CN108757592A - A kind of control mode and device of rolling mill hydro-cushion - Google Patents
A kind of control mode and device of rolling mill hydro-cushion Download PDFInfo
- Publication number
- CN108757592A CN108757592A CN201810501482.7A CN201810501482A CN108757592A CN 108757592 A CN108757592 A CN 108757592A CN 201810501482 A CN201810501482 A CN 201810501482A CN 108757592 A CN108757592 A CN 108757592A
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- Prior art keywords
- pressure
- tank
- main pump
- hydro
- air pressure
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Classifications
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
- F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/005—Leakage; Spillage; Hose burst
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/87—Detection of failures
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Present invention mainly discloses a kind of control modes and device of rolling mill hydro-cushion, relate generally to equipment in Rolling Mill technical field, including main pump, it is pumped equipped with ftercompction in main pump side, the main pump, ftercompction pumps one end respectively by main pump delivery valve, Fill valve is connect with air pressure tank, the other end is connect with fuel tank, the fuel tank other end is looked for be respectively equipped with fuel tank Fill valve, oil return valve, the oil return valve is connect with air pressure tank, it is equipped with controller in the air pressure tank side, the controller is connect with air pressure tank by being mounted on pressure switch on air pressure tank, the pressurized tank opens connection main pump and ftercompction pump, alarm is equipped on the air pressure tank, effectively avoid motor and hydraulic pump frequent start-stop, Hydraulic Elements frequent operation is in larger pressure difference, and provide fault alarm function.
Description
Technical field
The invention mainly relates to equipment in Rolling Mill technical field, the control mode of specifically a kind of rolling mill hydro-cushion and
Device.
Background technology
Rolling mill is the mechanical equipment for realizing metal rolled process.Refer to complete stocking production overall process Zhuan Bei ﹐ include
There is Zhu that She Bei ﹑ Fu is wanted to help She Bei ﹑ handling equipmenies and auxiliary device etc..But general described milling train, which often only refers to, mainly to be set
It is standby.
Rolling mill hydraulic balance system has been used to support support roller and working roll in rolling mill, used hydro-cushion control
Mode processed is：When balance system pressure drops to lower limit, hydraulic pressure pump startup, into accumulator oiling suppress, energy storage pressure carries
After height to the upper limit, hydraulic pump is stopped, and pressure is reduced to the required pressure of compensating cylinder, Xiang Ping by the pressure reducing valve of accumulator outlet
Cylinder weigh for hydraulic oil, hydraulic oil acting when steel rolling in compensating cylinder, the pressure of accumulator continuously decreases, when being reduced to low pressure limit
When, pump starts to suppress to accumulator again, is recycled with this.
The shortcomings that control mode：The difference for the upper pressure limit and lower limit that general accumulator is allowed is smaller, and hydraulic pump is frequent
Start and stop, the compression shock number that hydraulic pump, motor, accumulator are subject to is more, and the service life of equipment can accordingly shorten.
Invention content
In view of the deficiencies in the prior art defect, the purpose of the present invention is to provide one kind avoiding motor and hydraulic pump
Frequent start-stop, Hydraulic Elements frequent operation provide the rolling mill hydro-cushion of fault alarm function in larger pressure difference
Control mode and device.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：A kind of control of rolling mill hydro-cushion
Device, including main pump are pumped in main pump side equipped with ftercompction, and the main pump, ftercompction pump one end respectively by main pump delivery valve, repairing
Valve is connect with air pressure tank, and the other end is connect with fuel tank, and the fuel tank other end is looked for be respectively equipped with fuel tank Fill valve, oil return valve, institute
It states oil return valve to connect with air pressure tank, is equipped with controller in the air pressure tank side, the controller is with air pressure tank by being mounted on
Pressure switch connects on air pressure tank, and the pressurized tank opens connection main pump and ftercompction pump, and alarm is equipped on the air pressure tank.
