CN102730563A - Wheeled crane and electronic control steering hydraulic control system thereof - Google Patents
Wheeled crane and electronic control steering hydraulic control system thereof Download PDFInfo
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- CN102730563A CN102730563A CN2012102330897A CN201210233089A CN102730563A CN 102730563 A CN102730563 A CN 102730563A CN 2012102330897 A CN2012102330897 A CN 2012102330897A CN 201210233089 A CN201210233089 A CN 201210233089A CN 102730563 A CN102730563 A CN 102730563A
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Abstract
The invention discloses an electronic control steering hydraulic control system which comprises a hydraulic oil tank communicated with a system oil return oil line, a hydraulic pump, proportional valves, an energy storage device and a directional control valve, wherein the hydraulic pump takes pressure oil liquid from the hydraulic oil tank and outputs the pressure oil liquid to a system pressure oil line; the proportional valves are respectively arranged between a steering cylinder and the system pressure oil line as well as between the steering cylinder and the system oil return oil line to control the stretching of the steering cylinder; the energy storage device is arranged on the system pressure oil line on an upper stream side of the proportional valve; and the directional control valve is arranged between the system pressure oil line and the hydraulic pump or the hydraulic oil tank for communication. According to the electronic control steering hydraulic control system disclosed by the invention, the self driving state parameter of a vehicle is collected by a vehicle body controller; after information is processed by the controller, a control signal is sent to switch the working position of the directional control valve so as to solve the unloading problem of the energy storage device and the pressure oil line connected with the energy storage device; and therefore, the service life of a hydraulic element is prolonged while energy is saved. In addition, the invention also discloses a wheeled crane adopting the electronic control steering hydraulic control system.
Description
Technical field
The present invention relates to the fluid control field, particularly a kind of wheel crane and automatically controlled steering hydraulic control system thereof.
Background technology
Vehicle in the process of moving, reliable, safe automatically controlled steering swivel system is the key that guarantees normal vehicle operation.At present, the full ground of large-tonnage wheel crane adopts the proportional valve control Hydraulic Pump to turning to the fuel feeding in loop, realizes the multiaxis multi-mode steering action on chassis.Because vehicle self structure characteristics, the feed apparatus that turns to of automatically controlled steering swivel system places vehicle front side usually, and control vehicle rear portion axletree turn to oil cylinder, and control this apportioning valve that turns to oil cylinder and place vehicle rear-side, both are communicated with through the pressure oil circuit.In view of the said structure characteristics, there is following shortcoming in this automatically controlled steering swivel system:
1. because the pressure oil circuit is longer, that pressure oil liquid is delivered to the apportioning valve required time is longer for Hydraulic Pump in the automatically controlled steering swivel system, makes vehicle can't carry out handling maneuver immediately, thereby has caused the corresponding hysteresis of automatically controlled steering swivel system;
2. the instantaneous spike of flow that flows through the pressure oil circuit from Hydraulic Pump is prone to cause the shake of Vehicular turn, is unfavorable for the cruising of vehicle;
3. when the engine off vehicle stops, the pressure oil liquid in the pressure oil circuit fails to be back to rapidly hydraulic reservoir, makes Hydraulic Pump be in band and carries a state.Once more during start the engine, Hydraulic Pump needs more high-powerly overcome existing load and can therefore, cause the waste of energy with in the pressure oil liquid PIP oil circuit in the hydraulic reservoir.In addition, be in for a long time under the high pressure conditions, will shorten the service life of pressure oil circuit and Hydraulic Pump.
In order to solve above-mentioned shortcoming in the automatically controlled steering swivel system, a kind of automatically controlled steering hydraulic control system is provided in the prior art, see also Fig. 1, Fig. 1 shows automatically controlled steering swivel system hydraulic control system scheme drawing.
