Valve automatic control method and system for chemical production

Abstract

The present invention relates to the field of data processing technology, and specifically to a valve automatic control method and system for chemical production, including: obtaining a hydraulic cylinder image and the pressure and temperature of a rodless chamber of the hydraulic cylinder at each moment; obtaining the extension hydraulic oil demand of the piston rod of each hydraulic cylinder at the current moment and the hydraulic oil demand of the rodless chamber, and obtaining the initial hydraulic oil demand of each hydraulic cylinder at the next moment; obtaining the liquid separation index of each hydraulic cylinder at the current moment, using the liquid separation index of the hydraulic cylinder at the current moment to adjust the initial hydraulic oil demand, and obtaining the liquid separation amount of each hydraulic cylinder at the next moment; obtaining the liquid separation ratio of each hydraulic cylinder at the next moment according to the liquid separation amount of each hydraulic cylinder at the next moment, and realizing adaptive control of the automatic valve for the diverter valve control. The present invention aims to change the automatic valve of the hydraulic gate system to be able to perform adaptive adjustment according to actual conditions during operation, thereby improving the efficiency of collaborative work.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a valve automatic control method and system for chemical production. Background Art

[0002] Large hydraulic gate systems play an important role in the chemical industry, usually involving multiple hydraulic cylinders as the main control elements. Their synchronous operation is crucial to the efficiency of the system. The performance of the hydraulic cylinder is directly affected by the amount of internal oil. Therefore, it is necessary to ensure that each hydraulic cylinder can obtain equal or proportional oil flow to coordinate its operation. The current solution includes using diverter valves to distribute oil and adjust the flow of each actuator to ensure that they can work synchronously. However, in actual operation, the state of the oil inside the hydraulic cylinder changes dynamically and is affected by factors such as temperature and pressure. These factors will cause energy loss of the oil. The current challenge is that the set diversion ratio is static and cannot be adaptively adjusted according to the actual operation conditions, which may reduce the efficiency of the system's collaborative work. Therefore, in the application scenarios of the chemical industry, a more intelligent and adaptive control method is needed to overcome the challenges brought by the change of oil state and ensure that the hydraulic system can still operate efficiently under dynamic conditions, thereby improving the overall performance and reliability of the system. Summary of the invention

[0003] The present invention provides a valve automatic control method and system for chemical production to solve the existing problems.

[0004] The valve automatic control method and system for chemical production of the present invention adopts the following technical solutions:

[0005] An embodiment of the present invention provides a valve automatic control method for chemical production, the method comprising the following steps:

[0006] Acquire the hydraulic cylinder image and the pressure and temperature of the rodless chamber of the hydraulic cylinder at each moment;

[0007] According to the extended length of the piston rod and the length of the hydraulic cylinder barrel, the required amount of hydraulic oil for the extended piston rod of each hydraulic cylinder at the current moment is obtained;

[0008] According to the pressure difference between the hydraulic cylinder and the rodless chamber of other hydraulic cylinders, the hydraulic oil demand of the rodless chamber of each hydraulic cylinder at the current moment is obtained;

[0009] According to the extension hydraulic oil demand of the piston rod of each hydraulic cylinder at the current moment and the hydraulic oil demand of the rodless chamber, the initial hydraulic oil demand of each hydraulic cylinder at the next moment is obtained;

[0010] According to the pressure and temperature changes of the rodless chamber of the hydraulic cylinder at the current moment and the historical moment, the liquid separation index of each hydraulic cylinder at the current moment is obtained;

[0011] The initial hydraulic oil demand is adjusted using the liquid dispensing index of the hydraulic cylinder at the current moment, and the liquid dispensing amount of each hydraulic cylinder at the next moment is obtained;

[0012] The liquid distribution ratio of each hydraulic cylinder at the next moment is obtained according to the liquid distribution amount of each hydraulic cylinder at the next moment, and the adaptive control of the automatic valve is realized for the diverter valve control.

