CN112610545B - Hydraulic pulse system - Google Patents
Hydraulic pulse system Download PDFInfo
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- CN112610545B CN112610545B CN202011643318.3A CN202011643318A CN112610545B CN 112610545 B CN112610545 B CN 112610545B CN 202011643318 A CN202011643318 A CN 202011643318A CN 112610545 B CN112610545 B CN 112610545B
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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
- F15B1/02—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
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to the technical field of hydraulic pressure, in particular to a hydraulic pulse system, which comprises an oil tank; the variable oil supply assembly is communicated with the oil tank; an oil inlet of the reversing control valve is communicated with the variable oil supply assembly, and an oil outlet of the reversing control valve is communicated with the oil tank; the first tested element is communicated with the first control port of the reversing control valve; the second tested element is communicated with the second control port of the reversing control valve; the reversing driving assembly is used for driving the reversing control valve to reverse at a certain frequency, so that the first control port and the second control port are alternately communicated with an oil inlet of the reversing control valve and an oil outlet of the reversing control valve; the oil inlet oil path rigidity adjusting assembly is communicated with the variable oil supply assembly and is used for adjusting the rigidity of the oil inlet oil path; oil return oil circuit rigidity adjustment assembly. The invention can improve the pressure pulse frequency and the flexibility.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to a hydraulic pulse system.
Background
The hydraulic pulse is used as an important assessment means for the pressure resistance life of the pressure element and is widely used in the industrial fields of hydraulic pressure, petroleum, chemical engineering, power systems and the like. The level of capacity of a hydraulic pulse system often determines the adequacy and effectiveness of pressure element life assessment.
The existing hydraulic pulse systems in the industry at present mostly pay attention to the pressure of the system, the durability examination process of tested elements is accelerated by increasing the peak value of pulse pressure, the frequency of pressure pulses output by the system is limited by the reversing frequency of a supercharger, and taking a booster cylinder pulse system as an example, because the booster cylinder needs to be reversed and filled with liquid in each pulse period, the output pulse frequency is difficult to exceed 2Hz; in addition, the pulse flow is often limited by the discharge capacity of a pressurizing cavity of a pressurizing oil cylinder, the pressure build-up time and the pressure reduction time of the pressure pulse cannot be adjusted, the pressure build-up time and the pressure reduction time of the pressure pulse can be ensured only by matching the pressure-resistant cavity of the tested element, the leakage rate and the output flow and the discharge capacity of the pressurizing cavity of the pressurizing oil cylinder, and the flexibility is poor.
Therefore, a hydraulic pulse system is needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a hydraulic pulse system, which can improve the pressure pulse frequency and flexibility.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic pulse system, comprising:
an oil tank in which hydraulic oil is stored;
the variable oil supply assembly is communicated with the oil tank;
an oil inlet of the reversing control valve is communicated with the variable oil supply assembly, and an oil outlet of the reversing control valve is communicated with the oil tank;
the first element to be tested can be communicated with the first control port of the reversing control valve;
a second element to be tested can be communicated with a second control port of the reversing control valve;
the reversing driving assembly is used for driving the reversing control valve to reverse at a certain frequency, so that the first control port and the second control port are alternately communicated with an oil inlet of the reversing control valve and an oil outlet of the reversing control valve;
the oil inlet oil path rigidity adjusting assembly is communicated with the variable oil supply assembly and is used for adjusting the rigidity of the oil inlet oil path;
the oil return oil path rigidity adjusting assembly is communicated with an oil outlet of the reversing control valve and the oil tank and is used for adjusting the rigidity of the oil return oil path; the variable oil supply assembly comprises a variable frequency motor and a high-pressure pump, the variable frequency motor is in driving connection with the high-pressure pump, and the high-pressure pump is respectively communicated with the oil tank and the reversing control valve; the reversing driving assembly comprises a speed reducing motor and a transmission assembly, an output shaft of the speed reducing motor is in transmission connection with the transmission assembly, and the transmission assembly is connected with the reversing control valve.
Further, the transmission assembly comprises a driving gear and a driven gear, the driving gear is in transmission connection with the speed reducing motor, the driven gear is meshed with the driving gear, and the driven gear is connected with the reversing control valve.
Further, the output end of the speed reducing motor is connected with a speed reducer, and the output end of the speed reducer is connected with the driving gear.
