CN102489650A - Automatic liquid supplementing and draining system with liquid filling tank - Google Patents
Automatic liquid supplementing and draining system with liquid filling tank Download PDFInfo
- Publication number
- CN102489650A CN102489650A CN201110366339XA CN201110366339A CN102489650A CN 102489650 A CN102489650 A CN 102489650A CN 201110366339X A CN201110366339X A CN 201110366339XA CN 201110366339 A CN201110366339 A CN 201110366339A CN 102489650 A CN102489650 A CN 102489650A
- Authority
- CN
- China
- Prior art keywords
- pressure
- oil
- tank
- loaded prefilling
- prefilling tank
- 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.)
- Granted
Links
Images
Landscapes
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
The invention belongs to a forging oil hydraulic press system, in particular to an automatic liquid supplementing and draining system with a liquid filling tank in a fast forging oil hydraulic press system; the automatic liquid supplementing and draining system with the liquid filling tank is characterized by at least comprising the liquid filling tank, an oil supply loop, an oil discharging loop and a working oil line, wherein the oil supply loop and the oil discharging loop are connected with the liquid filling tank, and the working oil line supplies working oil to a working cylinder; the liquid filling tank is connected with a liquid level sensor and a charging loop; when the automatic liquid supplementing and draining system works, the charging loop charges 0.3-0.5 MPa of air pressure into the liquid filling tank, the liquid level sensor detects the oil level of the liquid filling tank; when the oil level is lower than a low oil level, an electric control unit controls the oil supply loop to supply oil to the liquid filling tank; and when the oil level is high than a high oil level of the liquid filling tank, the oil supply loop stops working, and the electric control unit controls the oil discharging loop to work. The automatic liquid supplementing and draining system has the advantages that the oil absorption condition of a main pump device is improved and the pressure impact and vibration of the system are reduced, thereby the working efficiency of the oil hydraulic press is improved.
Description
Technical field
The invention belongs to the forge oil press system, particularly belong to pressure-loaded prefilling tank automatic liquid supply and drainage system in the rapid forge hydraulic press system.
Background technology
The generally oil suction in fuel tank of existing forge oil press main pump device, fluid flows back to fuel tank again through working cylinder and feather valve station.In entire work process, the natural oil suction in the fuel tank of main pump device is prone to produce emptying phenomenon, during work vibrations big, have a strong impact on oil pump service life; Pressure oil directly discharges oil sump tank during the feather valve pressure release, produces bigger shock and vibration in fuel tank and the pipeline, influences the press operating efficiency.
Summary of the invention
The purpose of this invention is to provide a kind of automatic liquid supply and drainage system, the pressure-loaded prefilling tank liquid level is controlled, the application of pressure-loaded prefilling tank device can significantly improve main pump device oil suction situation, reduces system pressure impact and vibration, thereby improves the hydraulic press operating efficiency.
Technical scheme of the present invention is: a kind of pressure-loaded prefilling tank automatic liquid supply and drainage system: it is characterized in that: comprise pressure-loaded prefilling tank at least, with the tank connected oil supply loop of topping up, the working oil path of working oil is provided with the tank connected oil-discharging circuit of topping up with to working cylinder; Pressure-loaded prefilling tank is connected with liquid level sensor and pressurising loop, and during work, the air pressure of 0.3～0.5MPa is filled in the pressurising loop in pressure-loaded prefilling tank; Liquid level sensor detects the oil level of pressure-loaded prefilling tank, and when being lower than low oil level, electric control unit control oil supply loop is to the pressure-loaded prefilling tank fuel feeding; Make pressure-loaded prefilling tank oil level work of treatment oil level interval; When being higher than the high oil level point of pressure-loaded prefilling tank, fuel cut-off loop works, the work of electric control unit control oil-discharging circuit; Make pressure-loaded prefilling tank oil level work of treatment oil level interval, close oil-discharging circuit and oil supply loop valve.
Described oil supply loop comprises; Fuel tank, screw pump device; Electric control unit is electrically connected with screw pump device, and fuel tank is connected with pressure-loaded prefilling tank oil transportation mouth through screw pump device, and electric control unit is supplied with pressure-loaded prefilling tank through the work of control screw pump device with the oil of fuel tank.
