link steering control system that provides is fuel feeding to meta locked cylinder reliablely and stablely, guarantees the reliable of meta locking, and then the improving safety ability.
In order to make those skilled in the art understand the technical scheme of the utility model better, the utility model is done further to specify below in conjunction with accompanying drawing and specific embodiment.
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation that the utility model provides a kind of specific embodiment of fluid-link steering control system, and Fig. 2 is the structural representation of pressure reduction control unit among Fig. 1.
Fluid-link steering control system among this embodiment comprises meta locked cylinder 7, turns to oil cylinder and oil pump 1, is provided with two at the vehicle bridge place among Fig. 1 and turns to oil cylinder, is respectively first and turns to oil cylinder 8 and second to turn to oil cylinder 9, controls turning to synchronously of two wheels 12.Wherein, the oil sources of meta locked cylinder 7 is an energy storage 3, and promptly meta locked cylinder 7 is by energy storage 3 fuel feeding, and energy storage 3 is connected with oil pump 1, is that energy storage 3 is towards liquid by oil pump 1.
Also be provided with the pressure control unit 2 of keeping energy storage 3 pressure, the pressure control unit 2 among this embodiment comprises guide's unloading valve 22 and logical valve 21, and guide's unloading valve 22 has first import 221, first and exports the 222 and first control mouth 223; Logical valve 21 has second import 211, second and exports the 222 and second control mouth 223.Be equipped with spring in guide's unloading valve 22 and the logical valve 21; When first control mouthful 223 and second control mouthful 223 place's pressure change; Can overcome spring force, promote corresponding spool, so conducting or break off first import 221 and first the outlet 222, second import 211 and second the outlet 222.
Second import 211 of logical valve 21 is communicated with the oil outlet of oil pumps 1, i.e. in-line, and second outlet 222 is communicated with oil return lines, and second control mouthfuls 223 is communicated with the oil outlet of oil pumps 1 and first import 221 of guide's unloading valve 22; First outlet, the 222 connection oil return lines of guide's unloading valve 22, the oil inlet of first control mouthful 223 connection energy storages 3, promptly the first control mouth 223 is consistent with the oil pressure of energy storage 3.
When the first, the oil pressure at energy storage 3 places reaches predetermined value; When promptly being not less than predetermined value; The pressure at guide's unloading valve 22 first control 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 first import 221 and first outlet, 222 connections, among Fig. 2; Spool moves down under the first control mouthful 223 places pressure effect, connects first import 221 and first outlet 222.Because second control of first import 221 and logical valve 21 mouthful 223 connections then are communicated with the second control mouthful 223-, the first import 221-, the first outlet 222-oil return line, so the pressure at the second control mouth, 223 places reduces gradually; (this predetermined value and first control mouthful are located 223 place's pressure predetermined values and are provided with respectively when the differential pressure at second control mouthful 223 places of logical valve 21 is low to moderate predetermined value; First control mouthful place's 223 place's pressure predetermined values are energy storage 3 oil pressure predetermined values), when promptly being not more than predetermined value, the spring reset in the logical valve 21; So that second import 211 and second outlet 222 are communicated with; Move on the valve body among Fig. 2, then be communicated with the oil pump 1 oil outlet-second import 211-second outlet 222-oil return line, at this moment; Oil pump 1 no longer be energy storage 3 towards liquid, the oil pressure of energy storage 3 remains on predetermined value.
The second, energy storage 3 is behind meta locked cylinder 7 fuel feeding or when take place leaking, oil pressure reduces, when the oil pressure of energy storage 3 reduces and during less than predetermined value; The pressure at guide's unloading valve 22 first control mouthful 223 places moves on the spool of guide's unloading valve 22 less than the reset force of valve body inner spring, breaks off first import 221 and first outlet 222; Then the second control mouth 223 breaks off with oil return line; Owing to second control mouthful 223 connection oil pumps, 1 oil outlet, then the second control mouth 223 is in high pressure, and the spring that promotes in the valve body moves down; Break off second import 211 and second outlet 222, then oil pump 1 continues as energy storage 3 towards liquid.