[0013] Furthermore, the hydraulic oil demand for extending the piston rod of each hydraulic cylinder at the current moment includes:

[0014] The formula for calculating the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment is:

[0015]

[0016] Among them, f i,j represents the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment; l i,j represents the extension ratio of the piston rod of the i-th hydraulic cylinder at the j-th moment, wherein the extension ratio is obtained by taking the ratio of the number of pixels of the piston rod of each hydraulic cylinder at each moment to the number of pixels of the hydraulic cylinder barrel as the extension ratio of the piston rod of each hydraulic cylinder at each moment; represents the mean extension ratio of the piston rods of all hydraulic cylinders at the jth moment; ε represents a hyperparameter; L represents the length of the hydraulic cylinder barrel.

[0017] Further, the number of pixels of the piston rod extending out and the number of pixels of the hydraulic cylinder barrel include:

[0018] The image of each hydraulic cylinder at each moment is input into the DNN semantic segmentation network segmentation, and the segmentation neural network is used to segment the hydraulic cylinder image to obtain the number of pixels of the piston rod extended and the number of pixels of the hydraulic cylinder barrel of each hydraulic cylinder at each moment.

[0019] Furthermore, the hydraulic oil demand of the rodless chamber of each hydraulic cylinder at the current moment includes:

[0020] The calculation formula for the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment is:

[0021]

[0022] Among them, f i,j ′ represents the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; P i,j represents the pressure of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; It represents the mean pressure of the rodless chamber of all hydraulic cylinders at the jth moment; exp() represents an exponential function with a natural constant as the base.

[0023] Furthermore, the initial hydraulic oil demand of each hydraulic cylinder at the next moment includes:

[0024] The sum of the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment and the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment is recorded as the initial hydraulic oil demand of the i-th hydraulic cylinder at the j+1-th moment.

[0025] Furthermore, the liquid separation index of each hydraulic cylinder at the current moment includes:

[0026] The neighborhood is preset to obtain the neighborhood time, and the pressure of the i-th hydraulic cylinder at the j-th moment and the average of all pressures at the j-th moment's neighborhood moments are recorded as the pressure evaluation of the i-th hydraulic cylinder at the j-th moment; the temperature of the i-th hydraulic cylinder at the j-th moment and the average of all temperatures at the j-th moment's neighborhood moments are recorded as the temperature evaluation of the i-th hydraulic cylinder at the j-th moment;

[0027] The liquid separation index of the i-th hydraulic cylinder at the j-th moment is obtained according to the temperature evaluation and the pressure evaluation of the i-th hydraulic cylinder at the j-th moment.

[0028] Furthermore, the specific method of obtaining the liquid separation index is:

[0029] The calculation formula of the liquid separation index of the i-th hydraulic cylinder at the j-th moment is:

[0030] Z i,j =exp[|A i,j -(P i,1 -P i,j )|+|B i,j -(T i,1 -T i,j )|]

[0031] Among them, Z i,j A represents the liquid separation index of the i-th hydraulic cylinder at the j-th moment; i,j represents the pressure evaluation of the i-th hydraulic cylinder at the j-th moment; B i,j represents the temperature evaluation of the i-th hydraulic cylinder at the j-th moment; P i,1 P represents the pressure of the rodless chamber when the i-th hydraulic cylinder starts to close the door; i,j represents the pressure of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; T i,1 represents the temperature at the time when the i-th hydraulic cylinder starts to close; T i,jrepresents the temperature of the i-th hydraulic cylinder at the j-th moment; || represents the absolute value function; exp( ) represents the exponential function with a natural constant as the base.

[0032] Furthermore, the liquid distribution amount of each hydraulic cylinder at the next moment includes:

[0033] The product of the initial hydraulic oil demand of the i-th hydraulic cylinder at the j+1th moment and the liquid distribution index of the i-th hydraulic cylinder at the jth moment is recorded as the liquid distribution volume of the i-th hydraulic cylinder at the j+1th moment.

[0034] Furthermore, the liquid distribution ratio of each hydraulic cylinder at the next moment includes:

[0035] The ratio of the liquid distribution amount of the i-th hydraulic cylinder at the j+1th moment to the liquid distribution amount of all hydraulic cylinders is recorded as the liquid distribution ratio of the i-th hydraulic cylinder at the j+1th moment.

[0036] The present invention also proposes a valve automatic control system for chemical production, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of the aforementioned valve automatic control method for chemical production.