Described oil-discharging circuit comprises: first tapping valve, second tapping valve and fuel tank; First tapping valve, second tapping valve are connected in parallel; The oil extraction port of first tapping valve and second tapping valve is communicated with fuel tank; The input port of first tapping valve and second tapping valve is communicated with pressure-loaded prefilling tank, and electric control unit is discharged in the fuel tank with the excessive oil of different oil drain quantities with pressure-loaded prefilling tank through controlling first tapping valve and the second tapping valve timesharing or working simultaneously.
Described working oil path comprises: feather valve station, working cylinder and main pump device; Feather valve station, main pump device are connected with working cylinder respectively, and the feather valve station is communicated with pressure-loaded prefilling tank, and main pump device when work is from the pressure-loaded prefilling tank oil suction; Provide pressure oil to working cylinder; Hydraulic press carries out pressurized operation, and after pressurization finished, the pressure oil in the working cylinder passed through the oil extraction of feather valve station in pressure-loaded prefilling tank; Main pump device circulation time, fluid directly is discharged in the fuel tank.
Described liquid level sensor is fixed in the pressure-loaded prefilling tank, is used to detect the oil level in the pressure-loaded prefilling tank, and pressure-loaded prefilling tank is divided into 5 test points with oil level, is respectively 1YW～5YW, and from the bottom to top, work oil level interval is between 2YW～3YW.
Described pressurising loop comprises: outdoor inflation point, pressure sensor and gas safety valve; Outdoor inflation point is connected with the pressure-loaded prefilling tank pipeline through the valve pipe fitting; Pressure sensor and gas safety valve are arranged on the pipeline, and pressure sensor is used for monitoring the pressure-loaded prefilling tank air pressure change, when air pressure during greater than 0.55MPa; The gas safety valve is opened, and prevents that the pressure-loaded prefilling tank internal pressure is too high.
Advantage of the present invention is: combine pressure-loaded prefilling tank that the jumbo characteristic of pressure is arranged, detect its liquid level change through liquid level sensor, electric control unit carry out automatic monitoring system to the pressure-loaded prefilling tank liquid level.When the oil suction in pressure-loaded prefilling tank of main pump device causes liquid level to reduce, can carry out fluid infusion to it through screw pump device; In pressure-loaded prefilling tank during discharge opeing, the pressure-loaded prefilling tank liquid level rises main working cylinder, can flow back to fuel tank through tapping valve, thereby forms the circulation of fluid via the feather valve station.During the screw pump fluid infusion, fluid is carried out circulating filtration and cooling, also guaranteed the cleannes and the temperature requirement of fluid in the pressure-loaded prefilling tank.The main pump device has improved the oil suction situation of oil pump, the life-span of having improved oil pump greatly from the oil suction of low pressure pressure-loaded prefilling tank; The feather valve station is pressure release and discharge opeing in pressure-loaded prefilling tank, has reduced system pressure impact and vibration, has improved service life of equipment.
Description of drawings
Below in conjunction with example figure patent of the present invention is described further:
Fig. 1 is the pressure-loaded prefilling tank automatic liquid supply and the drainage system principle schematic of patent of the present invention.
Among the figure: 1. outdoor inflation point; 2. feather valve station; 3. working cylinder; 4. main pump device; 5. electric control unit; 6. fuel tank; 7. first tapping valve; 8. overflow valve; 9. second tapping valve; 10. screw pump device; 11. pressure-loaded prefilling tank; 12. liquid level sensor; 13. pressure sensor; 14. gas safety valve.
The specific embodiment
A kind of pressure-loaded prefilling tank automatic liquid supply and drainage system: comprise pressure-loaded prefilling tank 11 at least, the oil supply loop that is connected with pressure-loaded prefilling tank 11, the oil-discharging circuit that is connected with the pressure-loaded prefilling tank 11 and working oil path of working oil is provided to working cylinder 3; Pressure-loaded prefilling tank 11 is connected with liquid level sensor and pressurising loop, and during work, the air pressure of 0.3～0.5MPa is filled in the pressurising loop in pressure-loaded prefilling tank 11; Liquid level sensor detects the oil level of pressure-loaded prefilling tank 11, and when being lower than low oil level, electric control unit 5 control oil supply loops are to pressure-loaded prefilling tank 11 fuel feeding; Make pressure-loaded prefilling tank 11 oil levels work of treatment oil level interval; When being higher than the high oil level point of pressure-loaded prefilling tank 11, fuel cut-off loop works, electric control unit 5 control oil-discharging circuit work; Make pressure-loaded prefilling tank 11 oil levels work of treatment oil level interval, close oil-discharging circuit and oil supply loop valve.
