CN103440962A - Intelligent on-line oil filling vehicle for transformer and oil filling method - Google Patents
Intelligent on-line oil filling vehicle for transformer and oil filling method Download PDFInfo
- Publication number
- CN103440962A CN103440962A CN2013103320596A CN201310332059A CN103440962A CN 103440962 A CN103440962 A CN 103440962A CN 2013103320596 A CN2013103320596 A CN 2013103320596A CN 201310332059 A CN201310332059 A CN 201310332059A CN 103440962 A CN103440962 A CN 103440962A
- Authority
- CN
- China
- Prior art keywords
- transformer
- oil
- frequency conversion
- gasoline pump
- way pipe
- 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
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention discloses an intelligent on-line oil filling vehicle for a transformer and an oil filling method. The intelligent on-line oil filling vehicle comprises an oil storage tank with an oil outlet valve, a variable frequency oil pump, a three-way pipe and a control module, wherein an oil outlet solenoid valve, an oil drain valve and a pressure sensor with pressure limit control are arranged on the three-way pipe, and the pressure sensor, the three-way pipe, the oil outlet solenoid valve, the oil drain valve, the variable frequency oil pump, the oil storage tank and the control module are arranged on a small car or an electric car; and the oil outlet solenoid valve on the three-way pipe is communicated with an oil filling valve below an oil conservator of the transformer through a connecting pipe in application. The intelligent on-line oil filling vehicle for the transformer can be directly driven to the main transformer of a substation for intelligent live on-line oil filling work, and quickly evacuates from the substation site at the end of work. Compared with the traditional oil filling device, the device has the great advantages of safety, high efficiency, convenience and quickness.
Description
Technical field
The present invention relates to a kind of recharging oil device, particularly a kind of transformer on-line intelligence repairing car and oil supplement method.
Background technology
Transformer is in running, when occurring when seepage, the temperature difference etc. cause oil level to be reduced to the oil level indicator low level to carry out repairing, present widely used traditional repairing mode, to be connected to transformer top conservator with gasoline pump or oil filter to draw lower priming valve place and refueled (or being connected to transformer bottom delivery valve), uncontrollable owing to adding oil pressure in refueling process, and oil stream impact, turbulent flow can occur, the situation such as splash, may cause the catastrophe failure of transformer internal discharge, therefore the transformer power failure must be turned to inspecting state and just can carry out repairing work.Adopting has a power failure carries out repairing, to production, brings very large economic loss, has also increased working strength and operating time simultaneously.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, and a kind of transformer on-line intelligence repairing car that can realize online repairing is provided.
Another object of the present invention also is to provide a kind of transformer on-line intelligence oil supplement method that can realize online repairing.
A kind of transformer on-line intelligence repairing car, include the oil tank with delivery valve, the frequency conversion gasoline pump, three-way pipe and control module, solenoid is housed out on three-way pipe, draining valve, the pressure sensor of controlling with pressure limiting, the import of described frequency conversion gasoline pump is connected with oil tank, the outlet of frequency conversion gasoline pump is connected with three-way pipe, going out solenoid is arranged on the port of export of three-way pipe and is connected with the priming valve of installation for transformer by external connecting leg, draining valve is arranged on the side branch of three connecting pipes, described transformer on-line intelligence recharging oil device also includes for replacing the electric contact oil level indicator of oil level indicator in installation for transformer, described control module is for receiving pressure sensor, and the information of electric contact oil level indicator the action of controlling the frequency conversion gasoline pump and going out solenoid, described pressure sensor, three-way pipe, go out solenoid, draining valve, the frequency conversion gasoline pump, oil tank and control module all are arranged on kart or electric automobile, the solenoid that goes out on three-way pipe is communicated with the priming valve under installation for transformer draws by tube connector when application.