As a further improvement on the present invention, described to be internally provided with elastic diaphragm, the elastic diaphragm in the air pressure tank
Space in air pressure tank is divided into atmospheric pressure cavity and oil pressure chamber.
As a further improvement on the present invention, the main pump delivery valve, Fill valve, oil return valve are connect with controller respectively.
A kind of control carrying out rolling mill hydro-cushion using hydro-cushion control device described in claim 1-3 any one
Mode processed after system boot, starts main pump.Under normal circumstances, main pump runs T1After time, air pressure pressure inside the tank still reach to less than
P1, illustrating system, there are oil leakage fault, fault alarms；If air pressure pressure inside the tank reaches P1, then main pump stopping, and can be to roll
The stable hydro-cushion pressure of steel machine output, that is, enter the production consumption pressure stage, when air pressure pressure inside the tank drops to Pa0When, trigger repairing
Pump startup, main pump is without starting at this time, if repairing pump operation T2After time, air pressure pressure inside the tank does not still reach Pa1Then mend
Oil pump stops, while triggering main pump startup, boosts；If repairing pump operation T2In time, air pressure pressure inside the tank has reached Pa1,
Then slippage pump stops, and goes successively to the production consumption pressure stage, reciprocal with this.
As a further improvement on the present invention, P is set in the controller0And P1Respectively under the pressure of balance system
The pressure value that limit and upper pressure limit, i.e. main pump start and stop.
As a further improvement on the present invention, P is set in the controllera0And Pa1Respectively ftercompction pump startup and
The pressure value of stopping.
As a further improvement on the present invention, in the controller, the relationship of four pressure values is：P0< Pa0<
Pa1< P1。
As a further improvement on the present invention, in the controller, it sets main pump and ftercompction pumps the operation started every time
Duration is respectively T1And T2, T1And T2Much larger than main pump starts pressure from P0Get to P1Time, ftercompction pump startup
Pressure from Pa0Get to Pa1Time.
Compared with prior art, the device have the advantages that being：
(1) gives ftercompction pump to complete normal pressure supply in production process, and flow is small, starts continue every time
The time of operation can be elongated, and upper pressure limit can just be reached rapidly to avoid rigid startup, to by this frequent start-stop of nearly termination of pumping
Working method.
(2) main pump expensive, flow is big only has generation small probability event, and (production pressure consumes big or oil leak event
Barrier) when just start, and this small probability event requirement each startup continuous working period it is longer, can equally avoid main pump
Just start and just reaches upper pressure limit rapidly and termination of pumping.
(3) controller can export failure alarm signal, and convenient for relevant station, operating personnel have found failure in time.
(4) volume of air pressure tank is much larger than accumulator, can effectively reduce main pump and ftercompction pump stop frequency.
Description of the drawings
The present invention is further illustrated with reference to the accompanying drawings and detailed description：
Fig. 1 is a kind of hydro-cushion control flow block diagram of the control mode and device of rolling mill hydro-cushion of the present invention；
Fig. 2 is a kind of air pressure tank pressure change structure chart of the control mode and device of rolling mill hydro-cushion of the present invention；
Fig. 3 closes for four pressure sizes of controller in the control mode and device of a kind of rolling mill hydro-cushion of the present invention
It is schematic diagram；
Fig. 4 is a kind of structure chart of the control mode and device of rolling mill hydro-cushion of the present invention.
In figure：1 fuel tank, 2 ftercompctions pump, 3 Fill valves, 4 main pumps, 5 main pump delivery valves, 6 air pressure tanks, 61 atmospheric pressure cavities, 62 oil pressure
Chamber, 63 air, 64 hydraulic oil, 65 elastic diaphragms, 7 pressure switches, 8 controllers, 9 fuel tank Fill valves, 10 oil-way pipes, 11 oil returns
Valve, 12 rolling mill hydro-cushions, 13 alarms.
It is worth noting that, in the description of the present invention, term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
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, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of hydro-cushion control flow block diagram of the control mode and device of rolling mill hydro-cushion of the present invention,
After system boot, start main pump.Under normal circumstances, main pump runs T1After time, air pressure pressure inside the tank is still reached to less than P1, explanation
There are oil leakage fault, fault alarms for system；If air pressure pressure inside the tank reaches P1, then main pump stopping, and can be that rolling mill is defeated
Go out stable hydro-cushion pressure, that is, enters the production consumption pressure stage, when air pressure pressure inside the tank drops to Pa0When, triggering slippage pump opens
Dynamic, main pump is without starting at this time, if repairing pump operation T2After time, air pressure pressure inside the tank does not still reach Pa1Then slippage pump
Stop, while triggering main pump startup, boosts；If repairing pump operation T2In time, air pressure pressure inside the tank has reached Pa1, then mend
Oil pump stops, and goes successively to the production consumption pressure stage, reciprocal with this.
Fig. 2 is a kind of air pressure tank pressure change structure chart of the control mode and device of rolling mill hydro-cushion of the present invention,
Described to be internally provided with elastic diaphragm in the air pressure tank, space in air pressure tank is divided into atmospheric pressure cavity and oil pressure by the elastic diaphragm
Chamber.
Fig. 3 closes for four pressure sizes of controller in the control mode and device of a kind of rolling mill hydro-cushion of the present invention
It is schematic diagram, sets P in the controller0And P1The respectively low pressure limit and upper pressure limit of balance system, i.e. main pump start and stop
Pressure value only sets Pa0And Pa1Respectively the pressure value of the startup and stopping of ftercompction pump, the relationship of four pressure values are：P0<
Pa0< Pa1< P1, it is respectively T to set the duration of operation that main pump and ftercompction pump start every time1And T2, T1And T2Much larger than
Main pump starts pressure from P0Get to P1Time, ftercompction pump startup pressure from Pa0Get to Pa1Time.
Fig. 4 is a kind of structure chart of the control mode and device of rolling mill hydro-cushion of the present invention.Including main pump, in main pump
Side is pumped equipped with ftercompction, and the main pump, ftercompction pump one end and connected respectively by main pump delivery valve, Fill valve and air pressure tank, another
End is connect with fuel tank, and the fuel tank other end is looked for be respectively equipped with fuel tank Fill valve, oil return valve, and the oil return valve connects with air pressure tank
It connects, is equipped with controller in the air pressure tank side, the controller connects with air pressure tank by being mounted on pressure switch on air pressure tank
It connects, the pressurized tank opens connection main pump and ftercompction pump, and alarm, the main pump delivery valve, repairing are equipped on the air pressure tank
Valve, oil return valve are connect with controller respectively.
Main pump and ftercompction pump start and stop logic：When rolling mill works, when main pump, certain run time is more than T1, illustrate balance system
Oil leak inside oil leakage fault, such as pipeline oil leak, main pump occurs for system, and controller sends out halt instruction to main pump, while exporting report
Alert signal.It is more than T when ftercompction pumps certain run time2, illustrate that balance system consumption pressure is larger (such as rolling special steel), or balance
Oil leakage fault occurs for system, and controller sends out halt instruction to ftercompction pump, while sending out enabled instruction to main pump, works as balance system
Fault-free, and be when consuming to press larger, pressure quickly can be got to P by main pump1, continue control mode above, when balance is
When oil leakage fault occurs for system, output alarm signal.
The control mode of the present invention：After system boot, start main pump.Under normal circumstances, main pump runs T1After time, air pressure
Pressure inside the tank is still reached to less than P1, illustrating system, there are oil leakage faults, need maintenance personnel's timely processing；If air pressure tank internal pressure
Power reaches P1, then main pump stops, and stable hydro-cushion pressure can be exported for rolling mill, that is, enters production and consume the pressure stage,
When air pressure pressure inside the tank drops to Pa0When, repairing pump startup is triggered, main pump is without starting at this time, if repairing pump operation T2Time
Afterwards, air pressure pressure inside the tank does not still reach Pa1Then slippage pump stops, while triggering main pump startup, boosts；If slippage pump
Run T2In time, air pressure pressure inside the tank has reached Pa1, then slippage pump stopping goes successively to the production consumption pressure stage, reciprocal with this,
Realize that main pump is used in system initial start stage, subsequently by the control mode of repairing pump work.
