CN110778543B - Pneumatic pressurization system for hydraulic oil tank of engineering machinery - Google Patents
Pneumatic pressurization system for hydraulic oil tank of engineering machinery Download PDFInfo
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- CN110778543B CN110778543B CN201911074867.0A CN201911074867A CN110778543B CN 110778543 B CN110778543 B CN 110778543B CN 201911074867 A CN201911074867 A CN 201911074867A CN 110778543 B CN110778543 B CN 110778543B
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- 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
- F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids
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- 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
- F15B1/26—Supply reservoir or sump assemblies
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- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- 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
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- 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)
- Compressor (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a pneumatic pressurization system of a hydraulic oil tank of engineering machinery, which comprises an air compressor, a reversing valve, a dryer, a regeneration air storage tank, an air storage tank, a pressure reducing valve, a hydraulic oil tank and an overflow valve, wherein the air compressor is connected with the reversing valve; the air compressor is connected with the prime motor and is driven by the prime motor; the reversing valve is connected between the outlet of the air compressor and the inlet of the dryer; the regeneration gas storage tank and the gas storage tank are respectively connected with the outlet of the dryer; the pressure reducing valve is connected between the air storage tank and the hydraulic oil tank; the overflow valve is installed on the hydraulic oil tank. The invention utilizes the Pascal principle, and improves the absolute atmospheric pressure in the oil tank by inputting compressed air into the hydraulic oil tank, thereby improving the pressure of an oil suction port of the hydraulic pump, avoiding the phenomenon of air suction and ensuring the normal use of engineering machinery in plateau areas.
Description
Technical Field
The invention relates to a pneumatic pressurization system of a hydraulic oil tank of engineering machinery, and belongs to the field of mechanical equipment.
Background
The large-scale engineering machinery is the main construction machinery in the earth and rockfill engineering construction of mines, and with the development of economy in China, the resource demand is continuously increased, and the development of mining resources in plateau areas needs to be vigorously developed. Large-scale engineering machinery comprises a hydraulic system, a hydraulic pump in the hydraulic system has large displacement, the self-suction capacity of the pump is relatively poor, and the suction phenomenon of the pump is easy to occur due to low atmospheric pressure in plateau. Research shows that 80% of hydraulic system faults are caused by system pollution, 16% of hydraulic system faults are caused by air suction, the air suction can cause cavitation of the hydraulic system, vibration and noise are aggravated, the service life of equipment is seriously influenced, and in order to enable the existing large-scale engineering machinery to meet the use requirement of a plateau area, the oil pumping pressure needs to be improved.
Disclosure of Invention
The invention utilizes the Pascal principle, and improves the air pressure in the oil tank through the pneumatic pressurization system, thereby improving the pressure of the oil suction port of the main pump and preventing the phenomenon of air suction.
In order to solve the technical problems, the technical implementation scheme of the invention is as follows:
a pneumatic pressurization system of a hydraulic oil tank of engineering machinery comprises an air compressor, a reversing valve, a dryer, a regeneration air storage tank, an air storage tank, a pressure reducing valve, a hydraulic oil tank and an overflow valve; the air compressor is connected with the prime mover and is driven by the prime mover; the reversing valve is connected between the outlet of the air compressor and the inlet of the dryer;
the regeneration gas storage tank and the gas storage tank are respectively connected with the outlet of the dryer; the pressure reducing valve is connected between the air storage tank and the hydraulic oil tank; the overflow valve is arranged on the hydraulic oil tank; wherein, the hydraulic oil tank is closed and is not communicated with the atmosphere; the air compressor sucks clean air, and the compressed air is conveyed to the dryer through the reversing valve and then is input into the air storage tank for storage; when the air pressure in the hydraulic oil tank is lower than the set value of the pressure reducing valve, the air storage tank inputs the air into the hydraulic oil tank until the air pressure in the hydraulic oil tank is increased to the set pressure; the liquid level in the hydraulic oil tank can change along with mechanical movement, and after the liquid level rises, gas in the hydraulic oil tank can be compressed, so that the air pressure rises, and the gas is discharged through the overflow valve.
