CN105443462A - Two-way output hybrid hydraulic power system - Google Patents
Two-way output hybrid hydraulic power system Download PDFInfo
- Publication number
- CN105443462A CN105443462A CN201410394307.4A CN201410394307A CN105443462A CN 105443462 A CN105443462 A CN 105443462A CN 201410394307 A CN201410394307 A CN 201410394307A CN 105443462 A CN105443462 A CN 105443462A
- Authority
- CN
- China
- Prior art keywords
- hydraulic pump
- oil
- hydraulic
- oil path
- outlet
- 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.)
- Pending
Links
- 239000003921 oil Substances 0.000 claims abstract description 145
- 230000009977 dual effect Effects 0.000 claims abstract description 29
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 21
- 239000010729 system oil Substances 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims 3
- 238000009825 accumulation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a two-way output hybrid hydraulic power system. The two-way output hybrid hydraulic power system comprises an oil tank, at least one electric hydraulic pump connected with the oil tank and capable of absorbing hydraulic oil outputted in pressurized mode, at least one mechanical hydraulic pump connected with the oil tank and capable of absorbing hydraulic oil outputted in pressurized mode, at least two sequential check valves connected with the electric hydraulic pump and the mechanical hydraulic pump, and one dual pressure valve connected with the oil tank and all sequential check valves in order to transfer the direction of hydraulic output. All the sequential check valves are kept open in the first direction and at the non-return state in the second direction.Therefore, all the sequential check valves can be kept open towards the direction of the electric hydraulic pump. While, the mechanical hydraulic pump is at the non-return state in the second direction so that pressure storage is avoided so that the electric hydraulic pump can output and move. During power input of the mechanical hydraulic pump, all the sequential check valves are pushed to not return from the direction of the electric hydraulic pump such that directions can be easily changed by avoiding pressure storage of oil channels during two-way dual-power output. The function of two-way hydraulic and dual-power hybrid hydraulic output is fulfilled.
Description
Technical Field
The invention relates to a two-way output hybrid hydraulic power system innovation, in particular to a hybrid hydraulic power system innovation which can avoid unsmooth reversing caused by pressure accumulation of an oil way during two-way double-power output and further achieve the effect of performing two-way hydraulic and double-power hybrid hydraulic output.
Background
A known hydraulic power output system (shown in fig. 3) including a mechanical hydraulic pump 70, an electric hydraulic pump 71, a relief valve 72, a check valve 73, and an oil tank 74; the mechanical hydraulic pump 70 is powered by manpower to suck and pressurize hydraulic oil, the electric hydraulic pump 71 is powered by an electric motor and can suck and pressurize hydraulic oil (unidirectional output), the pressure relief valve 72 can release pressure when the set pressure is exceeded, the check valve 73 prevents backflow of hydraulic oil, the oil tank 74 stores and provides hydraulic oil for the pump, and when the hydraulic power output system is operated, the outlet ends of the mechanical hydraulic pump 70 and the electric hydraulic pump 71 are both provided with check valves 73 to prevent backflow of hydraulic oil from the other pump when either pump is operated, so that the two pumps can perform hydraulic output of hybrid power.
Another known hydraulic power output system (as shown in fig. 4) includes a dual pressure valve 80, an electric hydraulic pump 81, a relief valve 82, a check valve 83, and an oil tank 84; when the hydraulic power output system is actuated, referring to a unidirectional power hybrid output mode, the outlet end of the electric hydraulic pump 81 is matched with the check valve 83 to perform bidirectional output, after pressurization is performed in the first direction, the oil pipe expands and accumulates pressure due to the existence of hydraulic oil in the check valve 83, the generated oil pressure is accumulated in the oil circuit, the double pressure valve 80 of the oil return circuit is pushed to the right, the pressurization direction is converted into the second direction for pressurization, the oil return circuit in the second direction is always kept in an open state by the double pressure valve 80, the oil pressure directly returns to the oil tank 84 through the oil return circuit path on the right side to be incapable of pressurization, and the shortcoming that the reversing driving is incapable of being performed due to the formation of pressure accumulation is caused.