Claims (8)
1. a kind of control device of rolling mill hydro-cushion, it is characterised in that：Including main pump, pumped equipped with ftercompction in main pump side,
The main pump, ftercompction pump one end and are connected respectively by main pump delivery valve, Fill valve and air pressure tank, and the other end connect with fuel tank, looks for
The fuel tank other end is respectively equipped with fuel tank Fill valve, oil return valve, and the oil return valve is connect with air pressure tank, in the air pressure tank one
Side is equipped with controller, and the controller is connect with air pressure tank by being mounted on pressure switch on air pressure tank, and the pressurized tank opens company
Main pump and ftercompction pump are connect, alarm is equipped on the air pressure tank.
2. a kind of control device of rolling mill hydro-cushion according to claim 1, which is characterized in that described in the gas
Pressure tank is internally provided with elastic diaphragm, and space in air pressure tank is divided into atmospheric pressure cavity and oil pressure chamber by the elastic diaphragm.
3. a kind of control device of rolling mill hydro-cushion according to claim 1, which is characterized in that the main pump is fuel-displaced
Valve, Fill valve, oil return valve are connect with controller respectively.
4. a kind of control carrying out rolling mill hydro-cushion using hydro-cushion control device described in claim 1-3 any one
Mode, which is characterized in that after system boot, start main pump.Under normal circumstances, main pump runs T1After time, air pressure pressure inside the tank
It still reaches to less than P1, illustrating system, there are oil leakage fault, fault alarms；If air pressure pressure inside the tank reaches P1, then main pump stopping,
And can be the stable hydro-cushion pressure of rolling mill output, that is, enter the production consumption pressure stage, when air pressure pressure inside the tank drops to Pa0
When, repairing pump startup is triggered, main pump is without starting at this time, if repairing pump operation T2After time, air pressure pressure inside the tank does not still have
Have and reaches Pa1Then slippage pump stops, while triggering main pump startup, boosts；If repairing pump operation T2In time, in air pressure tank
Pressure has reached Pa1, then slippage pump stopping goes successively to the production consumption pressure stage, reciprocal with this.
It a kind of is carried out using hydro-cushion control device described in claim 1-3 any one 5. according to claim 4
The control mode of rolling mill hydro-cushion, which is characterized in that set P in the controller0And P1The respectively pressure of balance system
The pressure value that power lower limit and upper pressure limit, i.e. main pump start and stop.
It a kind of is carried out using hydro-cushion control device described in claim 1-3 any one 6. according to claim 4
The control mode of rolling mill hydro-cushion, which is characterized in that set P in the controllera0And Pa1What respectively ftercompction pumped opens
Pressure value that is dynamic and stopping.
7. according to claim 5 and 6 it is a kind of using hydro-cushion control device described in claim 1-3 any one into
The control mode of row rolling mill hydro-cushion, which is characterized in that in the controller, the relationship of four pressure values is：
P0< Pa0< Pa1< P1。
8. according to claim 5 and 6 it is a kind of using hydro-cushion control device described in claim 1-3 any one into
The control mode of row rolling mill hydro-cushion, which is characterized in that in the controller, set main pump and ftercompction pump starts every time
The duration of operation be respectively T1And T2, T1And T2Much larger than main pump starts pressure from P0Get to P1Time, ftercompction
Pump startup is pressure from Pa0Get to Pa1Time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810501482.7A CN108757592B (en) | 2018-05-23 | 2018-05-23 | A kind of hydro-cushion control device carries out the control mode of rolling mill hydro-cushion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810501482.7A CN108757592B (en) | 2018-05-23 | 2018-05-23 | A kind of hydro-cushion control device carries out the control mode of rolling mill hydro-cushion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108757592A true CN108757592A (en) | 2018-11-06 |
| CN108757592B CN108757592B (en) | 2019-12-03 |
Family
ID=64006396
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810501482.7A Active CN108757592B (en) | 2018-05-23 | 2018-05-23 | A kind of hydro-cushion control device carries out the control mode of rolling mill hydro-cushion |
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Citations (10)
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|---|---|---|---|---|
| US3422727A (en) * | 1967-08-04 | 1969-01-21 | Pacific Press & Shear Corp | Two speed ram type machine |
| JPS57105576A (en) * | 1980-12-22 | 1982-07-01 | Kawasaki Yukou Kk | Driving device of oil hydraulic pump with fly wheel |
| CN1594633A (en) * | 2004-06-24 | 2005-03-16 | 宝钢集团上海五钢有限公司 | Dampproof hydrogen sulfide stress corrosion steel and preparing method thereof |
| JP3650161B2 (en) * | 1995-03-24 | 2005-05-18 | 豊興工業株式会社 | Pressure control valve |
| CN201046459Y (en) * | 2007-06-15 | 2008-04-16 | 中国第一重型机械集团公司 | Balancing hydraulic cylinder for supporting worker rollers of rolling mill |
| CN101869912A (en) * | 2010-05-26 | 2010-10-27 | 太原重工股份有限公司 | Pressure-maintaining and regulating hydraulic control system of roll balance gear |
| CN101979159A (en) * | 2010-09-30 | 2011-02-23 | 武汉奋进电力技术有限公司 | Emergency energy storage device |
| CN201794075U (en) * | 2010-08-03 | 2011-04-13 | 萧景仁 | Pile press pressure stabilizer of hydraulic pressure retaining system |
| CN105332963A (en) * | 2014-09-17 | 2016-02-17 | 徐州重型机械有限公司 | Hydraulic speed regulation valve, hydraulic winch system and crane hydraulic system |
| CN205133187U (en) * | 2015-10-20 | 2016-04-06 | 北京凌锐能源技术有限公司 | Circulating water system soft water moisturizing ordinary pressure exhaust pressurization installation |
-
2018
- 2018-05-23 CN CN201810501482.7A patent/CN108757592B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3422727A (en) * | 1967-08-04 | 1969-01-21 | Pacific Press & Shear Corp | Two speed ram type machine |
| JPS57105576A (en) * | 1980-12-22 | 1982-07-01 | Kawasaki Yukou Kk | Driving device of oil hydraulic pump with fly wheel |
| JP3650161B2 (en) * | 1995-03-24 | 2005-05-18 | 豊興工業株式会社 | Pressure control valve |
| CN1594633A (en) * | 2004-06-24 | 2005-03-16 | 宝钢集团上海五钢有限公司 | Dampproof hydrogen sulfide stress corrosion steel and preparing method thereof |
| CN201046459Y (en) * | 2007-06-15 | 2008-04-16 | 中国第一重型机械集团公司 | Balancing hydraulic cylinder for supporting worker rollers of rolling mill |
| CN101869912A (en) * | 2010-05-26 | 2010-10-27 | 太原重工股份有限公司 | Pressure-maintaining and regulating hydraulic control system of roll balance gear |
| CN201794075U (en) * | 2010-08-03 | 2011-04-13 | 萧景仁 | Pile press pressure stabilizer of hydraulic pressure retaining system |
| CN101979159A (en) * | 2010-09-30 | 2011-02-23 | 武汉奋进电力技术有限公司 | Emergency energy storage device |
| CN105332963A (en) * | 2014-09-17 | 2016-02-17 | 徐州重型机械有限公司 | Hydraulic speed regulation valve, hydraulic winch system and crane hydraulic system |
| CN205133187U (en) * | 2015-10-20 | 2016-04-06 | 北京凌锐能源技术有限公司 | Circulating water system soft water moisturizing ordinary pressure exhaust pressurization installation |
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| Publication number | Publication date |
|---|---|
| CN108757592B (en) | 2019-12-03 |
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