Transformer on-line intelligence repairing car of the present invention, the solenoid that goes out on transformer on-line intelligence repairing car three-way pipe is communicated with and can carries out repairing work with priming valve under transformer top conservator draws by extension tube attached, when carrying out repairing, pressure sensor can be by transformer internal oil pressure data real-time sensing to the control module of designed type selecting, pressure reduction control program by this control module according to design, control the frequency of frequency conversion gasoline pump, automatically adjust the frequency conversion gasoline pump all the time with the repairing of being releived of the pressure a little more than the transformer internal oil pressure, this device can prevent that overvoltage danger from appearring in refueling process, when specified oil level is arrived in repairing, connecting automatic control of electric contact oil level indicator closes gasoline pump and goes out solenoid, the repairing end-of-job.Because repairing controls by pressure reduction the oil-feed of releiving all the time, therefore the repairing overall process can not produce such as oil stream impact, turbulent flow, the situation such as splash, having overcome traditional gasoline pump and various oil filter, to add oil pressure uncontrollable and produce oil stream impact, turbulent flow, splash etc. and may cause the inner danger that produces the electric discharge catastrophe failure of transformer in service, thereby guaranteed that transformer can carry out safe, reliable, efficient, economic repairing work in charging operation.Simultaneously due to each parts are arranged in kart and electric motor car, therefore can be flexible as required the repairing car is driven near the transformer of required oiling, have advantages of facilitate applicable.
The control module of described transformer on-line intelligence repairing car mainly includes high oil level automatic control circuit, and several parts of pressure limiting automatic control circuit and pressure reduction automatic frequency-conversion control circuit form.
A kind of transformer on-line intelligence oil supplement method, its step is as follows:
1, utilize kart or electric automobile, the repairing car reached on the transformer limit that needs to refuel, then the solenoid that goes out on transformer on-line intelligence repairing car three-way pipe of the present invention is communicated with the priming valve under transformer top conservator draws by extension tube attached,
2, first dismantle installation for transformer before repairing and breathe the silica gel drier that draws lower pipe end, prevent from feeling suffocated in the repairing process,
3, open the priming valve of installation for transformer, open out solenoid, allow the oil of eminence conservator naturally flow down and fill with connecting leg and frequency conversion gasoline pump,
4, unscrew frequency conversion gasoline pump top air relief cock, screw after emitting gas and dead oil,
5, open the delivery valve of oil tank,
6, open the frequency conversion gasoline pump and record in real time oil pressure value in transformer according to pressure sensor, and by the oil pressure that adds of setting pressure reduction parameter control frequency conversion gasoline pump, with under the state a little more than the transformer internal oil pressure all the time, releive and refueled, guarantee the oiling overall process, the situation such as oil stream impact, turbulent flow do not occur, splash and cause the inner contingent electric discharge catastrophe failure of transformer, the pressure limiting device that this device assembles has simultaneously guaranteed that superpressure danger does not occur the repairing process
7,, when refueling to specified oil level, the action of electric contact oil level indicator, automatically close the frequency conversion gasoline pump and go out solenoid,
8, close the installation for transformer priming valve, the silica gel drier of originally dismounting reinstalled to the conservator breathing and draw lower pipe end,
9, close the oil tank delivery valve,
10, open draining valve, drain oil in pipeline.
In sum, the present invention's following advantage compared to existing technology:
Transformer on-line intelligence repairing car of the present invention and oil supplement method, overcome in the middle of prior art when tradition is carried out repairing work, the carryings such as various fuel-servicing equipments, store oil equipment and pipeline, power supply need be got on the bus, or get on the bus with crane lifting, need again to carry to transformer station the heavy inefficient operation that unloading is got off, and the transformer station that is covered with high voltage equipment in surrounding, there are very large hazards in transportation loading and unloading work.This device design selection is arranged on the rear cabinet of kart or electric automobile, makes it to become self-contained one, can directly open near transforming plant main transformer, and main transformer is carried out to charged on-line intelligence repairing work, and end-of-job is withdrawn rapidly substation field.This device is compared with traditional recharging oil device, have the safety used, efficiently, huge advantage easily and efficiently.
