CN111577406A - Three-taking two-hydraulic shutoff protection device with online verification function - Google Patents
Three-taking two-hydraulic shutoff protection device with online verification function Download PDFInfo
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- CN111577406A CN111577406A CN202010401149.6A CN202010401149A CN111577406A CN 111577406 A CN111577406 A CN 111577406A CN 202010401149 A CN202010401149 A CN 202010401149A CN 111577406 A CN111577406 A CN 111577406A
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- 238000012795 verification Methods 0.000 title claims abstract description 56
- 238000000605 extraction Methods 0.000 claims 2
- 230000000740 bleeding effect Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a three-taking two-hydraulic shutoff protection device with an online verification function, which comprises three groups of oil valves, a safety oil passage and a safety oil discharge passage, wherein each group of oil valves comprises a first cartridge valve and a second cartridge valve, the first cartridge valve in each group of oil valves is also connected with an online verification pipeline, the online verification pipeline comprises a safety oil verification passage, an oil inlet branch with a first throttle hole and an oil discharge branch with a second throttle hole, the first cartridge valve is provided with a verification oil port communicated with the oil discharge port, two ends of the oil inlet branch are respectively communicated with the verification oil port and the safety oil verification passage, and two ends of the oil discharge branch are respectively communicated with the oil discharge port of the first cartridge valve and the safety oil discharge passage. The invention aims to solve the technical problem that a signal path when a unit operates can be adopted to carry out complete online verification on a steam turbine protection system, so that the aims of discharging relevant fault points in advance and ensuring the normal operation of the system are fulfilled.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to a three-taking two-hydraulic shutoff protection device with an online verification function.
Background
The steam turbine protection system is mainly used for finishing the function of shutting off and tripping the steam turbine when the steam turbine is in accident conditions or monitoring data is abnormal, and is the core of steam turbine protection. The trip-out function of the steam turbine is finally realized by a hydraulic trip-out device controlled by a protection system.
At present, a steam turbine protection system mainly adopts a three-taking two-hydraulic blocking device to complete the blocking and tripping functions of a steam turbine, and for example, the prior art with the publication number of CN102518485A discloses a nuclear power plant steam turbine trip oil return system in 6 months and 27 th of 2012, which is used for triggering the action of the steam turbine protection system when a nuclear power reactor or the steam turbine fails, so that a steam turbine stop gate protection oil circuit quickly returns oil to relieve pressure and stops. The technical scheme is as follows: the oil valves of the trip oil return system of the steam turbine of the nuclear power station are provided with three groups, two oil valve oil return cavities of each group are connected in series, and the oil return cavities of the groups are connected in parallel; the oil valve group comprises three oil valves, one oil valve group is connected with the oil valve group, the other oil valve group is connected with the oil valve group, and the oil valve group is connected with the oil valve group. In the technical scheme, the oil return of the oil valve is controlled by three electric control assemblies, as long as two or more than two of the three electric control assemblies are intact, the oil return is normal when the steam turbine protection action signal is received, and the oil return is avoided when only one electric control assembly receives the steam turbine protection action signal, so that the false operation probability can be effectively reduced, and the safety and the reliability of the operation of the steam turbine are both considered. However, the hydraulic blocking device cannot perform complete online verification on the turbine protection system by adopting a signal path during the operation of the unit under the condition that the normal operation of the unit is not influenced.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a three-taking two-hydraulic pressure interruption protection device with an online verification function.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a take three of online verification function to get hydraulic pressure shutoff protection device which characterized in that: including oil valve, safe oil route and safe oil route of releasing, the oil valve is three groups altogether, and every group oil valve includes first cartridge valve and second cartridge valve, the oil drain port of first cartridge valve and the oil inlet intercommunication of second cartridge valve, the oil inlet and the safe oil route intercommunication of first cartridge valve, the oil drain port and the safe oil route of releasing intercommunication of second cartridge valve, its characterized in that: the first cartridge valve in each group of oil valves is further connected with an online verification pipeline, the online verification pipeline comprises a safety oil verification passage, an oil inlet branch with a first throttling hole and an oil discharge branch with a second throttling hole, a verification oil port communicated with the oil discharge port is formed in the first cartridge valve, two ends of the oil inlet branch are communicated with the verification oil port and the safety oil verification passage respectively, and two ends of the oil discharge branch are communicated with the oil discharge port of the first cartridge valve and the safety oil discharge passage respectively.
In each group of oil valves, a pressure monitor is arranged between an oil outlet of the first cartridge valve and an oil inlet of the second cartridge valve.
The relief oil verification passage communicates with a pressure oil passage of the steam turbine through a verification orifice.
The first throttle hole and the second throttle hole are equal in hole diameter, and the flow area of the first throttle hole and the flow area of the second throttle hole are smaller than that of the conversion throttle hole.
The relief oil passage communicates with a pressure oil passage of the steam turbine through a shift orifice.
The invention has the advantages that:
1. the key improvement point of the invention is that an online verification pipeline is added on the basis of the existing three-taking hydraulic breaker device, and the online verification pipeline is reasonably connected to the existing three-taking hydraulic breaker device, so that the online active verification of the system function can be periodically carried out by adopting a signal path when the unit operates under the condition of not influencing the normal operation of the unit, thereby achieving the purposes of discharging related fault points in advance and ensuring the normal operation of the system.
2. According to the invention, the pressure monitor is arranged between the oil outlet of the first cartridge valve and the oil inlet of the second cartridge valve in each group of oil valves, and an oil pressure measurement mode which is more favorable for realization is used for replacing other measurement modes, so that the action condition of each component can be represented, and the smoothness of the oil path section can be more directly reflected.
3. The invention communicates the safety oil verification path with the pressure oil path of the steam turbine through the verification throttle hole, and has the advantages that the online verification test is carried out without providing oil flow conditions from the outside; and meanwhile, the influence of the throttling hole on other working oil ways during the test is verified.
4. The invention has the advantages that the on-line verification accuracy can be detected through pressure change, thereby being beneficial to effectively discharging related fault points and ensuring the normal operation of the system.
5. The safety oil passage is communicated with the pressure oil passage through the conversion throttling hole, and the device has the advantages that the pressure oil can be directly converted into the safety oil for use, so that when the device is used for a steam turbine control system, other equipment is not needed to provide the safety oil for the device, and on the contrary, the device can also be used as a supply source of the system safety oil to provide the safety oil for other equipment, so that the whole control system is simplified.
Drawings
FIG. 1 is a schematic structural view of the present invention;
labeled as: 1. the electromagnetic valve, 2, the first cartridge valve, 3, the second cartridge valve, 4, the pressure oil passage, 5, the pressure oil discharge passage, 6, the safety oil passage, 7, the safety oil discharge passage, 8, the switching orifice, 9, the pressure monitor, 10, the safety oil verification passage, 11, the first orifice, 12, the oil inlet branch, 13, the second orifice, 14, the oil discharge branch, 15, the verification orifice.
Detailed Description
The invention discloses a three-taking two-hydraulic shutoff protection device with an online verification function, which comprises an oil valve, an electromagnetic valve 1, a pressure oil passage 4, a pressure oil discharge passage 5, a safety oil passage 6 and a safety oil discharge passage 7. The components, positions and connection relations of the components are as follows:
the relief oil passage 6 communicates with the pressure oil passage 4 of the steam turbine through a shift orifice 8, and the relief oil in the relief oil passage 6 is formed by the pressure oil in the pressure oil passage 4 passing through the shift orifice 8.
The electromagnetic valve 1 comprises an oil inlet end, a first oil discharge end and a second oil discharge end, the number of the electromagnetic valves 1 is three, the oil inlet end of the electromagnetic valve 1 is communicated with the pressure oil passage 4, and the first oil discharge end of the electromagnetic valve 1 is communicated with the pressure oil discharge passage 5.
The oil valves are divided into three groups, each group of oil valves comprises a first cartridge valve 2 and a second cartridge valve 3, the first cartridge valve 2 and the second cartridge valve 3 respectively comprise an oil inlet, an oil outlet and a control oil port, the oil outlet of the first cartridge valve 2 is communicated with the oil inlet of the second cartridge valve 3, the oil inlet of the first cartridge valve 2 is communicated with a safety oil channel, and the oil outlet of the second cartridge valve 3 is communicated with a safety oil release passage 7. Each group of oil valves is respectively communicated with the second oil discharge ends of two of the electromagnetic valves 1, namely, the three electromagnetic valves 1 are divided into three groups in pairs and in groups and respectively correspondingly connected with the three groups of oil valves; specifically, in each group of oil valves, the control oil port of the first cartridge valve 2 and the control oil port of the second cartridge valve 3 are respectively communicated with the second oil discharge ends of two electromagnetic valves 1 in one group. When the electromagnetic valve 1 is electrified, the oil inlet end of the electromagnetic valve 1 is not communicated with the first oil outlet end and is communicated with the second oil outlet end, and at the moment, pressure oil enters the oil valve connected with the electromagnetic valve 1 through the oil inlet end and the second oil outlet end. When the electromagnetic valve 1 is powered off, the first oil discharge end of the electromagnetic valve 1 is communicated with the second oil discharge end, the oil inlet end is not communicated with the first oil discharge end and the second oil discharge end, and pressure oil in the oil valve enters the pressure oil discharge passage 5 connected with the electromagnetic valve 1 through the second oil discharge end and the first oil discharge end.
In the scheme, the first cartridge valve 2 in each group of oil valves is further connected with an online verification pipeline, the online verification pipeline comprises a safety oil verification passage 10, an oil inlet branch 12 with a first throttling hole 11 and an oil discharge branch 14 with a second throttling hole 13, the safety oil verification passage 10 is communicated with a pressure oil passage 4 of the steam turbine through a verification throttling hole 15, a verification oil port communicated with the oil discharge port all the time is formed in the first cartridge valve 2, two ends of the oil inlet branch 12 are respectively communicated with the verification oil port and the safety oil verification passage 10, two ends of the oil discharge branch 14 are respectively communicated with the oil discharge port of the first cartridge valve 2 and the safety oil discharge passage 7, and preferably, an external tee joint of the oil discharge port of the first cartridge valve 2 is respectively communicated with an oil inlet and the oil discharge branch 14 of the second cartridge valve 3. The first orifice 11 and the second orifice 13 have the same diameter, and the flow areas of the first orifice 11 and the second orifice 13 are both smaller than the flow area of the switching orifice 8, specifically, the diameter ranges of the first orifice 11 and the second orifice 13 are 0.8-0.5 mm, and the diameter ranges of the switching orifice 8 are 4.0-3.0 mm.
Further, in each set of oil valves, a pressure monitor 9 is arranged between the oil outlet of the first cartridge valve 2 and the oil inlet of the second cartridge valve 3. The pressure monitor 9 can use pressure transmitter and/or pressure switch group (including pressure gauge with remote contact or non-remote pressure gauge), and uses the change of pressure value at the measuring point to monitor and feed back the activity test. The pressure monitor 9 can adopt different types of pressure detection devices to obtain different feedback signals, for example, an analog signal can be obtained by adopting a pressure transmitter, and a switching value signal can be obtained by adopting a pressure switch group (comprising a pressure gauge with a remote transmission contact); if the in-situ monitoring is carried out, a non-remote pressure gauge can be adopted.
When the scheme is implemented specifically, the electromagnetic valve 1 adopts a safety rule of power-off interruption action. The components are connected into a whole as shown in FIG. 1, and the logic relationship of the interruption action is as follows:
when the steam turbine normally operates, the three electromagnetic valves 1 are all kept electrified, and at the moment, the oil inlet end of each electromagnetic valve 1 is not communicated with the first oil discharge end and is communicated with the second oil discharge end. Accordingly, the second drain end of each solenoid valve 1 communicates with the corresponding associated first cartridge valve 2 and second cartridge valve 3, respectively. Pressure oil in the pressure oil passage 4 firstly enters the electromagnetic valve 1 through the oil inlet end, then enters the three groups of oil valves through the second oil discharge end and the control oil port, then the valve core of the cartridge valve moves downwards and blocks the oil inlet under the action of the pressure oil, and the safety oil does not enter the safety oil discharge passage 7 for discharge.
When the steam turbine is abnormally required to be interrupted, any two electromagnetic valves 1 are controlled to be powered off simultaneously, the third electromagnetic valve 1 is kept electrified, the first oil discharge ends of the two powered-off electromagnetic valves 1 are communicated with the second oil discharge end, and the oil inlet ends of the two powered-off electromagnetic valves 1 are not communicated with the first oil discharge end and the second oil discharge end. The pressure oil in the group of oil valves correspondingly connected with the two de-energized solenoid valves 1 enters the pressure oil discharge passage 5 through the second oil discharge end and the first oil discharge end to be discharged. As the pressure oil in the set of oil valves is discharged, the valve core of the first cartridge valve 2 and the valve core of the second cartridge valve 3 in the set of oil valves move upwards, and the oil inlet of the first cartridge valve 2 and the oil inlet of the second cartridge valve 3 are both opened. Correspondingly, in the set of oil valves, the oil inlet of the first cartridge valve 2 is respectively communicated with the oil outlet and the safety oil passage 6, the oil outlet of the first cartridge valve 2 is communicated with the oil inlet of the second cartridge valve 3, the oil outlet of the second cartridge valve 3 is communicated with the safety oil discharge passage 7, the whole safety oil discharge passage 7 is opened, the safety oil in the safety oil passage 6 enters from the oil inlet of the first cartridge valve 2 in the set of oil valves and enters the second cartridge valve 3 through the oil outlet of the first cartridge valve 2 and the oil inlet of the second cartridge valve 3, and then enters the safety oil discharge passage 7 through the oil outlet of the second cartridge valve 3 to be discharged. And since the third solenoid valve 1 is charged, the relief oil drain passages 7 of the two sets of oil valves connected to the third solenoid valve 1 are kept closed.
Through the logic relation, the three-out-of-two blocking control of the blocking device is realized.
When the scheme is used for online verification, all parts are connected into a whole as shown in fig. 1, and the online activity verification logic relationship is as follows:
when any one electromagnetic valve 1 is de-energized and the other two electromagnetic valves 1 are kept energized, pressure oil in two cartridge valves (a first cartridge valve 2 and a second cartridge valve 3, but the first cartridge valve 2 and the second cartridge valve 3 do not belong to the same group of oil valves) connected with the de-energized electromagnetic valve 1 is discharged, safety oil in a safety oil channel enters the first cartridge valve 2 through an oil inlet, an oil passing state at an oil outlet of the first cartridge valve 2 is changed from that before the electromagnetic valve 1 is de-energized, a verification orifice 15 is connected with a first orifice 11 in series for oil supply, then oil discharge is changed from a second orifice 13 into that a verification orifice 15 is connected with the first orifice 11 in series for oil supply, and oil supply is added to a switching orifice 8 (safety oil supply in a safety oil channel) and then discharged from the second orifice 13, since the transfer orifice 8 is added to supply oil without change in drain, the pressure at the drain of the first cartridge valve 2 will increase compared to before line activity verification.
Meanwhile, the oil outlet of the second cartridge valve 3 is communicated with the safety oil discharge passage 7, the oil passing state at the oil inlet of the second cartridge valve 3 is verified by connecting the verification orifice 15 with the first orifice 11 in series before the electromagnetic valve 1 is de-energized, and is supplied with oil through the drain port of the first cartridge valve 2 connected thereto (since the verification port is always communicated with the drain port of the first cartridge valve 2, oil can be supplied there always), and is drained through the second orifice 13 to become the verification orifice 15 connected in series with the first orifice 11, and supplied through the drain port of the first cartridge valve 2 connected thereto, and discharged through the second orifice 13 together with the drain port of the second cartridge valve 3, since the drain port of the second cartridge valve 3 is additionally drained in addition to the original drain through the second orifice 13 in terms of draining, the oil supply is unchanged, so the pressure at the oil inlet of the second cartridge valve 3 is reduced compared to that before the verification of the line activity.
Through the logic relation, the on-line activity test of the breaking device is realized.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (5)
1. The utility model provides a take three of online verification function to get hydraulic pressure shutoff protection device which characterized in that: including the oil valve, safe oil route (6) and safe oil route (7) of releasing, the oil valve is three groups altogether, every group oil valve includes first cartridge valve (2) and second cartridge valve (3), the oil drain port of first cartridge valve (2) and the oil inlet intercommunication of second cartridge valve (3), the oil inlet and the safe oil passageway intercommunication of first cartridge valve (2), the oil drain port and the safe oil route (7) of releasing of second cartridge valve (3) communicate, its characterized in that: first cartridge valve (2) in every group oil valve still is connected with the online pipeline of verifying, verify the pipeline including safe oil verify passageway (10), take oil feed branch road (12) of first orifice (11) and take oil extraction branch road (14) of second orifice (13) online, seted up on first cartridge valve (2) with the communicating oil port of verifying of oil drain port, the both ends of oil feed branch road (12) verify passageway (10) with verifying the oil port and safe oil respectively and communicate, the both ends of oil extraction branch road (14) communicate with the oil drain port and the safe oil of first cartridge valve (2) route (7) of bleeding respectively.
2. The three-taking-out two-hydraulic shutoff protection device with the online verification function according to claim 1, characterized in that: in each group of oil valves, a pressure monitor (9) is arranged between an oil discharge port of the first cartridge valve (2) and an oil inlet of the second cartridge valve (3).
3. The three-taking two-hydraulic shutoff protection device with the online verification function according to claim 1 or 2, characterized in that: the safety oil verification passage (10) is communicated with a pressure oil passage (4) of the steam turbine through a verification throttle hole (15).
4. The three-taking-out two-hydraulic shutoff protection device with the online verification function according to claim 3, characterized in that: the first throttle hole (11) and the second throttle hole (13) are equal in hole diameter, and the flow area of the first throttle hole (11) and the flow area of the second throttle hole (13) are smaller than that of the switching throttle hole (8).
5. The three-taking-out two-hydraulic shutoff protection device with the online verification function according to claim 1, characterized in that: the relief oil passage (6) communicates with a pressure oil passage (4) of the steam turbine through a shift orifice (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010401149.6A CN111577406B (en) | 2020-05-13 | 2020-05-13 | Three-out-two hydraulic interruption protection device with online verification function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010401149.6A CN111577406B (en) | 2020-05-13 | 2020-05-13 | Three-out-two hydraulic interruption protection device with online verification function |
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| Publication Number | Publication Date |
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| CN111577406A true CN111577406A (en) | 2020-08-25 |
| CN111577406B CN111577406B (en) | 2024-10-25 |
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| CN202010401149.6A Active CN111577406B (en) | 2020-05-13 | 2020-05-13 | Three-out-two hydraulic interruption protection device with online verification function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638809A (en) * | 2021-07-26 | 2021-11-12 | 中国联合重型燃气轮机技术有限公司 | Emergency breaking device for heavy combustion engine |
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| CN2703873Y (en) * | 2003-11-07 | 2005-06-08 | 东方汽轮机厂 | Oil-way main-break protective velve assembly for steam turbine safety system |
| CN103982249A (en) * | 2014-05-04 | 2014-08-13 | 上海汇益控制系统股份有限公司 | Emergency trip device capable of isolating testing signal |
| CN205744011U (en) * | 2016-05-18 | 2016-11-30 | 上海华电电力发展有限公司 | A kind of optimization overspeed test of steam turbine logic device |
| CN110242363A (en) * | 2019-03-14 | 2019-09-17 | 华电电力科学研究院有限公司 | A kind of protection system of the high security for Turbo-generator Set |
| CN212177236U (en) * | 2020-05-13 | 2020-12-18 | 东方电气自动控制工程有限公司 | Steam turbine protection device integrating online verification |
-
2020
- 2020-05-13 CN CN202010401149.6A patent/CN111577406B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2703873Y (en) * | 2003-11-07 | 2005-06-08 | 东方汽轮机厂 | Oil-way main-break protective velve assembly for steam turbine safety system |
| CN103982249A (en) * | 2014-05-04 | 2014-08-13 | 上海汇益控制系统股份有限公司 | Emergency trip device capable of isolating testing signal |
| CN205744011U (en) * | 2016-05-18 | 2016-11-30 | 上海华电电力发展有限公司 | A kind of optimization overspeed test of steam turbine logic device |
| CN110242363A (en) * | 2019-03-14 | 2019-09-17 | 华电电力科学研究院有限公司 | A kind of protection system of the high security for Turbo-generator Set |
| CN212177236U (en) * | 2020-05-13 | 2020-12-18 | 东方电气自动控制工程有限公司 | Steam turbine protection device integrating online verification |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638809A (en) * | 2021-07-26 | 2021-11-12 | 中国联合重型燃气轮机技术有限公司 | Emergency breaking device for heavy combustion engine |
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| CN111577406B (en) | 2024-10-25 |
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