As shown in Figure 1, behind engine starting, drive Hydraulic Pump 02 pressure oil liquid is delivered to the pressure oil circuit from hydraulic reservoir 01, pressure oil liquid flows into energy storage 03 and is turned in the oil cylinder 05 by what apportioning valve 04 was controlled, thus the handling maneuver of control vehicle.This scheme is provided with energy storage 03 turning between oil cylinder 05 and the Hydraulic Pump 02; Before the pressure oil liquid no show still that Hydraulic Pump 02 is seen off turns to oil cylinder 05; Pressure oil liquid in the energy storage 03 flows into via apportioning valve 04 and turns to oil cylinder 05, makes vehicle generation handling maneuver with charging pressure.Obviously, the timely compensation of this scheme through energy storage 03 and the effect that absorbs the flow spike, actv. has solved Vehicular turn response lag and jitter problem when adopting traditional automatically controlled steering swivel system.But after this scheme was still failed to overcome the engine off vehicle and stopped, the pressure oil liquid in the pressure oil circuit can't be back to hydraulic reservoir rapidly and the aforementioned adverse consequences that causes.
In view of this; Demand urgently improving design to existing automatically controlled steering swivel system; When solving that the engine off vehicle is about to stop in the prior art; The off-load of energy storage and the oil feed line that directly links to each other with it, thereby the pressure of elimination Hydraulic Pump and oil feed line finally reach the service life and the purpose of energy saving that prolong Hydraulic Elements.
Summary of the invention
To above-mentioned defective; The object of the present invention is to provide a kind of automatically controlled hydraulic control system that turns to; Be about to stop constantly to solve the engine off vehicle, energy storage and the off-load problem that is communicated with the pressure oil circuit with it, thereby in energy-conservation the service life of prolongation Hydraulic Elements.
Automatically controlled steering hydraulic control system of the present invention comprises:
Hydraulic reservoir, the connected system oil return circuit;
Hydraulic Pump is from said hydraulic reservoir pump pressure power fluid and export the system pressure oil circuit to;
Apportioning valve is arranged on and turns between oil cylinder and system pressure oil circuit and the oil return circuit, to control said the flexible of oil cylinder that turn to;
Energy storage is arranged on the system pressure oil circuit of said apportioning valve upstream side; It is characterized in that, also comprise:
Directional control valve is arranged between said energy storage and said Hydraulic Pump and the said hydraulic reservoir, with system pressure oil circuit and the perhaps conducting between the said hydraulic reservoir of said Hydraulic Pump of controlling said energy storage place.
Preferably, also comprise controller, said controller sends the switching signal of control position to said directional control valve according to engine speed; And be configured to: engine speed is during greater than predetermined value, and said directional control valve is positioned at first control position, and said energy storage is communicated with said Hydraulic Pump; Engine speed is during smaller or equal to predetermined value, and said directional control valve is positioned at second control position, and said energy storage is communicated with said hydraulic reservoir.
Preferably, said engine speed is during smaller or equal to predetermined value, and said delaying time of controller sends said switching signal.
Preferably, said engine speed predetermined value is specially 400-500r/min.
Preferably; Said directional control valve is specially the two-bit triplet solenoid directional control valve; Said two-bit triplet solenoid directional control valve comprises first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port; Said first hydraulic fluid port is communicated with said Hydraulic Pump, and said second hydraulic fluid port is communicated with said energy storage, and said the 3rd hydraulic fluid port is communicated with said hydraulic reservoir.
Preferably, between said Hydraulic Pump and the said directional control valve check valve is set, the oil inlet of said check valve is communicated with said Hydraulic Pump, and the oil outlet of said check valve is communicated with said energy storage.
Preferably, between said Hydraulic Pump and the said hydraulic reservoir by pass valve is set.
Preferably, said energy storage is specially pneumatic accumulator.
Preferably, said by pass valve is specially pilot overflow valve.
The present invention also provides a kind of wheel crane, comprises the steering control system of control wheel axle steer, and said steering control system is specially above-mentioned automatically controlled steering hydraulic control system.
The automatically controlled hydraulic control system that turns to provided by the invention; The hydraulic reservoir that comprises the connected system oil return circuit; Self-hydraulic fuel tank pump pressure power fluid also exports the Hydraulic Pump of system pressure oil circuit to; Be arranged on to turn between oil cylinder and system pressure oil circuit and the oil return circuit and turn to the flexible apportioning valve of oil cylinder, be arranged on the energy storage on the system pressure oil circuit of apportioning valve upstream side, and be arranged on the directional control valve that is communicated with between energy storage place system pressure oil circuit and Hydraulic Pump or the hydraulic reservoir with control.
Engine ignition vehicle launch, directional control valve switch to the control position that is communicated with energy storage and Hydraulic Pump, and Hydraulic Pump pumps into energy storage with hydraulic reservoir internal pressure fluid.Begin to turn to moment in the vehicle ' process, the pressure oil liquid no show still of Hydraulic Pump PIP oil circuit turns to oil cylinder, and the pressure oil liquid that save in the energy storage this moment to turning to oil cylinder that pressure oil liquid is provided, has guaranteed the promptness of handling maneuver via apportioning valve; The engine off vehicle is about to stop, and Hydraulic Pump quits work, and directional control valve switches to the control position that is communicated with energy storage and hydraulic reservoir, this moment energy storage be attached thereto pressure oil circuit internal pressure fluid via in the oil return circuit inflow hydraulic reservoir.
Compare to prior art; The present invention is provided with directional control valve between energy storage and Hydraulic Pump and hydraulic reservoir; The engine off vehicle is about to stop constantly, and energy storage flows into hydraulic reservoir with the interior pressure oil liquid of the pressure oil circuit that is attached thereto rapidly via oil return circuit, makes Hydraulic Elements be in the not subjected to pressure state; The pressure oil circuit can not leak because of being in high pressure conditions for a long time yet, carries a state thereby be in band when having avoided Hydraulic Pump to start once more.Therefore, automatically controlled steering hydraulic control system has prolonged service life of Hydraulic Elements among the present invention under energy-conservation prerequisite.
In the preferred version of the present invention, also comprise controller, controller obtains after the engine speed Treatment Analysis switching signal of sending control position to directional control valve; And be configured to: engine speed is during more than or equal to predetermined value, and directional control valve is positioned at first control position, and energy storage is communicated with Hydraulic Pump; Driving engine is during less than predetermined value, and directional control valve is positioned at second control position, and energy storage is communicated with hydraulic reservoir.Through this autonomous cruise speed system, avoided the engine off vehicle to be about to stop constantly, because human element is failed timely switching direction control cock, and fail the aforementioned adverse consequences that pressure oil circuit off-load to energy storage and connection with it causes.
In the another preferred version among the present invention; The engine speed that controller obtains is by reducing to more than or equal to predetermined value less than after the predetermined value; Send the control position switching signal to directional control valve behind the delaying time of controller certain hour, its objective is to guaranteeing the current stability that turns to mode of operation of vehicle.
Description of drawings
Fig. 1 shows the scheme drawing of existing automatically controlled steering hydraulic control system;
Fig. 2 shows the scheme drawing of automatically controlled steering hydraulic control system in the specific embodiment;
Fig. 3 shows the control flow chart of the directional control valve shown in Fig. 2.
Among the figure:
1 hydraulic reservoir, 2 Hydraulic Pumps, 3 by pass valves, 4 check valves, 5 directional control valves, 6 energy storages, 7 apportioning valves, 8 turn to oil cylinder.
The specific embodiment
Core of the present invention provides a kind of automatically controlled steering hydraulic control system; The engine off vehicle is about to stop constantly in the prior art to solve; The off-load problem of energy storage and the pressure oil circuit that is communicated with it; The consumption of energy when thereby pressure and the Hydraulic Pump of eliminating Hydraulic Elements start once more finally realizes the purpose that prolongs the service life of Hydraulic Elements energy-conservation the time.