What simultaneously traditional repairing equipment adopted is gasoline pump or oil filter (comprising vacuum oil-filter), uncontrollable owing to adding oil pressure in refueling process, and oil stream impact, turbulent flow can occur, the situation such as splash, may cause the catastrophe failure of transformer internal discharge, therefore the transformer power failure must be turned to inspecting state and just can carry out repairing work.This device is by the oil pressure that adds of setting pressure reduction parameter control frequency conversion gasoline pump, with under the state a little more than the installation for transformer internal oil pressure all the time, releive and refueled, guarantee the oiling overall process, the situation such as oil stream impact, turbulent flow do not occur, splash and cause the inner contingent electric discharge catastrophe failure danger of transformer, the pressure limiting device of this device assembling has simultaneously guaranteed that superpressure danger does not occur the repairing process, therefore can complete transformer repairing work without having a power failure, with need the have a power failure various kinds of equipment of carrying out of traditional repairing, compare and there is the advantage that can not intend ratio.。
The accompanying drawing explanation
Fig. 1 is the structural representation of transformer on-line intelligence repairing car of the present invention.
Fig. 2 is the high oil level automatically controlled circuit diagram of the embodiment of the present invention.
Fig. 3 is the pressure limiting automatically controlled circuit diagram of the embodiment of the present invention.
Fig. 4 is the pressure reduction automatic frequency-conversion control circuit figure of the embodiment of the present invention.
Label declaration 1 frequency conversion gasoline pump 2 three-way pipes 21 go out pressure sensor 3 oil tank 4 electric contact oil level indicator 5 installation for transformer 6 kart that solenoid 22 draining valves 23 are controlled with pressure limiting.
Embodiment
Below in conjunction with embodiment, the present invention is described in more detail.
Embodiment 1
A kind of transformer on-line intelligence repairing car as Figure 1-4, include the oil tank 3 with delivery valve, frequency conversion gasoline pump 1, three-way pipe 2 and control module, solenoid 21 is housed out on three-way pipe, draining valve 22, the pressure sensor 23 of controlling with pressure limiting, the import of described frequency conversion gasoline pump is connected with oil tank, the outlet of frequency conversion gasoline pump is connected with three-way pipe, going out solenoid is arranged on the port of export of three-way pipe and is connected with the priming valve of installation for transformer 5 by external connecting leg, draining valve is arranged on the side branch of three connecting pipes, described transformer on-line intelligence recharging oil device also includes for replacing the electric contact oil level indicator 4 of oil level indicator in installation for transformer, described control module is for receiving pressure sensor, and the information of electric contact oil level indicator the action of controlling the frequency conversion gasoline pump and going out solenoid, described pressure sensor, three-way pipe, go out solenoid, draining valve, the frequency conversion gasoline pump, oil tank and control module all are arranged on kart 6, the solenoid that goes out on three-way pipe is communicated with the priming valve under installation for transformer draws by tube connector when application.
The control module of described transformer on-line intelligence repairing car mainly includes high oil level automatic control circuit, and several parts of pressure limiting automatic control circuit and pressure reduction automatic frequency-conversion control circuit form.
The repairing process of this transformer on-line intelligence repairing car is as follows:
1, utilize kart or electric automobile, the repairing car reached on the transformer limit that needs to refuel, then the solenoid that goes out on transformer on-line intelligence repairing car three-way pipe of the present invention is communicated with the priming valve under transformer top conservator draws by extension tube attached,
2, first dismantle installation for transformer before repairing and breathe the silica gel drier that draws lower pipe end, prevent from feeling suffocated in the repairing process.
3, open the priming valve of installation for transformer, open out solenoid, allow the oil of eminence conservator naturally flow down and fill with connecting leg and frequency conversion gasoline pump.
4, unscrew frequency conversion gasoline pump top air relief cock, screw after emitting gas and dead oil.
5, open the delivery valve of oil tank.
6, open the frequency conversion gasoline pump and record in real time oil pressure value in transformer according to pressure sensor, and by the oil pressure that adds of setting pressure reduction parameter control frequency conversion gasoline pump, with under the state a little more than the transformer internal oil pressure all the time, releive and refueled, guarantee the oiling overall process, the situation such as oil stream impact, turbulent flow do not occur, splash and cause the inner contingent electric discharge catastrophe failure of transformer, the pressure limiting device that this device assembles has simultaneously guaranteed that superpressure danger does not occur the repairing process.