Described oil supply loop comprises; Fuel tank 6, screw pump device 10; Electric control unit 5 is electrically connected with screw pump device 10, and fuel tank 6 is connected with pressure-loaded prefilling tank 11 oil transportation mouths through screw pump device 10, and electric control unit 5 is supplied with pressure-loaded prefilling tank 11 through 10 work of control screw pump device with the oil of fuel tank 6.
Described oil-discharging circuit comprises: first tapping valve 7, second tapping valve 9 and fuel tank 6; First tapping valve 7, second tapping valve 9 are connected in parallel; The oil extraction port of first tapping valve 7 and second tapping valve 9 is communicated with fuel tank 6; The input port of first tapping valve 7 and second tapping valve 9 is communicated with pressure-loaded prefilling tank 11, and electric control unit 5 is discharged in the fuel tank 6 with the excessive oil of different oil drain quantities with pressure-loaded prefilling tank 11 through controlling first tapping valve 7 and 9 timesharing of second tapping valve or working simultaneously.
Described working oil path comprises: feather valve station 2, working cylinder 3 and main pump device 4; Feather valve station 2, main pump device 4 are connected with working cylinder 3 respectively, and feather valve station 2 is communicated with pressure-loaded prefilling tank 11, during main pump device 4 work from pressure-loaded prefilling tank 11 oil suctions; Provide pressure oil to working cylinder 3; Hydraulic press carries out pressurized operation, and after pressurization finished, the pressure oil in the working cylinder 3 arrived 11 li of pressure-loaded prefilling tanks through 2 oil extractions of feather valve station.Main pump device 4 circulation times, fluid directly is discharged in the fuel tank 6.
Described liquid level sensor is fixed in the pressure-loaded prefilling tank 11, is used to detect the oil level in the pressure-loaded prefilling tank 11, and pressure-loaded prefilling tank 11 is divided into 5 test points with oil level, is respectively 1YW～5YW, and from the bottom to top, work oil level interval is between 2YW～3YW.
Described pressurising loop comprises: outdoor inflation point 1, pressure sensor 13 and gas safety valve 14; Outdoor inflation point 1 is connected with pressure-loaded prefilling tank 11 pipelines through the valve pipe fitting; Pressure sensor 13 and gas safety valve 14 are arranged on the pipeline; Pressure sensor 13 is used for monitoring pressure-loaded prefilling tank 11 air pressure change, and gas safety valve 14 is used for preventing that the too high appearance of pressure-loaded prefilling tank 11 internal pressures is unexpected.When air pressure during greater than 0.55MPa, gas safety valve 14 is opened, and prevents that the too high appearance of pressure-loaded prefilling tank 11 internal pressures is unexpected.
During work, be filled with the air pressure of 0.3～0.5MPa in the pressure-loaded prefilling tank 11 through outdoor inflation point 1, pressure-loaded prefilling tank 11 liquid levels detect and provide detection signal by liquid level sensor 12.Pressure-loaded prefilling tank 11 operate as normal liquid levels are between 2YW and 3YW.In the liquid level uphill process, first tapping valve 7 is opened during to 3YW in the pressure-loaded prefilling tank 11, and fluid flows back to fuel tank 6 under gas pressure, if liquid level descends, closes first tapping valve 7 during to 2YW; If liquid level still continues to rise, open second tapping valve 9 during to 4YW again, if liquid level descends, close second tapping valve 9 during to 3YW, close first tapping valve 7 during to 2YW.If during to 5YW, show system exception, the exhaust of reporting to the police, and autostop.In liquid level decline process in the pressure-loaded prefilling tank 11, screw pump device 10 is started working during to 2YW, and fluid infusion in pressure-loaded prefilling tank 11 stops when liquid level rises to 3YW; If when liquid level continues to drop to 1YW, show system exception, report to the police and autostop.