Further, the oil inlet oil way rigidity adjusting assembly comprises a first throttle valve assembly, a first energy accumulator and an overflow valve, an oil inlet of the first throttle valve assembly is communicated with an oil outlet of the high-pressure pump, an oil outlet of the first throttle valve assembly is communicated with the first energy accumulator and the overflow valve respectively, and the overflow valve is communicated with the oil tank.
Further, the first throttle valve assembly comprises a first throttle valve and a first cycloid motor, the first cycloid motor is in driving connection with the first throttle valve and is used for controlling the opening degree of the first throttle valve, an oil inlet of the first throttle valve is communicated with an oil outlet of the high-pressure pump, and an oil outlet of the first throttle valve is communicated with the first accumulator and the overflow valve.
Further, the oil return path rigidity adjusting assembly comprises a second throttling valve assembly and a second energy accumulator, an oil inlet of the second throttling valve assembly is communicated with an oil outlet of the reversing control valve and the second energy accumulator, and an oil outlet of the second throttling valve assembly is communicated with the oil tank.
Further, the second throttle valve assembly comprises a second throttle valve and a second cycloid motor, the second cycloid motor is in driving connection with the second throttle valve and is used for controlling the opening degree of the second throttle valve, an oil inlet of the second throttle valve is communicated with an oil outlet of the reversing control valve and the second energy accumulator, and an oil outlet of the second throttle valve is communicated with the oil tank.
Further, the reversing control valve is a high-speed rotating valve.
The invention has the beneficial effects that:
according to the hydraulic pulse system provided by the invention, the variable oil supply component is communicated with the oil tank and the oil inlet of the reversing control valve, the first tested element is communicated with the first control port, the second tested element is communicated with the second control port, the oil outlet of the reversing control valve is communicated with the oil tank, the first control port or the second control port is controlled to be communicated with the oil inlet of the reversing control valve through the reversing control valve, and the reversing control valve is driven to reverse at a certain frequency through the reversing driving component, so that high-frequency pressure pulse is realized, and the time and energy consumption for checking the tested element are reduced; the oil supply is adjusted through the variable oil supply assembly, and the rigidity of the oil inlet passage is adjusted by arranging the oil inlet passage rigidity adjusting assembly to be communicated with the variable oil supply assembly so as to adjust the rigidity of the oil inlet passage and adjust the pressurization time; the rigidity adjusting assembly of the oil return path is communicated with the oil outlet and the oil tank and used for adjusting the rigidity of the oil return path and adjusting the pressure reduction time. Through the arrangement, the flexibility of the hydraulic pulse system can be improved; and two paths of independent high-voltage pulses are realized, and the output quantity and the utilization rate are greatly improved.
Drawings
FIG. 1 is a fluid circuit diagram of a hydraulic pulse system of the present invention.
In the figure:
1. an oil tank; 2. a variable oil supply assembly; 21. a high pressure pump; 22. a variable frequency motor; 3. a reversing control valve; 4. a first element under test; 5. a second element under test; 6. a commutation drive assembly; 61. a reduction motor; 62. a driving gear; 63. a driven gear; 7. an oil inlet oil path rigidity adjusting assembly; 71. a first accumulator; 72. an overflow valve; 73. a first gerotor motor; 74. a first throttle valve; 8. the rigidity adjusting assembly of the oil return way; 81. a second accumulator; 82. a second gerotor motor; 83. a second throttle valve.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In order to be able to increase the pressure pulse frequency and flexibility, the present invention provides a hydraulic pulse system, as shown in fig. 1. This hydraulic pulse system includes: the oil tank comprises an oil tank 1, a variable oil supply assembly 2, a reversing control valve 3, a reversing driving assembly 6, an oil inlet oil way rigidity adjusting assembly 7 and an oil return oil way rigidity adjusting assembly 8.
Hydraulic oil is stored in the oil tank 1; the variable oil supply assembly 2 is communicated with the oil tank 1; an oil inlet of the reversing control valve 3 is communicated with the variable oil supply assembly 2, and an oil outlet of the reversing control valve 3 is communicated with the oil tank 1; the first element under test 4 can communicate with the first control port of the directional control valve 3; the second element under test 5 can communicate with the second control port of the directional control valve 3; the reversing driving assembly 6 is used for driving the reversing control valve 3 to reverse at a certain frequency, so that the first control port and the second control port are alternately communicated with an oil inlet of the reversing control valve 3 and an oil outlet of the reversing control valve 3; the oil inlet oil way rigidity adjusting assembly 7 is communicated with the variable oil supply assembly 2 and is used for adjusting the rigidity of the oil inlet oil way; and the oil return path rigidity adjusting assembly 8 is communicated with the oil outlet of the reversing control valve 3 and the oil tank 1 and is used for adjusting the rigidity of the oil return path.
The first control port or the second control port is controlled by the reversing control valve 3 to be communicated with an oil inlet of the reversing control valve 3, and the reversing control valve 3 is driven by the reversing driving assembly 6 to reverse at a certain frequency, so that high-frequency pressure pulse is realized, and the time and energy consumption for examining a tested element are reduced; the variable oil supply assembly 2 is used for adjusting oil supply, and the oil inlet oil path rigidity adjusting assembly 7 is communicated with the variable oil supply assembly 2 so as to adjust the rigidity of the oil inlet oil path and adjust the pressurizing time; through setting up oil return oil circuit rigidity adjusting part 8, communicate with oil-out and oil tank 1 for adjust oil return oil circuit's rigidity, adjust when stepping down. Through the arrangement, the flexibility of the hydraulic pulse system can be improved; and two paths of independent high-voltage pulses are realized, and the output quantity and the utilization rate are greatly improved.
Further, the variable oil supply assembly 2 comprises a variable frequency motor 22 and a high-pressure pump 21, the variable frequency motor 22 is in driving connection with the high-pressure pump 21, and the high-pressure pump 21 is respectively communicated with the oil tank 1 and an oil inlet of the reversing control valve 3. By adopting the variable frequency motor 22, when the displacement of the high pressure pump 21 needs to be changed, only the frequency of the current needs to be adjusted, so that the adjustment of the oil supply amount is realized.
Further, the reversing drive assembly 6 comprises a speed reducing motor 61 and a transmission assembly, an output shaft of the speed reducing motor 61 is in transmission connection with the transmission assembly, and the transmission assembly is connected with the reversing control valve 3. In the present embodiment, the directional control valve 3 is a high-speed rotation valve. The high-speed rotary valve is driven by the speed reducing motor 61, so that the reversing of the reversing control valve 3 is realized, and two paths of independent high-pressure oil high-frequency pulses are alternately output; the frequency adjustment of the high-voltage pulses is achieved by controlling the rotational speed of the reduction motor 61.
Further, the transmission assembly comprises a driving gear 62 and a driven gear 63, the driving gear 62 is in transmission connection with the reduction motor 61, the driven gear 63 is meshed with the driving gear 62, and the driven gear 63 is connected with the reversing control valve 3. By adopting gear engagement transmission, the accurate transmission ratio is ensured, and the reliability of transmission is ensured. In other embodiments, belt drive, chain drive, etc. may be used, without limitation.
Further, an output end of the reduction motor 61 is connected to a reducer, and an output end of the reducer is connected to the driving gear 62. Through setting up the reduction gear, can carry out the deceleration to gear motor 61 and increase square to guarantee driven rigidity and stability.
Further, the oil inlet path rigidity adjusting assembly 7 comprises a first throttle valve assembly, a first accumulator 71 and a relief valve 72, an oil inlet of the first throttle valve assembly is communicated with an oil outlet of the high-pressure pump 21, an oil outlet of the first throttle valve assembly is respectively communicated with the first accumulator 71 and the relief valve 72, and the relief valve 72 is communicated with the oil tank 1. Wherein, the throttle opening of the first throttle valve assembly can be adjusted. The first accumulator 71 accumulates energy when the oil pressure output from the high-pressure pump 21 is high, and releases the accumulated energy when the oil pressure is low. The stored energy of the first energy accumulator 71 can be adjusted by adjusting the opening of the first throttle valve assembly, so that the rigidity of the oil inlet passage can be flexibly adjusted, and the flexibility of the oil inlet passage and the adaptability of the tested element are improved. The pressure of the hydraulic pulse system is adjusted by arranging the overflow valve 72, so that the stability of the hydraulic pulse system is ensured.
Further, the first throttle valve assembly includes a first throttle valve 74 and a first cycloid motor 73, the first cycloid motor 73 is in driving connection with the first throttle valve 74 for controlling the opening degree of the first throttle valve 74, the oil inlet of the first throttle valve 74 is communicated with the oil outlet of the high-pressure pump 21, and the oil outlet of the first throttle valve 74 is communicated with both the first accumulator 71 and the relief valve 72. The stored energy of the first accumulator 71 can be adjusted by adjusting the opening of the first throttle valve 74 by adjusting the first gerotor motor 73.
Similarly, the oil return path rigidity adjusting assembly 8 comprises a second throttle valve assembly and a second accumulator 81, an oil inlet of the second throttle valve assembly is communicated with an oil outlet of the reversing control valve 3 and the second accumulator 81, and an oil outlet of the second throttle valve assembly is communicated with the oil tank 1. The second accumulator 81 stores energy when the oil pressure output from the oil outlet of the directional control valve 3 is high, and releases the stored energy when the oil pressure is low. The stored energy of the second energy accumulator 81 can be adjusted by adjusting the opening of the second throttle valve assembly, so that the rigidity of the oil return path can be flexibly adjusted, and the flexibility of the oil return path and the adaptability of the tested element are improved.
Further, the second throttle valve assembly comprises a second throttle valve 83 and a second cycloid motor 82, the second cycloid motor 82 is in driving connection with the second throttle valve 83 and is used for controlling the opening degree of the second throttle valve 83, the oil inlet of the second throttle valve 83 is communicated with the oil outlet of the reversing control valve 3 and the second accumulator 81, and the oil outlet of the second throttle valve 83 is communicated with the oil tank 1. The opening degree of the second throttle valve 83 can be adjusted by adjusting the second gerotor motor 82, thereby adjusting the stored energy of the second accumulator 81.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A hydraulic pulse system, comprising:
an oil tank (1) in which hydraulic oil is stored;
the variable oil supply assembly (2) is communicated with the oil tank (1);
an oil inlet of the reversing control valve (3) is communicated with the variable oil supply assembly (2), and an oil outlet of the reversing control valve (3) is communicated with the oil tank (1);
the first element to be tested (4) is communicated with a first control port of the reversing control valve (3);
the second element to be tested (5) is communicated with a second control port of the reversing control valve (3);
the reversing driving assembly (6) is used for driving the reversing control valve (3) to reverse at a certain frequency, so that the first control port and the second control port are alternately communicated with an oil inlet of the reversing control valve (3) and an oil outlet of the reversing control valve (3);
the oil inlet oil path rigidity adjusting assembly (7) is communicated with the variable oil supply assembly (2) and is used for adjusting the rigidity of the oil inlet oil path;
the oil return oil path rigidity adjusting assembly (8) is communicated with an oil outlet of the reversing control valve (3) and the oil tank (1) and is used for adjusting the rigidity of an oil return oil path;
the variable oil supply assembly (2) comprises a variable frequency motor (22) and a high-pressure pump (21), the variable frequency motor (22) is in driving connection with the high-pressure pump (21), and the high-pressure pump (21) is communicated with the oil tank (1) and the reversing control valve (3) respectively;
the reversing driving assembly (6) comprises a speed reducing motor (61) and a transmission assembly, an output shaft of the speed reducing motor (61) is in transmission connection with the transmission assembly, and the transmission assembly is connected with the reversing control valve (3).
2. The hydraulic pulse system as claimed in claim 1, wherein the transmission assembly comprises a driving gear (62) and a driven gear (63), the driving gear (62) is in transmission connection with the reduction motor (61), the driven gear (63) is meshed with the driving gear (62), and the driven gear (63) is connected with the reversing control valve (3).
3. A hydraulic impulse system according to claim 2, characterized in, that the output of the gear motor (61) is connected to a reducer, the output of which is connected to the driving gear (62).
4. A hydraulic impulse system according to claim 1, characterized in that said oil inlet circuit rigidity adjustment assembly (7) comprises a first throttle valve assembly, a first accumulator (71) and a relief valve (72), the oil inlet of said first throttle valve assembly being in communication with the oil outlet of said high-pressure pump (21), the oil outlet of said first throttle valve assembly being in communication with said first accumulator (71) and said relief valve (72), respectively, said relief valve (72) being in communication with said oil tank (1).
