CN103174704A - Hydraulic oil filtration system and hydraulic shovel - Google Patents
Hydraulic oil filtration system and hydraulic shovel Download PDFInfo
- Publication number
- CN103174704A CN103174704A CN201310106361XA CN201310106361A CN103174704A CN 103174704 A CN103174704 A CN 103174704A CN 201310106361X A CN201310106361X A CN 201310106361XA CN 201310106361 A CN201310106361 A CN 201310106361A CN 103174704 A CN103174704 A CN 103174704A
- Authority
- CN
- China
- Prior art keywords
- bypass
- hydraulic
- oil
- hydraulic oil
- oil circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic oil filtration system and a hydraulic shovel. The hydraulic oil filtration system comprises a pilot control system and a bypass filtration oil way, wherein the pilot control system is used for guiding and controlling a hydraulic working device (200), the bypass filtration oil way is provided with a bypass filter (3), a pilot pump (1) is placed inside the pilot control system, an oil suction of the pilot pump (1) is connected with a hydraulic oil tank (100), one end of the bypass filtration oil way is connected with the hydraulic oil tank (100), and the other end of bypass oil way is connected on a pilot control oil way between the pilot pump (1) and the hydraulic working device (200). Due to the fact that the bypass filtration oil way is provided with the bypass filter and is connected on the pilot control oil way and the hydraulic oil tank, high-precision and high-efficiency filtration is carried out on hydraulic oil by utilizing of a flow rate and oil pressure of the hydraulic oil on the pilot control oil way, working efficiency is improved, and the structure is simple and stable.
Description
Technical field
The invention belongs to the hydraulic shovel field, particularly, relate to a kind of hydraulic oil filtering system of hydraulic shovel.
Background technique
In the hydraulic system of excavator, the fault that is caused by hydraulic oil pollution has accounted for majority.In order to control the turbidity test of hydraulic oil, except taking conventional filtrating equipment, the mode by installing bypass strainer additional can reduce fault ratio of hydraulic pressure system hydraulic oil is carried out the higher filtration of precision, improves whole aircraft reliability.
The use of bypass strainer on digging machine at present has two kinds of methods, a kind of method is the self-powered system of bypass strainer (for example motor), as shown in Figure 1, form the bypass filtration circuit by motor 2, pump 3, bypass strainer 4 and one-way valve 5, thereby the hydraulic oil in hydraulic oil container is carried out independently circulating filtration, this bypass filtration circuit and excavator hydraulic system loop 1 are separate, mutual noninterference.Like this, the bypass filtration circuit can carry out independence and the higher filtration of precision to the hydraulic oil in hydraulic oil container.This filter method efficient is high, can not produce excavator hydraulic system and disturb, yet due to needs extra power element, increased new noise source, and element is more, and installation volume is bigger than normal, causes installation difficulty and cost high, thereby use more and adopt on the super sized type excavator, be not suitable for common excavator or medium-and-large-sized excavator.
Another kind method is that bypass strainer is arranged on the main oil circuit of system, and is in parallel with radiator and conventional return filter.As shown in Figure 2, be in the patent of CN202391872U at notification number, hydraulic oil superfinishing microfiltration system in a kind of hydraulic shovel is disclosed, its principle is: the return opening of system's main valve 1 is to arranging two-way drainback passage in parallel between hydraulic oil container 2, and wherein one the tunnel is that return opening from system's main valve 1 is to the back pressure one-way valve 3 that sets gradually between hydraulic oil container 2, radiator 4 and return filter 5; Another road is to throttling joint 6 and the bypass superfinishing micro-filter 7 of series connection successively between hydraulic oil container 2 from the return opening of system's main valve 1.This method can reduce costs, noise free, can satisfy the installation requirement of general medium-and-large-sized excavator, shortcoming is due to the employing parallel way, relies on system oil return pressure as power, hydraulic oil to be introduced bypass strainer and filters, and this return pressure is less and unstable, and bypass strainer is higher due to filter precision, back pressure is large, thus when causing normally using the flow by bypass strainer very little be even zero, thereby make the efficient of bypass strainer very low.