Along with the variation of pressure-loaded prefilling tank 11 liquid levels, gas pressure also can change in the pressure-loaded prefilling tank 11, and electric control unit 5 is monitored pressure-loaded prefilling tank 11 air pressure change through pressure sensor 13.When air pressure during greater than 0.55MPa, gas safety valve 14 is opened, and prevents that the too high appearance of pressure-loaded prefilling tank 11 internal pressures is unexpected; Low-voltage safety overflow valve 8 is arranged on the pressure-loaded prefilling tank 11; Oil pressure relief is set up at 0.52MPa, and liquid level raises in pressure-loaded prefilling tank 11, when making pressure-loaded prefilling tank 11 internal pressures surpass 0.52MPa; Fluid flows back to fuel tank 6 through overflow valve 8, with the safety of protection pressure-loaded prefilling tank 11.
Claims (6)
1. pressure-loaded prefilling tank automatic liquid supply and drainage system: it is characterized in that: comprise pressure-loaded prefilling tank (11) at least, the oil supply loop that is connected with pressure-loaded prefilling tank (11), the oil-discharging circuit that is connected with pressure-loaded prefilling tank (11) and the working oil path of working oil is provided to working cylinder (3); Pressure-loaded prefilling tank (11) is connected with liquid level sensor and pressurising loop; During work, the air pressure of 0.3～0.5MPa is filled in the pressurising loop in pressure-loaded prefilling tank (11), and liquid level sensor detects the oil level of pressure-loaded prefilling tank (11); When being lower than low oil level; Electric control unit (5) control oil supply loop makes pressure-loaded prefilling tank (11) oil level work of treatment oil level interval to pressure-loaded prefilling tank (11) fuel feeding, when being higher than the high oil level point of pressure-loaded prefilling tank (11); The fuel cut-off loop works; The work of electric control unit (5) control oil-discharging circuit makes pressure-loaded prefilling tank (11) oil level work of treatment oil level interval, closes oil-discharging circuit and oil supply loop valve.
2. pressure-loaded prefilling tank automatic liquid supply according to claim 1 and drainage system: it is characterized in that: described oil supply loop comprises; Fuel tank (6), screw pump device (10); Electric control unit (5) is electrically connected with screw pump device (10); Fuel tank (6) is connected with pressure-loaded prefilling tank (11) oil transportation mouth through screw pump device (10), and electric control unit (5) is supplied with pressure-loaded prefilling tank (11) through control screw pump device (10) work with the oil of fuel tank (6).
3. pressure-loaded prefilling tank automatic liquid supply according to claim 1 and drainage system: it is characterized in that: described oil-discharging circuit comprises: first tapping valve (7), second tapping valve (9) and fuel tank (6); First tapping valve (7), second tapping valve (9) are connected in parallel; The oil extraction port of first tapping valve (7) and second tapping valve (9) is communicated with fuel tank (6); The input port of first tapping valve (7) and second tapping valve (9) is communicated with pressure-loaded prefilling tank (11); Electric control unit (5) is discharged in the fuel tank (6) with the excessive oil of different oil drain quantities with pressure-loaded prefilling tank (11) through controlling first tapping valve (7) and (9) timesharing of second tapping valve or working simultaneously.
4. pressure-loaded prefilling tank automatic liquid supply according to claim 1 and drainage system: it is characterized in that: described working oil path comprises: feather valve station (2), working cylinder (3) and main pump device (4); Feather valve station (2), main pump device (4) are connected with working cylinder (3) respectively; Feather valve station (2) is communicated with pressure-loaded prefilling tank (11); From pressure-loaded prefilling tank (11) oil suction, provide pressure oil to working cylinder (3) during main pump device (4) work, hydraulic press carries out pressurized operation; After pressurization finished, the pressure oil in the working cylinder (3) arrived pressure-loaded prefilling tank (11) lining through feather valve station (2) oil extraction; Main pump device (4) circulation time, fluid directly is discharged in the fuel tank (6).
5. pressure-loaded prefilling tank automatic liquid supply according to claim 1 and drainage system: it is characterized in that: described liquid level sensor is fixed in the pressure-loaded prefilling tank (11); Be used to detect the oil level in the pressure-loaded prefilling tank (11); Pressure-loaded prefilling tank (11) is divided into 5 test points with oil level; Be respectively 1YW～5YW, from the bottom to top, work oil level interval is between 2YW～3YW.
6. pressure-loaded prefilling tank automatic liquid supply according to claim 1 and drainage system: it is characterized in that: described pressurising loop comprises: outdoor inflation point (1), pressure sensor and gas safety valve; Outdoor inflation point is connected with pressure-loaded prefilling tank (11) pipeline through the valve pipe fitting; Pressure sensor and gas safety valve are arranged on the pipeline, and pressure sensor is used for monitoring the pressure-loaded prefilling tank air pressure change, when air pressure during greater than 0.55MPa; The gas safety valve is opened, and prevents that the pressure-loaded prefilling tank internal pressure is too high.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110366339.XA CN102489650B (en) | 2011-11-18 | 2011-11-18 | Automatic liquid supplementing and draining system with liquid filling tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110366339.XA CN102489650B (en) | 2011-11-18 | 2011-11-18 | Automatic liquid supplementing and draining system with liquid filling tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102489650A true CN102489650A (en) | 2012-06-13 |
| CN102489650B CN102489650B (en) | 2014-02-05 |
Family
ID=46181534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110366339.XA Active CN102489650B (en) | 2011-11-18 | 2011-11-18 | Automatic liquid supplementing and draining system with liquid filling tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102489650B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286251A (en) * | 2013-05-17 | 2013-09-11 | 天津市天锻压力机有限公司 | Oil supply system of hydraulic forging press |
| CN106694565A (en) * | 2017-01-09 | 2017-05-24 | 中冶华天工程技术有限公司 | Control device of high-speed wire rod thin oil lubrication pressure oil storage tank |
| CN107520759A (en) * | 2016-06-21 | 2017-12-29 | 上海新昇半导体科技有限公司 | A kind of polishing solution supplying system and method |
| CN108953300A (en) * | 2018-08-29 | 2018-12-07 | 中国二十二冶集团有限公司 | Pressure oil tank filling liquid oil-supplementing system and oil supplement method |
| CN113247480A (en) * | 2021-05-18 | 2021-08-13 | 中海石油深海开发有限公司 | Automatic pressure supplementing device and method |
| CN113324160A (en) * | 2021-05-27 | 2021-08-31 | 中冶南方工程技术有限公司 | Pressure tank oil supply system of oil film bearing lubrication pump station |
| CN113375060A (en) * | 2021-06-06 | 2021-09-10 | 中国长江电力股份有限公司 | Emergency oil supplementing device and method for pressure container of hydraulic system of hydraulic turbine speed regulator |
| CN114472781A (en) * | 2022-01-27 | 2022-05-13 | 天津市天锻压力机有限公司 | Liquid filling system for free forging press |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3429174A (en) * | 1965-02-10 | 1969-02-25 | Langestein & Schemann Ag | Presses |
| GB1440548A (en) * | 1973-11-22 | 1976-06-23 | Ruthner Industrieanlagen Ag | Control system for hydraulic presses |
| CN1439814A (en) * | 2003-03-26 | 2003-09-03 | 浙江大学 | Frequency converter volume variable speed closed hydraulic control systems |
| CN2773461Y (en) * | 2004-11-10 | 2006-04-19 | 启东润滑设备有限公司 | Centralized fat supplier |
| CN101249730A (en) * | 2008-03-24 | 2008-08-27 | 中南大学 | Hydraulic control system of multi-point driving large hydraulic press |
| CN102078911A (en) * | 2010-12-06 | 2011-06-01 | 中国重型机械研究院有限公司 | Quick return system for quick forging oil press |
-
2011
- 2011-11-18 CN CN201110366339.XA patent/CN102489650B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3429174A (en) * | 1965-02-10 | 1969-02-25 | Langestein & Schemann Ag | Presses |
| GB1440548A (en) * | 1973-11-22 | 1976-06-23 | Ruthner Industrieanlagen Ag | Control system for hydraulic presses |
| CN1439814A (en) * | 2003-03-26 | 2003-09-03 | 浙江大学 | Frequency converter volume variable speed closed hydraulic control systems |
| CN2773461Y (en) * | 2004-11-10 | 2006-04-19 | 启东润滑设备有限公司 | Centralized fat supplier |
| CN101249730A (en) * | 2008-03-24 | 2008-08-27 | 中南大学 | Hydraulic control system of multi-point driving large hydraulic press |