Further, a pressure regulating system is arranged in the dryer; the pressure regulating system comprises a pilot valve and a main valve; when the pressure in the air storage tank reaches the cut-off pressure P2 of the pilot valve, the pilot valve is reversed, the main valve and the reversing valve are also reversed simultaneously, the gas flow direction is changed, and the air compressor is in an unloading state.
Further, the main valve is switched to communicate with the drying chamber in the dryer, and the gas in the regeneration gas tank is discharged to the atmosphere through the drying chamber and the main valve, and the moisture precipitated in the drying chamber is discharged together.
Furthermore, after the reversing valve is reversed, the air outlet of the reversing valve is communicated with the air inlet of the air compressor, so that air circulates in the air compressor, and the air compressor is in an idle state.
Furthermore, after the reversing valve is reversed, the air outlet of the reversing valve is communicated with the atmosphere, and compressed air is directly discharged into the atmosphere.
Further, after the air compressor is in an unloading state, the gas in the air storage tank can be consumed along with the continuous change of the hydraulic pressure in the hydraulic oil tank, the pressure is gradually reduced, when the pressure is reduced to the cut-in pressure P1 of the pilot valve of the dryer, the pilot valve is reset, the main valve and the reversing valve are also reset, and the air compressor continues to convey the compressed gas to the regeneration air storage tank and the air storage tank.
Furthermore, a one-way valve II is connected between a drying chamber and a gas storage tank in the dryer in series, and a regeneration gas storage tank is connected between the one-way valve II and the drying chamber.
Further, the air inlet of the air compressor is connected with an air suction filter for filtering air.
Furthermore, a one-way valve I is connected between the pressure reducing valve and the hydraulic oil tank in series and used for preventing gas from flowing backwards.
Further, a gas tank safety valve is installed on the gas storage tank, so that the pressure in the gas storage tank is prevented from being too high to protect the safety of personnel and equipment after a pressure adjusting system in the dryer breaks down.
The invention has the beneficial effects that:
the form of the prime motor is not limited, and an electric motor, a hydraulic motor or an engine and the like can be selected according to the actual condition of the original engineering machinery, so that the expansibility is very good;
the system adopts a pure mechanical control mode, does not need to additionally add an electrical control system, and has high universality and reliability and relatively low cost;
the unloading function can be realized by arranging the reversing valve at the outlet of the air compressor, and the air compressor is in an idle state and has low energy consumption; meanwhile, after the valve is reversed, the inlet and the outlet of the air compressor are communicated, and gas circulates only in the air compressor without being sucked from an air filter, so that the replacement period of the filter element can be prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 illustrates the principle of the pressing process of an air compressor, wherein air flows in the direction indicated by the arrow of the arrow line;
FIG. 2 illustrates the principle of the unloading process of the air compressor, with gas flowing in the direction indicated by the arrowed line arrows;
fig. 3 shows the principle of unloading the air compressor to the atmosphere.
The labels in the figure are: 1. an intake filter; 2. an air compressor; 3. a prime mover; 4. a diverter valve; 5. a dryer; 6. regenerating the gas storage tank; 7. a gas storage tank; 8. a gas tank safety valve; 9. a drain valve; 10. a gas tank pressure gauge; 11. a pressure reducing valve; 12. a one-way valve I; 13. an overflow valve; 14. a tank relief valve; 15. an oil tank pressure gauge; 16. and (4) deflating the valve.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the pneumatic pressurization system for the hydraulic oil tank of the engineering machinery mainly comprises an air suction filter 1, an air compressor 2, a reversing valve 4, a dryer 5, a regeneration air storage tank 6, an air storage tank 7, a pressure reducing valve 11, a hydraulic oil tank and an overflow valve 13. An air inlet of the air compressor 2 is connected with the air suction filter 1, and the air compressor 2 is connected with the prime motor 3 and driven by the prime motor 3; the reversing valve 4 is connected between the outlet of the air compressor 2 and the inlet of the dryer 5; the regeneration gas storage tank 6 and the gas storage tank 7 are respectively connected with the outlet of the dryer 5; the pressure reducing valve 11 is connected between the air storage tank 7 and the hydraulic oil tank; the relief valve 13 is mounted on the hydraulic tank.
The working principle is as follows: the invention utilizes the Pascal principle, and the hydraulic oil tank is closed and can not be directly communicated with the atmosphere. When the prime mover 3 is started, the system state is as shown in fig. 1, and air flows in the direction indicated by the arrow lines.
Firstly, air is sucked from an air filter 1, enters an air compressor 2 after being filtered, is further compressed and flows into a dryer 5 through a reversing valve 4; further, the drying agent in the dryer 5 analyzes most of water in the compressed air and outputs the dried compressed air; meanwhile, the dryer 5 integrates a pressure regulation function and comprises a pilot valve and a main valve, the pressure does not reach the cutting-off pressure P2 of the pilot valve, the pilot valve is in an initial state, the main valve is closed, gas flows to the gas storage tank 7 and the regeneration gas storage tank 6 respectively, and the pressure in the gas storage tank 7 is gradually increased; further, the compressed air is regulated by a pressure reducing valve 11, the pressure is reduced to the pressure required by the hydraulic oil tank, and the pressure is input into the hydraulic oil tank; the liquid level of the hydraulic oil tank can change along with the movement of the actuator, when the liquid level rises, air in the hydraulic oil tank can be compressed, the pressure can rise and exceed the set pressure of the pressure reducing valve 11, at the moment, the pressure reducing valve 11 is closed, and the gas transmission to the hydraulic oil tank is stopped; when the pressure rises to the set pressure of the overflow valve 13, the overflow valve 13 is opened to discharge the gas; further, when the liquid level drops again, the air pressure in the hydraulic oil tank can be reduced, and when the pressure is lower than the design value of the pressure reducing valve 11, the pressure reducing valve 11 is opened again to continue to convey air to the hydraulic oil tank; and the process is repeated in a reciprocating way.
The control mode is as follows: firstly, in the working process, the prime motor 3 is always in the running state, and the air compressor 2 exhausts air to the reversing valve 4; when the reversing valve 4 is in an initial state, compressed air is discharged to the dryer 5, after being processed by the dryer 5, the compressed air is simultaneously discharged to the regeneration air storage tank 6 and the air storage tank 7, the pressure in the two air tanks rises, when the pressure rises to the cut-off pressure P2 of the pilot valve on the dryer 5, the pilot valve reverses, the pressure in the air storage tank 7 is fed back to the main valve of the dryer and the reversing valve 4, and the two valves reverse, so that the following two effects are generated:
1) reversing a main valve of the dryer: the gas in the regeneration gas storage tank 6 is discharged out of the dryer 5 through a main valve, and the internal water vapor is discharged together;
2) reversing by a reversing valve: the inlet and outlet of the air compressor 2 are communicated, the air is stopped from being delivered to the air storage tank 7, and meanwhile, air suction is not needed, so that the load of the air suction filter 1 is reduced, and the filter element replacement period is prolonged.
It should be noted that the reversing valve can also be implemented according to the principle shown in fig. 3, in this case, the port of the reversing valve 3 is communicated with the atmosphere, and the air compressor 2 needs to suck air from the suction filter 1, which wastes the service life of the suction filter 1 and is not recommended.
After the air compressor 2 is in the unloading state, the gas in the air storage tank 7 can be consumed along with the continuous change of the hydraulic pressure in the hydraulic oil tank, the pressure is gradually reduced, when the pressure in the air storage tank 7 is reduced to the cut-in pressure P1 of the pilot valve of the dryer, the pilot valve is reset, the main valve of the dryer and the reversing valve 4 are reset, and the air compressor 2 continues to convey the compressed gas to the regeneration air storage tank 6 and the air storage tank 7.
The parameter requirements are as follows: a cut-in pressure (P1) < a cut-off pressure (P2) < a tank relief valve pressure (P);
the minimum oil suction pressure of the pump is less than the pressure of the pressure reducing valve and the local atmospheric pressure.
With continued reference to fig. 1, a check valve i 12 is connected in series between the pressure reducing valve 11 and the hydraulic oil tank for preventing gas from flowing backwards.
Install gas pitcher relief valve 8 on the gas holder 7, prevent that the pressure governing system in the desicator 5 from breaking down the back, the too high pressure in the gas holder 7 protects the safety of personnel and equipment.