5. A hydraulic pulse system according to claim 4, characterized in that said first throttle valve assembly comprises a first gerotor motor (73) and a first throttle valve (74), said first gerotor motor (73) being drivingly connected with said first throttle valve (74) for controlling the opening of said first throttle valve (74), the oil inlet of said first throttle valve (74) being in communication with the oil outlet of said high-pressure pump (21), the oil outlet of said first throttle valve (74) being in communication with both said first accumulator (71) and said spill valve (72).
6. A hydraulic impulse system according to claim 1, characterized in that said oil return stiffness adjustment assembly (8) comprises a second throttle valve assembly and a second accumulator (81), the oil inlet of said second throttle valve assembly communicating with the oil outlet of said reversing control valve (3) and with said second accumulator (81), the oil outlet of said second throttle valve assembly communicating with said oil tank (1).
7. A hydraulic pulse system according to claim 6, wherein said second throttle valve assembly comprises a second gerotor motor (82) and a second throttle valve (83), said second gerotor motor (82) being drivingly connected to said second throttle valve (83) for controlling the opening of said second throttle valve (83), the oil inlet of said second throttle valve (83) being in communication with the oil outlet of said reversing control valve (3) and said second accumulator (81), and the oil outlet of said second throttle valve (83) being in communication with said oil tank (1).
8. A hydraulic impulse system as claimed in claim 1, characterized in, that said reversing control valve (3) is a high-speed reversing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011643318.3A CN112610545B (en) | 2020-12-30 | 2020-12-30 | Hydraulic pulse system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011643318.3A CN112610545B (en) | 2020-12-30 | 2020-12-30 | Hydraulic pulse system |
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| CN112610545A CN112610545A (en) | 2021-04-06 |
| CN112610545B true CN112610545B (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011643318.3A Active CN112610545B (en) | 2020-12-30 | 2020-12-30 | Hydraulic pulse system |
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| CN106593970A (en) * | 2016-12-09 | 2017-04-26 | 柳州职业技术学院 | Fatigue test hydraulic loading device for rigid material |
| CN109611389A (en) * | 2018-11-20 | 2019-04-12 | 柳州柳工液压件有限公司 | The hydraulic circuit of check valve durability test |
| CN110273865A (en) * | 2019-07-24 | 2019-09-24 | 山河智能装备股份有限公司 | The gentle regulating device of variable displacement motor discharge capacity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6971463B2 (en) * | 2002-12-23 | 2005-12-06 | Cnh America Llc | Energy recovery system for work vehicle including hydraulic drive circuit and method of recovering energy |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101413523A (en) * | 2008-11-14 | 2009-04-22 | 浙江大学 | Independent energy accumulator energy recovery hydraulic system of engineering machinery load port |
| CN202707641U (en) * | 2012-07-12 | 2013-01-30 | 三一重工股份有限公司 | Energy recovery hydraulic system and concrete conveying pump |
| CN104033430A (en) * | 2014-06-05 | 2014-09-10 | 浙江大学 | TBM experiment table thrust hydraulic system capable of conforming sudden-change load |
| CN104088857A (en) * | 2014-07-09 | 2014-10-08 | 浙江三一装备有限公司 | Hydraulic motor overspeed reliability test system |
| CN105156397A (en) * | 2015-08-18 | 2015-12-16 | 安庆联动属具股份有限公司 | Hydraulic valve loop with sequential control function |
| CN105697439A (en) * | 2016-04-25 | 2016-06-22 | 新兴能源装备股份有限公司 | Oil-way reversing device for CNG hydraulic substation during zero-pressure oil supply |
| CN106593970A (en) * | 2016-12-09 | 2017-04-26 | 柳州职业技术学院 | Fatigue test hydraulic loading device for rigid material |
| CN109611389A (en) * | 2018-11-20 | 2019-04-12 | 柳州柳工液压件有限公司 | The hydraulic circuit of check valve durability test |
| CN110273865A (en) * | 2019-07-24 | 2019-09-24 | 山河智能装备股份有限公司 | The gentle regulating device of variable displacement motor discharge capacity |
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| CN112610545A (en) | 2021-04-06 |
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |