CN108679236A - A kind of mixed dynamic HBW stabilizations injected system of gas-liquid - Google Patents
A kind of mixed dynamic HBW stabilizations injected system of gas-liquid Download PDFInfo
- Publication number
- CN108679236A CN108679236A CN201810831492.7A CN201810831492A CN108679236A CN 108679236 A CN108679236 A CN 108679236A CN 201810831492 A CN201810831492 A CN 201810831492A CN 108679236 A CN108679236 A CN 108679236A
- Authority
- CN
- China
- Prior art keywords
- level
- chamber
- hbw
- grease
- motor distributor
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
- F16N7/38—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with a separate pump; Central lubrication systems
Abstract
The present invention proposes a kind of mixed dynamic HBW of gas-liquid and stablizes injected system, for solve the problems, such as it is discontinuous in HBW grease injection lengths can not synchronous greasing with each greasing point.The present invention includes proportional cylinder, Pneumatic grease pump, greasing circuit and hydraulic circuit, and proportional cylinder includes grease chamber, air chamber and hydraulic fluid chamber, and grease chamber and hydraulic fluid chamber are located at the both sides of air chamber, piston rod are equipped in air chamber；The hydraulic fluid chamber is connected with hydraulic circuit, and hydraulic circuit is equipped with flow controlling unit；The grease chamber is connected with Pneumatic grease pump and greasing circuit respectively, and greasing circuit includes level-one motor distributor and two level motor distributor, and grease chamber is connected with level-one motor distributor, and level-one motor distributor is connected with two level motor distributor.The present invention is combined the synchronism and stability for realizing each greasing point HBW greases injection of labyrinth seal chamber by pneumatic and hydraulic control, it is ensured that main driving seals work steady in a long-term.
Description
Technical field
The present invention relates to the technical fields of the main driving labyrinth seal of shield more particularly to a kind of mixed dynamic HBW of gas-liquid to stablize note
Enter system, pneumatic control and hydraulic control, which are combined, realizes that HBW stablizes injection.
Background technology
In shield-tunneling construction, main driving is directly facing native storehouse mud hydraulic pressure, in order to ensure that main driving being capable of reliable and stable work
Make, main driving needs reliable grease injected system.The first line of defence of the labyrinth seal chamber as sealing system is general to inject
HBW greases, the adhesive force of the grease is good, good airproof performance and waterproof are good, can effectively stop that dregs and muddy water enter master
Driving.
Currently, the HBW injected systems that shield industry uses, are directly injected into motor distributor, so by Pneumatic grease pump
Each point of main driving labyrinth seal chamber is injected by the shunting of motor distributor afterwards, and motor distributor front is by pneumatic ball valve control
Whether system is injected.Since HBW greases are at high price, main driving should be protected to control construction cost again, it is necessary to rationally control HBW
Injection rate, counted by motor distributor and control injection rate, when motor distributor injection rate reaches design requirement, cut-out should
The pneumatic ball valve on road stops road HBW greases injection.But this HBW injected systems used at present have the following problems：1）By
Change greatly in the compressibility and grease transporting resistance of gas, simple control gas pressure and flow, grease pump action frequency exist
Unit interval is difficult control, therefore the HBW oil quantities for injecting labyrinth chamber cannot achieve temporal continuous control；2）HBW greases
Injected system is generally made of multiple motor distributors, and the resistance of each motor distributor is different, and each motor distributor will
Asynchronous, the greasing point of different distributors can not synchronize greasing, cause the greasing of each point uneven, be unfavorable for the guarantor of sealing
Shield；3）HBW injects that flow is small, and only tens milliliters per minute, and grease contains many fibers, currently without can be continuously steady
Surely the pump injected.
Invention content
For it is discontinuous in the HBW grease injection lengths of existing HBW greases injected system can not be synchronous with each greasing point
The technical issues of greasing, the present invention propose that a kind of mixed dynamic HBW of gas-liquid stablizes injected system, are combined by pneumatic and hydraulic control
Mode, realize being uniformly injected into for the upper steady and continuous injection of HBW grease times and each point, ensure the stability of sealing, improve
The reliability of sealing, enables the main driving work normally steadily in the long term.
In order to achieve the above object, the technical proposal of the invention is realized in this way：A kind of mixed dynamic HBW stabilizations injection of gas-liquid
System, including proportional cylinder, Pneumatic grease pump, greasing circuit and hydraulic circuit, proportional cylinder include grease chamber, air chamber and liquid
Pumping cavity, grease chamber and hydraulic fluid chamber are located at the both sides of air chamber, and piston rod is equipped in air chamber；The hydraulic fluid chamber with
Hydraulic circuit is connected, and hydraulic circuit is equipped with flow controlling unit；The grease chamber is returned with Pneumatic grease pump and greasing respectively
Road is connected, and greasing circuit includes level-one motor distributor and two level motor distributor, grease chamber and level-one motor distributor phase
Connection, level-one motor distributor are connected with two level motor distributor.
The hydraulic flow control unit includes manual ball valve, pressure reducing valve, solenoid directional control valve I and the extra small flow tune of high-precision
Fast valve, manual ball valve are connected with hydraulic oil pump, and manual ball valve is connected by pipeline with pressure reducing valve, pressure reducing valve by pipeline with
Solenoid directional control valve is connected, and solenoid directional control valve is connected by pipeline with the extra small flow speed governing valve of high-precision, the extra small stream of high-precision
Amount speed governing valve is connected by pipeline with the hydraulic fluid chamber of proportional cylinder.
The air chamber is equipped with for filtering the air filter into air in proportional cylinder air chamber, piston rod both sides point
Not She You first piston and second piston, first piston is arranged in the body of rod of proportional cylinder, and second piston setting is in ratio oil
In the cylinder body of cylinder, the diameter of first piston is less than the diameter of second piston.
The greasing circuit is equipped with pneumatic ball valve and pressure sensor, and grease chamber is connected by pipeline with pneumatic ball valve
It connects, pneumatic ball valve is connected by pipeline with pressure sensor, and pressure sensor is connected by pipeline with level-one motor distributor
It connects.
The level-one motor distributor be equipped at least two branches, each branch respectively with a two level motor distributor phase
It connects, at least two branches is equipped on two level motor distributor.
The level-one motor distributor is set there are three branch, each branch respectively with two level motor distributor I, two level motor
Distributor II is connected with two level motor distributor III, two level motor distributor I, two level motor distributor II and two level motor
Branch there are five being all provided on distributor III.
The Pneumatic grease pump is connected by solenoid directional control valve II with air source.
Beneficial effects of the present invention：HBW greases by proportional cylinder by HBW greases inject level-one motor distributor, then by
Level-one motor distributor enters two level motor distributor after dividing equally, and realizes the synchronization greasing of each greasing point of labyrinth seal chamber；Together
When high-precision speed governing valve control proportional cylinder movement velocity, and then control HBW greasing injection rate；Proportional cylinder passes through pneumatic
Grease pump completes the repairing of HBW, is a kind of novel gas-liquid mixing control program.The present invention is combined by pneumatic and hydraulic control
Realize the synchronism and stability of each greasing point HBW greases injection of labyrinth seal chamber, it is ensured that main driving sealing is long-term
Stable work.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the structural diagram of the present invention.
Wherein, 1 is manual ball valve, and 2 be pressure reducing valve, and 3 be solenoid directional control valve I, and 4 be the extra small flow speed governing valve of high-precision, and 5 are
Proportional cylinder, 6 be air filter, and 7 be pneumatic ball valve, and 8 be pressure sensor, and 9 be level-one motor distributor, and 10 be two level motor point
Orchestration I, 11 be two level motor distributor II, and 12 be two level motor distributor III, and 13 be Pneumatic grease pump, and 14 be electromagnetic switch
Valve II.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of not making the creative labor
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of mixed dynamic HBW of gas-liquid stablizes injected system, including proportional cylinder 5, Pneumatic grease pump 13, greasing
Circuit and hydraulic circuit, proportional cylinder 5 include grease chamber A, air chamber B and hydraulic fluid chamber C, and grease chamber A and hydraulic fluid chamber C distinguish
Piston rod is equipped in the both sides of air chamber B, air chamber B；The hydraulic fluid chamber C is connected with hydraulic circuit, hydraulic circuit
It is equipped with flow controlling unit.The grease chamber A is connected with Pneumatic grease pump 13 and greasing circuit respectively, and greasing circuit includes
Level-one motor distributor 9 and two level motor distributor, grease chamber A are connected with level-one motor distributor 9, level-one motor distributor
9 are connected with two level motor distributor.The pipeline being connect with grease chamber A is equipped with the ball valve for control piper break-make, convenient
Subsequent maintenance.Grease chamber A is used for storing HBW greases, and the oil quantity of grease chamber A meets the injection of stablizing of system 5min or more, empty
Air cavity B is connected with air.Pneumatic grease pump 13 to HBW injected systems provide grease.
The hydraulic flow control unit includes manual ball valve 1, pressure reducing valve 2, solenoid directional control valve I3 and the extra small stream of high-precision
Speed governing valve 4 is measured, manual ball valve 1 is connected with hydraulic oil pump, and manual ball valve 1 is connected by pipeline with pressure reducing valve 2, pressure reducing valve 2
It is connected with solenoid directional control valve I3 by pipeline, solenoid directional control valve I3 is connected by pipeline with extra small flow speed governing valve 4 in high precision
It connects, the extra small flow speed governing valve 4 of high-precision is connected by pipeline with the hydraulic fluid chamber C of proportional cylinder 5.Pressure reducing valve 2 is adjusting
The pressure of hydraulic circuit makes the pressure of hydraulic circuit meet the need of work of hydraulic cylinder.Solenoid directional control valve I3 is realizing ratio
The commutation of oil cylinder 5；Extra small flow speed governing valve 4 makes proportional cylinder 5 to the flow of hydraulic oil in hydraulic circuit for regulating in high precision
Piston rod slowly stablizes movement.
The air chamber B is equipped with for filtering the air filter 6 into air in 5 air chamber B of proportional cylinder, piston rod two
Side is respectively equipped with first piston and second piston, and first piston is arranged in the body of rod of proportional cylinder 5, second piston setting than
In the cylinder body of example oil cylinder 5, the diameter of first piston is less than the diameter of second piston.It is grease between first piston and rod end
Chamber A, is air chamber B between first piston and second piston, is hydraulic fluid chamber C between second piston and cylinder body tail portion.
The greasing circuit is equipped with pneumatic ball valve 7 and pressure sensor 8, and grease chamber A passes through pipeline and 7 phase of pneumatic ball valve
Connection, pneumatic ball valve 7 are connected by pipeline with pressure sensor 8, and pressure sensor 8 passes through pipeline and level-one motor distributor
9 are connected.Pneumatic ball valve 7 is used for controlling the through and off of HBW grease infusion circuits.Pressure sensor 8 is used for monitoring HBW greases note
The real-time pressure of entry loop.When Pneumatic grease pump 13 supplements HBW greases to the grease chamber A of proportional cylinder 5, pneumatic ball valve 7 closes
It closes, when pressure sensor 8 detects that greasing circuit pressure is greater than the set value, pneumatic ball valve 7 can also cut off greasing circuit, play
Protective effect.
The level-one motor distributor 9 be equipped at least two branches, each branch respectively with a two level motor distributor
It is connected, at least two branches is equipped on two level motor distributor.Level-one motor distributor 9 is used for ensureing to be assigned to two level horse
Flow up to distributor is identical, to ensure the synchronism of each decanting point greasing.
The level-one motor distributor 9 is set there are three branch, each branch respectively with two level motor distributor I10, two level
Motor distributor II11 is connected with two level motor distributor III12, two level motor distributor I10, two level motor distributor
Branch there are five being all provided on II11 and two level motor distributor III12.The guarantee of level-one motor distributor 9 is assigned to two level motor point
Orchestration I10, two level motor distributor II11 are identical with the flow of two level motor distributor III12.
The Pneumatic grease pump 13 is connected by solenoid directional control valve II14 with air source.Solenoid directional control valve II14 is used for controlling
The on and off of air source is logical when needing to add HBW greases to grease chamber A, is otherwise disconnected.
The present invention the course of work be：Solenoid directional control valve II14 first obtains electric left position work, and Pneumatic grease pump 13 works, to
The grease chamber A of proportional cylinder 5 injects grease, the repairing action of completed percentage oil cylinder, later solenoid directional control valve II14 power-off；Then
Pneumatic ball valve 7 is opened, and solenoid directional control valve I3 obtains electric left position work, and the hydraulic fluid chamber C that hydraulic oil enters proportional cylinder 5 pushes piston
Bar moves, and the HBW greases in grease chamber A enter greasing circuit, is distributed by two level motor after being divided equally by level-one motor distributor 9
Being injected into for device I10, two level motor distributor II11 and tri- motor distributor synchronism stabilities of two level motor distributor III12 is each
A greasing point.The movement velocity of proportional cylinder 5 can be adjusted by adjusting extra small flow speed governing valve 4 in high precision, and then is adjusted every
The greasing amount of minute.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (7)
1. a kind of mixed dynamic HBW of gas-liquid stablizes injected system, which is characterized in that including proportional cylinder（5）, Pneumatic grease pump（13）、
Greasing circuit and hydraulic circuit, proportional cylinder（5）Including grease chamber（A）, air chamber（B）And hydraulic fluid chamber（C）, grease chamber（A）
And hydraulic fluid chamber（C）It is located at air chamber（B）Both sides, air chamber（B）It is interior to be equipped with piston rod；The hydraulic fluid chamber（C）With
Hydraulic circuit is connected, and hydraulic circuit is equipped with flow controlling unit；The grease chamber（A）Respectively with Pneumatic grease pump（13）With
Greasing circuit is connected, and greasing circuit includes level-one motor distributor（9）With two level motor distributor, grease chamber（A）With level-one
Motor distributor（9）It is connected, level-one motor distributor（9）It is connected with two level motor distributor.
2. the mixed dynamic HBW of gas-liquid according to claim 1 stablizes injected system, which is characterized in that the hydraulic flow control
Unit includes manual ball valve（1）, pressure reducing valve（2）, solenoid directional control valve I（3）With the extra small flow speed governing valve of high-precision（4）, manual ball
Valve（1）It is connected with hydraulic oil pump, manual ball valve（1）Pass through pipeline and pressure reducing valve（2）It is connected, pressure reducing valve（2）Pass through pipeline
With solenoid directional control valve I（3）It is connected, solenoid directional control valve I（3）Pass through pipeline and the extra small flow speed governing valve of high-precision（4）It is connected,
Extra small flow speed governing valve in high precision（4）Pass through pipeline and proportional cylinder（5）Hydraulic fluid chamber（C）It is connected.
3. the mixed dynamic HBW of gas-liquid according to claim 1 stablizes injected system, which is characterized in that the air chamber（B）On set
It is useful for filtering and enters proportional cylinder（5）Air chamber（B）The air filter of middle air（6）, piston rod both sides are respectively equipped with the first work
Plug and second piston, first piston are arranged in proportional cylinder（5）The body of rod in, second piston be arranged in proportional cylinder（5）Cylinder
In vivo, the diameter of first piston is less than the diameter of second piston.
4. the mixed dynamic HBW of gas-liquid according to any one of claim 1-3 stablizes injected system, which is characterized in that described
Greasing circuit is equipped with pneumatic ball valve（7）And pressure sensor（8）, grease chamber（A）Pass through pipeline and pneumatic ball valve（7）It is connected
It connects, pneumatic ball valve（7）Pass through pipeline and pressure sensor（8）It is connected, pressure sensor（8）Pass through pipeline and level-one motor point
Orchestration（9）It is connected.
5. the mixed dynamic HBW of gas-liquid according to claim 1 stablizes injected system, which is characterized in that the level-one motor distribution
Device（9）Equipped at least two branches, each branch is connected with a two level motor distributor respectively, on two level motor distributor
It is equipped at least two branches.
6. the mixed dynamic HBW of gas-liquid according to claim 5 stablizes injected system, which is characterized in that the level-one motor distribution
Device（9）If there are three branch, each branch respectively with two level motor distributor I（10）, two level motor distributor II（11）With two
Grade motor distributor III（12）It is connected, two level motor distributor I（10）, two level motor distributor II（11）With two level motor
Distributor III（12）On be all provided with there are five branch.
7. the mixed dynamic HBW of gas-liquid according to claim 1 or 2 stablizes injected system, which is characterized in that the Pneumatic grease pump
（13）Pass through solenoid directional control valve II（14）It is connected with air source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810831492.7A CN108679236B (en) | 2018-07-26 | 2018-07-26 | Gas-liquid mixed HBW stable injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810831492.7A CN108679236B (en) | 2018-07-26 | 2018-07-26 | Gas-liquid mixed HBW stable injection system |
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| Publication Number | Publication Date |
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| CN108679236A true CN108679236A (en) | 2018-10-19 |
| CN108679236B CN108679236B (en) | 2023-09-08 |
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| CN201810831492.7A Active CN108679236B (en) | 2018-07-26 | 2018-07-26 | Gas-liquid mixed HBW stable injection system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323116A (en) * | 2018-12-25 | 2019-02-12 | 厦门厦工中铁重型机械有限公司 | One kind being suitable for shield machine assembly mechanism automatic lubrication installation and its control method |
| CN109854625A (en) * | 2018-11-18 | 2019-06-07 | 中国电建集团铁路建设有限公司 | A kind of shield automatic adjustment main shaft seals rouge injected system |
| CN113586925A (en) * | 2021-09-08 | 2021-11-02 | 青岛盘古智能制造股份有限公司 | Be used for deep water operation equipment pressure continuously adjustable lubricating system |
| CN114151419A (en) * | 2021-12-21 | 2022-03-08 | 南京麦克菲自动控制有限公司 | Multi-pump combined hydraulic power system based on servo motor control |
| CN115627810A (en) * | 2022-09-29 | 2023-01-20 | 华能伊敏煤电有限责任公司 | Automatic oiling device for excavator walking, control system and method |
| CN113586925B (en) * | 2021-09-08 | 2024-04-30 | 青岛盘古智能制造股份有限公司 | Pressure continuously adjustable lubrication system for deepwater operation equipment |
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| DE4036484A1 (en) * | 1990-11-16 | 1992-05-21 | Westfalia Becorit Ind Tech | Central lubrication device for underground mining machine - couples all lubrication lines via distributor to hydraulically-operated grease gun |
| CN103644305A (en) * | 2013-12-06 | 2014-03-19 | 南车资阳机车有限公司 | HBW grease system of composite stratum shield tunneling machine primary seal |
| CN204300375U (en) * | 2014-12-08 | 2015-04-29 | 南京贝奇尔机械有限公司 | A kind of tail seal grease of shield injected system |
| CN206112091U (en) * | 2016-08-29 | 2017-04-19 | 中铁机械装备研究设计院(成都)有限公司 | Last lubricated main drive labyrinth seals's HBW system |
| CN106640100A (en) * | 2017-02-21 | 2017-05-10 | 厦门厦工中铁重型机械有限公司 | Improved shield master driving HBW grease injection device and control method thereof |
| CN208734887U (en) * | 2018-07-26 | 2019-04-12 | 中铁工程装备集团有限公司 | The mixed dynamic HBW of gas-liquid stablizes injected system |
-
2018
- 2018-07-26 CN CN201810831492.7A patent/CN108679236B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4036484A1 (en) * | 1990-11-16 | 1992-05-21 | Westfalia Becorit Ind Tech | Central lubrication device for underground mining machine - couples all lubrication lines via distributor to hydraulically-operated grease gun |
| CN103644305A (en) * | 2013-12-06 | 2014-03-19 | 南车资阳机车有限公司 | HBW grease system of composite stratum shield tunneling machine primary seal |
| CN204300375U (en) * | 2014-12-08 | 2015-04-29 | 南京贝奇尔机械有限公司 | A kind of tail seal grease of shield injected system |
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| CN208734887U (en) * | 2018-07-26 | 2019-04-12 | 中铁工程装备集团有限公司 | The mixed dynamic HBW of gas-liquid stablizes injected system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854625A (en) * | 2018-11-18 | 2019-06-07 | 中国电建集团铁路建设有限公司 | A kind of shield automatic adjustment main shaft seals rouge injected system |
| CN109323116A (en) * | 2018-12-25 | 2019-02-12 | 厦门厦工中铁重型机械有限公司 | One kind being suitable for shield machine assembly mechanism automatic lubrication installation and its control method |
| CN109323116B (en) * | 2018-12-25 | 2023-09-12 | 厦门厦工中铁重型机械有限公司 | Automatic lubrication device suitable for shield tunneling machine assembly mechanism and control method thereof |
| CN113586925A (en) * | 2021-09-08 | 2021-11-02 | 青岛盘古智能制造股份有限公司 | Be used for deep water operation equipment pressure continuously adjustable lubricating system |
| CN113586925B (en) * | 2021-09-08 | 2024-04-30 | 青岛盘古智能制造股份有限公司 | Pressure continuously adjustable lubrication system for deepwater operation equipment |
| CN114151419A (en) * | 2021-12-21 | 2022-03-08 | 南京麦克菲自动控制有限公司 | Multi-pump combined hydraulic power system based on servo motor control |
| CN114151419B (en) * | 2021-12-21 | 2023-08-22 | 南京麦克菲自动控制有限公司 | Multi-pump combined hydraulic power system based on servo motor control |
| CN115627810A (en) * | 2022-09-29 | 2023-01-20 | 华能伊敏煤电有限责任公司 | Automatic oiling device for excavator walking, control system and method |
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