Judgment method for oil leakage of hydraulic station based on hot continuous rolling production line

Abstract

The invention belongs to the technical field of production control, and particularly relates to a method for judging oil leakage of a hydraulic station based on a hot continuous rolling production line, which is characterized by comprising the following specific operation steps: acquiring characteristic parameters influencing the oil quantity of an oil tank of the hydraulic station; characteristic parameters of the hydraulic station oil tank temperature are obtained; calculating the fluctuation range f (ki) of the liquid level of the hydraulic station oil tank in the period based on the characteristic parameters of the oil mass of the hydraulic station oil tank; calculating a hydraulic station oil tank temperature fluctuation range T in the period based on the characteristic parameters of the hydraulic station oil tank temperature; calculating the oil tank liquid level periodic change rate based on the fluctuation range of the hydraulic station oil tank liquid level, and evaluating the hydraulic oil quantity periodic change rate; and based on the temperature fluctuation range of the hydraulic station oil tank, evaluating the liquid level change of the hydraulic station oil tank under the condition that the oil temperature meets the requirement, and outputting an alarm according to an evaluation result. The method has the advantages that the problem that oil leakage monitoring of an existing hydraulic station lags behind is solved, parameters of the hydraulic station can be monitored in real time, and the effect of online evaluation is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of production control, and in particular relates to a method for determining oil leakage of a hydraulic station of a hot rolling production line. Background Art

[0002] The development of metal pressure processing technology has placed increasingly higher requirements on the quality standards of plate and strip products, and the development of technology depends on the development of steel rolling equipment. The working status and parameters of steel rolling equipment will directly affect the quality and production efficiency of strip products. Therefore, the study of online monitoring and fault diagnosis technology of steel rolling equipment plays a vital role in improving the core competitiveness of steel enterprises. The Chinese invention patent with application number 202311143545.3 discloses an online hydraulic oil centralized purification and oil supply method, including the following steps: pipeline connection: connecting five hydraulic stations with a central pump station; normal oil storage: during normal production, the spare oil is pumped from the oil barrel into a clean oil storage tank; oil replenishment operation: quickly transport the spare oil to the hydraulic station tank; oil replacement and centralized purification: the hydraulic oil that exceeds the standard is pumped to a waste hydraulic oil storage tank in the central pump station, and the waste oil is filtered at the pump station. This solution can reduce the leakage of oil along the line. At present, the production site mainly relies on manual inspection, and the hydraulic station is inspected and observed according to shifts. Oil leakage is difficult to be discovered in time, and it is impossible to make real-time and accurate prompts on the oil leakage status of the hydraulic station of the production line, which affects the safe and stable operation of production. Summary of the invention

[0003] The purpose of the present invention is to provide a method for determining oil leakage in a hydraulic station of a hot rolling production line, to overcome the shortcomings of the prior art, to automatically collect key oil level signals and oil tank temperatures of the hydraulic station through a production management system, and to evaluate changes in the oil tank level of the hydraulic station based on the oil temperature fluctuation of the hydraulic station when the oil temperature meets the requirements, and to output an alarm based on the evaluation result, so that the oil leakage of the hydraulic station can be discovered in time to ensure smooth production.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A method for determining oil leakage in a hydraulic station of a hot rolling production line, the specific operation steps are as follows:

[0006] 1) Obtain characteristic parameters that affect the oil volume in the hydraulic station tank; obtain characteristic parameters of the hydraulic station tank temperature;

[0007] 2) Based on the characteristic parameters of the hydraulic station tank oil volume, the fluctuation range f(k) of the hydraulic station tank oil level within the calculation cycle is calculated. i ); Calculate the temperature fluctuation range T of the hydraulic station tank within the period based on the characteristic parameters of the hydraulic station tank temperature;

[0008] 3) Calculate the periodic change rate of the oil tank level based on the fluctuation range of the oil tank level of the hydraulic station, and evaluate the periodic change rate of the hydraulic oil volume;

[0009] 4) Based on the temperature fluctuation range of the hydraulic station oil tank, the change of the hydraulic station oil tank liquid level is evaluated when the oil temperature meets the requirements, and an alarm is output according to the evaluation results.

[0010] The characteristic parameters of the oil volume in the hydraulic station tank include: the hydraulic station tank liquid level k, the hydraulic station tank first high liquid level value kmax 1 , The second highest level of the hydraulic station tank level kmax 2 , Hydraulic station tank liquid level first low level value kmin 1 , Hydraulic station tank liquid level second lowest level value kmin 2 .

[0011] The characteristic parameters of the hydraulic station oil tank temperature are: hydraulic station oil tank temperature t, hydraulic station oil tank temperature upper limit t b , Hydraulic station oil tank temperature lower limit t a .