7,, when refueling to specified oil level, the action of electric contact oil level indicator, automatically close the frequency conversion gasoline pump and go out solenoid.
8, close the installation for transformer priming valve, the silica gel drier of originally dismounting is reinstalled to the conservator breathing and draw lower pipe end.
9, close the oil tank delivery valve.
10, open draining valve, drain oil in pipeline.
It is same as the prior art that the present embodiment is not stated part.
Claims (3)
1. a transformer on-line intelligence repairing car, it is characterized in that: include the oil tank with delivery valve, the frequency conversion gasoline pump, three-way pipe and control module, solenoid is housed out on three-way pipe, draining valve, the pressure sensor of controlling with pressure limiting, the import of described frequency conversion gasoline pump is connected with oil tank, the outlet of frequency conversion gasoline pump is connected with three-way pipe, going out solenoid is arranged on the port of export of three-way pipe and is connected with the priming valve of installation for transformer by external connecting leg, draining valve is arranged on the side branch of three connecting pipes, described transformer on-line intelligence recharging oil device also includes for replacing the electric contact oil level indicator of oil level indicator in installation for transformer, described control module is for receiving pressure sensor, and the information of electric contact oil level indicator the action of controlling the frequency conversion gasoline pump and going out solenoid, described pressure sensor, three-way pipe, go out solenoid, draining valve, the frequency conversion gasoline pump, oil tank and control module all are arranged on kart or electric automobile, the solenoid that goes out on three-way pipe is communicated with the priming valve under installation for transformer draws by tube connector when application.
2. a kind of transformer on-line intelligence repairing car according to claim 1, it is characterized in that: the control module of described transformer on-line intelligence repairing car mainly includes high oil level automatic control circuit, and several parts of pressure limiting automatic control circuit and pressure reduction automatic frequency-conversion control circuit form.
3. a transformer on-line intelligence oil supplement method that adopts the transformer on-line intelligence repairing car of claim 1, is characterized in that, step is as follows:
(1), utilize kart or electric automobile, the repairing car is reached on the transformer limit that needs to refuel, then the solenoid that goes out on transformer on-line intelligence repairing car three-way pipe of the present invention is communicated with the priming valve under transformer top conservator draws by extension tube attached
(2), first dismantle installation for transformer breathe the silica gel drier draw lower pipe end before repairing, prevent from feeling suffocated in the repairing process,
(3), open the priming valve of installation for transformer, open out solenoid, allow the oil of eminence conservator naturally flow down and fill with connecting leg and frequency conversion gasoline pump,
(4), unscrew frequency conversion gasoline pump top air relief cock, screw after emitting gas and dead oil,
(5), open the delivery valve of oil tank,
(6), open the frequency conversion gasoline pump and record in real time oil pressure value in transformer according to pressure sensor, and by the oil pressure that adds of setting pressure reduction parameter control frequency conversion gasoline pump, with under the state a little more than the transformer internal oil pressure all the time, releive and refueled, guarantee the oiling overall process, the situation such as oil stream impact, turbulent flow do not occur, splash and cause the inner contingent electric discharge catastrophe failure of transformer, the pressure limiting device that this device assembles has simultaneously guaranteed that superpressure danger does not occur the repairing process