[0037] The beneficial effects of the technical solution of the invention are: obtaining the hydraulic cylinder image and the pressure and temperature of the rodless chamber of the hydraulic cylinder at each moment, and obtaining the hydraulic oil demand for the extension of the piston rod of each hydraulic cylinder at the current moment according to the extended length of the piston rod and the length of the hydraulic cylinder barrel. The extended length of the piston rod directly affects the usage of the hydraulic oil. By calculating the piston rod position of the cylinder, the hydraulic oil demand currently required for each cylinder can be accurately calculated; according to the pressure difference between the rodless chamber of the hydraulic cylinder and other hydraulic cylinders, the hydraulic oil demand for the rodless chamber of each hydraulic cylinder at the current moment is obtained. The rodless chamber pressure difference reflects the pressure distribution between different cylinders in the system. By calculating the oil demand for the rodless chamber of the cylinder in this way, the hydraulic oil can be distributed more effectively; according to the hydraulic oil demand for the extension of the piston rod of each hydraulic cylinder at the current moment and the hydraulic oil demand for the rodless chamber, the initial hydraulic oil demand for each hydraulic cylinder at the next moment is obtained, based on Based on the current piston rod extension and rodless chamber pressure requirements, the cylinder oil demand in the next time step is predicted, which helps to adjust the system control strategy to meet the demand changes in the future time period; according to the pressure and temperature changes of the rodless chamber of the hydraulic cylinder at the current moment and the historical moment, the liquid separation index of each hydraulic cylinder at the current moment is obtained to more accurately evaluate the current working status and health status of each cylinder, so as to adjust the oil demand; the initial hydraulic oil demand is adjusted using the liquid separation index of the hydraulic cylinder at the current moment, and the liquid separation amount of each hydraulic cylinder at the next moment is obtained, ensuring the balanced distribution of oil among the cylinders; according to the liquid separation amount of each hydraulic cylinder at the next moment, the liquid separation ratio of each hydraulic cylinder at the next moment is obtained, and the adaptive control of the automatic valve is realized for the diverter valve control, so that the automatic valve of the hydraulic gate system can be adaptively adjusted according to the actual situation during operation, thereby improving the efficiency of collaborative work. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 The present invention is a flow chart of the steps of the valve automatic control method for chemical production. DETAILED DESCRIPTION

[0040] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the valve automatic control method and system for chemical production proposed by the present invention, its specific implementation method, structure, characteristics and effects are described in detail as follows in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0041] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0042] The specific scheme of the valve automatic control method and system for chemical production provided by the present invention is described in detail below with reference to the accompanying drawings.

[0043] See also Figure 1 , which shows a flow chart of the steps of a valve automatic control method for chemical production provided by an embodiment of the present invention, the method comprising the following steps:

[0044] Step S001, acquiring the hydraulic cylinder image and the pressure and temperature of the rodless chamber of the hydraulic cylinder at each moment.

[0045] The purpose of this embodiment is to realize adaptive control of the automatic valve according to the hydraulic cylinder image of the valve and the oil chamber pressure inside the hydraulic cylinder, so it is necessary to collect the image of the hydraulic cylinder when opening and closing the valve and the monitoring data of the hydraulic cylinder. Specifically, firstly, a camera is installed on the side surface of the hydraulic cylinder where the change of the hydraulic cylinder can be observed, and the camera is used to capture the image of the hydraulic cylinder every 1 second as a moment, and obtain several images of the hydraulic cylinder from the time when the hydraulic cylinder closes the valve to the time when the hydraulic cylinder opens the valve.

[0046] Furthermore, the interior of the hydraulic cylinder includes two oil chambers, a rod chamber and a rodless chamber. A high-pressure explosion-proof liquid pressure sensor and a temperature sensor are installed in the rodless chamber of the hydraulic cylinder. Starting from the same time when the hydraulic cylinder image is collected, the pressure and temperature at each moment are collected respectively, and the pressure and temperature of the rodless chamber of the hydraulic cylinder at all times from the time when the hydraulic cylinder closes the valve to the time when the valve is opened are obtained.

