CN112524468A - Controllable environment-friendly safety device for supplying lubricating oil in wire high-speed area - Google Patents
Controllable environment-friendly safety device for supplying lubricating oil in wire high-speed area Download PDFInfo
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- CN112524468A CN112524468A CN202011427646.XA CN202011427646A CN112524468A CN 112524468 A CN112524468 A CN 112524468A CN 202011427646 A CN202011427646 A CN 202011427646A CN 112524468 A CN112524468 A CN 112524468A
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- Prior art keywords
- oil
- safety
- electromagnetic valve
- pump
- oil tank
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
- F16N7/38—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with a separate pump; Central lubrication systems
- F16N7/40—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with a separate pump; Central lubrication systems in a closed circulation system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
- F16N29/04—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems enabling a warning to be given; enabling moving parts to be stopped
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N37/00—Equipment for transferring lubricant from one container to another
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N37/00—Equipment for transferring lubricant from one container to another
- F16N2037/006—Filling
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention relates to a controllable environment-friendly safety device for supplying lubricating oil in a wire high-speed area, which comprises: the lubricating oil pump comprises a thin oil lubricating station, a security oil tank and high-speed wire equipment which are sequentially communicated, wherein the lubricating oil in the thin oil lubricating station is pumped to the security oil tank or the high-speed wire equipment by the pump, and an oil pump outlet one-way valve is arranged at the outlet of the pump; the safety oil tank is communicated with the thin oil lubrication station through an exhaust pipeline, and an exhaust electromagnetic valve and an inflation one-way valve are arranged on the exhaust pipeline; when the security oil tank needs to exhaust, oil and gas in the security oil tank are conveyed to a thin oil lubrication station together, and an oil tank inlet one-way valve and an oil tank outlet one-way valve are arranged at the inlet and the outlet of the security oil tank; the oil supply system also comprises a controller, wherein the controller closes or opens the air inlet electromagnetic valve and the air exhaust electromagnetic valve to ensure the oil supply safety. The invention is environment-friendly and safe, does not return or leak oil, can manually or automatically control the air inlet electromagnetic valve and the air outlet electromagnetic valve through the controller, improves the working safety and convenience, and can realize the aims of green energy-saving and decrement production.
Description
Technical Field
The invention relates to the field of high-speed wire rod equipment, in particular to an oil supply safety device.
Background
The high-speed area equipment of the high-speed wire rod production line mainly refers to finish rolling equipment and pre-finish rolling equipment with high rotating speed, lubricating oil is indispensable to all running equipment, particularly equipment with high rotating speed, a lubricating station is indispensable key equipment of the high-speed wire rod pre-finish rolling and finishing mill set, and particularly plays a role in protecting a roller box oil film bearing. When the pump is stopped due to a fault, the equipment in the high-speed area stops for 90-120 seconds due to rotation inertia, and at the moment, the oil film bearing is damaged due to oil shortage, so that all roller boxes are damaged.
Disclosure of Invention
The invention aims to avoid the defects of the prior art and provides a controllable environment-friendly safety device which has a simpler structure and can automatically and manually control the high-speed wire rod pre-finish rolling and the stable and safe lubricating oil supply of a finishing mill group in a wire rod high-speed area.
In order to achieve the purpose, the invention adopts the technical scheme that: a controllable environmental protection safety device for supplying lubricating oil to a high-speed area of a wire rod, comprising:
the lubricating oil is conveyed to the high-speed wire rod equipment by the thin oil lubricating station through an oil supply pipeline, and the lubricating oil is returned to the thin oil lubricating station by the high-speed wire rod equipment through an oil return pipeline;
the safety oil tank is arranged on a pipeline between the thin oil lubrication station and the wire high-speed driving equipment and is communicated with the thin oil lubrication station and the wire high-speed driving equipment; the safety oil tank is provided with a liquid level meter for checking the safety liquid level, and is communicated with the thin oil lubrication station through an exhaust pipeline, the exhaust pipeline is used for conveying the oil and the gas in the safety oil tank to the thin oil lubrication station, and the exhaust pipeline is provided with an exhaust electromagnetic valve; the safety oil tank is also communicated with compressed air through an air inlet pipeline, and an air inlet electromagnetic valve is arranged on the air inlet pipeline;
the pump is arranged on an oil supply pipeline between the thin oil lubrication station and a security oil tank, and pumps the lubricating oil in the thin oil lubrication station to the security oil tank or high-speed wire equipment;
an air charging one-way valve is also arranged on an air inlet pipeline between the security oil tank and the air inlet electromagnetic valve; the oil supply pipelines of the inlet and the outlet of the security oil tank are respectively provided with an oil tank inlet one-way valve and an oil tank outlet one-way valve; the pump and the high-speed wire rod equipment are provided with an oil pump outlet one-way valve;
the controller is used for controlling the air inlet electromagnetic valve to be closed and the air exhaust electromagnetic valve to be opened when the liquid level of the liquid level meter is lower than a safety value and the thin oil lubrication station needs to supply oil to the safety oil tank through the pump; when the liquid level of the liquid level meter reaches or is higher than a safety value, the controller controls to open the air inlet electromagnetic valve and close the exhaust electromagnetic valve, so that the oil supply safety is ensured.
Furthermore, an electric contact pressure gauge is arranged at the outlet of the pump and is also electrically connected with the controller,
when the pump is in failure, the high-speed wire rod equipment is emergently stopped, the controller obtains a pump stop signal of the electric contact pressure gauge, the controller controls the exhaust electromagnetic valve to be closed and the air inlet electromagnetic valve to be opened, so that the lubricating oil in the safety oil tank is conveyed to the high-speed wire rod equipment until the high-speed wire rod equipment is stably stopped, and the lubrication of an oil film bearing during the inertial stopping of the high-speed wire rod equipment is ensured;
when the pump is normal, the controller obtains a pump starting signal of the electric contact pressure gauge, the controller controls the exhaust electromagnetic valve to be opened and the air inlet electromagnetic valve to be closed, so that the lubricating oil in the thin oil lubricating station is conveyed into the security oil tank until the liquid level of the liquid level gauge reaches or is higher than a safety value.
Furthermore, the lubricating oil pump further comprises an oil inlet bypass pipeline, one end of the oil inlet bypass pipeline is communicated with the pump, and the lubricating oil pumped out by the pump from the thin oil lubrication station is directly conveyed to the high-speed wire rod equipment through the oil inlet bypass pipeline.
Furthermore, a safety valve is arranged on the safety oil tank.
Furthermore, the controller is a PLC controller, a wireless receiving device is arranged on the PLC controller, an operator controls the air inlet electromagnetic valve and the air outlet electromagnetic valve through a remote controller, and a wireless sending device and a control key which are matched with the remote controller are arranged on the remote controller.
Furthermore, the high-speed wire rod equipment is finish rolling and pre-finish rolling equipment.
The oil quantity safety value mainly refers to the oil quantity of lubricating oil of an oil film bearing during inertial parking of high-speed wire rod equipment, and the oil quantity which must be reserved under the condition of ensuring safety and production in the safety oil tank.
The invention has the beneficial effects that: through optimizing the structure, reduce and rotate position wearing and tearing and spare parts consumption, realize accurate shearing, reduce safe risk and equipment loss, when the lubrication station is shut down, continue for equipment fuel feeding through the security personnel oil tank, guarantee that equipment oil film bearing lubrication is normal, reduction equipment loss during rotation inertial parking. The safety risk and the equipment loss are reduced, meanwhile, a one-way valve is arranged between the pump and the high-speed wire rod equipment, a one-way valve is also arranged on an air inlet pipeline between the safety oil tank and the air inlet electromagnetic valve, the high-speed wire rod equipment returns lubricating oil to a thin oil lubricating station through an oil return pipeline, the safety oil tank is communicated with the thin oil lubricating station through an exhaust pipeline, when the security oil tank needs to exhaust, the oil and the gas in the security oil tank are conveyed to a thin oil lubrication station together, so that the oil return and oil leakage are avoided during the operation of the whole system, the security oil tank is more environment-friendly and safer, and the air inlet electromagnetic valve and the air outlet electromagnetic valve can be manually or automatically controlled by the PLC controller, thereby improving the working safety and convenience, the method can realize the purpose of green energy-saving and production-reduction, accords with the trend of enterprise development and social progress, and has strong popularization.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the connection structure of the controller of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1: as shown in fig. 1, a controllable environmental protection safety device for supplying lubricating oil to a high-speed area of a wire rod comprises:
the lubricating oil lubricating station 1 is used for conveying the lubricating oil to the high-speed wire rod equipment 12 through an oil supply pipeline, and the high-speed wire rod equipment 12 returns the lubricating oil to the lubricating station 1 through an oil return pipeline;
the safety oil tank 6 is arranged on a pipeline between the thin oil lubrication station 1 and the wire high-speed driving equipment 12 and is communicated with each other; the safety oil tank 6 is provided with a liquid level meter 5 for checking the safety liquid level, meanwhile, the safety oil tank 6 is communicated with the thin oil lubrication station 1 through an exhaust pipeline, when the safety oil tank 6 needs to exhaust, the oil and the gas in the safety oil tank 6 are conveyed to the thin oil lubrication station 1 together, and the exhaust pipeline is provided with an exhaust electromagnetic valve 11; the security oil tank 6 is also communicated with compressed air through an air inlet pipeline, and an air inlet electromagnetic valve 8 is arranged on the air inlet pipeline; an air charging one-way valve 9 is also arranged on an air inlet pipeline between the security oil tank 6 and the air inlet electromagnetic valve to ensure that the oil does not leak. The safety oil tank 6 is also provided with a safety valve 10;
the pump 2 is arranged on an oil supply pipeline between the thin oil lubrication station 1 and the security oil tank 6, and the pump 2 pumps the lubricating oil in the thin oil lubrication station 1 to the security oil tank 6 or the high-speed wire equipment 12;
the controller 14 is further included, and the controller 14 is electrically connected with the air inlet electromagnetic valve 8 and the air outlet electromagnetic valve 11 respectively; the controller 14 is a PLC (programmable logic controller) 14, a wireless receiving device 15 is arranged on the PLC 14, an operator controls the air inlet electromagnetic valve 8 and the air outlet electromagnetic valve 11 through a remote controller, and a wireless sending device and a control key which are matched with the remote controller are arranged on the remote controller.
An electric contact pressure gauge 13 is arranged at the outlet of the pump 2, the electric contact pressure gauge 13 is also electrically connected with the controller 14,
the oil supply pipelines of the inlet and the outlet of the security oil tank 6 are respectively provided with an oil tank inlet one-way valve 4 and an oil tank outlet one-way valve 7. The lubricating oil is ensured not to return oil when entering and exiting the safety oil tank 6.
The lubricating oil delivery device is characterized by further comprising an oil inlet bypass pipeline, one end of the oil inlet bypass pipeline is communicated with the pump 2, lubricating oil pumped out by the pump 2 from the thin oil lubrication station 1 is directly conveyed to the high-speed wire rod equipment 12 through the oil inlet bypass pipeline, and an oil pump outlet one-way valve 3 is arranged on the pump 2 and the high-speed wire rod equipment 12 to ensure that the oil is not leaked.
The high speed wire rod equipment 12 is finish rolling and pre-finish rolling equipment.
When the invention is used, when the liquid level of the liquid level meter 5 is lower than a safety value, the thin oil lubrication station 1 supplies oil to a security oil tank 6 through the pump 2, and simultaneously, the controller 14 closes the air inlet electromagnetic valve 8 and opens the air outlet electromagnetic valve 11;
when the liquid level of the liquid level meter 5 reaches or is higher than a safety value, the controller 14 opens the air inlet electromagnetic valve 8 and closes the air outlet electromagnetic valve 11, so that the oil supply safety is ensured.
When the pump 2 is in failure, the high-speed wire rod device 12 is stopped emergently, the controller 14 obtains a pump stop signal of the electric contact pressure gauge 13, the controller 14 controls the exhaust electromagnetic valve 11 to be closed, and the air inlet electromagnetic valve 8 to be opened, so that the lubricating oil in the safety oil tank 6 is conveyed to the high-speed wire rod device 12 until the high-speed wire rod device 12 is stopped stably, and lubrication of an oil film bearing during inertial stopping of the high-speed wire rod device 12 is guaranteed;
when the pump 2 is normal, the controller 14 obtains a pump starting signal of the electro-contact pressure gauge 13, the controller 14 controls the exhaust electromagnetic valve 11 to be opened, and the intake electromagnetic valve 8 to be closed, so that the lubricating oil in the thin oil lubrication station 1 is conveyed into the security oil tank 6 until the liquid level of the liquid level meter 5 reaches or is higher than a safety value.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A controllable environmental protection safety device for supplying lubricating oil to a high-speed area of a wire rod, which is characterized by comprising:
the lubricating oil feeding device comprises a thin oil lubricating station (1), wherein the thin oil lubricating station (1) conveys the lubricating oil to high-speed wire rod equipment (12) through an oil supply pipeline, and the high-speed wire rod equipment (12) returns the lubricating oil to the thin oil lubricating station (1) through an oil return pipeline;
the safety oil tank (6) is arranged on a pipeline between the thin oil lubrication station (1) and the wire high-speed driving device (12) and is communicated with each other; the safety oil tank (6) is provided with a liquid level meter (5) for checking the safety liquid level, meanwhile, the safety oil tank (6) is communicated with the thin oil lubrication station (1) through an exhaust pipeline, the exhaust pipeline is used for conveying the oil and the gas in the safety oil tank (6) to the thin oil lubrication station (1), and the exhaust pipeline is provided with an exhaust electromagnetic valve (11); the safety oil tank (6) is also communicated with compressed air through an air inlet pipeline, and an air inlet electromagnetic valve (8) is arranged on the air inlet pipeline;
the pump (2), the said pump (2) is set up in the oil supply pipeline between said thin oil lubrication station (1) and security oil tank (6), the said pump (2) pumps the lubricating oil in the said thin oil lubrication station (1) to the said security oil tank (6) or high-speed wire rod apparatus (12);
an inflation one-way valve (9) is also arranged on the air inlet pipeline between the security oil tank (6) and the air inlet electromagnetic valve (8); an oil tank inlet one-way valve (4) and an oil tank outlet one-way valve (7) are respectively arranged on oil supply pipelines of an inlet and an outlet of the security oil tank (6); the pump (2) and the high-speed wire equipment (12) are provided with an oil pump outlet one-way valve (3);
the device is characterized by further comprising a controller (14), when the liquid level of the liquid level meter (5) is lower than a safety value, the thin oil lubrication station (1) needs to supply oil to the security oil tank (6) through the pump (2), and the controller (14) controls the air inlet electromagnetic valve (8) to be closed and the air exhaust electromagnetic valve (11) to be opened; when the liquid level of the liquid level meter (5) reaches or is higher than a safety value, the controller (14) controls to open the air inlet electromagnetic valve (8) and close the air outlet electromagnetic valve (11), so that the oil supply safety is ensured.
2. Controlled environmental protection safety device for the lubricating oil supply of the high-speed area of the wire rod according to claim 1, characterized in that an electric contact pressure gauge (13) is arranged at the outlet of the pump (2), the electric contact pressure gauge (13) is also electrically connected with the controller (14),
when the pump (2) is in fault, the high-speed wire rod equipment (12) is stopped emergently, the controller (14) obtains a pump stop signal of an electric contact pressure gauge (13), the controller (14) controls the exhaust electromagnetic valve (11) to be closed, and the air inlet electromagnetic valve (8) is opened, so that lubricating oil in the safety oil tank (6) is conveyed to the high-speed wire rod equipment (12) until the high-speed wire rod equipment (12) is stopped stably, and lubrication of an oil film bearing during inertial stopping of the high-speed wire rod equipment (12) is guaranteed;
after the pump (2) is normal, the controller (14) obtains a pump starting signal of an electric contact pressure gauge (13), the controller (14) controls the exhaust electromagnetic valve (11) to be opened, and the air inlet electromagnetic valve (8) is closed, so that lubricating oil in the thin oil lubrication station (1) is conveyed into the safety oil tank (6) until the liquid level of the liquid level meter (5) reaches or is higher than a safety value.
3. The controllable environmental protection safety device for lubricating oil supply in the wire high-speed area as claimed in claim 1, characterized by further comprising an oil inlet bypass pipeline, wherein one end of the oil inlet bypass pipeline is communicated with the pump (2), and lubricating oil in the thin oil lubrication station (1) pumped by the pump (2) is directly conveyed to the high-speed wire device (12) through the oil inlet bypass pipeline.
4. The controlled environmental protection safety device for supplying lubricating oil in high-speed areas of wire rods according to claim 1, characterized in that a safety valve (10) is arranged on the safety oil tank (6).
5. The controllable environment-friendly safety device for supplying lubricating oil to the high-speed area of the wire rod according to claim 1, wherein the controller (14) is a PLC (programmable logic controller) controller (14), a wireless receiving device (15) is arranged on the PLC controller (14), an operator controls the air inlet electromagnetic valve (8) and the air outlet electromagnetic valve (11) through a remote controller, and a wireless sending device and a control key which are matched with the remote controller are arranged on the remote controller.
6. A controlled environmental protection safety device for the lubrication oil supply of high speed section of wire according to any of claims 1 to 5, characterized in that said high speed wire equipment (12) is a finishing and pre-finishing equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011427646.XA CN112524468A (en) | 2020-12-09 | 2020-12-09 | Controllable environment-friendly safety device for supplying lubricating oil in wire high-speed area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011427646.XA CN112524468A (en) | 2020-12-09 | 2020-12-09 | Controllable environment-friendly safety device for supplying lubricating oil in wire high-speed area |
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| Publication Number | Publication Date |
|---|---|
| CN112524468A true CN112524468A (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011427646.XA Pending CN112524468A (en) | 2020-12-09 | 2020-12-09 | Controllable environment-friendly safety device for supplying lubricating oil in wire high-speed area |
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| CN (1) | CN112524468A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006224141A (en) * | 2005-02-17 | 2006-08-31 | Nippon Steel Corp | Lubricating oil-supplying equipment in cold rolling, and cold rolling method |
| CN200964348Y (en) * | 2006-10-16 | 2007-10-24 | 飞翼集团有限公司 | Pressure vessel oil supplying device for rare oil circulation lubricating system lubricating oil feeding |
| CN201526793U (en) * | 2009-10-26 | 2010-07-14 | 飞翼集团有限公司 | Oil supply device for emergency of thin oil lubrication station |
| 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 |
| CN104456034B (en) * | 2014-12-31 | 2017-11-03 | 马钢(集团)控股有限公司 | The protective device of Diagnosing System for Oil Pump lubrication thin oil system |
| CN207364626U (en) * | 2017-08-29 | 2018-05-15 | 山西通才工贸有限公司 | A kind of liquid level automatic adjustment stores oil pressure tank |
| CN211315065U (en) * | 2019-12-30 | 2020-08-21 | 北京首铁天佑科技有限公司 | Locomotive gear box oil changing device |
-
2020
- 2020-12-09 CN CN202011427646.XA patent/CN112524468A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006224141A (en) * | 2005-02-17 | 2006-08-31 | Nippon Steel Corp | Lubricating oil-supplying equipment in cold rolling, and cold rolling method |
| CN200964348Y (en) * | 2006-10-16 | 2007-10-24 | 飞翼集团有限公司 | Pressure vessel oil supplying device for rare oil circulation lubricating system lubricating oil feeding |
| CN201526793U (en) * | 2009-10-26 | 2010-07-14 | 飞翼集团有限公司 | Oil supply device for emergency of thin oil lubrication station |
| CN104456034B (en) * | 2014-12-31 | 2017-11-03 | 马钢(集团)控股有限公司 | The protective device of Diagnosing System for Oil Pump lubrication thin oil system |
| 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 |
| CN207364626U (en) * | 2017-08-29 | 2018-05-15 | 山西通才工贸有限公司 | A kind of liquid level automatic adjustment stores oil pressure tank |
| CN211315065U (en) * | 2019-12-30 | 2020-08-21 | 北京首铁天佑科技有限公司 | Locomotive gear box oil changing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Application publication date: 20210319 |