CN102416940A - Hydraulic control system and engineering machine - Google Patents
Hydraulic control system and engineering machine Download PDFInfo
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- CN102416940A CN102416940A CN2011103122914A CN201110312291A CN102416940A CN 102416940 A CN102416940 A CN 102416940A CN 2011103122914 A CN2011103122914 A CN 2011103122914A CN 201110312291 A CN201110312291 A CN 201110312291A CN 102416940 A CN102416940 A CN 102416940A
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Abstract
The invention provides a hydraulic control system. The system comprises a load sensitive variable pump, a shuttle valve, a braking system and a radiating system integrated with the braking system, wherein the load sensitive variable pump is respectively connected with the braking system and the radiating system; the braking system and the radiating system are connected with the shuttle valve; and the shuttle valve is connected with a load sensitive control oil port of the load sensitive variable pump. The hydraulic control system comprises the braking system and the radiating system integrated with the braking system, so that an engineering machine can be radiated and braked simultaneously; and compared with the conventional independent braking system and radiating system, the two integrated systems have the advantages of compact structure layout and the like.
Description
Technical field
The present invention relates to a kind of hydraulic control system and use the construction machinery and equipment of this hydraulic control system.
Background technology
Especially road grader is in operation of big load or high speed transition process for construction machinery and equipment, and its hydraulic efficiency pressure system, power system can produce great amount of heat, cause the working medium temperature rise too high; And when its during in low temperature environment or little load operation common working medium temperature on the low side.The too high or too low of working medium all will have a negative impact to system.Therefore for guaranteeing power system, hydraulic work system at its optimum temperature range, to construction machinery and equipment particularly road grader be necessary to design corresponding cooling mechanism, to prevent excessive temperature differentials system is caused damage.The construction machinery and equipment of higher configured all adopts fan motor to drive usually at present, comes the control system heat-sinking capability through changing the fan motor rotating speed.
Simultaneously, construction machinery and equipment of cutting at a high speed for needs such as road grader, rough-terrain crane, loader etc. for guaranteeing its safety traffic performance, mostly need the travelling brake system.The general-duty way is through independently oil pump or air pump provide propulsion source to realize braking to brake activation valve at present.
Construction machinery and equipment such as road grader, rough-terrain crane, loader etc. that braking requirement is arranged again for existing heat radiation at present all are to adopt two systems independently of overlapping to realize the function of heat radiation and braking usually.This certainly will make the element that needs increase, and has not only increased productive costs, also makes complete machine structure arrange more and disperses.
Provide a kind of hydraulic control system that cooling system and brake system is mutually integrated to reduce production costs, become the problem of needing solution badly.
Summary of the invention
In order to overcome the above-mentioned defective and the deficiency of prior art; The object of the present invention is to provide a kind of hydraulic control system; Comprise that load-sensitive controllable capacity pump, shuttle valve, brake system reach and the mutually integrated cooling system of said brake system; Said load-sensitive controllable capacity pump is connected with said brake system and cooling system respectively, and said brake system and cooling system are connected with said shuttle valve, and said shuttle valve is connected with the load-sensitive control port of said load-sensitive controllable capacity pump.
Preferably; Said brake system comprises first damping hole, first check valve, pilot operated directional control valve, prefill valve, first pressure switch, brake accumulator, brake activation valve and drg; Said first damping hole is connected with said load-sensitive controllable capacity pump and said first check valve; Said first check valve is connected with said pilot operated directional control valve and said prefill valve, and said pilot operated directional control valve is connected with said prefill valve and said shuttle valve, and said prefill valve is connected with said first pressure switch and said brake accumulator; Said brake accumulator is connected with said brake activation valve, and said brake activation valve is connected with this drg.
Preferably, said brake system also comprises second pressure switch, and said second pressure switch is arranged on the oil circuit that connects between said brake activation valve and the said drg.