Disclosure of Invention
The invention aims to provide a two-way output hybrid hydraulic power system, which can make each sequence check valve keep normally open towards the direction of an electric hydraulic pump, and check towards the direction of a mechanical hydraulic pump, so that the pressure accumulation phenomenon is avoided, and the electric hydraulic pump can output motion.
To achieve the above object, the present invention is a bidirectional output hybrid hydraulic power system, comprising: an oil tank for storing hydraulic oil; at least one electric hydraulic pump connected with the oil tank and capable of sucking and outputting pressurized hydraulic oil; at least one mechanical hydraulic pump connected with the oil tank and capable of sucking and outputting pressurized hydraulic oil; at least two sequential check valves respectively connected with the electric hydraulic pump and the mechanical hydraulic pump, wherein the first direction of each sequential check valve is kept normally open, and the second direction is non-return; and a dual pressure valve connecting the oil tank and each sequential check valve for switching the direction of the hydraulic output.
In one embodiment of the present invention, a motor is connected to the electric hydraulic pump, and the motor can drive the electric hydraulic pump in a clockwise or counterclockwise direction.
In an embodiment of the present invention, the electric hydraulic pump has at least two electric hydraulic pump oil path outlets in different directions, the mechanical hydraulic pump at least includes a mechanical hydraulic pump outlet, the dual pressure valve at least includes an oil path inlet and an oil return port of the dual pressure valve, the electric hydraulic pump oil path outlets, the mechanical hydraulic pump outlet and the oil path inlet of the dual pressure valve are respectively connected to the sequential check valves, and the oil return port of the dual pressure valve is connected to the oil tank.
In an embodiment of the present invention, each sequential check valve includes a first oil path inlet connected to an oil path outlet of each electric hydraulic pump, a second oil path inlet connected to an outlet of the mechanical hydraulic pump, and a common oil path outlet connected to an oil path inlet of the dual pressure valve.
In an embodiment of the present invention, when the mechanical hydraulic pump is not operated, the first oil path inlet of each sequential check valve is normally open, and therefore, the first oil path inlet is communicated with the common oil path outlet; when the mechanical hydraulic pump is operated, the first oil path inlet is sealed, and the second oil path inlet is communicated with the common oil path outlet.
In an embodiment of the present invention, each sequential check valve is provided therein with an elastic element, so that the first oil inlet is kept normally open by the elastic element when the mechanical hydraulic pump is not operated.
In an embodiment of the present invention, the mechanical hydraulic pump is further connected to a manual directional valve, and the manual directional valve includes a directional oil path inlet connected to the outlet of the mechanical hydraulic pump, a directional oil path outlet respectively connected to the second oil path inlets of the sequential check valves, and a manual controller selectively connecting the directional oil path outlet to the directional oil path inlet.
In an embodiment of the present invention, the common oil path outlet of each sequential check valve and the oil path inlet of the dual pressure valve may be further connected to an external hydraulic system.
In an embodiment of the present invention, the external hydraulic system has a system oil path interface connected to the common oil path outlet and the dual pressure valve oil path inlet.
In an embodiment of the present invention, the dual pressure valve further has a system low pressure oil return port connected to the external hydraulic system, and the system low pressure oil return port is connected to the oil return port of the dual pressure valve to provide a path for the external hydraulic system to flow back to the oil tank through the mechanism gap.
In an embodiment of the present invention, the system oil path interface is connected to at least two pressure relief valves, and each pressure relief valve has at least one pressure relief inlet connected to the system oil path interface and at least one pressure relief outlet connected to the oil tank.
The invention can make each sequence check valve keep normally open towards the direction of the electric hydraulic pump, and stop towards the direction of the mechanical hydraulic pump, so as not to generate pressure accumulation phenomenon, and make the electric hydraulic pump output to actuate, when the power of the mechanical hydraulic pump is input, each sequence check valve is pushed to stop towards the direction of the electric hydraulic pump, so as to avoid the unsmooth reversing caused by the pressure accumulation of the oil circuit during the two-way double-power output, and further achieve the efficacy of performing the two-way hydraulic and double-power mixed hydraulic output.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,
FIG. 1 is a schematic diagram of the basic architecture of the present invention.