| CN102078911A (en) * | 2010-12-06 | 2011-06-01 | 中国重型机械研究院有限公司 | Quick return system for quick forging oil press |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286251A (en) * | 2013-05-17 | 2013-09-11 | 天津市天锻压力机有限公司 | Oil supply system of hydraulic forging press |
| CN107520759A (en) * | 2016-06-21 | 2017-12-29 | 上海新昇半导体科技有限公司 | A kind of polishing solution supplying system and method |
| CN106694565A (en) * | 2017-01-09 | 2017-05-24 | 中冶华天工程技术有限公司 | Control device of high-speed wire rod thin oil lubrication pressure oil storage tank |
| CN108953300A (en) * | 2018-08-29 | 2018-12-07 | 中国二十二冶集团有限公司 | Pressure oil tank filling liquid oil-supplementing system and oil supplement method |
| CN113247480A (en) * | 2021-05-18 | 2021-08-13 | 中海石油深海开发有限公司 | Automatic pressure supplementing device and method |
| CN113324160A (en) * | 2021-05-27 | 2021-08-31 | 中冶南方工程技术有限公司 | Pressure tank oil supply system of oil film bearing lubrication pump station |
| CN113375060A (en) * | 2021-06-06 | 2021-09-10 | 中国长江电力股份有限公司 | Emergency oil supplementing device and method for pressure container of hydraulic system of hydraulic turbine speed regulator |
| CN113375060B (en) * | 2021-06-06 | 2022-07-19 | 中国长江电力股份有限公司 | Emergency oil supplementing device and method for pressure container of hydraulic system of hydraulic turbine governor |
| CN114472781A (en) * | 2022-01-27 | 2022-05-13 | 天津市天锻压力机有限公司 | Liquid filling system for free forging press |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102489650B (en) | 2014-02-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102489650B (en) | Automatic liquid supplementing and draining system with liquid filling tank | |
| CN202733127U (en) | Marine hydraulic valve on-off control hydraulic system | |
| CN201301466Y (en) | Rotary oil supply loop for hydraulic excavator | |
| CN107137982A (en) | A kind of marine high-pressure compressed air is released protection device | |
| CN201779083U (en) | Hydraulic control system | |
| CN207153284U (en) | A kind of marine high-pressure compressed air is released protection device | |
| CN204152580U (en) | Diesel lubrication low fuel pressure boosting protection alarm system | |
| CN206035947U (en) | Fluid pressure line oil discharge device | |
| CN205918670U (en) | Beat sign indicating number hydraulic press hydraulic control system | |
| CN101245779B (en) | Oil balancing system of reciprocating oil isolation membrane pump fluid end | |
| CN106286254A (en) | A kind of air compressor machine of full-automatic unmanned supervision | |
| CN201802626U (en) | Oil supply system of screw compressor | |
| CN205297646U (en) | Automatic water discharging device of gas drainage pipe remote control | |
| CN107420356A (en) | A kind of energy-saving hydraulic pumping plant for TRT fast cut valves | |
| CN202833109U (en) | Self-closing door oil pump | |
| CN206754017U (en) | A kind of energy-saving hydraulic pumping plant for TRT fast cut valves | |
| CN104359001B (en) | Residual air recovery process | |
| CN204283827U (en) | The automatic start-stop protective gear of Under Water Pumps | |
| CN107228041B (en) | Oil seepage prevention pipeline system of hydraulic turbine unit | |
| CN203717543U (en) | Low pressure filtration system | |
| CN201671840U (en) | Device for extracting underground liquid | |
| CN201972882U (en) | Loop system for reducing ineffective compression of compressor | |
| CN203756655U (en) | Liquid supply system for high-flow pump | |
| CN201137786Y (en) | Hermetic pipeline liquid injecting device | |
| CN213392926U (en) | Deck machinery hydraulic system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 710032 No. 209 Dongyuan Road, Xi'an City, Shaanxi Province Patentee after: China National Heavy Machinery Research Institute Co., Ltd. Address before: 710032 No. 209 Dongyuan Road, Xi'an City, Shaanxi Province Patentee before: China National Heavy Machinery Research Institute Co., Ltd. |