Preferably; Said cooling system comprises Solenoid ball valve, pressure difference sensing valve, second damping hole, electric proportional pressure control valve, controller, the 3rd damping hole, radiator, change-over valve, fan motor and hydraulic reservoir; Said Solenoid ball valve one end is connected with said load-sensitive controllable capacity pump; The other end is connected with said pressure difference sensing valve and said second damping hole respectively; Said second damping hole is connected with said electric proportional pressure control valve and said shuttle valve, and said electric proportional pressure control valve is connected with said shuttle valve and said controller, and said the 3rd damping hole is connected with said shuttle valve and said electric proportional pressure control valve; Said pressure difference sensing valve is connected with said fan motor and said change-over valve, and said fan motor is connected with said change-over valve and said hydraulic reservoir.
Preferably, said cooling system also comprises second check valve, and said pressure difference sensing valve is connected with said radiator through said second check valve.
Preferably, said hydraulic control system also comprises filter, and said load-sensitive controllable capacity pump is connected with said brake system and cooling system respectively through said filter.
Simultaneously, the present invention provides a kind of construction machinery and equipment of using aforesaid hydraulic control system.
This hydraulic control system comprises that this brake system reaches and the mutually integrated cooling system of this brake system, being embodied as the construction machinery and equipment heat-dissipation simultaneously, also can realize construction machinery and equipment is braked.Above-mentioned two kinds of systems integrated and existing two overlaps that independently brake system and cooling system are compared advantages such as having the topology layout compactness.
Description of drawings
The hydraulic control system hydraulic schematic diagram that provides for preferred embodiment of the present invention shown in Figure 1.
The specific embodiment
To combine the Fig. 1 in the preferred embodiment of the present invention below, the technical scheme in the embodiment of the invention will be carried out clear, intactly description.
The present invention provides a kind of hydraulic control system, and it is applied in the construction machinery and equipments such as road grader, rough-terrain crane, loader.This hydraulic control system comprises load-sensitive controllable capacity pump 1, the filter 2 that is connected with this load-sensitive controllable capacity pump 1, shuttle valve 3, brake system and and the mutually integrated cooling system of this brake system.
This load-sensitive controllable capacity pump 1 is used for the power of fan motor 22 and drg 11 is carried out adaptive control.This load-sensitive controllable capacity pump 1 has the characteristic of pressure, adaptive-flow, its exportable pressure oil that adapts with these fan motor 22 operation pressures, and then the rotation of realization fan motor 22.This load-sensitive controllable capacity pump 1 can also be exported the pressure oil that adapts with these drg 11 operation pressures, and then realizes the control of braking of 11 pairs of construction machinery and equipments of this drg.
This filter 2 is connected with this load-sensitive controllable capacity pump 1, and it is used for the solid impurities of the hydraulic oil of being exported by this load-sensitive controllable capacity pump 1 is filtered, in case each element undue wear in the solution stopping pressure-controlled system.
This shuttle valve 3 is a triple valve; It is connected with this load-sensitive controllable capacity pump 1, this brake system and this cooling system; Operation pressure in this brake system and this cooling system is fed back to the load-sensitive control port of this load-sensitive controllable capacity pump 1, make this load-sensitive controllable capacity pump 1 produce pressure and the flow that adapts to this brake system and this cooling system working phase simultaneously.
This brake system comprises first damping hole 4, first check valve 5, pilot operated directional control valve 6, prefill valve 7, first pressure switch 8, brake accumulator 9, brake activation valve 10, drg 11 and second pressure switch 12.