This shows; Among this embodiment, be provided with energy storage 3 and pressure control unit 2, when oil pressure reaches predetermined value in the energy storage 3; Oil pump 1 no longer is that energy storage 3 is towards liquid; When oil pressure was lower than predetermined value in the energy storage 3, oil pump 1 continued as energy storage 3 towards liquid, can guarantee that then energy storage 3 remains required pressure.Oil pressure demand according to meta locked cylinder 7; Can set the reasonable oil pressure of energy storage 3; Be the predetermined value of above-mentioned energy storage 3 oil pressure, and the predetermined value of energy storage 3 oil pressure can realize through the adjustment of pressure control unit 2, such as; In the foregoing description, can realize the setting of energy storage 3 oil pressure through the spring of adjustment guide unloading valve 22.Therefore, this fluid-link steering control system can stably be meta locked cylinder 7 fuel feeding, and the phenomenon that the meta locked cylinder 7 of avoiding the oil pressure instability to cause rocks has improved meta locked cylinder 7 reliable operation degree, has promoted safety performance then.
Need to prove; In the foregoing description; Pressure control unit 2 has adopted guide's unloading valve and logical valve 21, and 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, perhaps cooperate pilot operated valve device to realize the control of pressure.
Further, can to the oil circuit of the oil outlet of oil pump 1, flow regulating valve 23 be set at the second control mouth 223 of logical valve 21, as shown in Figure 2; The oil pressure at oil pump 1 oil outlet place is higher relatively, flow regulating valve 23 is set after, can reduce the pressure at logical valve 21 second control mouthful 223 places relatively; When then energy storage 3 oil pressure reach predetermined value; Can quick pressure releasing, conducting second import 211 and second outlet 222 through guide's unloading valve 22, the second control mouths 223.After flow regulating valve 23 promptly is set; Can improve the speed of response of pressure control unit 2; At this moment; Through the spring in the adjustment logical valve 21, in the time of can guaranteeing that energy storage 3 oil pressure do not reach predetermined value, the pressure at the control of second after the throttling mouthful 223 places still is enough to overcome spring force and breaks off second import 211 and export 222 with second.
In addition; To above-mentioned each embodiment; The second control mouth 223 of logical valve 21 can also be provided with oil filter 24 to the oil circuit of the oil outlet of oil pump 1; Prevent that foreign material from stopping up the control oil channel between second control mouthfuls 223 and oil pump 1 oil outlet, cause the oil pressure at second control mouthful 223 places can't break off second import 211 and second and export 222, promptly this scheme guarantee oil pump 1 can for energy storage 3 towards liquid.
On the basis of such scheme; The pressure reduction control unit can also comprise the check valve on the oil circuit of being located at oil pump 1 to energy storage 3, and as shown in Figures 2 and 3, check valve 25 can prevent that the fluid in the energy storage 3 is back to oil pump 1; Avoid oil pump 1 impaired; When oil pump 1 passed through logical valve 21 pressure releases, 25 pairs of energy storages 3 of check valve can also play the effect of pressurize, thereby the oil pressure that further guarantees energy storage 3 is stable.