Fig. 2 is a schematic view of the usage state of the present invention.
Fig. 3 is a schematic diagram illustrating a conventional usage state.
Fig. 4 is a schematic diagram of another conventional usage state.
The reference numbers illustrate:
(part of the invention)
1 oil tank
2 electric hydraulic pump
21 Motor
22 electric hydraulic pump oil path outlet
3 mechanical hydraulic pump
31 mechanical hydraulic pump outlet
32 hand-operated direction valve
321 reversing oil way inlet
322 reversing oil way outlet
323 manual controller
4-sequence check valve
41 first oil path inlet
42 second oil path inlet
43 common oil passage outlet
5 double pressure valve
51 double pressure valve first oil path inlet
51a double pressure valve second oil inlet
52 oil return interface
53 low-pressure oil return interface of system
6 external hydraulic system
60 pressure relief valve
601 pressure relief inlet
602 pressure relief vent
61 oil way interface of system
(publicly known section)
70 mechanical hydraulic pump
71 electric hydraulic pump
72 pressure relief valve
73 check valve
74 oil tank
80 double pressure valve
81 electric hydraulic pump
82 pressure relief valve
83 check valve
84 oil tank
Detailed Description
Please refer to fig. 1, which is a schematic diagram of the basic architecture of the present invention. As shown in the figure: the invention relates to a bidirectional output hybrid hydraulic power system, which at least comprises an oil tank 1, at least one electric hydraulic pump 2, at least one mechanical hydraulic pump 3, at least two sequential check valves 4 and a double-pressure valve 5.
The oil tank 1 stores hydraulic oil.
The electric hydraulic pump 2 is connected to the oil tank 1, and a motor 21 is connected to the electric hydraulic pump 2, and the motor 21 can drive the electric hydraulic pump 2 in a clockwise or counterclockwise direction, so that the electric hydraulic pump 2 can suck the hydraulic oil in the pressurized output oil tank 1.
The mechanical hydraulic pump 3 is connected with the oil tank 1 and can suck and pressurize hydraulic oil in the output oil tank 1.
The sequential check valves 4 are connected to the electric hydraulic pump 2 and the mechanical hydraulic pump 3, respectively, and the first direction (the direction of the electric hydraulic pump 2) of the sequential check valves 4 is maintained normally open, and the second direction thereof is non-return (the direction of the mechanical hydraulic pump 3).
The double pressure valve 5 connects the oil tank 1 and each sequential check valve 4, and switches the direction of hydraulic pressure output.
Fig. 2 is a schematic diagram illustrating a usage status of the present invention. As shown in the figure: the electric hydraulic pump 2 of the invention is provided with at least two electric hydraulic pump oil path outlets 22 with different directions, the mechanical hydraulic pump 3 at least comprises a mechanical hydraulic pump outlet 31, the double pressure valve 5 at least comprises a double pressure valve first oil path inlet 51, a double pressure valve second oil path inlet 51a and an oil return interface 52, each electric hydraulic pump oil path outlet 22, a mechanical hydraulic pump outlet 31 and a double pressure valve first oil path inlet 51, the double pressure valve second oil path inlet 51a are respectively connected with each sequential check valve 4, the oil return interface 52 of the double pressure valve 5 is connected with the oil tank 1, each sequential check valve 4 respectively comprises a first oil path inlet 41 connected with each electric hydraulic pump oil path outlet 22, a second oil path inlet 42 connected with the mechanical hydraulic pump outlet 31, and a common oil path outlet 43 connected with the double pressure valve first oil path inlet 51 and the double pressure valve second oil path inlet 51a, the mechanical hydraulic pump 3 is further connected with a manual reversing valve 32, the manual reversing valve 32 is provided with a reversing oil path inlet 321 connected with the mechanical hydraulic pump outlet 31, a reversing oil path outlet 322 respectively connected with the second oil path inlets 42 arranged on the sequence check valves 4, and a manual controller 323 capable of selectively connecting the reversing oil path outlet 322 with the reversing oil path inlet 321, wherein the common oil path outlet 43 of the sequence check valves 4, the first oil path inlet 51 and the second oil path inlet 51a of the double pressure valve 5 can be further connected with an external hydraulic system 6, the external hydraulic system 6 is provided with a system oil path interface 61 connected with the common oil path outlet 43, the first oil path inlet 51 and the second oil path inlet 51a of the double pressure valve 5, the double pressure valve 5 is further provided with a system low-pressure oil return interface 53 connected with the external hydraulic system 6, the system low-pressure oil return interface 53 is connected with an oil return interface 52 of the double pressure valve 5, in addition, the system oil path interface 61 is connected with at least two pressure relief valves 60, and each pressure relief valve 60 is provided with at least one pressure relief inlet 601 connected with the system oil path interface 61 and at least one pressure relief outlet 602 connected with the oil tank 1.