This first damping hole 4 is connected with this filter 2 and this first check valve 5.This first damping hole 4 is used to limit the topping up speed of this brake accumulator 9.This first check valve 5 is connected with this pilot operated directional control valve 6 and this prefill valve 7.This pilot operated directional control valve 6 is connected with this prefill valve 7 and this shuttle valve 3.This pilot operated directional control valve 6 is directional control valves of fluid control, changes the state or the flow direction of hydraulic oil through the hydraulic control mode, thereby realizes this brake accumulator 9 low pressure automatic liquid feedings.This shuttle valve 3 is connected with the load-sensitive control port of this load-sensitive controllable capacity pump 1.This prefill valve 7 is connected with this first pressure switch 8 and this brake accumulator 9.This brake accumulator 9 is connected with this brake activation valve 10.The effect of this brake accumulator 9 is storage liquid pressure energies, and when construction machinery and equipment needs glancing impact, this brake accumulator 9 hold-off pressures oil is realized braking to this drg 11.Usually, the hydraulic pressure that this brake accumulator 9 stores can be able to satisfy the needs of 3-5 braking, like this, has reduced the frequency of operation of this load-sensitive controllable capacity pump 1, even construction machinery and equipment also has actv. safety arrestment ability under situation about running out of steam simultaneously.This brake activation valve 10 is connected with this drg 11.This second pressure switch 12 is arranged on the oil circuit that connects between this brake activation valve 10 and this drg 11.
This cooling system comprises Solenoid ball valve 13, pressure difference sensing valve 14, second damping hole 15, electric proportional pressure control valve 16, controller 17, the 3rd damping hole 18, second check valve 19, radiator 20, change-over valve 21, fan motor 22 and hydraulic reservoir 23.
These Solenoid ball valve 13 1 ends are connected with this filter 2, and it is used to control the start and stop of this fan motor 22.The other end of this Solenoid ball valve 3 is connected with pressure difference sensing valve 14 and this second damping hole 15 respectively.This second damping hole 15 is connected with this electricity proportional pressure control valve 16 and this shuttle valve 3.This second damping hole 15 has the effect of throttling, and the flow that it is used to limit these fan motor 22 control oil makes through just these fan motor 22 work of may command of less hydraulic fluid flow rate.This shuttle valve 3 is connected with the load-sensitive control port of this load-sensitive controllable capacity pump 1.This electricity proportional pressure control valve 16 is connected with this shuttle valve 3 and this controller 17.This electricity proportional pressure control valve 16 is a pressure-gradient control valve, and it regulates the operation pressure of this fan motor 22 through regulating electric scaling signal, thereby realizes regulating the rotating speed of this fan motor 22.This controller 17 is used to control the magnitude of current that is delivered to this electricity proportional pressure control valve 16, and the magnitude of current that this controller 17 is carried to this electricity proportional pressure control valve 16 is big more, and the pressure in this cooling system is just more little.This controller 17 comprises hydraulic oil sensor, air charge temperature sensor and cooling-water temperature transmitter; When said sensor sensed temperature is all low; This controller 17 is carried maximum electric current to this electricity proportional pressure control valve 16; The pressure decay of this load-sensitive controllable capacity pump 1 output hydraulic oil, and then the oil pressure of the hydraulic oil that flows into to this fan motor 22 is reduced, thus the rotating speed of this fan motor 22 is reduced; Vice versa.The 3rd damping hole 18 is with this shuttle valve 3 and should be connected by electricity proportional pressure control valve 16.The effect that the 3rd damping hole 18 has buffering, it is used to reduce the sudden change of these pressure difference sensing valve 14 spool apertures, and then reduces the impact of hydraulic oil to this fan motor 22.This pressure difference sensing valve 14 is connected with this second check valve 19 and change-over valve 21.This pressure difference sensing valve 14 is an open type logical valve, its control presssure through comparing load pressure and feeding back through the 3rd damping hole 18, the aperture of these pressure difference sensing valve 14 spools of dynamic adjustments.When this brake accumulator 9 needs supercharging pressure higher than these fan motor 22 operation pressures; Hydraulic oil between this first check valve 5, the prefill valve 7 arrives the load-sensitive control port of load-sensitive controllable capacity pump 1 through pilot operated directional control valve 6, shuttle valve 3; Make load-sensitive controllable capacity pump 1 set up the output supercharging pressure that this brake accumulator 9 needs; At this moment, these pressure difference sensing valve 14 spool apertures reduce, and preferentially guarantee supercharging pressure.This second check valve 19 is connected with this radiator 20, and this second check valve 19 can play the effect that when this fan motor 22 hypervelocities or stall, prevents cavitation.This radiator 20 is connected with this change-over valve 21 and this hydraulic reservoir 23.