Be without loss of generality, specify the specific embodiment of automatically controlled steering hydraulic control system below in conjunction with Figure of description.
See also Fig. 2, Fig. 2 shows automatically controlled steering hydraulic control system scheme drawing in the present embodiment.
Of Fig. 2; Automatically controlled steering hydraulic control system provided by the invention comprises the hydraulic reservoir 1 of connected system oil return circuit; Self-hydraulic fuel tank 1 pump pressure power fluid also exports the Hydraulic Pump 2 of system pressure oil circuit to; Be arranged on and turn to the apportioning valve 7 that turns to oil cylinder 8 to stretch with control between oil cylinder 8 and system pressure oil circuit and the oil return circuit; Be arranged on the energy storage 6 on the system pressure oil circuit of apportioning valve 7 upstream sides, and be arranged on the directional control valve 5 that energy storage 6 place system pressure oil circuits and Hydraulic Pump 2 perhaps are communicated with between the hydraulic reservoir 1.
Engine ignition vehicle launch, directional control valve 5 switch to the control position that is communicated with energy storage 6 and Hydraulic Pump 2, and Hydraulic Pump 2 pumps into energy storage 6 with hydraulic reservoir 1 internal pressure fluid.In the vehicle ' process, begin to turn to moment, the pressure oil liquid no show still of Hydraulic Pump 2 PIP oil circuits turns to oil cylinder 8, and the pressure oil liquid of energy storage 6 interior savings this moment to turning to oil cylinder 8 that pressure is provided, has guaranteed the promptness of handling maneuver via apportioning valve 7; When the engine off vehicle is about to stop; Hydraulic Pump 2 quits work; Directional control valve 5 switches to the control position that is communicated with energy storage 6 and hydraulic reservoir 1, and this moment, energy storage 6 flowed in the hydraulic oil liquid case 1 via oil return circuit with the pressure oil liquid that is attached thereto in the pressure oil circuit.
In the moment that the engine off vehicle is about to stop; The switching of direction of passage control cock 5 control positioies; Energy storage 6 flows into hydraulic reservoir 1 with the interior pressure oil liquid of the pressure oil circuit that is attached thereto rapidly via oil return circuit; Guaranteed that whole oil supply loop is in the not subjected to pressure state, the pressure oil circuit can not leak because of being in high pressure conditions for a long time yet, carries a state thereby be in band when having avoided Hydraulic Pump 2 to start once more.Therefore, automatically controlled steering hydraulic control system has prolonged service life of Hydraulic Elements among the present invention in energy-conservation.
As shown in Figure 2, the directional control valve 5 in this programme is specially the two-bit triplet solenoid directional control valve, and this two-bit triplet solenoid directional control valve comprises first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port; Wherein, First hydraulic fluid port is communicated with Hydraulic Pump 2, and second hydraulic fluid port is communicated with energy storage 6, and the 3rd hydraulic fluid port is communicated with hydraulic reservoir 1; Realize the variation of energy storage and place system pressure oil circuit conducting relation thereof with switching, and can realize the automatic guidance that this valve position switches through control position.See also Fig. 3, Fig. 3 shows the control flow chart of directional control valve in this programme.
As shown in Figure 3, this programme middle controller can read engine speed in the CAN message that is sent by ECU, judges the state of driving engine, promptly works or static, realizes the switching of two-bit triplet solenoid directional control valve control position with this.When engine speed during greater than predetermined value, the outage of two-bit triplet solenoid directional control valve switches to first control position, and promptly energy storage 6 is communicated with Hydraulic Pump 2; When engine speed during smaller or equal to predetermined value, controller sends switching signal, and this moment, the energising of two-bit triplet solenoid directional control valve switched to second control position, and promptly energy storage 6 is communicated with hydraulic reservoir 1, energy storage 6 and the pressure oil circuit off-load of connection with it.
The switching of this programme through the above-mentioned two-bit triplet solenoid directional control valve of controller automatic guidance control position, this design avoided in the process of moving owing to maloperation cause vehicle misroute to, thereby improved vehicle ' process safe property.In addition, reduced operator's labour intensity significantly through automatic guidance.In addition, it is emphasized that also can adopt among the present invention to differ from the mode of pointing out in this programme and read engine speed,, for example adopt other known data acquisition modes such as speed sensor with the switching of control electromagnetic valve control position.
Need to prove that the directional control valve in this programme has specifically been selected the two-bit triplet solenoid directional control valve for use, under the situation that satisfies the directional control valve function, also can adopt other any types.In addition, the predetermined value of the engine speed that controller in this programme is set is specially 400-500r/min, is appreciated that this numerical value sets according to the concrete function parameter of the different model vehicle of this automatically controlled steering swivel system of configuration.Need to prove that this predetermined value must be less than the idling speed of driving engine, thereby the off-load work of guaranteeing automatically controlled steering hydraulic control system can only be accomplished under the engine off state.
Further as shown in Figure 3; The engine speed that reads when controller is during smaller or equal to predetermined value; Export switching signal behind the delaying time of controller certain hour; The energising of two-bit triplet solenoid directional control valve switches to second control position, thereby realizes energy storage 6 and the off-load of the pressure oil circuit of connection with it in the loop.This design is to have avoided vehicle not stop as yet and switch operating position, two-bit triplet electromagnetic valve energising back and cause the automatically controlled inefficacy that turns to, thereby guarantees that current vehicle turns to the stability of mode of operation.It is emphasized that concrete delay time can be according to the variation of the speed of response of hydraulic efficiency pressure system and change, show that according to observed data the reference time delay of 0.01-2s can satisfy the requirement of the automatically controlled steering swivel system of all vehicles.Preferably, the reference time delay of 0.1-0.5s can satisfy the requirement of basic vehicle.
Between Hydraulic Pump 2 and directional control valve 5, be provided with check valve 4 in this programme, the oil inlet of check valve 4 is communicated with Hydraulic Pump 2, and its oil outlet is communicated with energy storage 6.This design-calculated purpose is the flow direction for restriction pressure fluid, the pressure oil liquid that promptly pumps by Hydraulic Pump 2 can only single flow direction energy storage 6 with turn to oil cylinder 8, prevented that backflow because of pressure oil liquid from causing the damage of Hydraulic Pump.
The working process of automatically controlled steering hydraulic control system in this programme is described below in conjunction with Fig. 2 and Fig. 3:
One, behind the engine ignition vehicle launch, the engine speed that controller obtains is greater than predetermined value, and the outage of two-bit triplet solenoid directional control valve switches to first control position, and promptly first hydraulic fluid port is communicated with Hydraulic Pump 2 and energy storage 6 with second hydraulic fluid port.This moment, Hydraulic Pump 2 was in the pressure oil liquid PIP oil circuit in the hydraulic reservoir 1, opened along with pressure in the pressure oil circuit constantly increases check valve 4, and pressure oil liquid flow through check valve 4 and two-bit triplet solenoid directional control valve 5 get into energy storage 6.
Two, in the time of need taking turns axle steer control, apportioning valve 7 is according to turning to needs switch operating position and aperture to regulate, and like this, thereby pressure oil liquid flows into the handling maneuver that turns to oil cylinder 8 to realize vehicle via apportioning valve 7 again.
Three, be about to stop constantly when the engine off vehicle; The engine speed that controller obtains is smaller or equal to predetermined value; Export switching signal behind the delaying time of controller certain hour; The energising of two-bit triplet solenoid directional control valve switches to second control position, and promptly the 3rd hydraulic fluid port is communicated with pressure oil liquid case 1 and energy storage 6 with second hydraulic fluid port.At this moment, energy storage 6 passes through the two-bit triplet solenoid directional control valve with the interior pressure oil liquid of the pressure oil circuit that is attached thereto, and flows into hydraulic reservoir 1 via oil return circuit.
Need to prove that the principle of work of apportioning valve 7 is identical with prior art, because this apportioning valve 7 belongs to corresponding matching relationship and the not this Applicant's Abstract graph inventive point of turning between the oil cylinder 8, so do not specify the concrete structure of apportioning valve 7 in this programme.
In addition; Between Hydraulic Pump 2 and hydraulic reservoir 1, by pass valve 3 is set in this programme; When the pressure oil circuit when turning to oil pressure in the oil cylinder to reach certain numerical value; By pass valve 3 is opened under this pressure effect, and the pressure oil liquid that newly pumps into is directly flow in the hydraulic reservoir 1 through oil return circuit, and the pressure that this design keeps turning to oil cylinder 8 and oil supply loop is within safe range.This shows that the pressure of total system all is within the pressure unloading scope of by pass valve 3, pressure can not raise always and damage the hydraulic pressure components and parts.
It is emphasized that the energy storage 6 in this programme is specially pneumatic accumulator, by pass valve 3 is specially pilot overflow valve, under the prerequisite of the function that satisfies above-mentioned both Hydraulic Elements, can also select other types for use.
Except that aforementioned automatically controlled steering hydraulic control system, the present invention also provides a kind of wheel crane, comprises the steering control system of control wheel axle steer, and this steering control system is specially above-mentioned automatically controlled steering hydraulic control system.Be appreciated that the basic function parts that constitute this wheel crane and principle of work and prior art are basic identical, those skilled in the art can realize based on prior art fully, so this paper repeats no more.
The above is merely the preferred embodiment for the present invention, does not constitute the qualification to protection domain of the present invention.Any any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection domain of the present invention.
Claims (10)
1. automatically controlled steering hydraulic control system comprises:
Hydraulic reservoir, the connected system oil return circuit;
Hydraulic Pump is from said hydraulic reservoir pump pressure power fluid and export the system pressure oil circuit to;
Apportioning valve is arranged on and turns between oil cylinder and system pressure oil circuit and the oil return circuit, to control said the flexible of oil cylinder that turn to;
Energy storage is arranged on the system pressure oil circuit of said apportioning valve upstream side; It is characterized in that, also comprise:
Directional control valve is arranged between said energy storage and said Hydraulic Pump and the said hydraulic reservoir, with system pressure oil circuit and the perhaps conducting between the said hydraulic reservoir of said Hydraulic Pump of controlling said energy storage place.
2. automatically controlled steering hydraulic control system according to claim 1 is characterized in that, also comprises controller, and said controller sends the switching signal of control position to said directional control valve according to engine speed; And be configured to: engine speed is during greater than predetermined value, and said directional control valve is positioned at first control position, and said energy storage is communicated with said Hydraulic Pump; Engine speed is during smaller or equal to predetermined value, and said directional control valve is positioned at second control position, and said energy storage is communicated with said hydraulic reservoir.
3. automatically controlled steering hydraulic control system according to claim 2 is characterized in that, said engine speed is during smaller or equal to predetermined value, and said delaying time of controller sends said switching signal.
4. automatically controlled steering hydraulic control system according to claim 3 is characterized in that, said engine speed predetermined value is specially 400-500r/min.
5. automatically controlled steering hydraulic control system according to claim 4; It is characterized in that; Said directional control valve is specially the two-bit triplet solenoid directional control valve, and said two-bit triplet solenoid directional control valve comprises first hydraulic fluid port, second hydraulic fluid port and the 3rd hydraulic fluid port, and said first hydraulic fluid port is communicated with said Hydraulic Pump; Said second hydraulic fluid port is communicated with said energy storage, and said the 3rd hydraulic fluid port is communicated with said hydraulic reservoir.
6. according to each described automatically controlled steering hydraulic control system in the claim 1 to 5; It is characterized in that; Between said Hydraulic Pump and the said directional control valve check valve is set, the oil inlet of said check valve is communicated with said Hydraulic Pump, and the oil outlet of said check valve is communicated with said energy storage.
7. automatically controlled steering hydraulic control system according to claim 6 is characterized in that, between said Hydraulic Pump and the said hydraulic reservoir by pass valve is set.
8. automatically controlled steering hydraulic control system according to claim 7 is characterized in that said energy storage is specially pneumatic accumulator.
9. automatically controlled steering hydraulic control system according to claim 8 is characterized in that said by pass valve is specially pilot overflow valve.
10. a wheel crane comprises the steering control system of controlling the wheel axle steer, it is characterized in that said steering control system is like each described automatically controlled steering hydraulic control system in the claim 1 to 9.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103030065A (en) * | 2012-12-26 | 2013-04-10 | 三一重工股份有限公司 | Hydraulic locking control system, hydraulic assembly of crane, and crane |
| CN103407488A (en) * | 2013-08-30 | 2013-11-27 | 徐州重型机械有限公司 | Wheel type crane and steering hydraulic control system thereof |
| CN103465956A (en) * | 2013-09-27 | 2013-12-25 | 徐州重型机械有限公司 | Steering control valve, engineering vehicle steering system and steering striking resistant method |
| CN106029470A (en) * | 2013-12-19 | 2016-10-12 | 沃尔沃建筑设备公司 | A hydraulic load sensing system |
| CN106794974A (en) * | 2014-08-27 | 2017-05-31 | 株式会社斗山 | Fork truck hydraulic circuit |
| CN107934784A (en) * | 2017-11-24 | 2018-04-20 | 徐州重型机械有限公司 | A kind of fuel tank pressue device, control method and its crane |
| CN110203274A (en) * | 2019-04-09 | 2019-09-06 | 丰疆智能科技股份有限公司 | The automatic steering system and its method of automatic harvester |
| CN111943048A (en) * | 2020-07-30 | 2020-11-17 | 湖南双达机电有限责任公司 | Control method and control system of hoisting machinery, hydraulic system and hoisting machinery |
| CN114715266A (en) * | 2022-03-31 | 2022-07-08 | 湖南三一华源机械有限公司 | Steering brake assembly, control method and control device thereof and engineering vehicle |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103030065A (en) * | 2012-12-26 | 2013-04-10 | 三一重工股份有限公司 | Hydraulic locking control system, hydraulic assembly of crane, and crane |
| CN103030065B (en) * | 2012-12-26 | 2014-11-19 | 三一重工股份有限公司 | Hydraulic locking control system, hydraulic assembly of crane, and crane |
| CN103407488A (en) * | 2013-08-30 | 2013-11-27 | 徐州重型机械有限公司 | Wheel type crane and steering hydraulic control system thereof |
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| CN106029470A (en) * | 2013-12-19 | 2016-10-12 | 沃尔沃建筑设备公司 | A hydraulic load sensing system |
| CN106794974A (en) * | 2014-08-27 | 2017-05-31 | 株式会社斗山 | Fork truck hydraulic circuit |
| CN107934784A (en) * | 2017-11-24 | 2018-04-20 | 徐州重型机械有限公司 | A kind of fuel tank pressue device, control method and its crane |
| CN110203274A (en) * | 2019-04-09 | 2019-09-06 | 丰疆智能科技股份有限公司 | The automatic steering system and its method of automatic harvester |
| CN111943048A (en) * | 2020-07-30 | 2020-11-17 | 湖南双达机电有限责任公司 | Control method and control system of hoisting machinery, hydraulic system and hoisting machinery |
| CN114715266A (en) * | 2022-03-31 | 2022-07-08 | 湖南三一华源机械有限公司 | Steering brake assembly, control method and control device thereof and engineering vehicle |
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| CN102730563B (en) | 2015-05-13 |
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