[0012] The calculation formula for the fluctuation range of the hydraulic station tank level is: i is the extreme value of liquid level fluctuation in the i-th minute,

[0013] k i =(max i ,min i ),max i ∈[l 1 ,l 2 ,l 3 ,l 4 ,…],min i ∈[l 1 ,l 2 ,l 3 ,l 4 ,…]

[0014] max=MAX{max 1 ,max 2 ,…,max i ,…}

[0015] min=MIN{min 1 ,min 2 ,…,min j ,…}

[0016] Then, k = (max, min).

[0017] The calculation formula for the temperature fluctuation range of the hydraulic station oil tank is: i is the extreme value of temperature fluctuation in the i-th minute,

[0018] t i =(tmax i ,tmin i ),tmax i ∈[t 1 ,t 2 ,t 3 ,t 4 ,…],tmin i ∈(t 1 ,t 2 ,t 3 ,t 4 ,…]

[0019] tmax=MAX{tmax 1 ,tmax 2 ,…,tmax i ,…}

[0020] tmin=MIN{tmin 1 ,tmin 2 ,…,tmin j ,…}

[0021] Then, t = (tmax, tmin).

[0022] The formula for calculating the temperature fluctuation range T in the oil tank is:

[0023]

[0024] t a The lower limit of the hydraulic station tank temperature;

[0025] t b It is the upper limit of the hydraulic station oil tank temperature.

[0026] The hydraulic station tank level fluctuation range f(k i ) is calculated as:

[0027]

[0028] When T is 0, the hydraulic station oil tank temperature is normal; when T is 1, the hydraulic station oil tank temperature is abnormal; under normal conditions, the oil tank level fluctuation is calculated, and under abnormal conditions, an abnormal oil temperature alarm is output.

[0029] When f(k i ) is 0, the hydraulic station oil tank temperature is normal; f(k i ) is 1, the oil tank temperature of the hydraulic station is abnormal; under normal conditions, the oil tank level fluctuation is calculated, and under abnormal conditions, an oil leakage alarm is output.

[0030] The minimum setting of the cycle is one minute, and the initial setting of the cycle is one month.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1) The production management system automatically collects key oil level signals and oil tank temperatures of the hydraulic station. Based on the oil temperature fluctuation of the hydraulic station, the oil tank level change of the hydraulic station is effectively identified and evaluated when the oil temperature meets the requirements. The alarm is output based on the evaluation results, so that the oil leakage of the hydraulic station of the hot rolling production line can be discovered in time to ensure smooth production.

[0033] 2) The determination method has high accuracy and reliable operation. A monitoring experiment was carried out on a hot strip steel production line. 20 groups of hydraulic station action data of the finishing servo hydraulic station were collected in real time. The monitoring results of the hydraulic station were displayed in real time on the HMI using the determination method provided by the present invention. The determination results were basically consistent with the actual situation on site.

[0034] 3) The present invention solves the problem of lagging monitoring of oil leakage in existing hydraulic stations, and can monitor the parameters of hydraulic stations in real time, and conduct online analysis of the status of hydraulic stations by using methods such as normal distribution, clustering algorithm, and decision tree. The traditional oil leakage monitoring of hydraulic stations only focuses on the tank liquid level, and the safety threshold range is set to achieve real-time dynamic evaluation of various parts of the hydraulic station, avoiding errors caused by the asynchronous operation of various devices in the system that lead to monitoring failure, and achieving the effect of online evaluation of oil leakage in hydraulic stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0038] The components of the embodiments of the present invention that are typically described and shown in detail in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0039] See Figure 1 , which is a schematic flow diagram of an embodiment of a method for determining oil leakage in a hydraulic station based on a hot continuous rolling production line. Taking a 2250mm hot continuous rolling strip steel production line as an example, monitoring experiments were carried out. 20 groups of hydraulic station action data of the finishing servo hydraulic station were collected in real time, and the monitoring results of the hydraulic station were displayed on the HMI in real time using the monitoring method provided in this embodiment. The determination results are basically consistent with the actual situation on site. The specific operation steps are as follows:

[0040] 1) Obtain the characteristic parameters affecting the oil volume in the hydraulic station tank; obtain the characteristic parameters of the temperature of the hydraulic station tank; the characteristic parameters of the oil volume in the hydraulic station tank include: the liquid level k of the hydraulic station tank, the first high liquid level value kmax of the hydraulic station tank 1 , the second high liquid level value kmax of the hydraulic station tank 2 , the first low liquid level value kmin of the hydraulic station tank 1 , the second low liquid level value kmin of the hydraulic station tank 2 . The characteristic parameter of the temperature of the hydraulic station tank is: the temperature t of the hydraulic station tank, the upper limit t of the temperature of the hydraulic station tank b , the lower limit t of the temperature of the hydraulic station tank a .