Summary of the invention
The purpose of this invention is to provide a kind of hydraulic shovel and hydraulic oil filtering system thereof, effectively to complete the high-precision filtration of system liquid force feed and to improve filter efficiency.
To achieve these goals, the invention provides a kind of hydraulic oil filtering system, described hydraulic oil filtering system comprises for the pilot control system of pilot control hydraulic work device and the bypass that is provided with bypass strainer filters oil circuit, be provided with pioneer pump in described pilot control system, the inlet port of this pioneer pump is connected with described hydraulic oil container, the end that described bypass is filtered oil circuit connects described hydraulic oil container, and the other end connects the oil outlet of described pioneer pump to obtain oil sources from described pioneer pump.
Preferably, described pilot control system comprises the pilot control oil circuit that is connected between described pioneer pump and described hydraulic work device, the described the other end that described bypass is filtered oil circuit connects described pilot control oil circuit, to be connected with described pioneer pump by described pilot control oil circuit.
Preferably, described bypass is filtered in oil circuit and is provided with the series flow control valve of connecting with described bypass strainer, and the filler opening of this series flow control valve connects described pilot control oil circuit, and oil outlet connects described bypass strainer.
Preferably, described bypass strainer is the hydraulic oil filter that filter precision is not more than 1 μ m.
Preferably, described bypass is filtered in oil circuit and is provided with the relief valve in parallel with described bypass strainer.
Preferably, described bypass is filtered in oil circuit and is provided with the first bypass one-way valve in parallel with described bypass strainer.
Preferably, described hydraulic oil filtering system comprises that also oil outlet from described hydraulic work device to the main oil circuit described hydraulic oil container, is provided with return filter in this main oil circuit.
Preferably, the filter precision of described return filter is less than the filter precision of described bypass strainer.
Preferably, also be provided with back pressure one-way valve and the cooler of connecting with described return filter on described main oil circuit.
Preferably, also be provided with the second bypass one-way valve in parallel with described back pressure one-way valve and cooler on described main oil circuit, and the three bypass one-way valve in parallel with described return filter.
On the basis of technique scheme, the present invention also provides a kind of hydraulic shovel, has the hydraulic oil filtering system above-mentioned according to the present invention in this hydraulic shovel.
Pass through technique scheme, in hydraulic oil filtering according to the present invention system, filter oil circuit by the bypass that is provided with bypass strainer, and this bypass filtration oil circuit is connected respectively on pilot control oil circuit and hydraulic oil container, thereby can utilize hydraulic oil flow velocity and oil pressure on the pilot control oil circuit that hydraulic oil is carried out highi degree of accuracy and filters efficiently, and system consist of simple, stable.
Other features and advantages of the present invention will partly be described in detail in embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and consists of the part of specification, is used from explanation the present invention with following embodiment one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the hydraulic principle schematic diagram according to a kind of hydraulic oil filtering system of prior art, bypass strainer wherein self-powered system;
Fig. 2 is that bypass strainer wherein is arranged on main oil circuit according to the hydraulic principle schematic diagram of the another kind of hydraulic oil filtering system of prior art; And
Fig. 3 is the hydraulic principle schematic diagram according to a kind of hydraulic oil filtering system of the preferred embodiment of the present invention.
Description of reference numerals
1 pioneer pump 2 series flow control valves
3 bypass strainer 4 relief valves
5 back pressure one-way valve 6 coolers
7 return filter 8 second bypass one-way valves
9 the 3rd bypass one-way valves
100 hydraulic oil container 200 hydraulic work devices
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.
In the present invention, in the situation that do opposite explanation, the noun of locality of use as " upper and lower " normally for direction shown in the drawings or for vertically, each parts mutual alignment relationship description word on vertical or gravitational direction.The noun of locality " left and right " is normally for shown in the drawings horizontal.