After the connection is completed, the invention can utilize the cooperation of the oil tank 1, the electric hydraulic pump 2, the mechanical hydraulic pump 3, the manual reversing valve 32, the sequential check valve 4, the double pressure valve 5, the external hydraulic system 6 and the pressure relief valve 60 to perform the required operation by the electric hydraulic pump 2, the mechanical hydraulic pump 3 and the manual reversing valve 32, and in the operation process, if the sequential check valve 4 does not operate the mechanical hydraulic pump 3, the first oil path inlet 41 is kept normally open towards the electric hydraulic pump 2 and is not returned towards the mechanical hydraulic pump 3, therefore, the first oil path inlet 41 and the common oil path outlet 43 are kept communicated, the pressure accumulation phenomenon cannot be generated, and the electric hydraulic pump 2 can be driven and output; on the contrary, when the mechanical hydraulic pump 3 is operated by inputting power, the first oil path inlet 41 is closed, and the second oil path inlet 42 is communicated with the common oil path outlet 43, so that each sequential check valve 4 is stopped in the direction of the electric hydraulic pump 3, wherein each sequential check valve 4 is provided with an elastic element, and the first oil path inlet 41 is kept normally open by the elastic element when the mechanical hydraulic pump 3 is not operated.
When the hydraulic oil is output from the first direction (i.e. the left side of the electric hydraulic pump 2 in fig. 2), the dual pressure valve 5 is pushed to close the dual pressure valve first oil passage inlet 51 of the dual pressure valve 5, and the dual pressure valve second oil passage inlet 51a is in an open state, after the hydraulic oil is output to the external oil passage, the hydraulic oil flows back through the dual pressure valve second oil passage inlet 51a to form a complete loop, and when the hydraulic output direction is switched, the dual pressure valve first oil passage inlet 51 of the dual pressure valve 5 and the dual pressure valve second oil passage inlet 51a are switched in the opening direction, that is, the hydraulic output direction can be switched.
In summary, the hybrid hydraulic power system with two-way output of the present invention effectively improves the known defects, can make each sequential check valve keep normally open in the direction of the electric hydraulic pump, and stop in the direction of the mechanical hydraulic pump, so as to avoid pressure accumulation, so as to make the electric hydraulic pump output.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A bi-directional output hybrid hydraulic power system, comprising:
the oil tank is used for storing hydraulic oil;
the at least one electric hydraulic pump is connected with the oil tank and can suck the pressurized output hydraulic oil;
the mechanical hydraulic pump is connected with the oil tank and can suck the pressurized output hydraulic oil;
at least two sequential check valves respectively connected with the electric hydraulic pump and the mechanical hydraulic pump, wherein the first direction of each sequential check valve is kept normally open, and the second direction is in check; and
and a double-pressure valve which is connected with the oil tank and each sequential check valve and can convert the direction of hydraulic output.
2. A bi-directional output hybrid hydraulic power system as set forth in claim 1 wherein a motor is connected to said electric hydraulic pump, said motor being capable of driving said electric hydraulic pump in either a clockwise or counterclockwise direction.