The drain valve 9 is installed on the gas storage tank 7, water separated out in the gas storage tank 7 is discharged, corrosion of elements in the system is reduced, meanwhile, water is further reduced to enter the hydraulic oil tank, and emulsification of hydraulic oil is prevented.
And a gas tank pressure gauge 10 is arranged on the gas storage tank 7 and used for observing the pressure of the gas storage tank 7.
The hydraulic oil tank is provided with an oil tank safety valve 14, so that the pressure in the hydraulic oil tank is prevented from being too high after an overflow valve of the oil tank breaks down, and the safety of personnel and equipment is guaranteed.
The hydraulic oil tank is provided with an oil tank pressure gauge 15 for detecting the gas pressure in the oil tank.
And a deflation valve 16 is arranged at the position of the one-way valve I12, and after the system is overhauled or shut down, gas in the system is exhausted, so that accidents are prevented, and the safety of personnel and equipment is guaranteed.
In summary, a large-displacement plunger pump is often required in a hydraulic system of large-scale engineering machinery, the self-priming capability of the large-displacement plunger pump is poor, and meanwhile, the suction phenomenon is easily caused due to low atmospheric pressure in a plateau area. The air suction can cause cavitation in a hydraulic system, and aggravate vibration and noise, thereby greatly reducing the service life of elements. The invention utilizes the Pascal principle, and improves the absolute atmospheric pressure in the oil tank by inputting compressed air into the hydraulic oil tank, thereby improving the pressure of an oil suction port of the hydraulic pump, avoiding the phenomenon of air suction and ensuring the normal use of engineering machinery in plateau areas.
While the present application has been described with reference to exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (9)
1. The utility model provides a pneumatic turbocharging system of engineering machine tool hydraulic tank which characterized in that:
the system comprises an air compressor, a reversing valve, a dryer, a regeneration air storage tank, an air storage tank, a pressure reducing valve, a hydraulic oil tank and an overflow valve;
the air compressor is connected with the prime mover and is driven by the prime mover;
the reversing valve is connected between the outlet of the air compressor and the inlet of the dryer;
the regeneration gas storage tank and the gas storage tank are respectively connected with the outlet of the dryer;
the pressure reducing valve is connected between the air storage tank and the hydraulic oil tank;
the overflow valve is arranged on the hydraulic oil tank;
wherein, the hydraulic oil tank is closed and is not communicated with the atmosphere; the air compressor sucks clean air, and the compressed air is conveyed to the dryer through the reversing valve and then is input into the air storage tank for storage; when the air pressure in the hydraulic oil tank is lower than the set value of the pressure reducing valve, the air storage tank inputs the air into the hydraulic oil tank until the air pressure in the hydraulic oil tank is increased to the set pressure;
the liquid level in the hydraulic oil tank can change along with the mechanical movement, and when the liquid level rises, gas in the hydraulic oil tank can be compressed, so that the air pressure rises and is discharged through an overflow valve;
a pressure regulating system is arranged in the dryer; the pressure regulating system comprises a pilot valve and a main valve; when the pressure in the air storage tank reaches the cut-off pressure P2 of the pilot valve, the pilot valve is reversed, the main valve and the reversing valve are also reversed simultaneously, the gas flow direction is changed, and the air compressor is in an unloading state.
2. The pneumatic pressurization system for the hydraulic oil tank of the engineering machinery as claimed in claim 1, wherein:
after the main valve is reversed, the main valve is communicated with a drying chamber in the dryer, the gas in the regeneration gas storage tank is exhausted to the atmosphere through the drying chamber and the main valve, and the moisture precipitated in the drying chamber is exhausted together.
3. The pneumatic pressurization system for the hydraulic oil tank of the engineering machinery as claimed in claim 1, wherein:
after the reversing valve is reversed, the air outlet of the reversing valve is communicated with the air inlet of the air compressor, so that air circulates in the air compressor, and the air compressor is in an idle state.
4. The pneumatic pressurization system for the hydraulic oil tank of the engineering machinery as claimed in claim 1, wherein:
after the reversing valve is reversed, the air outlet of the reversing valve is communicated with the atmosphere, and compressed air is directly discharged into the atmosphere.