To above-mentioned each embodiment, 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 among Fig. 1.Piston rod 74 ends of this meta locked cylinder 7 are with intermediate piston 76; Other is provided with the first piston 75 and second piston 78; And the interfix piece 77 that is fixed in cylinder barrel middle part, intermediate piston 76 between the first piston 75 and second piston 78, first piston 75, second piston 78, intermediate piston 76; Form intermediate cavity 72 with the cylinder barrel of meta locked cylinder 7, first chamber 71 and second chamber 73 of the one side correspondence meta locked cylinder 7 that first piston 75 and second piston 78 are opposing.Intermediate cavity 72 is communicated with oil return line all the time; When first chamber 71 and second chamber 73 all led to high pressure, the first piston 75 and second piston 78 were all drawn close to the middle part, and conflict center fixed piece 77; Intermediate piston 76 is held between the first piston 75 and second piston 28 the most at last; At this moment, piston rod 74 is positioned the middle part, reaches the effect of meta locking; When first chamber 71 and second chamber 73 all are communicated with oil return line, first chamber 71 and 73 pressure releases of second chamber, meta locked cylinder 7 is in quick condition, and wheel 12 is turning under the oil cylinder effect and can turn to.Certainly, also can select common oil cylinder for use, high pressure oil gets into 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 first chamber 71 and second chamber 73;
Also comprise first change-over valve 4 and second change-over valve 5, among Fig. 1, first change-over valve 4 and second change-over valve 5 are two-position three way magnetic valve.When two change-over valves all are in first control position; All get current potential when the next like first change-over valve 4 among Fig. 1 and second change-over valve 5; Energy storage 3 is communicated with two hydraulic control one-way valves 6 through first change-over valve 4, hydraulic oil flow to the first chamber 71 and second chamber 73 in the energy storage 3, and 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 through second change-over valve 5, and the hydraulic oil in first chamber 71 and second chamber 73 can't reflux; When two change-over valves all are in second control position; All must not electricity be in when upper like first change-over valve 4 among Fig. 1 and second change-over valve 5, energy storage 3 is communicated with the control mouth of two hydraulic control one-way valves 6, i.e. two hydraulic control one-way valves, 6 two-way admittances through second change-over valve 5; Two hydraulic control one-way valves 6 are communicated with oil return line through first change-over valve 4 simultaneously; Then first chamber 71 and 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 merely the concrete structure of first change-over valve 4 and second change-over valve 5, also can adopt the change-over valve of other kinds, also is feasible such as two change-over valves being integrated on the change-over valve.Through the setting of hydraulic control one-way valve 6, first change-over valve 4 and second change-over valve 5, make that 7 lockings of meta locked cylinder or the controllability of floating are higher, and control is more reliable.
On the basis of above-mentioned each embodiment, can expect that turn to the oil sources of oil cylinder also can adopt energy storage 3, promptly energy storage 3 is simultaneously as turning to oil cylinder and the oil sources that turns to oil cylinder.At this moment, the 3rd change-over valve 11 can be set, among Fig. 1; The 3rd change-over valve 11 that adopts be a three position four-way electromagnetic valve, when the 3rd change-over valve 11 is in first control position, as the 3rd change-over valve 11 among Fig. 1 electric be in a left side the time; Energy storage 3 connections first turn to the rod chamber, second of oil cylinder 8 to turn to the rodless cavity of oil cylinder 9, and oil return line connection first turns to the rodless cavity, second of oil cylinder 8 to turn to the rod chamber of oil cylinder 9, and wheel 12 turns left; At this moment, first change-over valve 4 and second change-over valve 5 all must not; When the 3rd change-over valve 11 must electricly be in second control position, when being in right position like the 3rd change-over valve 11 among Fig. 1, the oil circuit and first control position were just the opposite, and wheel 12 is turned right, and first change-over valve 4 and second change-over valve 5 equally must not.The 3rd change-over valve 11 can also be provided with meta; Among Fig. 1, in the time of must electricly being in meta, first turns to oil cylinder 8 and second to turn to the rod chamber of oil cylinder 9, rodless cavity all to be communicated with the oil return line pressure release; So that meta locked cylinder 7 is locked in meta smoothly with two wheels 12; Need not to turn to oil cylinder flexible according to the meta demand through fluid control two, at this moment, first change-over valve 4 and second change-over valve 5 are all.For improving the safety of system, on energy storage 3, oil return line to the oil circuit that turns to oil cylinder, safety valve 10 can also be set, safety valve 10 is made up 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 also can be the three-position four-way valve with O type meta function; As shown in Figure 4; Fig. 4 provides the structural representation of the another kind of specific embodiment of fluid-link steering control system for the utility model; When the 3rd change-over valve 11 is in meta, turn to oil cylinder and energy storage 4 and oil return line all to break off.This embodiment also changes the check valve in the safety valve 10 into the pilot-operated type check valve, and the control mouth of this pilot-operated type check valve is communicated with the oil circuit between the meta locked cylinder 7 place's hydraulic control one-way valves 6 and first change-over valve 4.When needing locking; Oil circuit between meta locked cylinder 7 place's hydraulic control one-way valves 6 to first change-over valves 4 is communicated with energy storage 3, is high pressure, at this moment; Pilot-operated type check valve in the safety valve 10 is in the two-way admittance state; Then first turn to oil cylinder 8 and second to turn to oil cylinder 9 to connect the oil return line pressure release, be convenient to the locking of meta locked cylinder 7, and need not to be communicated with oil return line through the 3rd change-over valve 11 through the pilot-operated type check valve in the safety valve 10; In the time of need turning to, the oil circuit between meta locked cylinder 7 place's hydraulic control one-way valves 6 to first change-over valves 4 is communicated with oil return line, is low pressure, and at this moment, the pilot-operated type check valve in the safety valve 10 is in unidirectional conducting state, then safety valve 10 normal operation.This kind set-up mode; Make and turn to the pressure release of oil cylinder and the locking coordinated control of meta locked cylinder 7; When avoiding 11 switching-overs of the 3rd change-over valve wrong, the locking of meta locked cylinder 7 is restricted, in fact; At this moment, as long as can limiting energy storage 5, the meta of the 3rd change-over valve 11 is the steering oil oil supply cylinder.
Except above-mentioned fluid-link steering control system, a kind of hoisting crane also is provided, have vehicle bridge, wheel 12, and control the fluid-link steering control system that wheel 12 turns to, said fluid-link steering control system is the described fluid-link steering control system of 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, does not give unnecessary details at this.
More than fluid-link steering control system that the utility model provided and hoisting crane with this system have all been carried out detailed introduction.Used concrete example among this paper the principle and the embodiment of the utility model are set forth, the explanation of above embodiment just is used to help to understand the method and the core concept thereof of the utility model.Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (10)
1. a fluid-link steering control system comprises the meta locked cylinder, turns to oil cylinder and oil pump, it is characterized in that, the oil sources of said meta locked cylinder is an energy storage, and said energy storage is connected with the oil outlet of said oil pump; Also be provided with pressure control unit, when the pressure of said energy storage reaches predetermined value, the oil outlet and the oil return line of the said oil pump of said pressure control unit conducting.
2. fluid-link steering control system according to claim 1 is characterized in that said pressure control unit comprises guide's unloading valve and logical valve, and the two all has import, outlet and control mouth; The import of said logical valve and outlet are communicated with the oil outlet and the oil return line of said oil pump respectively, the oil outlet of the control mouthful said oil pump of connection and the import of said guide's unloading valve; The outlet of said guide's unloading valve and control mouth are communicated with oil return line and said energy storage respectively;
When the control mouth pressure of said guide's unloading valve was not less than predetermined value, its import was communicated with outlet; When the control mouth pressure of said logical valve was not more than predetermined value, its import was communicated with outlet.
3. fluid-link steering control system according to claim 2 is characterized in that, the oil circuit of the oil outlet of the control mouth of said logical valve to said oil pump is provided with flow regulating valve.
4. according to claim 2 or 3 described fluid-link steering control system, it is characterized in that the oil circuit of the oil outlet of the control mouth of said logical valve to said oil pump is provided with oil filter.
5. according to claim 2 or 3 described fluid-link steering control system, it is characterized in that said pressure control unit also comprises the check valve of being located on said oil pump to the oil circuit of said energy storage.
6. according to each described fluid-link steering control system of claim 1-3, it is characterized in that said meta locked cylinder comprises first piston, second piston, be positioned at the intermediate piston of piston rod end and be fixed in the interfix piece of cylinder barrel middle part perisporium; Said intermediate piston is between the first piston and second piston, and said first piston, second piston, intermediate piston and cylinder barrel form the meta chamber, and the two ends of cylinder barrel have first chamber and second chamber, and said meta chamber is communicated with oil return line; Said energy storage and said oil return line, the two is equipped with hydraulic control one-way valve to the loop in said first chamber and said second chamber;
Also comprise first change-over valve and second change-over valve, when the two all was in first control position, said energy storage was communicated with two hydraulic control one-way valves through first change-over valve, and said second change-over valve is communicated with the control mouth and the oil return line of two said hydraulic control one-way valves; When all being in second control position, said oil return line is communicated with two hydraulic control one-way valves through first change-over valve, and said second change-over valve is communicated with the control mouth and the said energy storage of two said hydraulic control one-way valves.
7. fluid-link steering control system according to claim 6 is characterized in that, said to turn to the oil sources of oil cylinder be said energy storage.
8. fluid-link steering control system according to claim 7; It is characterized in that; Also be provided with the 3rd change-over valve, said the 3rd change-over valve is in first control position, and said energy storage and oil return line are communicated with said first chamber and second chamber that turns to oil cylinder respectively; Said the 3rd change-over valve is in second control position, and said energy storage and said oil return line are communicated with said second chamber and first chamber that turns to oil cylinder respectively.
9. fluid-link steering control system according to claim 8; It is characterized in that; Said energy storage, oil return line to the said oil circuit of oil cylinder that turns to are provided with safety valve; Check valve in the said safety valve is the pilot-operated type check valve, and the control mouth of this check valve is communicated with the oil circuit between said hydraulic control one-way valve and said first change-over valve; And said the 3rd change-over valve is a three-position four-way valve, and when said the 3rd change-over valve was in the 3rd control position, said oil cylinder and the energy storage of turning to broke off.
10. a hoisting crane has vehicle bridge, wheel, and the fluid-link steering control system of controlling said wheel steering or centering, it is characterized in that, said fluid-link steering control system is each described fluid-link steering control system of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220247572 CN202574357U (en) | 2012-05-29 | 2012-05-29 | Hydraulic steering control system and cane provided with same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220247572 CN202574357U (en) | 2012-05-29 | 2012-05-29 | Hydraulic steering control system and cane provided with same |
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| CN202574357U true CN202574357U (en) | 2012-12-05 |
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| CN 201220247572 Expired - Lifetime CN202574357U (en) | 2012-05-29 | 2012-05-29 | Hydraulic steering control system and cane provided with same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673639A (en) * | 2012-05-29 | 2012-09-19 | 徐州重型机械有限公司 | Hydraulic steering control system and crane with system |
| CN103661592A (en) * | 2013-12-11 | 2014-03-26 | 中联重科股份有限公司 | Axle steering centering speed control method, equipment and system and engineering machine |
| WO2014082426A1 (en) * | 2012-11-27 | 2014-06-05 | 徐州重型机械有限公司 | Follow-up steering control system of multi-axle automobile crane and multi-axle automobile crane |
| CN110836205A (en) * | 2019-11-21 | 2020-02-25 | 中车青岛四方车辆研究所有限公司 | Active radial executing system and control method for bogie |
| CN112810693A (en) * | 2021-01-08 | 2021-05-18 | 三一汽车起重机械有限公司 | Steering system and engineering machinery |
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2012
- 2012-05-29 CN CN 201220247572 patent/CN202574357U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673639A (en) * | 2012-05-29 | 2012-09-19 | 徐州重型机械有限公司 | Hydraulic steering control system and crane with system |
| CN102673639B (en) * | 2012-05-29 | 2014-09-24 | 徐州重型机械有限公司 | Hydraulic steering control system and crane with system |
| WO2014082426A1 (en) * | 2012-11-27 | 2014-06-05 | 徐州重型机械有限公司 | Follow-up steering control system of multi-axle automobile crane and multi-axle automobile crane |
| US9283986B2 (en) | 2012-11-27 | 2016-03-15 | Xuzhou Heavy Machinery Co., Ltd. | Follow-up steering control system for multi-axle automobile crane, and multi-axle automobile crane |
| CN103661592A (en) * | 2013-12-11 | 2014-03-26 | 中联重科股份有限公司 | Axle steering centering speed control method, equipment and system and engineering machine |
| CN103661592B (en) * | 2013-12-11 | 2016-05-18 | 中联重科股份有限公司 | Vehicle bridge turns to centering method for control speed, equipment, system and engineering machinery |
| CN110836205A (en) * | 2019-11-21 | 2020-02-25 | 中车青岛四方车辆研究所有限公司 | Active radial executing system and control method for bogie |
| CN112810693A (en) * | 2021-01-08 | 2021-05-18 | 三一汽车起重机械有限公司 | Steering system and engineering machinery |
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