3. A bi-directional output hybrid hydraulic power system as set forth in claim 1, wherein said electric hydraulic pump has at least two electric hydraulic pump oil path outlets in different directions, and said mechanical hydraulic pump includes at least one mechanical hydraulic pump outlet, and said dual pressure valve includes at least an oil path inlet and an oil return port of the dual pressure valve, and the oil path outlet of each electric hydraulic pump, the mechanical hydraulic pump outlet and the oil path inlet of the dual pressure valve are connected to each sequential check valve, respectively, and the oil return port of the dual pressure valve is connected to the oil tank.
4. A bi-directional output hybrid hydraulic power system as set forth in claim 3 wherein each of said sequential check valves includes a first hydraulic line inlet connected to an hydraulic line outlet of each of the electric hydraulic pumps, a second hydraulic line inlet connected to an outlet of the mechanical hydraulic pump, and a common hydraulic line outlet connected to an hydraulic line inlet of the dual pressure valve.
5. A bi-directional output hybrid hydraulic power system as set forth in claim 4 wherein each of said sequential check valves is normally open at a first fluid passage inlet when the mechanical hydraulic pump is not operating, whereby said first fluid passage inlet is in communication with the common fluid passage outlet; when the mechanical hydraulic pump is operated, the first oil path inlet is sealed, and the second oil path inlet is communicated with the common oil path outlet.
6. A bi-directional output hybrid hydraulic power system as set forth in claim 4 wherein each of said sequential check valves has a resilient member disposed therein for maintaining the first oil passage inlet thereof normally open when the mechanical hydraulic pump is not operated.
7. A bi-directional output hybrid hydraulic power system as set forth in claim 4 wherein said mechanical hydraulic pump is further connected to a manual directional control valve having a directional oil path inlet connected to the outlet of the mechanical hydraulic pump, a directional oil path outlet connected to the second oil path inlets of the respective sequential check valves, and a manual controller capable of selectively connecting the directional oil path outlet to the directional oil path inlet.
8. A bi-directional output hybrid hydraulic power system as set forth in claim 4 wherein the common oil path outlet of each of said sequential check valves and the oil path inlet of the dual pressure valve are further connectable to an external hydraulic system.
9. A bi-directional output hybrid hydraulic power system as set forth in claim 8 wherein said external hydraulic system has a system oil path interface connected to a common oil path outlet and a dual pressure valve oil path inlet.
10. A bi-directional output hybrid hydraulic power system as set forth in claim 8 wherein said dual pressure valve further has a system low pressure return port connected to the external hydraulic system and said system low pressure return port is connected to the return port of the dual pressure valve to provide a path for leakage of hydraulic oil from the external hydraulic system through the mechanism gap to flow back to the tank.
11. A bi-directional output hybrid hydraulic power system as set forth in claim 9 wherein at least two pressure relief valves are connected to said system oil path interface, each pressure relief valve having at least one pressure relief inlet connected to said system oil path interface and at least one pressure relief outlet connected to said oil tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410394307.4A CN105443462A (en) | 2014-08-12 | 2014-08-12 | Two-way output hybrid hydraulic power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410394307.4A CN105443462A (en) | 2014-08-12 | 2014-08-12 | Two-way output hybrid hydraulic power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105443462A true CN105443462A (en) | 2016-03-30 |
Family
ID=55554005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410394307.4A Pending CN105443462A (en) | 2014-08-12 | 2014-08-12 | Two-way output hybrid hydraulic power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105443462A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102639A (en) * | 1986-06-11 | 1987-12-23 | 株式会社岛津制作所 | Hydraulic system |
| CN1323956A (en) * | 2001-07-13 | 2001-11-28 | 陈荣明 | Power-saving energy-accumulating hydraulic power system |
| JP2003148412A (en) * | 2001-11-08 | 2003-05-21 | Tokimec Inc | Hydraulic control system |
| CN1971068A (en) * | 2005-10-28 | 2007-05-30 | 贺尔碧格自动化技术控股有限公司 | Hydraulic pressure supply unit and electro-hydraulic work unit |
| CN101408108A (en) * | 2008-11-11 | 2009-04-15 | 浙江大学 | Shield cutter head hydraulic system driven bymixed motor serial connection and parallel connection |
| CN101929489A (en) * | 2009-06-26 | 2010-12-29 | 安钛医疗设备股份有限公司 | Two-way oil hydraulic system of operating table |
| CN102245911A (en) * | 2009-07-10 | 2011-11-16 | 萱场工业株式会社 | Control device for hybrid construction machine |
| CN103556669A (en) * | 2013-10-15 | 2014-02-05 | 徐州徐工挖掘机械有限公司 | Swing energy recovery control device of hydraulic excavator |
-
2014
- 2014-08-12 CN CN201410394307.4A patent/CN105443462A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102639A (en) * | 1986-06-11 | 1987-12-23 | 株式会社岛津制作所 | Hydraulic system |
| CN1323956A (en) * | 2001-07-13 | 2001-11-28 | 陈荣明 | Power-saving energy-accumulating hydraulic power system |
| JP2003148412A (en) * | 2001-11-08 | 2003-05-21 | Tokimec Inc | Hydraulic control system |
| CN1971068A (en) * | 2005-10-28 | 2007-05-30 | 贺尔碧格自动化技术控股有限公司 | Hydraulic pressure supply unit and electro-hydraulic work unit |
| CN101408108A (en) * | 2008-11-11 | 2009-04-15 | 浙江大学 | Shield cutter head hydraulic system driven bymixed motor serial connection and parallel connection |
| CN101929489A (en) * | 2009-06-26 | 2010-12-29 | 安钛医疗设备股份有限公司 | Two-way oil hydraulic system of operating table |
| CN102245911A (en) * | 2009-07-10 | 2011-11-16 | 萱场工业株式会社 | Control device for hybrid construction machine |
| CN103556669A (en) * | 2013-10-15 | 2014-02-05 | 徐州徐工挖掘机械有限公司 | Swing energy recovery control device of hydraulic excavator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9695840B2 (en) | Reversible hydraulic pressure converter employing tubular valves | |
| CN102481689B (en) | Hydraulic press unit | |
| CN103620233B (en) | For the hydraulic control valve of construction plant | |
| US20160327157A1 (en) | Fluid arrangement | |
| KR20070046015A (en) | Hydraulic pressure suply unit and elctro-hydraulic actuating unit | |
| CN109779987A (en) | Sweeping machine and its fluid power system | |
| CN209781327U (en) | Electrohydraulic control multi-way valve | |
| CN102588373A (en) | Engineering machinery and leg hydraulic control device thereof | |
| CN102734241B (en) | Opened and closed hydraulic system and engineering machinery | |
| WO2019080699A1 (en) | Grease pumping device | |
| CN102887432A (en) | Electro-hydraulic integrated driver for rotary pin of container hanging tool | |
| KR101769644B1 (en) | Multiple fluid pump combination circuit | |
| CN105443462A (en) | Two-way output hybrid hydraulic power system | |
| CN209943015U (en) | Booster pump | |
| CN102900718A (en) | Changeover valve device for hydraulic system and hydraulic system for crawler crane | |
| US7788914B2 (en) | Apparatus operating hydraulic actuator for valve | |
| CN111442004A (en) | Supercharging device, hydraulic system and engineering mechanical equipment | |
| CN104675772B (en) | Load sensitive control hydraulic system | |
| TWI541443B (en) | Bidirectional output of hybrid hydraulic power system | |
| CN210769173U (en) | Booster pump | |
| CN214499595U (en) | Valveless reversing device | |
| WO2019080698A1 (en) | Grease pump | |
| CN114001070A (en) | Hydraulic control pipeline and device for double-acting oil cylinder | |
| CN105508329B (en) | Pumping hydraulic control system and concrete pumping equipment | |
| CN217002510U (en) | Hydraulic control pipeline and device for double-acting oil cylinder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160330 |
|
| WD01 | Invention patent application deemed withdrawn after publication |