When the supercharging pressure in the prefill valve 7 was not enough, this first pressure switch 8 was sent low pressure alarming.This load-sensitive controllable capacity pump 1 output hydraulic oil flow gets into this brake accumulator 9 so that this brake accumulator 9 is carried out topping up at last through this filter 2, first damping hole 4, first check valve 5 and prefill valve 7.Simultaneously; Hydraulic oil between this first check valve 5 and the prefill valve 7 arrives the load-sensitive control port of load-sensitive controllable capacity pumps 1 through this pilot operated directional control valve 6 and this shuttle valve 3, makes operation pressure and the flow that 1 generation of load-sensitive controllable capacity pump and brake system adapt.This load-sensitive controllable capacity pump 1 is exported another part hydraulic oil simultaneously; This hydraulic oil flow is through this filter 2, Solenoid ball valve 13, pressure difference sensing valve 14 and change-over valve 21; Flow into this fan motor 22 and drive fan at last and be rotated, so that construction machinery and equipment is carried out radiating treatment.
Supercharging pressure in this prefill valve 7 reaches going up in limited time of setting, promptly be full of hydraulic oil in this brake accumulator 9 after, this prefill valve 7 is cut to the oil circuit of this brake accumulator 9.Simultaneously, this pilot operated directional control valve 6 switches to closed condition.The hydraulic oil of the load-sensitive control port of this load-sensitive controllable capacity pump 1 is discharged in the fuel tank to pilot operated directional control valve 6 through this shuttle valve 3.At this moment, a part of hydraulic oil of this load-sensitive controllable capacity pump 1 output arrives these pilot operated directional control valves 6 and this prefill valve 7 through this filter 2, first damping hole 4 and first check valve 5 and is ended.Meanwhile, another part hydraulic oil of this load-sensitive controllable capacity pump 1 output drives this fan motor 22 through this filter 2, Solenoid ball valve 13, pressure difference sensing valve 14, change-over valve 21 and carries out work, so that construction machinery and equipment is carried out radiating treatment.Another part hydraulic oil of this load-sensitive controllable capacity pump 1 output is oily as control through the hydraulic oil of this filter 2, Solenoid ball valve 13, second damping hole, 15 shunting smaller portions, and this control oil reaches the load-sensitive control port of this load-sensitive controllable capacity pump 1 through this shuttle valve 3.This electricity proportional pressure control valve 16 is regulated the oil pressure of this control oil, makes this load-sensitive controllable capacity pump 1 produce operation pressure and the flow that adapts with this fan motor 22.
When needs carry out glancing impact to construction machinery and equipment, chaufeur can be stepped on this brake activation valve 10 makes the pressure oil in this brake accumulator 9 arrive in the said drg 11 so that construction machinery and equipment is braked.Simultaneously, this second pressure switch 12 is sent signal and is braked warning.After accomplishing braking, said brake activation valve 10 is released, and the hydraulic oil in the said drg 11 refluxes through said brake activation valve 10, in the fuel tank that said hydraulic oil flows into said brake activation valve 10 links to each other.At this moment, removed the braking to construction machinery and equipment, simultaneously, this second pressure switch 12 is closed, thereby brake off is reported to the police.
Be appreciated that this filter 2 and this second check valve 19 can save, therefore, this load-sensitive controllable capacity pump 1 directly is connected with this brake system and cooling system respectively; This pressure difference sensing valve 14 directly is connected with this fan motor 22, this radiator 20 and this change-over valve 21.
This hydraulic control system comprises that this brake system reaches and the mutually integrated cooling system of this brake system, being embodied as the construction machinery and equipment heat-dissipation simultaneously, also can realize construction machinery and equipment is braked.Above-mentioned two kinds of systems integrated and existing two overlaps that independently brake system and cooling system are compared advantages such as having the topology layout compactness.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. hydraulic control system; It is characterized in that: comprise that load-sensitive controllable capacity pump (1), shuttle valve (3), brake system reach and the mutually integrated cooling system of said brake system; Said load-sensitive controllable capacity pump (1) is connected with said brake system and cooling system respectively; Said brake system and cooling system are connected with said shuttle valve (3), and said shuttle valve (3) is connected with the load-sensitive control port of said load-sensitive controllable capacity pump (1).
2. hydraulic control system according to claim 1; It is characterized in that: said brake system comprises first damping hole (4), first check valve (5), pilot operated directional control valve (6), prefill valve (7), first pressure switch (8), brake accumulator (9), brake activation valve (10) and drg (11); Said first damping hole (4) is connected with said load-sensitive controllable capacity pump (1) and said first check valve (5); Said first check valve (5) is connected with said pilot operated directional control valve (6) and said prefill valve (7); Said pilot operated directional control valve (6) is connected with said prefill valve (7) and said shuttle valve (3); Said prefill valve (7) is connected with said first pressure switch (8) and said brake accumulator (9), and said brake accumulator (9) is connected with said brake activation valve (10), and said brake activation valve (10) is connected with this drg (11).
3. hydraulic control system according to claim 2 is characterized in that: said brake system also comprises second pressure switch (12), and said second pressure switch (12) is arranged on the oil circuit that connects between said brake activation valve (10) and the said drg (11).
4. according to claim 2 or 3 described hydraulic control systems; It is characterized in that: said cooling system comprises Solenoid ball valve (13), pressure difference sensing valve (14), second damping hole (15), electric proportional pressure control valve (16), controller (17), the 3rd damping hole (18), radiator (20), change-over valve (21), fan motor (22) and hydraulic reservoir (23); Said Solenoid ball valve (13) one ends are connected with said load-sensitive controllable capacity pump (1); The other end is connected with said pressure difference sensing valve (14) and said second damping hole (15) respectively; Said second damping hole (15) is connected with said electric proportional pressure control valve (16) and said shuttle valve (3); Said electric proportional pressure control valve (16) is connected with said shuttle valve (3) and said controller (17); Said the 3rd damping hole (18) is connected with said shuttle valve (3) and said electric proportional pressure control valve (16); Said pressure difference sensing valve (14) is connected with said fan motor (22) and said change-over valve (21), and said fan motor (22) is connected with said change-over valve (21) and said hydraulic reservoir (23).
5. hydraulic control system according to claim 4 is characterized in that: said cooling system also comprises second check valve (19), and said pressure difference sensing valve (14) is connected with said radiator (20) through said second check valve (19).
6. hydraulic control system according to claim 1 is characterized in that: said hydraulic control system also comprises filter (2), and said load-sensitive controllable capacity pump (1) is connected with said brake system and cooling system respectively through said filter (2).
7. construction machinery and equipment, it comprises hydraulic control system, it is characterized in that, said hydraulic control system is each described hydraulic control system among the claim 1-6.
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| CN2011103122914A CN102416940A (en) | 2011-10-14 | 2011-10-14 | Hydraulic control system and engineering machine |
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| CN2011103122914A CN102416940A (en) | 2011-10-14 | 2011-10-14 | Hydraulic control system and engineering machine |
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| CN102416940A true CN102416940A (en) | 2012-04-18 |
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| CN2011103122914A Pending CN102416940A (en) | 2011-10-14 | 2011-10-14 | Hydraulic control system and engineering machine |
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| CN102785652A (en) * | 2012-08-17 | 2012-11-21 | 徐州徐工铁路装备有限公司 | Integrated control system of wheel type engineering machine |
| CN102927087A (en) * | 2012-11-16 | 2013-02-13 | 无锡汇虹机械制造有限公司 | Control technology for hydraulic pump system self-adaptive to loading pressure |
| CN102927086A (en) * | 2012-11-16 | 2013-02-13 | 无锡汇虹机械制造有限公司 | Flow control method for load-sensitive variable pump of hydraulic system |
| CN103114989A (en) * | 2013-01-28 | 2013-05-22 | 上海朝田实业有限公司 | Follow-up sensitive pump for energy-saving hydraulic pump station |
| CN103171541A (en) * | 2013-03-22 | 2013-06-26 | 广西柳工机械股份有限公司 | Load sensing heat dissipation braking variable system of loading machine |
| CN103264691A (en) * | 2013-05-31 | 2013-08-28 | 安徽合力股份有限公司 | Brake system of empty container forklift |
| CN103802809A (en) * | 2012-11-08 | 2014-05-21 | 秦皇岛天业通联重工股份有限公司 | Brake control system of mining dump truck and mining dump truck |
| CN104863911A (en) * | 2015-05-26 | 2015-08-26 | 天津捷强动力装备有限公司 | Hydraulic circuit used for controlling no-load rotation speed of hydraulic motor to be stable through load-sensitive variable pump |
| CN104960513A (en) * | 2015-05-29 | 2015-10-07 | 徐工集团工程机械股份有限公司科技分公司 | Full hydraulic braking and fan driving system |
| CN105626121A (en) * | 2016-01-05 | 2016-06-01 | 中国矿业大学 | Hydraulic synchronous control system of tunnel temporary supporting bracket and control method of hydraulic synchronous control system |
| CN105774784A (en) * | 2014-12-22 | 2016-07-20 | 中冶宝钢技术服务有限公司 | Full-hydraulic braking system used for tank truck and tank truck |
| CN107630847A (en) * | 2017-09-15 | 2018-01-26 | 太原理工大学 | Electric ratio pressure continuously regulates and controls hydraulic motor/pump |
| CN110001614A (en) * | 2019-04-14 | 2019-07-12 | 湖南鹏翔星通汽车有限公司 | Protect system in a kind of wet sprayer hydraulic control chassis |
| CN110594349A (en) * | 2019-09-20 | 2019-12-20 | 三一汽车制造有限公司 | Suspension hydraulic system and vehicle |
| CN111637118A (en) * | 2020-05-09 | 2020-09-08 | 中联重科股份有限公司 | Walking type engineering machinery hydraulic cooling system and hydrostatic bulldozer |
| CN112012969A (en) * | 2020-08-27 | 2020-12-01 | 广西柳工机械股份有限公司 | Hydraulic system and loader |
| CN112334669A (en) * | 2019-03-28 | 2021-02-05 | 日立建机株式会社 | Construction machine |
| EP3800096A1 (en) * | 2019-10-04 | 2021-04-07 | Kabushiki Kaisha Toyota Jidoshokki | Hydraulic system of industrial vehicle |
| CN113915262A (en) * | 2021-10-27 | 2022-01-11 | 徐工集团工程机械股份有限公司科技分公司 | Novel braking and fan driving system and driving method |
| US11572669B2 (en) | 2019-07-03 | 2023-02-07 | Caterpillar Inc. | Circle drive control system for a grading machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102785652A (en) * | 2012-08-17 | 2012-11-21 | 徐州徐工铁路装备有限公司 | Integrated control system of wheel type engineering machine |
| CN102785652B (en) * | 2012-08-17 | 2014-07-16 | 徐州徐工铁路装备有限公司 | Integrated control system of wheel type engineering machine |