(7), when refueling to specified oil level, the action of electric contact oil level indicator, automatically close the frequency conversion gasoline pump and go out solenoid,
(8), close the installation for transformer priming valve, the silica gel drier of originally dismounting is reinstalled to conservator and breathes and draw lower pipe end,
(9), close the oil tank delivery valve,
(10), open draining valve, drain oil in pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310332059.6A CN103440962B (en) | 2013-08-01 | 2013-08-01 | Transformer on-line intelligence repairing car and oil supplement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310332059.6A CN103440962B (en) | 2013-08-01 | 2013-08-01 | Transformer on-line intelligence repairing car and oil supplement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103440962A true CN103440962A (en) | 2013-12-11 |
| CN103440962B CN103440962B (en) | 2016-06-01 |
Family
ID=49694650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310332059.6A Active CN103440962B (en) | 2013-08-01 | 2013-08-01 | Transformer on-line intelligence repairing car and oil supplement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103440962B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103824680A (en) * | 2014-03-03 | 2014-05-28 | 国家电网公司 | On-line intelligent oil recharging device and method for electric oil-charged transformer |
| CN104036923A (en) * | 2014-01-21 | 2014-09-10 | 国家电网公司 | Oil-supplementing machine for oil-immersed current transformer |
| CN105761903A (en) * | 2016-05-17 | 2016-07-13 | 国网山东省电力公司莱芜供电公司 | Vehicle-mounted integrated transformer oil filtering device |
| CN106298174A (en) * | 2015-06-02 | 2017-01-04 | 广西电网有限责任公司桂林供电局 | A kind of oil supply machine of variable-ratio |
| CN108288531A (en) * | 2018-01-09 | 2018-07-17 | 国网山东省电力公司滨州供电公司 | A kind of transformer oil level auxiliary conditioning unit |
| CN108461257A (en) * | 2018-01-17 | 2018-08-28 | 国网浙江宁波市鄞州区供电有限公司 | The recharging oil device of for transformer |
| CN108693223A (en) * | 2017-04-06 | 2018-10-23 | 北京至感传感器技术研究院有限公司 | The on-line monitoring method and system of active sulfur in liquid oil |
| CN109559872A (en) * | 2018-12-21 | 2019-04-02 | 云南电网有限责任公司电力科学研究院 | Transformer capsule-type conservator with pressure compensation and its control monitoring method |
| CN113790399A (en) * | 2021-09-15 | 2021-12-14 | 广东电网有限责任公司 | Automatic oil pressure regulating device for transformer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5621252B2 (en) * | 1975-06-20 | 1981-05-18 | ||
| CN2535910Y (en) * | 2002-04-02 | 2003-02-12 | 郭敏 | Live-line fuel charger for power equipment |
| CN201708008U (en) * | 2010-06-17 | 2011-01-12 | 中国石化集团胜利石油管理局电力管理总公司 | Vacuum oiling device |
| CN201765910U (en) * | 2010-09-07 | 2011-03-16 | 南车株洲电机有限公司 | Constant pressure oil supplement device |
| CN102034591A (en) * | 2010-10-29 | 2011-04-27 | 山东鲁能泰山电力设备有限公司 | Device and method for injecting oil into transformer under vacuum condition |
| CN203026301U (en) * | 2012-11-28 | 2013-06-26 | 合肥瑞博电气有限公司 | Pressure regulating and oil feeding system |
| CN203423031U (en) * | 2013-08-01 | 2014-02-05 | 国家电网公司 | On-line intelligent oil supplementation vehicle for transformer |
-
2013
- 2013-08-01 CN CN201310332059.6A patent/CN103440962B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5621252B2 (en) * | 1975-06-20 | 1981-05-18 | ||
| CN2535910Y (en) * | 2002-04-02 | 2003-02-12 | 郭敏 | Live-line fuel charger for power equipment |
| CN201708008U (en) * | 2010-06-17 | 2011-01-12 | 中国石化集团胜利石油管理局电力管理总公司 | Vacuum oiling device |
| CN201765910U (en) * | 2010-09-07 | 2011-03-16 | 南车株洲电机有限公司 | Constant pressure oil supplement device |
| CN102034591A (en) * | 2010-10-29 | 2011-04-27 | 山东鲁能泰山电力设备有限公司 | Device and method for injecting oil into transformer under vacuum condition |
| CN203026301U (en) * | 2012-11-28 | 2013-06-26 | 合肥瑞博电气有限公司 | Pressure regulating and oil feeding system |
| CN203423031U (en) * | 2013-08-01 | 2014-02-05 | 国家电网公司 | On-line intelligent oil supplementation vehicle for transformer |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104036923A (en) * | 2014-01-21 | 2014-09-10 | 国家电网公司 | Oil-supplementing machine for oil-immersed current transformer |
| CN103824680A (en) * | 2014-03-03 | 2014-05-28 | 国家电网公司 | On-line intelligent oil recharging device and method for electric oil-charged transformer |
| CN106298174A (en) * | 2015-06-02 | 2017-01-04 | 广西电网有限责任公司桂林供电局 | A kind of oil supply machine of variable-ratio |
| CN105761903A (en) * | 2016-05-17 | 2016-07-13 | 国网山东省电力公司莱芜供电公司 | Vehicle-mounted integrated transformer oil filtering device |
| CN108693223A (en) * | 2017-04-06 | 2018-10-23 | 北京至感传感器技术研究院有限公司 | The on-line monitoring method and system of active sulfur in liquid oil |
| CN108288531A (en) * | 2018-01-09 | 2018-07-17 | 国网山东省电力公司滨州供电公司 | A kind of transformer oil level auxiliary conditioning unit |
| CN108288531B (en) * | 2018-01-09 | 2023-12-19 | 国网山东省电力公司滨州供电公司 | Transformer oil level auxiliary adjusting device |
| CN108461257A (en) * | 2018-01-17 | 2018-08-28 | 国网浙江宁波市鄞州区供电有限公司 | The recharging oil device of for transformer |
| CN108461257B (en) * | 2018-01-17 | 2024-04-09 | 国网浙江宁波市鄞州区供电有限公司 | Oil supplementing device for transformer |
| CN109559872A (en) * | 2018-12-21 | 2019-04-02 | 云南电网有限责任公司电力科学研究院 | Transformer capsule-type conservator with pressure compensation and its control monitoring method |
| CN113790399A (en) * | 2021-09-15 | 2021-12-14 | 广东电网有限责任公司 | Automatic oil pressure regulating device for transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103440962B (en) | 2016-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103440962A (en) | Intelligent on-line oil filling vehicle for transformer and oil filling method | |
| CN203423032U (en) | On-line intelligent oil supplementation device for transformer | |
| CN101931175B (en) | Method for replacing accessory of large transformer without discharging oil by vacuum oil extraction | |
| CN104575961A (en) | Main transformer on-load switch online intelligent oil supply device and use method thereof | |
| CN103824680A (en) | On-line intelligent oil recharging device and method for electric oil-charged transformer | |
| CN106348240B (en) | Top petrol tank low level fuel loading system | |
| CN203423031U (en) | On-line intelligent oil supplementation vehicle for transformer | |
| CN102673794A (en) | Overhead fuel drainage device using fuel supply pumps as power | |
| CN201991861U (en) | Integrated valve block for heavy forklift hydraulic system | |
| CN204387677U (en) | A kind of skid-mounted gas filling station | |
| CN202449839U (en) | Nitrogen static-pressure vacuum refueling machine | |
| CN204702499U (en) | Effectively can regulate the oil gas recovery system of gas station of gas liquid ratio | |
| CN208060300U (en) | A kind of pneumatic pressure testing device of vehicle mounted electric | |
| CN202733388U (en) | Energy accumulation type lubricating oil refueling trolley | |
| CN204493044U (en) | A kind of common rail motor low pressure oil way blow-off system | |
| CN204134824U (en) | A kind of automatic oiling frock of air-conditioner controller | |
| CN201908770U (en) | Governor oil leakage tank device of pumped storage power station for facilitating isolated examine and repair | |
| CN203500183U (en) | Online intelligent oil-recharging device of electric transformer | |
| CN202352453U (en) | On-site oil storage tank of transformer | |
| CN205751773U (en) | A kind of charged absorbing treatment device of 110 220 kilovolts of main fransformer oils | |
| CN206429232U (en) | A kind of CO2 pressure breaks remote control high pressure unloading system | |
| CN201155656Y (en) | Railway passenger car bearing automatic control grease adding equipment | |
| CN204328454U (en) | One tank one pump two machine LNG filling station | |
| CN215626776U (en) | Liquid lubricating oil tank wagon | |
| CN2561067Y (en) | Vacuum oiling machine |
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 |