[0041] 2) Calculate the fluctuation range f(k i ) of the liquid level in the hydraulic station tank within a cycle based on the characteristic parameters of the oil volume in the hydraulic station tank. The calculation is shown in Table 1; calculate the fluctuation range T of the temperature in the hydraulic station tank within a cycle based on the characteristic parameters of the temperature of the hydraulic station tank. The calculation is shown in Table 2;

[0042] The calculation formula for the fluctuation range of the liquid level in the hydraulic station tank is: k i is the extreme value of the liquid level fluctuation within the i-th minute, and we get

[0043] k i =(max i , min i ), max i ∈[l 1 , l 2 , l 3 , l 4 ,…], min i ∈[l 1 , l 2 , l 3 , l 4 ,…]

[0044] max=MAX{max 1 ,max 2 ,…,max i ,…}

[0045] min=MIN{min 1 ,min 2 ,…,min j ,…}

[0046] Then, k = (max, min).

[0047] The calculation formula for the temperature fluctuation range of the hydraulic station oil tank is: t i is the extreme value of temperature fluctuation in the i-th minute,

[0048] t i =(tmax i ,tmin i ),tmax i ∈[t 1 ,t 2 ,t 3 ,t 4 ,…],tmin i ∈[t 1 ,t 2 ,t 3 ,t 4 ,…]

[0049] tmax=MAX{tmax 1 ,tmax 2 ,…,tmax i ,…}

[0050] tmin=MIN{tmin 1 ,tmin 2 ,…,tmin j ,…}

[0051] Then, t = (tmax, tmin).

[0052] 3) Based on the fluctuation range of the hydraulic station tank level, the periodic change rate of the tank level is calculated to evaluate the periodic change rate of the hydraulic oil volume; the embodiment of the present invention calculates whether the temperature fluctuation in the tank is within the required range, including:

[0053]

[0054] t a The lower limit of the hydraulic station tank temperature;

[0055] t b It is the upper limit of the hydraulic station oil tank temperature;

[0056] 4) Based on the temperature fluctuation range of the hydraulic station oil tank, the change of the hydraulic station oil tank liquid level is evaluated when the oil temperature meets the requirements, and an alarm is output according to the evaluation results.

[0057] When T is 0, the hydraulic station oil tank temperature is normal, and when it is 1, the hydraulic station oil tank temperature is abnormal. Under normal conditions, the oil tank level fluctuation is calculated, and under abnormal conditions, an abnormal oil temperature alarm is output; according to the data in Table 2, the oil tank temperature is normal within this group of data range.

[0058] The embodiment of the present invention evaluates the fluctuation of the oil tank level of the hydraulic station. Within the calculation period, there are

[0059]

[0060] When f(k i ) is 0, the hydraulic station oil tank temperature is normal, and when it is 1, the hydraulic station oil tank temperature is abnormal. Under normal conditions, the oil tank level fluctuation is calculated, and under abnormal conditions, an oil leakage alarm is output;

[0061] As can be seen from Table 1, the upper and lower limits of the liquid level fluctuation are 478.27mm and 468.85mm respectively. When the real-time liquid level exceeds this range, an oil leakage alarm is output.

[0062] Table 1 Calculation of liquid level fluctuations

[0063] time Fuel tank level k kmax kmin 2023-07-1415:00:36.000 469.83 478.27 468.85 2023-07-1415:00:55.000 469.5 478.27 468.85 2023-07-1415:02:30.000 469.83 478.27 468.85 2023-07-1415:02:32.000 469.5 478.27 468.85 2023-07-1415:02:49.000 469.17 478.27 468.85 2023-07-1415:02:53.000 469.5 478.27 468.85 2023-07-1415:08:46.000 469.17 478.27 468.85 2023-07-1415:09:04.000 469.17 478.27 468.85 2023-07-1415:11:27.000 469.17 478.27 468.85 2023-07-1415:13:32.000 468.85 478.27 468.85 2023-07-1415:15:43.000 477.3 478.27 468.85 2023-07-1415:15:58.000 469.5 478.27 468.85 2023-07-1415:18:19.000 469.17 478.27 468.85 2023-07-1415:20:31.000 477.63 478.27 468.85 2023-07-1415:22:51.000 468.85 478.27 468.85 2023-07-1415:24:43.000 477.63 478.27 468.85 2023-07-1415:27:03.000 477.95 478.27 468.85 2023-07-1415:29:01.000 478.27 478.27 468.85 2023-07-1415:31:47.000 477.3 478.27 468.85 2023-07-1415:33:58.000 477.3 478.27 468.85

[0064] Table 2 Calculation of temperature fluctuations

[0065]

[0066]

[0067] The calculation period range of the embodiment of the present invention is specifically formulated according to the on-site conditions and can be initially formulated as 1 month.

[0068] In summary, the monitoring method of this embodiment overcomes the problem of lagging in the existing hydraulic station oil leakage monitoring. The present invention can monitor the hydraulic station parameters in real time online. On the basis of the traditional hydraulic station oil leakage monitoring which only focuses on the oil tank liquid level, the temperature parameter is creatively introduced to set the safety threshold range, so as to realize the real-time dynamic evaluation of the hydraulic station and achieve the effect of online evaluation of hydraulic station oil leakage. It is not only of great significance to the dynamic research of the hydraulic station, but also of reference significance to the online fault diagnosis of the equipment.

[0069] In addition, it should be noted that the present invention can be provided as a method, an apparatus or a computer program product. Therefore, the embodiments of the present invention can take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code.

[0070] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0071] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device, so that a series of operation steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable terminal device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for determining oil leakage in a hydraulic station of a hot rolling production line, characterized in that: The specific steps are as follows: 1) Obtain characteristic parameters that affect the oil volume in the hydraulic station tank; obtain characteristic parameters of the hydraulic station tank temperature; 2) Based on the characteristic parameters of the hydraulic station tank oil volume, the fluctuation range f(k) of the hydraulic station tank oil level within the calculation cycle is calculated. i ); Calculate the temperature fluctuation range T of the hydraulic station tank within the period based on the characteristic parameters of the hydraulic station tank temperature; 3) Calculate the periodic change rate of the oil tank level based on the fluctuation range of the oil tank level of the hydraulic station, and evaluate the periodic change rate of the hydraulic oil volume; 4) Based on the temperature fluctuation range of the hydraulic station oil tank, the change of the hydraulic station oil tank liquid level is evaluated when the oil temperature meets the requirements, and an alarm is output according to the evaluation results.

2. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1 is characterized in that: The characteristic parameters of the hydraulic station tank oil level include: hydraulic station tank liquid level k, hydraulic station tank first high liquid level value kmax1, hydraulic station tank second high liquid level value kmax2, hydraulic station tank first low liquid level value kmin1, hydraulic station tank second low liquid level value kmin2.

3. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1 is characterized in that: The characteristic parameters of the hydraulic station oil tank temperature are: hydraulic station oil tank temperature t, hydraulic station oil tank temperature upper limit t b , Hydraulic station oil tank temperature lower limit t a .

4. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1 is characterized in that: The calculation formula for the fluctuation range of the hydraulic station tank level is: i is the extreme value of liquid level fluctuation in the i-th minute, <h2 style=";text-align:left;direction:ltr">k<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> (max)<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> min<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> ),max<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> ∈[l1,l2,l3,l4,…],min<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> ∈[l1,l2,l3,l4,…] max=MAX{max1,max2,…,max i ,…} min=MIN{min1,min2,…,min j ,…} Then, k = (max, min).

5. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1 is characterized in that: The calculation formula for the temperature fluctuation range of the hydraulic station oil tank is: i is the extreme value of temperature fluctuation in the i-th minute, <h2 style=";text-align:left;direction:ltr">t<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> (tmax)<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> ,tmin<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> ),tmax<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> ∈[t1,t2,t3,t4,…],tmin<h2 style=";text-align:left;direction:ltr"> i <h2 style=";text-align:left;direction:ltr"> ∈[t1,t2,t3,t4,…] tmax=MAX{tmax1,tmax2,…,tmax i ,…} tmin=MIN{tmin1,tmin2,…,tmin j ,…} Then, t = (tmax, tmin).

6. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1 is characterized in that: The formula for calculating the temperature fluctuation range T in the oil tank is: t a The lower limit of the hydraulic station tank temperature; t b It is the upper limit of the hydraulic station oil tank temperature.

7. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1 is characterized in that: The hydraulic station tank level fluctuation range f(k i ) is calculated as:

8. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1 is characterized in that: When T is 0, the hydraulic station oil tank temperature is normal; when T is 1, the hydraulic station oil tank temperature is abnormal; under normal conditions, the oil tank level fluctuation is calculated, and under abnormal conditions, an abnormal oil temperature alarm is output.

9. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1, characterized in that: When f(k i ) is 0, the hydraulic station oil tank temperature is normal; f(k i ) is 1, the oil tank temperature of the hydraulic station is abnormal; under normal conditions, the oil tank level fluctuation is calculated, and under abnormal conditions, an oil leakage alarm is output.

10. The method for determining oil leakage in a hydraulic station of a hot rolling production line according to claim 1, characterized in that: The minimum setting of the cycle is one minute, and the initial setting of the cycle is one month.

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