[0047] Step S002: Obtain the hydraulic oil demand for the extension of the piston rod of each hydraulic cylinder at the current moment based on the extended length of the piston rod and the length of the hydraulic cylinder barrel; obtain the hydraulic oil demand for the rodless chamber of each hydraulic cylinder at the current moment based on the pressure difference between the hydraulic cylinder and the rodless chamber of other hydraulic cylinders; obtain the initial hydraulic oil demand for each hydraulic cylinder at the next moment based on the hydraulic oil demand for the extension of the piston rod of each hydraulic cylinder and the hydraulic oil demand of the rodless chamber at the current moment.

[0048] It should be noted that when closing the door, the piston rod of the hydraulic cylinder moves outward and the extended length is relatively long, so the load carried may be small, so the required amount of hydraulic oil is also correspondingly small; on the contrary, when opening the door, the piston rod moves into the hydraulic cylinder barrel and the extended length is short, indicating that the load received is small, so the required amount of hydraulic oil is also small. The process of opening the door is opposite to that of closing the door. The process of closing the door, that is, the hydraulic demand when the piston rod extends outward, is analyzed. Therefore, this embodiment obtains the hydraulic oil demand when the piston rod extends outward according to the difference in the length of the piston rod of each hydraulic cylinder and other hydraulic cylinders.

[0049] Specifically, in this embodiment, the image of each hydraulic cylinder at each moment is input into the segmentation neural network segmentation, and the segmentation neural network is used to segment the hydraulic cylinder image, and the number of pixels of the piston rod extended and the number of pixels of the hydraulic cylinder barrel of each hydraulic cylinder at each moment are obtained respectively. The segmentation neural network used in this embodiment is a DNN semantic segmentation network, and the data set for training the DNN semantic segmentation network is a hydraulic cylinder image data set, wherein the DNN semantic segmentation network is a well-known technology, and the specific method is not introduced here. The specific method for obtaining the hydraulic cylinder image data set is: obtaining a large number of images of hydraulic cylinders at each moment, dividing the pixels to be segmented into three categories for manual labeling, marking the pixels belonging to the piston rod area as 0, the pixels belonging to the hydraulic cylinder barrel area as 1, and the pixels in other background areas as 2, and all the hydraulic cylinder images composed of all the labeled pixels constitute the hydraulic cylinder image data set. The DNN semantic segmentation network is trained using the hydraulic cylinder image data set obtained above, and the loss function used in the training process is the cross entropy loss function. The specific training process is well-known, and this embodiment will not be described in detail.

[0050] Furthermore, the ratio of the number of pixels of the piston rod of each hydraulic cylinder at each moment to the number of pixels of the hydraulic cylinder barrel is recorded as the extension ratio of the piston rod of each hydraulic cylinder at each moment. When the extension ratio of the piston rod is 0, it means that the piston rod is completely in the hydraulic cylinder barrel, and the gate is completely closed at this time; when the extension ratio of the piston rod is closer to 1, it means that the extended length of the piston rod is longer.

[0051] The calculation formula for the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment is:

[0052]

[0053] Among them, f i,j represents the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment; l i,j represents the extension ratio of the piston rod of the i-th hydraulic cylinder at the j-th moment; represents the mean extension ratio of the piston rods of all hydraulic cylinders at the jth moment; ε represents a hyperparameter used to avoid the denominator being 0; L represents the length of the hydraulic cylinder barrel.

[0054] It represents the ratio between the hydraulic oil demand and the average extension ratio. The larger the value is, the greater the deviation of the hydraulic oil demand at the jth moment when the piston rod of the i-th hydraulic cylinder extends outward from the average value. The ratio of the hydraulic oil demand when the piston rod is extended outwards shows the effect of the piston rod position on the hydraulic oil demand. It represents the difference between the extension ratio of the piston rod of the i-th hydraulic cylinder at the j-th moment and the average extension ratio of the piston rods of all hydraulic cylinders at the j-th moment. The larger the value is, the greater the degree to which the position of the piston rod of the hydraulic cylinder relative to other hydraulic cylinders at that moment deviates from the average. Indicates the degree of influence of the piston rod position on the hydraulic oil demand. The larger the value, the more significant the influence of the piston rod position of the hydraulic cylinder on the hydraulic oil demand.

[0055] When the extension ratio of the piston rod of the i-th hydraulic cylinder at the j-th moment is greater than the average extension ratio of the piston rods of all hydraulic cylinders at the j-th moment, it means that the longer the extended length of the piston rod is, the less oil is required; when the extension ratio of the piston rod of the i-th hydraulic cylinder at the j-th moment is less than the average extension ratio of the piston rods of all hydraulic cylinders at the j-th moment, it means that the shorter the extended length of the piston rod is, the more oil is required.

[0056] It should be noted that when estimating the load, the magnitude of the load on the hydraulic cylinder is reflected by the pressure collected by the internal oil sensor. According to Pascal's law, when the static fluid part inside a closed container undergoes a pressure change, the pressure will be evenly transmitted in all directions. Therefore, during the door closing process, the pressure in the rodless chamber gradually increases, allowing the hydraulic cylinder to support a larger load. The average pressure in the rodless chamber is used as the standard pressure. At a certain moment, if the pressure of a certain hydraulic cylinder is lower than the standard pressure of other hydraulic cylinders, it indicates that the load pressure on the hydraulic cylinder is smaller. In order to maintain synchronization, more oil needs to be allocated to the hydraulic cylinder in this case.

[0057] The calculation formula for the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment is:

[0058]

[0059] Among them, f i,j ′ represents the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; P i,j represents the pressure of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; represents the mean pressure of the rodless chamber of all hydraulic cylinders at the jth moment; exp( ) represents an exponential function with a natural constant as the base.

[0060] It represents the relative difference between the pressure of the rodless chamber of the i-th hydraulic cylinder at the j-th moment and the average pressure of the rodless chambers of all the hydraulic cylinders at the j-th moment. The larger the value is, the greater the deviation between the pressure of the rodless chamber of the i-th hydraulic cylinder at the j-th moment and the average pressure of the rodless chambers of all the hydraulic cylinders at the j-th moment, that is, the pressure change of this hydraulic cylinder is more significant relative to the pressure change of other hydraulic cylinders.

[0061] The sum of the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment and the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment is recorded as the initial hydraulic oil demand of the i-th hydraulic cylinder at the j+1-th moment.

[0062] Step S003: Obtain the liquid separation index of each hydraulic cylinder at the current moment according to the pressure and temperature changes of the rodless chamber of the hydraulic cylinder at the current moment and at the historical moments.

[0063] It should be noted that the above steps obtain the initial hydraulic oil demand of the hydraulic cylinder based on the hydraulic cylinder image and the pressure inside the hydraulic cylinder. However, the oil demand is related to the state of the oil inside the hydraulic cylinder. The temperature and pressure of the oil will affect the final load-bearing capacity of the hydraulic cylinder. In the rodless cavity, the pressure and temperature of the oil continue to increase, which puts forward high requirements on the quality of the hydraulic cylinder and hydraulic oil. Generally, when acting as a medium, hydraulic oil not only plays the role of transmitting force, but also has protection and lubrication functions, so it has a certain viscosity. If the viscosity of the hydraulic oil is too large, the oil flow resistance increases, thereby reducing the oil flow, aggravating the friction and heating of the hydraulic components, and increasing energy loss; on the contrary, if the viscosity is too low, it is easy to cause oil leakage, but the energy loss is reduced. When the energy loss of the hydraulic oil in the hydraulic cylinder is small, only a small amount of distribution is required to ensure that the hydraulic cylinder reaches the standard working state. Therefore, when there is a faster pressure growth rate and temperature rise rate of a hydraulic cylinder, it means that the viscosity of the hydraulic cylinder oil decreases more, thereby reducing energy loss, so the amount of hydraulic oil required by the hydraulic cylinder is also smaller.

[0064] It should be further explained that when the temperature and pressure change rates of adjacent hydraulic components increase, the amount of oil required should be reduced accordingly, and the liquid separation index should be weakened. Since the viscosity of the oil decreases with the increase in the temperature and pressure change rates, the energy loss is reduced, and the amount of oil required by the hydraulic system is reduced accordingly. Therefore, this embodiment obtains the liquid separation index based on the ability of the hydraulic system to more effectively utilize the oil under high-rate temperature and pressure change conditions. The weakening of the liquid separation index reflects the ability of the hydraulic system to more effectively utilize the oil under high-rate temperature and pressure change conditions.

[0065] Specifically, the pressure and temperature of the number of neighbors at the jth moment are selected according to the preset number of neighbors n, and are recorded as the pressure and temperature of the jth moment of the neighborhood. In this embodiment, the number of neighbors is described as 3 as an example. Other implementations may set it to other values, which are not limited in this embodiment. The calculation formula of the liquid separation index of the i-th hydraulic cylinder at the jth moment is:

[0066] Z i,j =exp[|A i,j -(P i,1 -P i,j )|+|B i,j -(T i,1 -T i,j )|]

[0067] Among them, Z i,j A represents the liquid separation index of the i-th hydraulic cylinder at the j-th moment; i,j represents the pressure evaluation of the i-th hydraulic cylinder at the j-th moment, and the pressure evaluation is obtained by taking the pressure of the i-th hydraulic cylinder at the j-th moment and the average of all pressures at the j-th moment's neighboring moments as the pressure evaluation of the i-th hydraulic cylinder at the j-th moment; B i,j represents the temperature evaluation of the i-th hydraulic cylinder at the j-th moment, and the temperature evaluation is obtained by taking the average of the temperature of the i-th hydraulic cylinder at the j-th moment and all the temperatures at the neighboring moments of the j-th moment as the temperature evaluation of the i-th hydraulic cylinder at the j-th moment; P i,1 P represents the pressure of the rodless chamber when the i-th hydraulic cylinder starts to close the door; i,j represents the pressure of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; T i,1 represents the temperature at the time when the i-th hydraulic cylinder starts to close; T i,j represents the temperature of the i-th hydraulic cylinder at the j-th moment; || represents the absolute value function; exp( ) represents the exponential function with a natural constant as the base.

[0068] A i,j -(P i,1 -P i,j) represents the difference between the recent pressure change rate and the historical average change rate. The larger the value, the greater the change in the viscosity of the oil has been in the recent period of time, resulting in a reduction in energy loss, and thus a reduction in the demand for oil in the hydraulic system. Therefore, the required liquid separation index will also be reduced accordingly. B i,j -(T i,1 -T i,j ) represents the difference between the recent temperature change rate and the historical average change rate. The larger the value, the greater the temperature fluctuation of the hydraulic system in the recent period of time, and more cooling or heating measures are needed to maintain a stable working state.

[0069] Step S004: Use the liquid distribution index of the hydraulic cylinder at the current moment to adjust the initial hydraulic oil demand, and obtain the liquid distribution amount of each hydraulic cylinder at the next moment.

[0070] The initial hydraulic oil demand obtained through the hydraulic cylinder image data is mainly based on the extension relationship of the hydraulic cylinder piston and the internal pressure. The initial hydraulic oil demand cannot accurately describe the actual situation of the internal oil. Therefore, in order to more accurately understand the demand for hydraulic oil, the influence of pressure change and temperature change on oil viscosity is used to analyze the hydraulic oil separation index. The separation index reflects the influence of the actual internal situation of the hydraulic cylinder on the required hydraulic oil volume. The lower the separation index, the less oil the hydraulic cylinder requires.

[0071] The initial hydraulic oil demand of the i-th hydraulic cylinder at the j+1th time is recorded as F i,j+1 , the calculation formula for the liquid distribution volume of the i-th hydraulic cylinder at the j+1th moment is:

[0072] Q i,j+1 =F i,j+1 ×Z i,j

[0073] Among them, Q i,j+1 represents the amount of liquid dispensed by the i-th hydraulic cylinder at the j+1th moment; Z i,j Represents the liquid separation index of the i-th hydraulic cylinder at the j-th moment.

[0074] So far, the liquid distribution volume of each hydraulic cylinder at each moment is obtained according to the above method.

[0075] Step S005, obtaining the liquid distribution ratio of each hydraulic cylinder at the next moment according to the liquid distribution amount of each hydraulic cylinder at the next moment, and realizing adaptive control of the automatic valve by controlling the diverter valve.

[0076] The liquid separation valve adjusts the flow direction and flow of the hydraulic oil so that each hydraulic cylinder obtains the required hydraulic pressure and flow, thereby ensuring that the hydraulic cylinders can operate synchronously and complete the required actions. The above steps calculate the required hydraulic oil volume of each hydraulic cylinder at the next moment. The required hydraulic oil volume of all hydraulic cylinders represents the total hydraulic oil demand in the system.

[0077] The calculation formula for the liquid distribution ratio of the i-th hydraulic cylinder at the j+1th moment is:

[0078]

[0079] Among them, α i,j+1 represents the liquid distribution ratio of the i-th hydraulic cylinder at the j+1th moment; Q i,j+1 represents the liquid distribution volume of the i-th hydraulic cylinder at the j+1-th moment; x represents the number of hydraulic cylinders.

[0080] Similarly, the liquid distribution ratio of each hydraulic cylinder at the next moment is obtained.

[0081] The liquid distribution ratio of each hydraulic cylinder at the next moment is obtained according to real-time calculation. The valve control system dynamically adjusts the opening ratio of the liquid distribution valve according to the liquid distribution ratio of each hydraulic cylinder at the next moment, thereby realizing the adaptive control of the amount of hydraulic oil in the hydraulic cylinder by the diverter valve. In the chemical industry application scenario, it can ensure that the hydraulic system can still operate efficiently under dynamic conditions, thereby improving the overall performance and reliability of the system.

[0082] It should be noted that the exp(-x) model used in this embodiment only indicates that the result of the negative correlation and constraint model output is in the interval (0,1], where x is the input of this model. It can be replaced by other models with the same purpose during specific implementation. This embodiment only takes the exp(-x) model as an example for description without making any specific limitation.

[0083] This is the end of the present invention.

[0084] To sum up, in an embodiment of the present invention, the present invention also provides a valve automatic control system for chemical production, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program stored in the memory to implement the steps of the aforementioned valve automatic control method for chemical production.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve automatic control method for chemical production, characterized in that: The method comprises the following steps: Acquire the hydraulic cylinder image and the pressure and temperature of the rodless chamber of the hydraulic cylinder at each moment; According to the extended length of the piston rod and the length of the hydraulic cylinder barrel, the required amount of hydraulic oil for the extended piston rod of each hydraulic cylinder at the current moment is obtained; According to the pressure difference between the hydraulic cylinder and the rodless chamber of other hydraulic cylinders, the hydraulic oil demand of the rodless chamber of each hydraulic cylinder at the current moment is obtained; According to the extension hydraulic oil demand of the piston rod of each hydraulic cylinder at the current moment and the hydraulic oil demand of the rodless chamber, the initial hydraulic oil demand of each hydraulic cylinder at the next moment is obtained; According to the pressure and temperature changes of the rodless chamber of the hydraulic cylinder at the current moment and the historical moment, the liquid separation index of each hydraulic cylinder at the current moment is obtained; The initial hydraulic oil demand is adjusted using the liquid dispensing index of the hydraulic cylinder at the current moment, and the liquid dispensing amount of each hydraulic cylinder at the next moment is obtained; The liquid distribution ratio of each hydraulic cylinder at the next moment is obtained according to the liquid distribution amount of each hydraulic cylinder at the next moment, and the adaptive control of the automatic valve is realized for the diverter valve control.

2. The valve automatic control method for chemical production according to claim 1, characterized in that: The hydraulic oil demand for the extension of the piston rod of each hydraulic cylinder at the current moment includes: The formula for calculating the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment is: Among them, f i,j represents the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment; l i,j represents the extension ratio of the piston rod of the i-th hydraulic cylinder at the j-th moment, wherein the extension ratio is obtained by taking the ratio of the number of pixels of the piston rod of each hydraulic cylinder at each moment to the number of pixels of the hydraulic cylinder barrel as the extension ratio of the piston rod of each hydraulic cylinder at each moment; represents the mean extension ratio of the piston rods of all hydraulic cylinders at the jth moment; ε represents a hyperparameter; L represents the length of the hydraulic cylinder barrel.

3. The valve automatic control method for chemical production according to claim 2, characterized in that: The number of pixels of the piston rod extending out and the number of pixels of the hydraulic cylinder barrel include: The image of each hydraulic cylinder at each moment is input into the DNN semantic segmentation network segmentation, and the segmentation neural network is used to segment the hydraulic cylinder image to obtain the number of pixels of the piston rod extended and the number of pixels of the hydraulic cylinder barrel of each hydraulic cylinder at each moment.

4. The valve automatic control method for chemical production according to claim 1, characterized in that: The hydraulic oil demand of the rodless chamber of each hydraulic cylinder at the current moment includes: The calculation formula for the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment is: Among them, f i,j ′ represents the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; P i,j represents the pressure of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; It represents the mean pressure of the rodless chamber of all hydraulic cylinders at the jth moment; exp() represents an exponential function with a natural constant as the base.

5. The valve automatic control method for chemical production according to claim 4, characterized in that: The initial hydraulic oil demand of each hydraulic cylinder at the next moment includes: The sum of the hydraulic oil demand for the extension of the piston rod of the i-th hydraulic cylinder at the j-th moment and the hydraulic oil demand of the rodless chamber of the i-th hydraulic cylinder at the j-th moment is recorded as the initial hydraulic oil demand of the i-th hydraulic cylinder at the j+1-th moment.

6. The valve automatic control method for chemical production according to claim 1, characterized in that: The liquid separation index of each hydraulic cylinder at the current moment includes: The neighborhood is preset to obtain the neighborhood time, and the pressure of the i-th hydraulic cylinder at the j-th moment and the average of all pressures at the j-th moment's neighborhood moments are recorded as the pressure evaluation of the i-th hydraulic cylinder at the j-th moment; the temperature of the i-th hydraulic cylinder at the j-th moment and the average of all temperatures at the j-th moment's neighborhood moments are recorded as the temperature evaluation of the i-th hydraulic cylinder at the j-th moment; The liquid separation index of the i-th hydraulic cylinder at the j-th moment is obtained according to the temperature evaluation and the pressure evaluation of the i-th hydraulic cylinder at the j-th moment.

7. The valve automatic control method for chemical production according to claim 6, characterized in that: The specific method for obtaining the separation index is: The calculation formula of the liquid separation index of the i-th hydraulic cylinder at the j-th moment is: Z i,j =exp[|A i,j -(P i,1 -P i,j )|+|B i,j -(T i,1 -T i,j )|] Among them, Z i,j A represents the liquid separation index of the i-th hydraulic cylinder at the j-th moment; i,j represents the pressure evaluation of the i-th hydraulic cylinder at the j-th moment; B i,j represents the temperature evaluation of the i-th hydraulic cylinder at the j-th moment; P i,1 P represents the pressure of the rodless chamber when the i-th hydraulic cylinder starts to close the door; i,j represents the pressure of the rodless chamber of the i-th hydraulic cylinder at the j-th moment; T i,1 represents the temperature at the time when the i-th hydraulic cylinder starts to close; T i,j represents the temperature of the i-th hydraulic cylinder at the j-th moment; || represents the absolute value function; exp() represents the exponential function with a natural constant as the base.

8. The valve automatic control method for chemical production according to claim 1, characterized in that: The liquid distribution amount of each hydraulic cylinder at the next moment includes: The product of the initial hydraulic oil demand of the i-th hydraulic cylinder at the j+1th moment and the liquid distribution index of the i-th hydraulic cylinder at the jth moment is recorded as the liquid distribution volume of the i-th hydraulic cylinder at the j+1th moment.

9. The valve automatic control method for chemical production according to claim 1, characterized in that: The liquid distribution ratio of each hydraulic cylinder at the next moment includes: The ratio of the liquid distribution amount of the i-th hydraulic cylinder at the j+1th moment to the liquid distribution amount of all hydraulic cylinders is recorded as the liquid distribution ratio of the i-th hydraulic cylinder at the j+1th moment.

10. A valve automatic control system for chemical production, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the computer program is executed by a processor, the steps of the valve automatic control method for chemical production as described in any one of claims 1 to 9 are implemented.

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