| CN103802809A (en) * | 2012-11-08 | 2014-05-21 | 秦皇岛天业通联重工股份有限公司 | Brake control system of mining dump truck and mining dump truck |
| CN102927087A (en) * | 2012-11-16 | 2013-02-13 | 无锡汇虹机械制造有限公司 | Control technology for hydraulic pump system self-adaptive to loading pressure |
| CN102927086A (en) * | 2012-11-16 | 2013-02-13 | 无锡汇虹机械制造有限公司 | Flow control method for load-sensitive variable pump of hydraulic system |
| CN103114989A (en) * | 2013-01-28 | 2013-05-22 | 上海朝田实业有限公司 | Follow-up sensitive pump for energy-saving hydraulic pump station |
| CN103171541A (en) * | 2013-03-22 | 2013-06-26 | 广西柳工机械股份有限公司 | Load sensing heat dissipation braking variable system of loading machine |
| CN103171541B (en) * | 2013-03-22 | 2015-07-22 | 广西柳工机械股份有限公司 | Load sensing heat dissipation braking variable system of loading machine |
| CN103264691A (en) * | 2013-05-31 | 2013-08-28 | 安徽合力股份有限公司 | Brake system of empty container forklift |
| CN105774784A (en) * | 2014-12-22 | 2016-07-20 | 中冶宝钢技术服务有限公司 | Full-hydraulic braking system used for tank truck and tank truck |
| CN104863911A (en) * | 2015-05-26 | 2015-08-26 | 天津捷强动力装备有限公司 | Hydraulic circuit used for controlling no-load rotation speed of hydraulic motor to be stable through load-sensitive variable pump |
| CN104863911B (en) * | 2015-05-26 | 2017-04-19 | 天津捷强动力装备有限公司 | Hydraulic circuit used for controlling no-load rotation speed of hydraulic motor to be stable through load-sensitive variable pump |
| CN104960513B (en) * | 2015-05-29 | 2017-11-14 | 徐工集团工程机械股份有限公司科技分公司 | A kind of Full-hydraulic braking apparatus and fan drive system |
| CN104960513A (en) * | 2015-05-29 | 2015-10-07 | 徐工集团工程机械股份有限公司科技分公司 | Full hydraulic braking and fan driving system |
| CN105626121A (en) * | 2016-01-05 | 2016-06-01 | 中国矿业大学 | Hydraulic synchronous control system of tunnel temporary supporting bracket and control method of hydraulic synchronous control system |
| CN107630847A (en) * | 2017-09-15 | 2018-01-26 | 太原理工大学 | Electric ratio pressure continuously regulates and controls hydraulic motor/pump |
| CN107630847B (en) * | 2017-09-15 | 2019-04-30 | 太原理工大学 | Electric ratio pressure continuously regulates and controls hydraulic motor/pump |
| CN112334669A (en) * | 2019-03-28 | 2021-02-05 | 日立建机株式会社 | Construction machine |
| CN110001614A (en) * | 2019-04-14 | 2019-07-12 | 湖南鹏翔星通汽车有限公司 | Protect system in a kind of wet sprayer hydraulic control chassis |
| US11572669B2 (en) | 2019-07-03 | 2023-02-07 | Caterpillar Inc. | Circle drive control system for a grading machine |
| CN110594349A (en) * | 2019-09-20 | 2019-12-20 | 三一汽车制造有限公司 | Suspension hydraulic system and vehicle |
| EP3800096A1 (en) * | 2019-10-04 | 2021-04-07 | Kabushiki Kaisha Toyota Jidoshokki | Hydraulic system of industrial vehicle |
| CN111637118B (en) * | 2020-05-09 | 2022-02-01 | 中联重科股份有限公司 | Walking type engineering machinery hydraulic cooling system and hydrostatic bulldozer |
| CN111637118A (en) * | 2020-05-09 | 2020-09-08 | 中联重科股份有限公司 | Walking type engineering machinery hydraulic cooling system and hydrostatic bulldozer |
| CN112012969A (en) * | 2020-08-27 | 2020-12-01 | 广西柳工机械股份有限公司 | Hydraulic system and loader |
| CN113915262A (en) * | 2021-10-27 | 2022-01-11 | 徐工集团工程机械股份有限公司科技分公司 | Novel braking and fan driving system and driving method |
| CN113915262B (en) * | 2021-10-27 | 2024-04-09 | 徐工集团工程机械股份有限公司科技分公司 | Novel braking and fan driving system and driving method |
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Application publication date: 20120418 |