As shown in Figure 3, the invention provides a kind of hydraulic oil filtering system, the hydraulic oil filtering system comprises the bypass filtration oil circuit that is provided with bypass strainer 3 and the pilot control system that is used for pilot control hydraulic work device 200, and this bypass is filtered oil circuit and is connected between the pilot control oil circuit and hydraulic oil container 100 of pilot control system.As total inventive concept, in the prior art with the hydraulic oil filter generality be arranged in system works oil return circuit or independent oil path, hydraulic oil filtering of the present invention system filters oil circuit by the bypass that will be provided with bypass strainer 3 and is arranged between pilot control oil circuit and fuel tank, to utilize the oil pressure in the pilot control oil circuit to provide power as bypass strainer 3, thereby need not additionally to increase power source, guarantee to flow through hydraulic oil flow velocity and the flow of bypass strainer 3 guarantee high efficiency filtration.
Particularly, referring to Fig. 3, in present embodiment take the hydraulic system of excavator as example, pilot control oil circuit wherein connects the also hydraulic work device 200 of pilot control hydraulic shovel, be provided with pioneer pump 1 in the pilot control oil circuit, the inlet port of this pioneer pump 1 is connected with hydraulic oil container 100, to extract hydraulic oil from hydraulic oil container 100.The end that bypass is filtered oil circuit is connected on the oil outlet and the pilot control oil circuit between hydraulic work device 200 of pioneer pump 1, particularly preferably directly be connected with the oil outlet of pioneer pump 1, the other end connects hydraulic oil container 100, so just can provide power for bypass strainer 3 by stable pioneer pump pressure.
Wherein, bypass is filtered in oil circuit and is provided with the series flow control valve 2 of connecting with bypass strainer 3, and the filler opening of this series flow control valve 2 connects the pilot control oil circuit, and oil outlet connects bypass strainer 3.Series flow control valve is set is on the basis of the pressure demand that ensures the pilot control oil circuit, the regulating action by series flow control valve provides stable pressure and flow for bypass strainer 3, and regulates bypass and filter hydraulic fluid flow rate and flow velocity in oil circuit.Series flow control valve herein is to have carried out combination brake switch and proporting pressure compensated and that be in series by Fixed differential reducing valve and throttle valve.Throttle valve is used for regulating the flow that passes through, Fixed differential reducing valve is the impact of auto-compensation load variations, making the pressure reduction before and after throttle valve is definite value, eliminated the impact of load variations on flow, thereby provide the liquid to be filtered force feed of regime flow and pressure for bypass strainer 3, strong anti-interference performance, reliability is high.Bypass strainer 3 herein is preferably the hydraulic oil filter that filter precision is not more than 1 μ m, and for example filter precision is the hydraulic oil filter of the special smart filtration grade of 0.5 μ m, thinks that hydraulic system provides secondary filter.
In addition, bypass is filtered in oil circuit and is provided with the relief valve in parallel with bypass strainer 34, and guaranteeing that accurate filter is not damaged by internal pressure, when the pressure of the oil outlet of series flow control valve surpassed certain threshold value, high-voltage oil liquid outwards overflowed back fuel tank by relief valve 4.Certainly, it will be appreciated by persons skilled in the art that also can to adopt the first bypass one-way valve that can form certain back pressure value herein in parallel with bypass strainer 3, to play the protective action identical with relief valve 4.
Except above-mentioned bypass is filtered oil circuit, hydraulic oil filtering of the present invention system also comprises the main oil circuit that is provided with return filter 7, and this main oil circuit is used for 100 oil returns from hydraulic work device 200 to hydraulic oil container.This main oil circuit is used for guaranteeing conventional oil return filter, carries out the filtration of the slightly poor large flow of precision.The filter precision of return filter 7 wherein should be less than the filter precision of bypass strainer 3, and for example adopting filter precision is the hydraulic oil filter of 10 μ m.
In order to set up system back pressure on main oil circuit, also be provided with back pressure one-way valve 5 and the cooler 6 of connecting with return filter 7 on this main oil circuit.Cooler 6 is generally radiator, and it is arranged in oil return circuit cooling so that hydraulic oil is carried out, and prevents that oil liquid temperature is too high.In addition, also be provided preferably with the second bypass one-way valve 8 in parallel with back pressure one-way valve 5 and cooler 6 on main oil circuit, and the three bypass one-way valve 9 in parallel with return filter 7.Protect cooler 6 by the second bypass one-way valve 8 is set, the 3rd bypass one-way valve 9 is set protects return filter 7, do not stop up main oil circuit.
On the basis of above-mentioned hydraulic oil filtering system, the present invention also provides a kind of hydraulic shovel, has the hydraulic oil filtering system above-mentioned according to the present invention in this hydraulic shovel.Thereby has efficient self-cleaning system according to the hydraulic system in hydraulic shovel of the present invention, the effective rate of fault of relieve hydraulic system.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned mode of execution; in technical conceive scope of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove in addition, each concrete technical characteristics described in above-mentioned embodiment in reconcilable situation, can make up by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between various mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. hydraulic oil filtering system, it is characterized in that, described hydraulic oil filtering system comprises for the pilot control system of pilot control hydraulic work device (200) and the bypass that is provided with bypass strainer (3) filters oil circuit, be provided with pioneer pump (1) in described pilot control system, the inlet port of this pioneer pump (1) is connected with described hydraulic oil container (100), the end that described bypass is filtered oil circuit connects described hydraulic oil container (100), and the other end connects the oil outlet of described pioneer pump (1) to obtain oil sources from described pioneer pump (1).
2. hydraulic oil filtering according to claim 1 system, it is characterized in that, described pilot control system comprises the pilot control oil circuit that is connected between described pioneer pump (1) and described hydraulic work device (200), the described the other end that described bypass is filtered oil circuit connects described pilot control oil circuit, to be connected with described pioneer pump (1) by described pilot control oil circuit.
3. hydraulic oil filtering according to claim 2 system, it is characterized in that, described bypass is filtered in oil circuit and is provided with the series flow control valve (2) of connecting with described bypass strainer (3), the filler opening of this series flow control valve (2) connects described pilot control oil circuit, and oil outlet connects described bypass strainer (3).
4. hydraulic oil filtering according to claim 3 system, is characterized in that, described bypass strainer (3) is not more than the hydraulic oil filter of 1 μ m for filter precision.
5. hydraulic oil filtering according to claim 3 system, is characterized in that, described bypass is filtered in oil circuit and is provided with the relief valve (4) in parallel with described bypass strainer (3).
6. hydraulic oil filtering according to claim 3 system, is characterized in that, described bypass is filtered in oil circuit and is provided with the first bypass one-way valve in parallel with described bypass strainer (3).
7. hydraulic oil filtering according to claim 1 system, it is characterized in that, described hydraulic oil filtering system comprises that also oil outlet from described hydraulic work device (200) to the main oil circuit described hydraulic oil container (100), is provided with return filter (7) in this main oil circuit.
8. hydraulic oil filtering according to claim 7 system, is characterized in that, the filter precision of described return filter (7) is less than the filter precision of described bypass strainer (3).
9. hydraulic oil filtering according to claim 7 system, is characterized in that, also is provided with back pressure one-way valve (5) and the cooler (6) of connecting with described return filter (7) on described main oil circuit.
10. hydraulic oil filtering according to claim 9 system, it is characterized in that, also be provided with the second bypass one-way valve (8) in parallel with described back pressure one-way valve (5) and cooler (6) on described main oil circuit, and the three bypass one-way valve (9) in parallel with described return filter (7).
11. hydraulic shovel is characterized in that, has in this hydraulic shovel according to the described hydraulic oil filtering of any one system in the claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310106361.XA CN103174704B (en) | 2013-03-29 | 2013-03-29 | Hydraulic oil filtration system and hydraulic shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310106361.XA CN103174704B (en) | 2013-03-29 | 2013-03-29 | Hydraulic oil filtration system and hydraulic shovel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103174704A true CN103174704A (en) | 2013-06-26 |
| CN103174704B CN103174704B (en) | 2016-02-17 |
Family
ID=48634787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310106361.XA Active CN103174704B (en) | 2013-03-29 | 2013-03-29 | Hydraulic oil filtration system and hydraulic shovel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103174704B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438055A (en) * | 2013-09-06 | 2013-12-11 | 四川万冠机电技术有限公司 | On-line cleaning machine of large-sized hydraulic equipment |
| CN103883590A (en) * | 2014-04-15 | 2014-06-25 | 山推工程机械股份有限公司 | Bulldozer and hydraulic system thereof |
| CN104695502A (en) * | 2015-03-13 | 2015-06-10 | 辽宁瑞丰专用车制造有限公司 | Hydraulic system of dual-purpose excavation and shoveling machine |
| CN107448441A (en) * | 2017-09-26 | 2017-12-08 | 东北大学 | A kind of hydraulic oil source system for pilot plant |
| CN111980103A (en) * | 2019-05-22 | 2020-11-24 | 山东临工工程机械有限公司 | Excavator hydraulic system and breaking hammer operation mode switching method |
| CN113586559A (en) * | 2021-07-22 | 2021-11-02 | 三一重机有限公司 | Hydraulic oil cooling system and working machine |
| WO2023226482A1 (en) * | 2022-05-27 | 2023-11-30 | 三一重型装备有限公司 | On-line oil purification system of roadheader and roadheader |
| CN117450126A (en) * | 2023-12-20 | 2024-01-26 | 中联重科土方机械有限公司 | Hydraulic system, oil return control method and related equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4011913A1 (en) * | 1990-04-12 | 1991-10-17 | Beyer Rudi Dipl Ing | Hydraulic system with filter - separates out fine particles by channelling part of flow through by=pass line |
| JPH0681815A (en) * | 1992-08-31 | 1994-03-22 | Hitachi Constr Mach Co Ltd | Filter of oil pressure circuit |
| JP2000303504A (en) * | 1999-04-20 | 2000-10-31 | Shin Caterpillar Mitsubishi Ltd | Diagnostic system for hydraulic fluid in hydraulic machine |
| CN102758805A (en) * | 2011-04-20 | 2012-10-31 | J.C.班福德挖掘机有限公司 | Hydraulic circuit and working machine including the same |
| CN202531548U (en) * | 2012-03-12 | 2012-11-14 | 启东市南方润滑液压设备有限公司 | Independent cooling and filtering system of hydraulic station |
| CN202644636U (en) * | 2012-05-21 | 2013-01-02 | 徐州徐工挖掘机械有限公司 | Large-scale excavator oil return system |
| CN202746339U (en) * | 2012-09-11 | 2013-02-20 | 中联重科股份有限公司 | Hydraulic filtering system as well as hydraulic control system and engineering machinery comprising same |
| CN202768539U (en) * | 2012-07-05 | 2013-03-06 | 徐州徐工基础工程机械有限公司 | By-pass filtering apparatus ensuring cleanliness of heading machine hydraulic oil |
-
2013
- 2013-03-29 CN CN201310106361.XA patent/CN103174704B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4011913A1 (en) * | 1990-04-12 | 1991-10-17 | Beyer Rudi Dipl Ing | Hydraulic system with filter - separates out fine particles by channelling part of flow through by=pass line |
| JPH0681815A (en) * | 1992-08-31 | 1994-03-22 | Hitachi Constr Mach Co Ltd | Filter of oil pressure circuit |
| JP2000303504A (en) * | 1999-04-20 | 2000-10-31 | Shin Caterpillar Mitsubishi Ltd | Diagnostic system for hydraulic fluid in hydraulic machine |
| CN102758805A (en) * | 2011-04-20 | 2012-10-31 | J.C.班福德挖掘机有限公司 | Hydraulic circuit and working machine including the same |
| CN202531548U (en) * | 2012-03-12 | 2012-11-14 | 启东市南方润滑液压设备有限公司 | Independent cooling and filtering system of hydraulic station |
| CN202644636U (en) * | 2012-05-21 | 2013-01-02 | 徐州徐工挖掘机械有限公司 | Large-scale excavator oil return system |
| CN202768539U (en) * | 2012-07-05 | 2013-03-06 | 徐州徐工基础工程机械有限公司 | By-pass filtering apparatus ensuring cleanliness of heading machine hydraulic oil |
| CN202746339U (en) * | 2012-09-11 | 2013-02-20 | 中联重科股份有限公司 | Hydraulic filtering system as well as hydraulic control system and engineering machinery comprising same |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438055A (en) * | 2013-09-06 | 2013-12-11 | 四川万冠机电技术有限公司 | On-line cleaning machine of large-sized hydraulic equipment |
| CN103438055B (en) * | 2013-09-06 | 2015-09-09 | 四川万冠机电技术有限公司 | Large Hydraulic Equipment on-line cleaning machine |
| CN103883590A (en) * | 2014-04-15 | 2014-06-25 | 山推工程机械股份有限公司 | Bulldozer and hydraulic system thereof |
| CN104695502A (en) * | 2015-03-13 | 2015-06-10 | 辽宁瑞丰专用车制造有限公司 | Hydraulic system of dual-purpose excavation and shoveling machine |
| CN104695502B (en) * | 2015-03-13 | 2017-04-19 | 辽宁瑞丰专用车制造有限公司 | Hydraulic system of dual-purpose excavation and shoveling machine |
| CN107448441A (en) * | 2017-09-26 | 2017-12-08 | 东北大学 | A kind of hydraulic oil source system for pilot plant |
| CN111980103A (en) * | 2019-05-22 | 2020-11-24 | 山东临工工程机械有限公司 | Excavator hydraulic system and breaking hammer operation mode switching method |
| CN111980103B (en) * | 2019-05-22 | 2022-06-07 | 山东临工工程机械有限公司 | Excavator hydraulic system and breaking hammer operation mode switching method |
| CN113586559A (en) * | 2021-07-22 | 2021-11-02 | 三一重机有限公司 | Hydraulic oil cooling system and working machine |
| CN113586559B (en) * | 2021-07-22 | 2024-01-23 | 三一重机有限公司 | Hydraulic oil cooling system and working machine |
| WO2023226482A1 (en) * | 2022-05-27 | 2023-11-30 | 三一重型装备有限公司 | On-line oil purification system of roadheader and roadheader |
| CN117450126A (en) * | 2023-12-20 | 2024-01-26 | 中联重科土方机械有限公司 | Hydraulic system, oil return control method and related equipment |
| CN117450126B (en) * | 2023-12-20 | 2024-03-15 | 中联重科土方机械有限公司 | Hydraulic system, oil return control method and related equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103174704B (en) | 2016-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103174704B (en) | Hydraulic oil filtration system and hydraulic shovel | |
| CN101164654A (en) | Bi-directional two stage composite filter structure | |
| CN201982092U (en) | Height-adjusting hydraulic system of electric traction coal winning machine | |
| CN202746339U (en) | Hydraulic filtering system as well as hydraulic control system and engineering machinery comprising same | |
| CN201882141U (en) | Steering hydraulic integrated system of electric-wheel dump car | |
| CN202644636U (en) | Large-scale excavator oil return system | |
| CN208041113U (en) | Double clutch gearbox hydraulic systems | |
| CN204175686U (en) | A kind of bender hydraulic system | |
| CN202971431U (en) | Bypass filtration system | |
| CN103470940A (en) | Control valve system used for absorbing and discharging oil of transfer case lubrication oil pump in forward and reverse directions | |
| CN202391872U (en) | Hydraulic oil ultra-precision micro-filtrating system in hydraulic excavator | |
| CN108716487A (en) | Tractor shares oil hydraulic system and tractor | |
| CN203400566U (en) | Filter capable of achieving double-direction filtering | |
| CN202140378U (en) | Oil suction and return filter system for protecting two-way check valve | |
| CN204098987U (en) | Combustion oil cooler structure | |
| CN204436919U (en) | Multi-channel hydraulic divides oily device | |
| CN102733445B (en) | Pilot oil source valve group for small-size hydraulic excavator | |
| CN204041600U (en) | Multipath hydraulic motor speed governing feedback control valve | |
| CN202326527U (en) | Closed hydraulic loop and concrete pumping equipment | |
| CN209781131U (en) | wind wheel lock brake valve group | |
| CN202900621U (en) | Intelligent pump control valve | |
| CN103233935B (en) | Integrated valve group of hydraulic system | |
| CN203532372U (en) | Fan-shaped section clamping hydraulic system based on hydraulic synchronous motor control | |
| CN100540919C (en) | Variable plunger pump system for drilling machine | |
| CN205605523U (en) | Hydraulic control device of harvester is raised to green grass or young crops |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |