CN116464691A - Monitoring method, system, equipment and medium suitable for hydraulic oil leakage - Google Patents
Monitoring method, system, equipment and medium suitable for hydraulic oil leakage Download PDFInfo
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- CN116464691A CN116464691A CN202210032046.6A CN202210032046A CN116464691A CN 116464691 A CN116464691 A CN 116464691A CN 202210032046 A CN202210032046 A CN 202210032046A CN 116464691 A CN116464691 A CN 116464691A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 32
- 239000010720 hydraulic oil Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 89
- 239000003921 oil Substances 0.000 claims abstract description 62
- 230000008859 change Effects 0.000 claims abstract description 32
- 230000005856 abnormality Effects 0.000 claims abstract description 10
- 238000007619 statistical method Methods 0.000 claims abstract description 7
- 238000004590 computer program Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 4
- 238000012806 monitoring device Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000013500 data storage Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/007—Simulation or modelling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/005—Leakage; Spillage; Hose burst
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/857—Monitoring of fluid pressure systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/87—Detection of failures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a monitoring method suitable for hydraulic oil leakage, which comprises the following steps: step S1: acquiring and storing liquid level signals, analog quantities and real models corresponding to a hydraulic system; step S2: extracting historical data of the hydraulic system under normal conditions, and carrying out probability statistical analysis to obtain a range of liquid level change under the normal conditions; step S3: selecting a set time period to monitor the liquid level in real time and reading a real-time liquid level value; step S4: and analyzing the change trend of the liquid level value in the current set time period, and judging that the liquid level is reduced beyond the normal condition and the oil leakage abnormality exists if the slope is reduced beyond the set range and is continued within the set time range. According to the invention, by collecting the liquid level signal of the hydraulic system and utilizing a big data technology, the historical data of the liquid level signal is analyzed, the range of liquid level change under normal conditions is obtained, the actual change of the liquid level in a current period of time is compared, and if the actual change of the liquid level exceeds the set range, an alarm is given, the liquid level change is abnormal, and oil leakage abnormality can exist.
Description
Technical Field
The invention relates to the technical field of oil leakage monitoring, in particular to a monitoring method, a system, equipment and a medium suitable for hydraulic oil leakage.
Background
Hydraulic systems are a source of power for many manufacturing industries, particularly in the steel industry, where hydraulically driven equipment includes rolling mill presses, various types of valves, coil carts, and the like. Whether the hydraulic system operates normally or not directly relates to production of the production line is an important object of attention of production line equipment. The hydraulic system is generally composed of an oil reservoir, a pipeline, a hydraulic pump, a valve and corresponding detection sensors, such as a liquid level meter, a thermometer, a pressure meter and the like, hydraulic oil conveyed by the hydraulic pump flows back into the oil reservoir through the pipeline to form a loop, and hydraulic power is conveyed to a production line.
Oil leakage is a persistent problem in hydraulic systems. The problem of oil leakage often occurs in hydraulic oil reservoirs or pipelines due to mechanical structures, construction or use time. The direct economic loss is brought, the environment is influenced, meanwhile, the hydraulic stop is caused by the liquid level drop after oil leakage, the production line stops producing, and more serious, the oil leakage causes great potential safety risk. Although the oil reservoir is usually provided with a corresponding liquid level meter, the liquid level change caused by oil leakage is a relatively slow process, the liquid level meter cannot realize process monitoring, and an alarm signal can be sent only when the liquid level reaches a warning line. Therefore, monitoring the process change of the liquid level, monitoring anomalies such as oil leakage and the like is an important content for maintaining the stable operation of the hydraulic system.
Through searching, patent document CN203067415U discloses a bucket hydraulic oil leakage monitoring system, which comprises an oil guide pipe, an oil cylinder wall, a piston, a plug handle, an oil pressure power system and a sensing monitoring system, wherein an oil pressure data sensing module is arranged on the inner side of the oil cylinder wall. The sensing monitoring system consists of an output oil pressure control module, an oil pressure data sensing module, an oil pressure data comparison module, a pressure transmission data storage module and a pressure measurement data storage module. The output oil pressure control module is respectively and electrically connected with the pressure transmission data storage module and the oil pressure power system. The oil pressure data sensing module is electrically connected with the oil pressure data measuring storage module. The oil pressure data comparison module is respectively and electrically connected with the pressure transmission data storage module and the pressure measurement data storage module. And comparing and detecting whether the hydraulic equipment of the bucket leaks oil or not through the front and rear oil pressure data. The prior art can only detect whether the hydraulic system leaks oil through the sensing equipment, can not infer whether the hydraulic system leaks oil according to time in a big data analysis mode, has low accuracy, and can not make a pre-judgment on the oil leakage condition.
Patent document CN202100390U discloses a special hydraulic oil leakage collecting and recovering device for wind turbines, which consists of an oil receiving box and an oil collecting pot, wherein the box body of the oil receiving box consists of an aluminum plate, the top end of the oil receiving box is open, a filter screen bracket is fixedly arranged at the bottommost end in the oil receiving box, a filter screen is additionally arranged on the filter screen bracket, a flange plate with a mounting hole is fixedly arranged on the peripheral wall of the side of the oil receiving box, the filter screen is fixedly arranged on the filter screen bracket through bolts inserted into the mounting hole in a matched manner, the inner bottom wall of the oil receiving box is integrally covered by the filter screen, an oil leakage hole is formed in the bottom wall of the oil receiving box, the oil leakage hole is connected with an end pipe orifice of an oil conveying hose, the other end pipe orifice of the oil conveying hose is connected with a pot orifice of the oil collecting pot, and a box cavity of the oil receiving box is communicated with the oil collecting pot through the oil conveying hose. This prior art is through on current old type wind turbine, collect, filter and retrieve its hydraulic oil that leaks, and its focus is how to retrieve the hydraulic oil that leaks, and not the problem of how to monitor the hydraulic equipment oil leak is solved.
Therefore, there is a need to develop and design a system and a method capable of monitoring and early warning of oil leakage abnormality in real time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a monitoring method, a system, equipment and a medium suitable for hydraulic oil leakage, which are used for monitoring the liquid level change of a hydraulic system, monitoring whether the oil leakage is abnormal in real time and alarming in the initial period of the oil leakage in time so as to ensure that operators can find and process early and avoid serious faults of production line shutdown.
The invention provides a monitoring method suitable for hydraulic oil leakage, which comprises the following steps:
step S1: acquiring and storing liquid level signals, analog quantities and real models corresponding to a hydraulic system;
step S2: extracting historical data of the hydraulic system under normal conditions from the liquid level signals, the analog quantity and the actual model, and carrying out probability statistical analysis to obtain a liquid level change range under the normal conditions;
step S3: selecting a set time period to monitor the liquid level in real time and reading a real-time liquid level value;
step S4: and analyzing the change trend of the liquid level value in the current set time period, and judging that the liquid level is reduced beyond the normal condition and the oil leakage abnormality exists if the slope is reduced beyond the set range and is continued within the set time range.
Preferably, the analog quantity in step S1 refers to a value that continuously varies in time and value.
Preferably, the real form in step S1 is a floating point number, which is a decimal number with a decimal number.
Preferably, in step S2, the hydraulic system is normally operated by the device, and the liquid level fluctuates, but the fluctuation is stable within a set range.
Preferably, the setting range of the slope decrease in step S4 is that the slope of the liquid level decrease continuously exceeds the setting value of the slope of the liquid level decrease under the normal working condition in the statistical setting time, and the oil leakage is considered.
Preferably, the slope formula for calculating the liquid level change of the adjacent sampling points in step S4 is: an= (Vn-1)/(Tn-1); n is the sample number and the overall slope of a period is the moving average of the slopes of all neighboring points in the period, i.e., a= (a1+a2+a3+ … +an)/n.
According to the invention, a monitoring system suitable for hydraulic oil leakage comprises:
module M1: acquiring and storing liquid level signals, analog quantities and real models corresponding to a hydraulic system;
module M2: extracting historical data of the hydraulic system under normal conditions, and carrying out probability statistical analysis to obtain a range of liquid level change under the normal conditions;
module M3: selecting a set time period to monitor the liquid level in real time and reading a real-time liquid level value;
module M4: and analyzing the change trend of the liquid level value in the current set time period, and judging that the liquid level is reduced beyond the normal condition and the oil leakage abnormality exists if the slope is reduced beyond the set range and is continued within the set time range.
According to the present invention there is provided a computer readable storage medium storing a computer program which when executed by a processor performs the steps of the method described above.
The monitoring device suitable for hydraulic oil leakage comprises the monitoring system suitable for hydraulic oil leakage or the computer readable storage medium storing the computer program.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, by collecting the liquid level signal of the hydraulic system and utilizing a big data technology, the historical data of the liquid level signal is analyzed, the range of liquid level change under normal conditions is obtained, the actual change of the liquid level in a current period of time is compared, and if the actual change of the liquid level exceeds the set range, an alarm is given, the liquid level change is abnormal, and oil leakage abnormality can exist.
2. The invention can be expanded to all scenes needing liquid level monitoring, and realizes the process monitoring and abnormal early warning of the liquid level.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of steps of a method for monitoring hydraulic oil leakage according to the present invention;
FIG. 2 is a graph of analysis of hydraulic fluid level change under normal versus abnormal conditions in the present invention;
FIG. 3 is a block diagram of a monitoring system for hydraulic oil leakage according to the present invention;
fig. 4 is a hydraulic fluid level change analysis chart of a monitoring system suitable for hydraulic oil leakage in the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
As shown in fig. 1 and 2, the invention provides a method for monitoring hydraulic oil leakage, which comprises the following steps:
step S1: acquiring and storing liquid level signals, analog quantities and real models corresponding to a hydraulic system; wherein analog refers to a value that continuously varies in time and value. The real form is a floating point number, which is a decimal number with decimal numbers.
Step S2: extracting historical data of the hydraulic system under normal conditions from the liquid level signals, the analog quantity and the actual model, and carrying out probability statistical analysis to obtain a liquid level change range under the normal conditions; the hydraulic system is normally operated by the equipment, and the liquid level fluctuates, but the fluctuation is stable in a set range. Wherein, the historical data can be in half a year or 3 months, and the liquid level fluctuation is within 3 millimeters by utilizing the data statistics of half a year.
Step S3: and selecting a set time period to monitor the liquid level in real time and reading a real-time liquid level value.
Step S4: and analyzing the change trend of the liquid level value in the current set time period, and judging that the liquid level is reduced beyond the normal condition and the oil leakage abnormality exists if the slope is reduced beyond the set range and is continued within the set time range. The setting range of the slope drop is that the slope of the liquid level drop continuously exceeds the setting value of the slope drop of the liquid level under the normal working condition in the setting time by statistics, and oil leakage is considered. Assuming a 20% slope of the drop in liquid level, typically-0.1% slope of the drop in liquid level, which is-0.2% for a certain period of time, the change in slope is: (-0.15% - -0.1%)/-0.1% = 50%, greater than the monitoring threshold 20%, the pipe is considered to have an oil leak anomaly.
The slope formula for calculating the liquid level change of the adjacent sampling points is as follows: an= (Vn-1)/(Tn-1); n is the sample number and the overall slope of a period is the moving average of the slopes of all neighboring points in the period, i.e., a= (a1+a2+a3+ … +an)/n.
As shown in fig. 3 and 4, the present invention further provides a monitoring system suitable for hydraulic oil leakage, including:
module M1: acquiring and storing liquid level signals, analog quantities and real models corresponding to a hydraulic system;
module M2: extracting historical data of the hydraulic system under normal conditions, and carrying out probability statistical analysis to obtain a range of liquid level change under the normal conditions;
module M3: selecting a set time period to monitor the liquid level in real time and reading a real-time liquid level value;
module M4: and analyzing the change trend of the liquid level value in the current set time period, and judging that the liquid level is reduced beyond the normal condition and the oil leakage abnormality exists if the slope is reduced beyond the set range and is continued within the set time range.
The invention further provides a computer readable storage medium storing a computer program which, when executed by a processor, performs the steps of the method described above.
The invention further provides a monitoring device suitable for hydraulic oil leakage, comprising the monitoring system suitable for hydraulic oil leakage or the computer readable storage medium storing the computer program.
Working principle:
the hydraulic liquid level change operation process is carried out by utilizing big data technology:
1. and accumulating half-year data, and statistically analyzing the liquid level fluctuation range of specific equipment in normal operation.
2. And data analysis is carried out by collecting the liquid level signal of the inlet hydraulic station.
3. And correcting the liquid level fluctuation range of the specific equipment during normal operation through online learning.
4. And analyzing the descending trend of the liquid level of the hydraulic station in real time, wherein the liquid level forms the descending trend and gives oil leakage early warning when exceeding the liquid level fluctuation range during normal operation of the equipment.
Those skilled in the art will appreciate that the invention provides a system and its individual devices, modules, units, etc. that can be implemented entirely by logic programming of method steps, in addition to being implemented as pure computer readable program code, in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units for realizing various functions included in the system can also be regarded as structures in the hardware component; means, modules, and units for implementing the various functions may also be considered as either software modules for implementing the methods or structures within hardware components.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (9)
1. The monitoring method suitable for hydraulic oil leakage is characterized by comprising the following steps:
step S1: acquiring and storing liquid level signals, analog quantities and real models corresponding to a hydraulic system;
step S2: extracting historical data of the hydraulic system under normal conditions from the liquid level signals, the analog quantity and the actual model, and carrying out probability statistical analysis to obtain a liquid level change range under the normal conditions;
step S3: selecting a set time period to monitor the liquid level in real time and reading a real-time liquid level value;
step S4: and analyzing the change trend of the liquid level value in the current set time period, and judging that the liquid level is reduced beyond the normal condition and the oil leakage abnormality exists if the slope is reduced beyond the set range and is continued within the set time range.
2. The method for monitoring hydraulic oil leakage according to claim 1, wherein the analog quantity in step S1 is a value that continuously varies in time and value.
3. The method according to claim 1, wherein the real model in the step S1 is a floating point number, and the floating point number is a decimal number with decimal.
4. The method according to claim 1, wherein the hydraulic system in step S2 is normally operated by a device, and the liquid level fluctuates, but the fluctuation is stabilized within a set range.
5. The method according to claim 1, wherein the slope of the slope decrease in step S4 is set to be equal to the oil leak if the slope of the liquid level decrease continuously exceeds the set value of the slope of the liquid level decrease under normal operation in the statistical setting time.
6. The method for monitoring hydraulic oil leakage according to claim 1, wherein the slope formula for calculating the liquid level change of the adjacent sampling points in the step S4 is: an= (Vn-1)/(Tn-1); n is the sample number and the overall slope of a period is the moving average of the slopes of all neighboring points in the period, i.e., a= (a1+a2+a3+ … +an)/n.
7. A monitoring system for hydraulic oil leakage, comprising:
module M1: acquiring and storing liquid level signals, analog quantities and real models corresponding to a hydraulic system;
module M2: extracting historical data of the hydraulic system under normal conditions, and carrying out probability statistical analysis to obtain a range of liquid level change under the normal conditions;
module M3: selecting a set time period to monitor the liquid level in real time and reading a real-time liquid level value;
module M4: and analyzing the change trend of the liquid level value in the current set time period, and judging that the liquid level is reduced beyond the normal condition and the oil leakage abnormality exists if the slope is reduced beyond the set range and is continued within the set time range.
8. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of any one of claims 1 to 6.
9. A monitoring device adapted for hydraulic oil leakage, characterized by comprising a monitoring system adapted for hydraulic oil leakage as claimed in claim 7 or a computer readable storage medium storing a computer program as claimed in claim 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210032046.6A CN116464691A (en) | 2022-01-12 | 2022-01-12 | Monitoring method, system, equipment and medium suitable for hydraulic oil leakage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210032046.6A CN116464691A (en) | 2022-01-12 | 2022-01-12 | Monitoring method, system, equipment and medium suitable for hydraulic oil leakage |
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| CN116464691A true CN116464691A (en) | 2023-07-21 |
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| CN202210032046.6A Pending CN116464691A (en) | 2022-01-12 | 2022-01-12 | Monitoring method, system, equipment and medium suitable for hydraulic oil leakage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117889121A (en) * | 2024-03-15 | 2024-04-16 | 徐州金鼎恒立液压件有限公司 | Hydraulic cylinder auxiliary locking device |
| CN117889121B (en) * | 2024-03-15 | 2024-05-31 | 徐州金鼎恒立液压件有限公司 | Hydraulic cylinder auxiliary locking device |
-
2022
- 2022-01-12 CN CN202210032046.6A patent/CN116464691A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117889121A (en) * | 2024-03-15 | 2024-04-16 | 徐州金鼎恒立液压件有限公司 | Hydraulic cylinder auxiliary locking device |
| CN117889121B (en) * | 2024-03-15 | 2024-05-31 | 徐州金鼎恒立液压件有限公司 | Hydraulic cylinder auxiliary locking device |
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