5. The pneumatic pressurization system for the hydraulic oil tank of the engineering machinery as claimed in claim 1, wherein:
after the air compressor is in an unloading state, gas in the air storage tank can be consumed along with the continuous change of hydraulic pressure in the hydraulic oil tank, the pressure is gradually reduced, when the pressure is reduced to the cut-in pressure P1 of the pilot valve of the dryer, the pilot valve is reset, the main valve and the reversing valve are also reset, and the air compressor continues to convey compressed gas to the regeneration air storage tank and the air storage tank.
6. The pneumatic pressurization system for the hydraulic oil tank of the engineering machinery as claimed in claim 1, wherein:
a one-way valve II is connected between a drying chamber and a gas storage tank in the dryer in series, and a regeneration gas storage tank is connected between the one-way valve II and the drying chamber.
7. The pneumatic pressurization system for the hydraulic oil tank of the engineering machinery as claimed in claim 1, wherein:
the air inlet of the air compressor is connected with the air suction filter for filtering air.
8. The pneumatic pressurization system for the hydraulic oil tank of the engineering machinery as claimed in claim 1, wherein:
and a one-way valve I is connected between the pressure reducing valve and the hydraulic oil tank in series and used for preventing gas from flowing backwards.
9. The pneumatic pressurization system for the hydraulic oil tank of the engineering machinery as claimed in claim 1, wherein:
the gas storage tank is provided with a gas tank safety valve, so that the pressure in the gas storage tank is prevented from being too high to protect the safety of personnel and equipment after a pressure adjusting system in the dryer breaks down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911074867.0A CN110778543B (en) | 2019-11-06 | 2019-11-06 | Pneumatic pressurization system for hydraulic oil tank of engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911074867.0A CN110778543B (en) | 2019-11-06 | 2019-11-06 | Pneumatic pressurization system for hydraulic oil tank of engineering machinery |
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| CN110778543A CN110778543A (en) | 2020-02-11 |
| CN110778543B true CN110778543B (en) | 2021-06-29 |
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| CN113958282A (en) * | 2021-10-08 | 2022-01-21 | 徐州徐工基础工程机械有限公司 | Pneumatic pressurizer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6253721B2 (en) * | 1981-05-29 | 1987-11-11 | Tokyo Shibaura Electric Co | |
| JPH08210537A (en) * | 1995-01-31 | 1996-08-20 | Toyooki Kogyo Co Ltd | Pressure control valve |
| CN104791308A (en) * | 2014-12-07 | 2015-07-22 | 郑清 | Design scheme of hydraulic oil tank supercharging device |
| CN106837896A (en) * | 2017-04-07 | 2017-06-13 | 北京机械设备研究所 | A kind of hydraulic oil container of simulated high altitude hypobaric |
| CN107013511A (en) * | 2017-05-19 | 2017-08-04 | 广东伊之密高速包装系统有限公司 | The pressurized fuel tank of injection machine |
| CN107934784A (en) * | 2017-11-24 | 2018-04-20 | 徐州重型机械有限公司 | A kind of fuel tank pressue device, control method and its crane |
-
2019
- 2019-11-06 CN CN201911074867.0A patent/CN110778543B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6253721B2 (en) * | 1981-05-29 | 1987-11-11 | Tokyo Shibaura Electric Co | |
| JPH08210537A (en) * | 1995-01-31 | 1996-08-20 | Toyooki Kogyo Co Ltd | Pressure control valve |
| CN104791308A (en) * | 2014-12-07 | 2015-07-22 | 郑清 | Design scheme of hydraulic oil tank supercharging device |
| CN106837896A (en) * | 2017-04-07 | 2017-06-13 | 北京机械设备研究所 | A kind of hydraulic oil container of simulated high altitude hypobaric |
| CN107013511A (en) * | 2017-05-19 | 2017-08-04 | 广东伊之密高速包装系统有限公司 | The pressurized fuel tank of injection machine |
| CN107934784A (en) * | 2017-11-24 | 2018-04-20 | 徐州重型机械有限公司 | A kind of fuel tank pressue device, control method and its crane |
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| CN110778543A (en) | 2020-02-11 |
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