CN103738396A - Constant flow steering system and engineering machinery - Google Patents

Constant flow steering system and engineering machinery Download PDF

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Publication number
CN103738396A
CN103738396A CN201310737481.XA CN201310737481A CN103738396A CN 103738396 A CN103738396 A CN 103738396A CN 201310737481 A CN201310737481 A CN 201310737481A CN 103738396 A CN103738396 A CN 103738396A
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CN
China
Prior art keywords
valve
constant flow
oil
swivel system
steering swivel
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Pending
Application number
CN201310737481.XA
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Chinese (zh)
Inventor
邹兴龙
唐海军
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Sany Automobile Hoisting Machinery Co Ltd
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Sany Automobile Hoisting Machinery Co Ltd
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Application filed by Sany Automobile Hoisting Machinery Co Ltd filed Critical Sany Automobile Hoisting Machinery Co Ltd
Priority to CN201310737481.XA priority Critical patent/CN103738396A/en
Publication of CN103738396A publication Critical patent/CN103738396A/en
Pending legal-status Critical Current

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Abstract

The invention provides a constant flow steering system and engineering machinery. The constant flow steering system comprises a load sensitive pump, a throttling gear, a proportional directional valve and a steering oil cylinder; an oil outlet of the load sensitive pump is communicated with an oil inlet of the throttling device; an oil outlet of the throttling device is communicated with an induction opening of the load sensitive pump and an oil inlet of the proportional directional valve simultaneously; two working oil openings of the proportional directional valve are communicated with a rod chamber and a rod-free chamber of the steering oil cylinder; a return opening of the proportional directional valve is connected with an oil tank. According to the constant flow steering system, pressure oil is provided for the steering system through the load sensitive pump and output flow of the steering system is set through the throttling device, so that the amount of output flow can be decided according to the requirement of the steering system, energy resource is saved furthest, and the heat quantity of a hydraulic system is reduced.

Description

A kind of constant flow steering swivel system and construction machinery and equipment
Technical field
The present invention relates to hydraulic technique field, particularly a kind of constant flow steering swivel system and construction machinery and equipment.
Background technology
In current hydrostatic steering system, be to adopt various flow-controlling gates to control the flow of oil pump output mostly, make to arrive the flow substantially constant of steering cylinder, and then guarantee that the stable working state of steering cylinder is reliable.But the output of oil pump is along with the rotation speed change of driving engine changes, it is multiple relation that the flow that the low-speed running of driving engine and high-speed operation are exported differs, so, in valve control system, although by flow valve, make to arrive the flow substantially constant of steering cylinder, when high engine speeds turns round, the output of oil pump is always in overflow situation, cal val is large, and energy consumption is high, and the high oil temperature continuing is also very large to the loss of the each element of hydraulic efficiency pressure system.
Summary of the invention
In view of this, the present invention is intended to propose a kind of constant flow steering swivel system and construction machinery and equipment, keeps constant, and can save to greatest extent the energy so that arrive the flow of steering cylinder, reduces the cal val of hydraulic efficiency pressure system.
For achieving the above object, technical scheme of the present invention is achieved in that
On the one hand, the invention provides a kind of constant flow steering swivel system, comprise load sensitive pump, throttling device, proportional reversing valve and steering cylinder, the oil outlet of described load sensitive pump is communicated with the oil inlet of described throttling device, the oil outlet of described throttling device is communicated with the induction mouth of described load sensitive pump and the oil inlet of proportional reversing valve simultaneously, two actuator ports of described proportional reversing valve are communicated with rod chamber, the rodless cavity of described steering cylinder respectively, and the return opening of described proportional reversing valve connects fuel tank.
Further, also comprise that low-angle turns to auxiliary oil way, described low-angle turns to auxiliary oil way to comprise switch valve, energy storage and pressure sensor, described switch valve is arranged on described throttling device to the oil circuit of described proportional reversing valve, described energy storage is other is connected on described switch valve to the oil circuit of described proportional reversing valve, and described pressure sensor is for detection of the pressure of described energy storage.
Further, also comprise safety overflow valve, described safety overflow valve is other is connected on described throttling device to the oil circuit of described switch valve.
Further, also comprise unloader valve, described unloader valve is other is connected on described throttling device to the oil circuit of described switch valve.
Further, also comprise the oil filter that is arranged on described load sensitive pump oil outlet.
Further, also comprise the other compression indicator that is connected on described load sensitive pump oil outlet.
Further, described throttling device is adjustable flow bean or fixing damping.
Further, described adjustable flow bean comprises flow regulating valve or adjustable damping.
Further, described proportional reversing valve and/or switch valve are electromagnetic valve, pilot operated valve device or pneumatic valve.
On the other hand, the present invention also provides a kind of construction machinery and equipment, and described construction machinery and equipment is provided with constant flow steering swivel system as above.
With respect to prior art, the present invention has following advantage:
1, constant flow steering swivel system of the present invention adopts load sensitive pump to provide pressure oil to steering swivel system, its delivery rate is set by throttling device, thereby can realize how many flows of steering swivel system needs, just exports how many flows, save to greatest extent the energy, reduce Hydraulic System Fever amount.
2, constant flow steering swivel system of the present invention is also provided with low-angle and turns to auxiliary oil way, by energy storage, pressure sensor and proportional reversing valve, form low-angle and turn to closed loop feedback system, energy storage pressure can maintain steering pressure, without load-sensitive oil pump feed, when pressure is low to moderate after setting value, then by load-sensitive oil pump feed, hydraulic system structure is simple, cost is lower, easy to maintenance, and energy-conserving and environment-protective.
3, the hydraulic system structure of constant flow steering swivel system of the present invention is simple, only by a throttling device, can realize constant flow output, and the large I of delivery rate is regulated by the actual demand of load, and system maintenance easy, cost are lower.
Accompanying drawing explanation
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the hydraulic schematic diagram of constant flow steering swivel system described in the embodiment of the present invention.
Description of reference numerals:
1-load sensitive pump, 2-oil filter, 3-compression indicator, 4-adjustable flow bean, 5-energy storage, 6-switch valve, 7-proportional reversing valve, 8-safety overflow valve, 9-unloader valve, 10-steering cylinder, 11-pressure sensor.
The specific embodiment
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the present invention can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Fig. 1 is the hydraulic schematic diagram of constant flow steering swivel system described in the present embodiment, as shown in FIG., this constant flow steering swivel system comprises load sensitive pump 1, adjustable flow bean 4, proportional reversing valve 7 and steering cylinder 10, also comprises switch valve 6, energy storage 5, pressure sensor 11, safety overflow valve 8, unloader valve 9, oil filter 2 and compression indicator 3.
The oil outlet of this load sensitive pump 1 is communicated with the oil inlet of adjustable flow bean 4, and oil filter 2 is arranged on the oil outlet place of load sensitive pump 1, the other oil outlet place that is connected on load sensitive pump 1 of compression indicator 3.The oil outlet of this adjustable flow bean 4 is communicated with the oil inlet of switch valve 6 and the LS mouth of load sensitive pump 1 (i.e. induction mouthful) simultaneously, and this safety overflow valve 8 and unloader valve 9 are all other is connected on adjustable flow bean 4 to the oil circuit of switch valve 6.The oil outlet of this switch valve 6 is communicated with the oil inlet of proportional reversing valve 7, these energy storage 5 sides are connected on switch valve 6 to the oil circuit of proportional reversing valve 7, pressure sensor 11 is for detection of the pressure of energy storage 5, and this switch valve 6, energy storage 5 and pressure sensor 11 jointly form low-angle and turn to auxiliary oil way together with proportional reversing valve 7.Pressure sensor 11 feeds back to pressure signal the controller of system, and controller is according to the keying of pressure signal master cock valve 6, and then opens or close low-angle auxiliary oil way.Two actuator ports of this proportional reversing valve 7 are communicated with rod chamber, the rodless cavity of steering cylinder 10 respectively, and the return opening of proportional reversing valve 7 takes back fuel tank.
The present embodiment is to adopt load sensitive pump 1+ adjustable flow bean 4+ proportional reversing valve 7 to control steering cylinder 10, by setting the aperture area size of this adjustable flow bean 4, make the difference of the delivery pressure of load sensitive pump 1 and the real-time pressure of the load that LS mouth detects be always the needed a certain steady state value of steering swivel system (this steady state value is determined according to the each design parameter of steering swivel system), when the delivery rate of load sensitive pump 1 raises because of the rotating speed of driving engine, its delivery pressure must raise, therefore the pressure reduction at adjustable flow bean 4 two ends increases, this pressure reduction can feed back to LS mouth, thereby promote the stroking mechanism of load sensitive pump 1, its discharge capacity is reduced, and then it is constant to realize its delivery rate maintenance, make the output of load sensitive pump 1 irrelevant with the rotating speed of driving engine, thereby avoided traditional steering swivel system flow to increase with the increase of the speed of a motor vehicle, the huge waste causing.Switch valve 6, energy storage 5 and pressure sensor 11 constitute low-angle and turn to auxiliary oil way, when steering swivel system low-angle turns to, do not need load sensitive pump 1 fuel feeding, only by energy storage 5, can meet it and turn to requirement, and be less than after a certain setting value when energy storage 5 pressure, switch valve 6 is opened, then by load sensitive pump 1 fuel feeding.Unloader valve 9 is constant flow steering swivel system builds pressure valve, and after it is opened, system could build-up pressure, and when system standby does not need to build while pressing, unloader valve 9 is closed, main system off-load, thus reach energy-conservation object.
With respect to prior art, the present embodiment has following advantage:
1, adopt load sensitive pump to provide pressure oil to steering swivel system, its delivery rate is set by throttling device, thereby can realize how many flows of steering swivel system needs, just exports how many flows, saves to greatest extent the energy, reduces Hydraulic System Fever amount.
2, be also provided with low-angle and turn to auxiliary oil way, by energy storage, pressure sensor and proportional reversing valve, form low-angle and turn to closed loop feedback system, energy storage pressure can maintain steering pressure, without load-sensitive oil pump feed, when pressure is low to moderate after setting value, then by load-sensitive oil pump feed, hydraulic system structure is simple, cost is lower, easy to maintenance, and energy-conserving and environment-protective.
3, hydraulic system structure is simple, only by a throttling device, can realize constant flow output, and the large I of delivery rate is regulated by the actual demand of load, and system maintenance easy, cost are lower.
Adjustable flow bean described in the present embodiment can be flow regulating valve, also can be adjustable damping, in other embodiments, this adjustable flow bean can also be other throttling devices such as fixing damping, and the mode of this change-over valve, switch valve and unloader valve can be electromagnetic control, fluid control or air operated control.
Except above-mentioned constant flow steering swivel system, the embodiment of the present invention also provides one to be provided with above-mentioned constant flow steering swivel system construction machinery and equipment, and the structure of other each several part of this project machinery, with reference to prior art, repeats no more herein.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. a constant flow steering swivel system, it is characterized in that, comprise load sensitive pump (1), throttling device, proportional reversing valve (7) and steering cylinder (10), the oil outlet of described load sensitive pump (1) is communicated with the oil inlet of described throttling device, the oil outlet of described throttling device is communicated with the induction mouth of described load sensitive pump (1) and the oil inlet of proportional reversing valve (7) simultaneously, two actuator ports of described proportional reversing valve (7) respectively with the rod chamber of described steering cylinder (10), rodless cavity is communicated with, the return opening of described proportional reversing valve (7) connects fuel tank.
2. constant flow steering swivel system according to claim 1, it is characterized in that, also comprise that low-angle turns to auxiliary oil way, described low-angle turns to auxiliary oil way to comprise switch valve (6), energy storage (5) and pressure sensor (11), described switch valve (6) is arranged on described throttling device to the oil circuit of described proportional reversing valve (7), the other described switch valve (6) that is connected on of described energy storage (5) is to the oil circuit of described proportional reversing valve (7), and described pressure sensor (11) is for detection of the pressure of described energy storage (5).
3. constant flow steering swivel system according to claim 2, is characterized in that, also comprises safety overflow valve (8), and described safety overflow valve (8) is other is connected on described throttling device to the oil circuit of described switch valve (6).
4. constant flow steering swivel system according to claim 3, is characterized in that, also comprises unloader valve (9), and described unloader valve (9) is other is connected on described throttling device to the oil circuit of described switch valve (6).
5. constant flow steering swivel system according to claim 1, is characterized in that, also comprises the oil filter (2) that is arranged on described load sensitive pump (1) oil outlet.
6. constant flow steering swivel system according to claim 1, is characterized in that, also comprises the other compression indicator (3) that is connected on described load sensitive pump (1) oil outlet.
7. according to the constant flow steering swivel system described in claim 1 to 6 any one, it is characterized in that, described throttling device is adjustable flow bean (4) or fixing damping.
8. constant flow steering swivel system according to claim 7, is characterized in that, described adjustable flow bean (4) comprises flow regulating valve or adjustable damping.
9. constant flow steering swivel system according to claim 8, is characterized in that, described proportional reversing valve (7) and/or switch valve (6) are electromagnetic valve, pilot operated valve device or pneumatic valve.
10. a construction machinery and equipment, is characterized in that, described construction machinery and equipment is provided with the constant flow steering swivel system as described in claim 1 to 9 any one.
CN201310737481.XA 2013-12-27 2013-12-27 Constant flow steering system and engineering machinery Pending CN103738396A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104712617A (en) * 2015-03-18 2015-06-17 浙江志高机械有限公司 Full-hydraulic delay system and method
CN106762595A (en) * 2017-02-27 2017-05-31 江苏恒立液压科技有限公司 Load sensitive pump pilot system
CN109591886A (en) * 2018-11-30 2019-04-09 三汽车起重机械有限公司 Vehicle assist steering system and automatic driving vehicle
CN109654079A (en) * 2017-10-12 2019-04-19 华东交通大学 The outlet throttling load port separate control valves that full switch valve group is closed
CN112334669A (en) * 2019-03-28 2021-02-05 日立建机株式会社 Construction machine
CN108082278B (en) * 2017-11-22 2024-04-05 徐州徐工矿山机械有限公司 Mechanical transmission hinged auxiliary steering hydraulic system of dumper

Citations (6)

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Publication number Priority date Publication date Assignee Title
DE4421852A1 (en) * 1994-06-22 1996-01-04 Zahnradfabrik Friedrichshafen Power supply for hydraulic drive esp. of automobile-power steering
CN201800764U (en) * 2010-08-18 2011-04-20 内蒙古北方重型汽车股份有限公司 Steering control system of heavy duty mine dump truck
CN201858206U (en) * 2010-09-15 2011-06-08 三一重型装备有限公司 Dynamic hydraulic system of anchor rod
CN102261351A (en) * 2010-05-24 2011-11-30 上海三一科技有限公司 Simple proportional load sensitive hydraulic system
CN102363432A (en) * 2011-06-30 2012-02-29 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 Steering control device for electric wheel mining dump trucks
CN202294268U (en) * 2011-10-26 2012-07-04 十堰市驰田汽车有限公司 Hydraulic retarder and safe power steering device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4421852A1 (en) * 1994-06-22 1996-01-04 Zahnradfabrik Friedrichshafen Power supply for hydraulic drive esp. of automobile-power steering
CN102261351A (en) * 2010-05-24 2011-11-30 上海三一科技有限公司 Simple proportional load sensitive hydraulic system
CN201800764U (en) * 2010-08-18 2011-04-20 内蒙古北方重型汽车股份有限公司 Steering control system of heavy duty mine dump truck
CN201858206U (en) * 2010-09-15 2011-06-08 三一重型装备有限公司 Dynamic hydraulic system of anchor rod
CN102363432A (en) * 2011-06-30 2012-02-29 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 Steering control device for electric wheel mining dump trucks
CN202294268U (en) * 2011-10-26 2012-07-04 十堰市驰田汽车有限公司 Hydraulic retarder and safe power steering device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104712617A (en) * 2015-03-18 2015-06-17 浙江志高机械有限公司 Full-hydraulic delay system and method
CN106762595A (en) * 2017-02-27 2017-05-31 江苏恒立液压科技有限公司 Load sensitive pump pilot system
CN106762595B (en) * 2017-02-27 2019-03-05 江苏恒立液压科技有限公司 Load sensitive pump pilot system
CN109654079A (en) * 2017-10-12 2019-04-19 华东交通大学 The outlet throttling load port separate control valves that full switch valve group is closed
CN109654079B (en) * 2017-10-12 2024-02-20 华东交通大学 Full-switch valve combined outlet throttle load port independent control valve
CN108082278B (en) * 2017-11-22 2024-04-05 徐州徐工矿山机械有限公司 Mechanical transmission hinged auxiliary steering hydraulic system of dumper
CN109591886A (en) * 2018-11-30 2019-04-09 三汽车起重机械有限公司 Vehicle assist steering system and automatic driving vehicle
CN112334669A (en) * 2019-03-28 2021-02-05 日立建机株式会社 Construction machine
CN112334669B (en) * 2019-03-28 2022-11-29 日立建机株式会社 Construction machine

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Application publication date: 20140423