Valve opening degree control method, device, controller and paper machine

Abstract

This application provides a valve opening control method, apparatus, controller, and paper machine. The method includes: acquiring a target pressure value of the paper machine and the allowable valve opening of the paper machine's PID controller at each detection time; determining the recommended valve opening corresponding to one of the target pressure values ​​from the fitted curves as the fitted valve opening based on the correspondence between each expected pressure value and each recommended valve opening; and obtaining the recommended valve opening of the paper machine at each detection time based on the fitted valve opening and the allowable valve opening of the PID controller. Therefore, by combining the expected pressure value of the paper machine and the allowable valve opening output by the PID controller to determine the recommended valve opening of the paper machine, this application can improve the stability of the linear pressure control of the paper machine and adapt to the manufacturing needs of different paper thicknesses and different process stages.

Description

Technical Field

[0001] This application relates to the field of mechanical control technology, and in particular to a valve opening control method, device, electronic equipment, storage medium, computer program product, controller, and paper machine. Background Technology

[0002] The press unit is a major component of the paper machine. Among them, the shoe press process has been widely used in high-speed paper machines because it can improve the defects of traditional pressing processes, such as small linear pressure zone and low dewatering efficiency.

[0003] refer to Figure 1 The shoe pressing mechanism 102 of the paper machine can be composed of a first pressure roller 104 and a second pressure roller 106. The first pressure roller 104 and the second pressure roller 106 are located on opposite sides of the paper to be processed 110, and apply pressure to the paper to be processed 110 under the control of a control system (e.g., a hydraulic system) to perform dewatering, pressing, and other processing on the paper to be processed 110. In the papermaking process, the pressure applied to the paper to be processed 110 by the coordinated action of the first pressure roller 104 and the second pressure roller 106 is referred to as "shoe pressing."

[0004] In related technologies, the valve opening of an electric valve is controlled based on the output value of a PID controller (proportional-integral-derivative controller), and the shoe pressure mechanism (e.g., based on the valve opening) is driven. Figure 1 The first pressure roller 104 and the second pressure roller 106 perform an actuation to apply corresponding pressure (shoe pressure) to the paper 110 to be processed. The main problem with this control scheme is that the linear pressure control of the shoe pressure is poor and it cannot meet the manufacturing requirements of different paper thicknesses and different process stages. Summary of the Invention

[0005] In view of this, this application provides a valve opening control scheme that can improve the pressure control stability of the paper machine and the pressure control adaptability to different paper thicknesses or different manufacturing processes.

[0006] According to a first aspect of the present application, a valve opening control method is provided, applied to a paper machine. The method includes: acquiring a target pressure value of the paper machine and an allowable valve opening corresponding to each detection time of the PID controller of the paper machine, wherein the target pressure value represents the target pressure applied by the paper machine to the paper to be processed; determining the recommended valve opening corresponding to one of the target pressure values ​​from the expected pressure values ​​in the fitted curve as the fitted valve opening based on the correspondence between each expected pressure value and each recommended valve opening; and obtaining the recommended valve opening of the paper machine corresponding to each detection time based on the fitted valve opening and the allowable valve opening corresponding to each detection time of the PID controller (318).

[0007] In some embodiments, the allowable valve opening of the paper machine at each detection time can be obtained by the PID controller based on the actual pressure value of the paper machine at each detection time.

[0008] In some embodiments, each desired pressure value of the paper machine can be determined; multiple actual valve openings of the paper machine corresponding to each desired pressure value can be collected to obtain a recommended valve opening for each desired pressure value; curve fitting can be performed based on the correspondence between each desired pressure value and each recommended valve opening to obtain the fitted curve.

[0009] In some embodiments, for any current pressure value among the desired pressure values, multiple actual pressure values ​​applied to the paper to be processed by the paper machine and the actual valve opening of the paper machine corresponding to each actual pressure value can be continuously collected within a preset sampling period. If the difference between each actual pressure value and the current pressure value is not greater than a preset deviation threshold, the recommended valve opening for the current pressure value is determined based on the average value of each actual valve opening.

[0010] In some embodiments, the preset sampling period is 1 minute; the preset deviation threshold is 1%.

[0011] In some embodiments, the fitted curve can be updated by: determining any desired pressure value in the fitted curve as the pressure value to be updated, and determining the recommended valve opening for the pressure value to be updated; collecting multiple actual valve openings of the paper machine (300) corresponding to the pressure value to be updated, and obtaining the valve opening to be updated for the pressure value to be updated; calculating the difference between the recommended valve opening and the valve opening to be updated for the pressure value to be updated; if the difference is not greater than the allowable update threshold, determining the valve opening to be updated as the new recommended valve opening for the pressure value to be updated, and updating the fitted curve based on the pressure value to be updated and the new recommended valve opening.

[0012] In some embodiments, the allowed update threshold is 10%.

[0013] In some embodiments, the permissible valve opening degree includes the valve adjustment range, and the recommended valve opening degree includes a recommended valve opening range value.

[0014] In some embodiments, based on the fitted valve opening of the paper machine and the valve adjustment amplitude of the PID controller at each detection time, the upper limit and lower limit values ​​of the valve opening of the paper machine at each detection time are determined; based on the upper limit and lower limit values ​​of the valve opening of the paper machine at each detection time, the recommended valve opening range value of the paper machine at each detection time is obtained.

[0015] In some embodiments, the valve adjustment range is not greater than +15% and not less than -15%.

[0016] According to a second aspect of the embodiments of this application, a valve opening control device is provided, applied to a paper machine, comprising: an acquisition module, configured to acquire a target pressure value of the paper machine and an allowable valve opening corresponding to each detection time of the PID controller of the paper machine, wherein the target pressure value characterizes the target pressure applied by the paper machine to the paper to be processed; an analysis module, configured to determine the recommended valve opening corresponding to one of the target pressure values ​​among the expected pressure values ​​as the fitted valve opening based on the correspondence between each expected pressure value and each recommended valve opening in the fitted curve; and a calculation module, configured to obtain the recommended valve opening of the paper machine corresponding to each detection time based on the fitted valve opening and the allowable valve opening corresponding to each detection time of the PID controller.

[0017] According to a third aspect of the embodiments of this application, a controller is provided, the controller being communicatively connected to a paper machine, the controller storing control instructions, which, when executed, cause the controller to perform the method described in the first aspect.

[0018] According to a fourth aspect of the present application, a paper machine is provided, comprising: a shoe pressing mechanism for applying shoe pressure to paper to be processed; a controller as described in the first aspect; and a drive device, the drive device being communicatively connected to the controller and the shoe pressing mechanism respectively, for driving the shoe pressing mechanism to perform corresponding actions according to the control instructions of the controller.

[0019] According to a fifth aspect of the present application, an electronic device is provided, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus; the memory is used to store at least one executable instruction, wherein the executable instruction causes the processor to perform an operation corresponding to the method described in the first aspect.

[0020] According to a sixth aspect of the embodiments of this application, a computer-readable storage medium is provided, wherein computer instructions are stored on the computer-readable storage medium, and when executed by a processor, the computer instructions cause the processor to perform the method as described in the first aspect.

[0021] According to a seventh aspect of the embodiments of this application, a computer program product is provided, including computer instructions that instruct a computing device to perform an operation corresponding to the method described in the first aspect.

[0022] The valve opening control schemes provided in the embodiments of this application are based on the desired pressure value of the paper machine and use the allowable valve opening output by the PID controller as auxiliary control to determine the target valve opening of the paper machine. This can improve the stability of the pressure control of the paper machine and can adapt to the manufacturing needs of different paper thicknesses and different process stages.

[0023] The valve opening control schemes provided in the embodiments of this application dynamically adjust the allowable valve opening of the paper machine based on the real-time pressure feedback value of the paper machine using a PID controller. This allows the schemes to better adapt to various complex manufacturing conditions and improve the stability of the paper machine's pressure control.

[0024] The valve opening control schemes provided in the embodiments of this application use fitting curves that characterize the correspondence between each desired pressure value and each recommended valve opening to perform valve opening estimation control. This can effectively avoid pressure control inaccuracy caused by pressure sensing failure and ensure that mechanical equipment is not damaged due to excessively large or small PID output values.

[0025] The valve opening control schemes provided in the embodiments of this application can determine the recommended valve opening for the desired pressure value based on the average value of the actual valve openings corresponding to each actual pressure value when it is determined that multiple continuously collected actual pressure values ​​are within the preset deviation range of the desired pressure value, thereby improving the accuracy of the curve fitting results.

[0026] The valve opening control schemes provided in the embodiments of this application can dynamically optimize the fitting curve according to the pressure control requirements of different process stages of the papermaking machine, so as to flexibly meet the manufacturing needs of different process stages. In addition, by limiting the deviation between the unupdated value and the updated value of the fitting curve, the misjudgment of the fitting curve optimization caused by equipment failure can be effectively prevented.

[0027] The valve opening control schemes provided in the embodiments of this application dynamically determine the valve adjustment range of the paper machine based on the allowable valve opening output in real time by the PID controller. This determines the recommended valve opening range for the paper machine corresponding to different process stages, which not only improves the pressure control stability of the paper machine but also flexibly meets the pressure control requirements of different process stages, thereby improving production quality. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the shoe pressing mechanism of a paper machine.

[0029] Figure 2 This is a flowchart of a valve opening control method that is an exemplary embodiment of this application.

[0030] Figure 3 for Figure 2 The diagram shows the data processing logic of the valve opening control method.

[0031] Figure 4 A flowchart of a valve opening control method as another exemplary embodiment of this application.

[0032] Figure 5 This is a schematic diagram of a valve opening control device as an exemplary embodiment of this application.

[0033] Figure 6 This is a schematic diagram of a papermaking machine as an exemplary embodiment of this application.

[0034] Figure 7 This is a schematic diagram of an electronic device that is an exemplary embodiment of this application.

[0035] List of reference numerals in the attached diagram:

[0036] 200. Valve opening control method

[0037] 202. Obtain the target pressure value of the paper machine and the allowable valve opening degree of the paper machine's PID controller at each detection moment.

[0038] 204. Based on the correspondence between each desired pressure value and each recommended valve opening in the fitted curve, the recommended valve opening corresponding to one desired pressure value among the recommended valve openings is determined as the fitted valve opening.

[0039] 206. Based on the fitted valve opening and the allowable valve opening of the PID controller at each detection time, the recommended valve opening of the paper machine at each detection time is obtained.

[0040] 400. Methods for updating fitted curves

[0041] 402. Determine any desired pressure value from the fitted curve as the pressure value to be updated, and determine the recommended valve opening for the pressure value to be updated.

[0042] 404. Collect the actual valve openings of multiple valves on the paper machine corresponding to the pressure value to be updated, and obtain the valve openings to be updated for the pressure value to be updated.

[0043] 406. Determine whether the difference between the recommended valve opening and the valve opening to be updated for the pressure value to be updated is greater than the allowable update threshold. If not, proceed to step 408; if yes, proceed to step 410.

[0044] 408. Based on the valve opening to be updated, obtain a new recommended valve opening for the pressure value to be updated, and update the fitted curve based on the pressure value to be updated and the new recommended valve opening.

[0045] 410. End processing flow

[0046] 102. Shoe Pressing Mechanism

[0047] 104. First pressure roller

[0048] 106. Second pressure roller

[0049] 110. Paper to be processed

[0050] 300. Paper machine

[0051] 302. Target pressure value

[0052] 304. Permissible valve opening degree

[0053] 306. Recommended valve opening

[0054] 308. Electrically controlled valves

[0055] 310. Shoe pressing mechanism; 312. Paper to be processed.

[0056] 314. Pressure sensor

[0057] 316. Actual pressure value

[0058] 318. PID controller

[0059] 500. Valve opening control device

[0060] 502. Acquisition Module

[0061] 504, Analysis Module

[0062] 506. Calculation Module

[0063] 600, Paper machine; 602, Shoe pressing mechanism

[0064] 604, Controller

[0065] 606. Drive unit

[0066] 700. Electronic equipment

[0067] 702, Processor

[0068] 704. Communication Interface

[0069] 706. Memory

[0070] 708, Bus

[0071] 710. Procedure Detailed Implementation

[0072] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0073] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Where there is no conflict between the embodiments, the following embodiments and features can be combined with each other. The steps in the following method embodiments are for illustrative purposes only and are not intended to limit the invention.

[0074] The press rolls of a paper machine are the main components of the press unit. Among them, the shoe press process can improve the technical defects of traditional press processes, such as small linear pressure zone and low dewatering efficiency, and has been widely used in current high-speed paper machines.

[0075] In traditional papermaking processes, paper machines typically determine the valve opening of an electric valve (not shown) based solely on the output value of a PID controller (not shown), and then drive the shoe pressing mechanism 102 to apply corresponding shoe pressure to the paper 110 to perform dewatering and leveling processes. This method has the following main technical drawbacks:

[0076] First, when the parameters of the PID controller are not set properly, the PID climb rate is slow, resulting in a long start-up time for the paper machine and a large amount of paper loss.

[0077] Secondly, because the paper to be processed has uneven thickness during the production process, the PID control scheme with the same parameters has poor pressure control stability, which affects the manufacturing quality of the paper.

[0078] Furthermore, when hardware devices related to the control process (such as proximity switches) malfunction, the pressure feedback value output by the pressure sensor will be locked. This means that the output value of the PID controller will not change with the pressure feedback value, resulting in pressure control failure of the shoe pressure mechanism. It is also easy to cause equipment damage due to abnormal PID output values ​​(too large or too small).

[0079] Based on the various problems mentioned above that are only based on the existing technology, the embodiments of this application provide a valve opening control scheme that can improve the stability of pressure control and meet the manufacturing needs of paper of different thicknesses and different process stages.

[0080] The specific implementation of each embodiment of this application will be described in detail below with reference to the accompanying drawings.

[0081] Valve opening control method

[0082] Figure 2 A flowchart of a valve opening control method 200 according to an exemplary embodiment of this application is shown. This method can be applied to a paper machine, allowing the paper machine to control the first pressure roller 104 and the second pressure roller 106 of the shoe pressing mechanism 102 to cooperate in applying corresponding pressure to the paper 110 to be processed, based on the recommended valve opening determined by the method 200 of this embodiment. This performs dewatering and / or pressing processes on the paper 110. The following will combine... Figure 3 The data processing logic shown is described in detail, along with the specific implementation process of this embodiment.

[0083] As shown in the figure, the method 200 of this embodiment mainly includes the following steps:

[0084] Step 202: Obtain the target pressure value of the paper machine and the allowable valve opening degree of the paper machine's PID controller at each detection moment.

[0085] refer to Figure 3 The target pressure value 302 of the paper machine 300 represents the target pressure applied by the paper machine 300 to the paper 312 to be processed.

[0086] In some embodiments, the target pressure value 302 of the paper machine 300 may be determined based on the actual paper thickness of the paper to be processed and the process manufacturing requirements (e.g., paper dryness requirements, paper flatness requirements, etc.).

[0087] For example, the target pressure value 302 can be set to either a fixed value or a dynamic value within a preset manufacturing period, which is not limited in this application.

[0088] In some embodiments, reference Figure 3The allowable valve opening 304 of the paper machine 300 at each detection moment can be obtained by the PID controller 318 based on the actual pressure value 316 of the paper machine 300 at each detection moment.

[0089] For example, the pressure sensor 314 can repeatedly detect the pressure applied to the paper 312 by the shoe pressing mechanism 310 according to a preset detection interval (wherein, the structural design of the shoe pressing mechanism 310 can be referred to...). Figure 1 (As shown in the embodiment), the actual pressure value 316 of the shoe pressure mechanism 310 of the paper machine 300 corresponding to each detection moment is obtained, and the allowable valve opening degree 304 of the electronically controlled valve 308 of the paper machine 300 corresponding to each detection moment is estimated by the PID controller 318 based on the actual pressure value of the shoe pressure mechanism 310 corresponding to each detection moment.

[0090] In some embodiments, the permissible valve opening 304 output by the PID controller 318 includes the valve adjustment range.

[0091] In some embodiments, the valve adjustment range may be determined based on the equipment performance of the paper machine 300 (e.g., valve performance, roller performance, etc.).

[0092] In some embodiments, the valve adjustment range output by the PID controller 318 is no greater than +15% and no less than -15% (i.e., the valve adjustment range is between ±15%). Preferably, the valve adjustment range output by the PID controller 318 is no greater than +10% and no less than -10% (i.e., the valve adjustment range is between ±10%).

[0093] Step 204: Based on the correspondence between each expected pressure value and each recommended valve opening in the fitted curve, determine the recommended valve opening that corresponds to one expected pressure value of the target pressure value as the fitted valve opening.

[0094] refer to Figure 3 The fitted curve is used to characterize the correspondence between the desired pressure value applied by the shoe pressure mechanism 310 of the paper machine 300 to the paper to be processed 312 and the recommended valve opening of the electronically controlled valve 308 of the paper machine 300.

[0095] In some embodiments, the shoe pressure mechanism 310 may determine each desired pressure value applied to the paper 312 to be processed, and collect multiple actual valve openings of the electronically controlled valve 308 corresponding to each desired pressure value to obtain a recommended valve opening for each desired pressure value. Curve fitting is then performed based on the correspondence between each desired pressure value and each recommended valve opening to obtain a fitted curve.

[0096] In some embodiments, for any current pressure value among the desired pressure values, multiple actual pressure values ​​applied to the paper 312 by the shoe pressing mechanism 310 of the paper machine 300 can be continuously collected within a preset sampling period, and the actual valve opening of the electrically controlled valve 308 of the paper machine 300 corresponding to each actual pressure value can be collected. Wherein, if the difference between each actual pressure value collected within the preset sampling period and the current pressure value is not greater than a preset deviation threshold, then an average calculation is performed based on each actual valve opening collected within the preset sampling period to determine the recommended valve opening for the current pressure value.

[0097] In some embodiments, the preset sampling period can be set to 1 minute and the preset deviation threshold can be set to 1%.

[0098] Specifically, within a 1-minute sampling period, the pressure sensor 314 continuously collects multiple actual pressure values ​​316 applied by the shoe pressing mechanism 310 to the paper to be processed 312, and collects the actual valve opening of the electronically controlled valve 308 corresponding to each actual pressure value 316. If the deviation between each collected actual pressure value 316 and the current pressure value (expected pressure value) falls within the range of -1% to +1% (i.e., the pressure fluctuation range applied by the shoe pressing mechanism 310 is within ±1% of the current pressure value), it indicates that the pressure applied by the shoe pressing mechanism 310 to the paper to be processed 312 remains stable within the preset sampling period. In this case, the average value can be calculated based on each actual valve opening collected within the sampling period to obtain the recommended valve opening of the electronically controlled valve 308 corresponding to the current pressure value (expected pressure value).

[0099] It should be noted that the preset sampling period and preset deviation threshold are not limited to the above examples, and those skilled in the art can adjust them arbitrarily according to conditions such as pressure control accuracy and paper manufacturing requirements.

[0100] Step 206: Based on the fitted valve opening and the allowable valve opening of the PID controller at each detection time, obtain the recommended valve opening of the paper machine at each detection time.

[0101] In some embodiments, the recommended valve opening may include a recommended valve opening range value.

[0102] refer to Figure 3 Based on the fitted valve opening of the paper machine 300 and the valve adjustment amplitude of the PID controller 318 at each detection time, the upper limit and lower limit of the valve opening of the paper machine 300 at each detection time can be determined. Based on the upper limit and lower limit of the valve opening of the paper machine 300 at each detection time, the recommended valve opening range of the paper machine 300 at each detection time can be obtained.

[0103] For example, when the valve adjustment range is no greater than +15% and no less than -15%, the recommended valve opening range for the paper machine 300 at each detection time is [A-15%, A+15%], where A represents the fitted valve opening.

[0104] For example, when the valve adjustment range is no greater than +10% and no less than -10%, the recommended valve opening range for the paper machine 300 at each detection time is [A-10%, A+10%], where A represents the fitted valve opening.

[0105] The valve opening control scheme provided in this embodiment uses the fitted valve opening determined by the fitted curve based on the target pressure value as the basic control, and the allowable valve opening output in real time by the PID controller as the auxiliary control to dynamically determine the recommended valve opening of the paper machine, thereby narrowing the output range of the recommended valve opening (specifically, it can be narrowed from the "±100%" output range of the prior art to the output range of "fitted valve opening ± allowable valve opening"). This avoids the problem of pressure control inaccuracy when the pressure sensor fails, which not only improves the pressure control stability of the paper machine, but also ensures that the mechanical equipment will not be damaged due to abnormal PID output values.

[0106] The valve opening control scheme provided in this embodiment can dynamically adjust the allowable valve opening of the paper machine by the PID controller based on the real-time pressure feedback value of the paper machine, and can adapt to the pressure control requirements of paper of different thicknesses.

[0107] The valve opening control scheme provided in this embodiment can calculate the recommended valve opening for the desired pressure value based on the actual valve opening corresponding to each actual pressure when multiple actual pressure values ​​of the paper machine are continuously measured to be close to the desired pressure value. This improves the accuracy of the fitting curve and helps to improve the accuracy of equipment pressure control.

[0108] The valve opening control scheme provided in this embodiment dynamically determines the recommended valve opening range value of the paper machine based on the allowable valve opening output in real time by the PID controller, thereby flexibly meeting the pressure control requirements of different process stages and improving production quality.

[0109] Figure 4 This is a flowchart of a valve opening control method according to another embodiment of this application. Since the papermaking process determines that the parameters of the paper machine may differ at different stages of the process, it is not suitable to define the correspondence between each desired pressure value and each recommended valve opening using constants.

[0110] In view of this, this embodiment provides a method for updating the fitted curve to meet the pressure control requirements of different process stages. The processing flow of this embodiment can be compared with... Figure 2The processing flow can be executed synchronously or independently. Figure 2 The processing flow is executed separately.

[0111] like Figure 4 As shown, the method 400 in this embodiment mainly includes the following steps:

[0112] Step 402: Determine any desired pressure value from the fitted curve as the pressure value to be updated, and determine the recommended valve opening for the pressure value to be updated.

[0113] In some embodiments, it may be possible to execute Figure 2 In the process of the scheme shown, the expected pressure value obtained in step 202 is determined as the pressure value to be updated for the fitted curve, and the recommended valve opening of the expected pressure value obtained in step 204 is determined as the recommended valve opening of the pressure value to be updated.

[0114] In some embodiments, a pressure value to be updated can be determined from the desired pressure values ​​of the fitted curve by manual input, and the recommended valve opening corresponding to the pressure value to be updated can be obtained from the fitted curve.

[0115] Step 404: Collect the actual valve openings of multiple valves on the paper machine corresponding to the pressure value to be updated, and obtain the valve openings to be updated for the pressure value to be updated.

[0116] In some embodiments, multiple actual pressure values ​​applied to the paper to be processed by the paper machine and the actual valve opening of the paper machine corresponding to each actual pressure value can be continuously collected within a preset sampling period. If the difference between each actual pressure value and the pressure value to be updated falls within a preset deviation threshold, the valve opening to be updated for the pressure value to be updated is determined based on the average value of each actual valve opening.

[0117] For example, refer to Figure 3 Within a 1-minute sampling period, the pressure sensor 314 continuously collects multiple actual pressure values ​​316 applied by the shoe pressure mechanism 310 to the paper to be processed 312, and collects the actual valve opening of the electronically controlled valve 308 corresponding to each actual pressure value 316. If the difference between each actual pressure value 316 and the pressure value to be updated is not greater than a preset deviation threshold (e.g., a preset deviation threshold of 1%), the average value can be calculated based on the actual valve opening of the electronically controlled valve 308 corresponding to each actual pressure value 316 to obtain the valve opening of the pressure value to be updated.

[0118] Step 406: Determine whether the difference between the recommended valve opening and the valve opening to be updated for the pressure value to be updated is greater than the allowable update threshold. If not, proceed to step 408; if yes, proceed to step 410.

[0119] In some embodiments, the allowable update threshold can be set to 10%.

[0120] For example, the difference between the recommended valve opening (original value) and the valve opening (new value) to be updated can be calculated. If the difference between the two is less than or equal to 10% (i.e., the valve opening to be updated falls within the range of ±10% of the recommended valve opening), step 408 is executed.

[0121] Step 408: Based on the valve opening to be updated, obtain the new recommended valve opening for the pressure value to be updated, and update the fitted curve based on the pressure value to be updated and the new recommended valve opening.

[0122] In other words, the recommended valve opening for the pressure value to be updated can be replaced with the valve opening to be updated, and the fitting curve can be updated based on the pressure value to be updated and the updated recommended valve opening, so that the updated fitting curve can meet the pressure control requirements of the current process stage.

[0123] Step 410: End the processing flow.

[0124] The valve opening control scheme provided in this embodiment can dynamically optimize the fitting curve according to different manufacturing stages of the paper machine, so that the pressure control of the paper machine can adapt to different manufacturing needs.

[0125] The valve opening control scheme provided in this embodiment can effectively prevent misjudgment of the fitting curve due to equipment failure by limiting the deviation range between the unupdated value (recommended valve opening) and the updated value (valve opening to be updated) of the fitted curve, thereby improving the accuracy of the curve fitting results.

[0126] Valve opening control device

[0127] Figure 5 This diagram illustrates the structure of a valve opening control device 500 according to an exemplary embodiment of this application. The valve opening control device 500 of this embodiment can be applied to a paper machine 300, and the device 500 includes:

[0128] The acquisition module 502 is used to acquire the target pressure value of the paper machine 300 and the allowable valve opening degree of the PID controller 318 of the paper machine 300 corresponding to each detection time. The target pressure value represents the pressure applied by the paper machine to the paper to be processed.

[0129] Analysis module 504 is used to determine the recommended valve opening of one of the expected pressure values ​​corresponding to the target pressure value from the expected pressure values ​​in the fitted curve as the fitted valve opening, based on the correspondence between each expected pressure value and each recommended valve opening.

[0130] The calculation module 506 is used to obtain the recommended valve opening of the paper machine 300 for each detection time based on the fitted valve opening and the allowable valve opening of the PID controller 318 for each detection time.

[0131] In some embodiments, the allowable valve opening of the paper machine 300 at each detection time can be obtained by the PID controller 318 based on the actual pressure value of the paper machine 300 at each detection time.

[0132] In some embodiments, the valve opening fitting device 500 further includes a curve fitting module (not shown) for determining each desired pressure value of the paper machine 300, collecting multiple actual valve openings of the paper machine 300 corresponding to each desired pressure value, obtaining a recommended valve opening for each desired pressure value, and performing curve fitting based on the correspondence between each desired pressure value and each recommended valve opening to obtain a fitting curve.

[0133] In some embodiments, the curve fitting module is further configured to: for any current pressure value among the desired pressure values; continuously collect multiple actual pressure values ​​applied by the paper machine 300 to the paper to be processed and the actual valve opening of the paper machine 300 corresponding to each actual pressure value within a preset sampling period; if the difference between each actual pressure value and the current pressure value is not greater than a preset deviation threshold, determine the recommended valve opening for the current pressure value based on the average value of each actual valve opening.

[0134] In some embodiments, the preset sampling period is 1 minute; the preset deviation threshold is 1%.

[0135] In some embodiments, the curve fitting module is further configured to: determine any desired pressure value in the fitted curve as the pressure value to be updated, and determine the recommended valve opening for the pressure value to be updated; collect multiple actual valve openings of the paper machine 300 corresponding to the pressure value to be updated, and obtain the valve opening to be updated for the pressure value to be updated; calculate the difference between the recommended valve opening for the pressure value to be updated and the valve opening to be updated; if the difference is not greater than the allowable update threshold, determine the valve opening to be updated as the new recommended valve opening for the pressure value to be updated, and update the fitted curve based on the pressure value to be updated and the new recommended valve opening.

[0136] In some embodiments, the update threshold is allowed to be 10%.

[0137] In some embodiments, the calculation module 506 is further configured to: determine the upper limit and lower limit of the valve opening of the paper machine 300 for each detection time based on the fitted valve opening of the paper machine 300 and the valve adjustment amplitude of the PID controller 318 for each detection time; and obtain the recommended valve opening range value of the paper machine 300 for each detection time based on the upper limit and lower limit of the valve opening of the paper machine 300 for each detection time.

[0138] In some embodiments, the valve adjustment range is not greater than +15% and not less than -15%.

[0139] controller

[0140] An exemplary embodiment of this application also provides a controller that is communicatively connected to a paper machine 300. The controller stores control instructions, and when the control instructions are executed, the controller performs the steps described in the above-described embodiments of the valve opening control methods.

[0141] In some embodiments, the controller includes, but is not limited to, a PLC controller, a microcontroller, etc.

[0142] Paper machine

[0143] An exemplary embodiment of this application also provides a paper machine 600, including: a shoe pressing mechanism 602, a controller 604 as described in the foregoing embodiments, and a drive device 606.

[0144] The shoe pressing mechanism 602 is used to apply pressure to the paper to be processed. For detailed structural design of the shoe pressing mechanism 602, please refer to... Figure 1 The shoe pressing structure 102 shown; the drive device 606 is communicatively connected to the controller 604 and the shoe pressing mechanism 602 respectively, and is used to drive the shoe pressing mechanism 602 to perform corresponding actions according to the control instructions of the controller 604, so as to adjust the pressure applied to the paper to be processed.

[0145] In some embodiments, the drive unit may include a frequency converter and a servo motor.

[0146] electronic devices

[0147] Figure 7 This is a schematic diagram of an electronic device provided in an embodiment of this application. The specific embodiments of this application do not limit the specific implementation of the electronic device. See also... Figure 7 The electronic device 700 provided in this application embodiment includes: a processor 702, a communications interface 704, a memory 706, and a bus 708. Wherein:

[0148] The processor 702, communication interface 704, and memory 706 communicate with each other via bus 708.

[0149] Communication interface 704 is used to communicate with other electronic devices or servers.

[0150] The processor 702 is used to execute program 710, which can specifically execute the relevant steps in the above-described valve opening control method embodiment.

[0151] Specifically, program 710 may include program code that includes computer operation instructions.

[0152] The processor 702 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application. The smart device includes one or more processors, which may be processors of the same type, such as one or more CPUs; or they may be processors of different types, such as one or more CPUs and one or more ASICs.

[0153] Memory 706 is used to store program 710. Memory 706 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0154] Specifically, program 710 can be used to cause processor 702 to execute the valve opening control method in any of the foregoing embodiments.

[0155] The specific implementation of each step in program 710 can be found in the corresponding steps and units described in the above-mentioned valve opening control method embodiments, and will not be repeated here. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described equipment and modules can be referred to the corresponding process descriptions in the aforementioned method embodiments, and will not be repeated here.

[0156] Computer-readable storage media

[0157] This application also provides a computer-readable storage medium storing instructions for causing a machine to perform the valve opening control method as described herein. Specifically, a system or apparatus equipped with a storage medium storing software program code that implements the functions of any of the embodiments described above, and enabling the computer (or CPU or MPU) of the system or apparatus to read and execute the program code stored in the storage medium.

[0158] In this case, the program code read from the storage medium can itself implement the function of any of the above embodiments, and therefore the program code and the storage medium storing the program code constitute part of this application.

[0159] Storage media embodiments for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, program code can be downloaded from a server computer via a communication network.

[0160] Computer program products

[0161] This application also provides a computer program product, including computer instructions that instruct a computing device to perform any corresponding operation in the above-described plurality of method embodiments.

[0162] It should be noted that, depending on the implementation needs, the various components / steps described in the embodiments of this application can be broken down into more components / steps, or two or more components / steps or parts of the operation of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of this application.

[0163] The methods described in the embodiments of this application can be implemented in hardware, firmware, or as software or computer code that can be stored in a recording medium (such as a CD-ROM, RAM, floppy disk, hard disk, or magneto-optical disk), or as computer code downloaded over a network that is originally stored in a remote recording medium or a non-transitory machine-readable medium and will be stored in a local recording medium. Thus, the methods described herein can be processed by software stored on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an ASIC or FPGA). It is understood that the computer, processor, microprocessor controller, or programmable hardware includes storage components (e.g., RAM, ROM, flash memory, etc.) capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods described herein. Furthermore, when a general-purpose computer accesses code used to implement the methods shown herein, the execution of the code transforms the general-purpose computer into a dedicated computer for executing the methods shown herein.

[0164] It should be noted that not all steps and modules in the above processes and system structure diagrams are mandatory; some steps or modules can be omitted as needed. The execution order of each step is not fixed and can be adjusted as required. The system structure described in the above embodiments can be a physical structure or a logical structure. That is, some modules may be implemented by the same physical entity, or some modules may be implemented by multiple physical entities, or they may be jointly implemented by certain components in multiple independent devices.

[0165] In this patent application, nouns and pronouns relating to people are not limited to specific genders.

[0166] In the above embodiments, the hardware modules can be implemented mechanically or electrically. For example, a hardware module may include permanent, dedicated circuitry or logic (such as a dedicated processor, FPGA, or ASIC) to perform the corresponding operations. The hardware module may also include programmable logic or circuitry (such as a general-purpose processor or other programmable processor), which can be temporarily configured by software to perform the corresponding operations. The specific implementation method (mechanical, dedicated, permanent circuitry, or temporarily configured circuitry) can be determined based on cost and time considerations.

[0167] The present invention has been shown and described in detail above with reference to the accompanying drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Based on the above multiple embodiments, those skilled in the art will know that more embodiments of the present invention can be obtained by combining the code review methods in the different embodiments above. These embodiments are also within the protection scope of the present invention.

Claims

1. A valve opening control method (200), applied to a papermaking machine (300), the method comprising: The target pressure value of the paper machine (300) and the allowable valve opening of the PID controller (318) of the paper machine (300) corresponding to each detection time are obtained, wherein the target pressure value represents the pressure applied by the paper machine to the target paper to be processed; Based on the correspondence between each expected pressure value and each recommended valve opening in the fitted curve, the recommended valve opening corresponding to one of the expected pressure values ​​of the target pressure value is determined as the fitted valve opening. Based on the fitted valve opening and the allowable valve opening of the PID controller (318) at each detection time, the recommended valve opening of the paper machine (300) at each detection time is obtained. The fitted curve is obtained in the following way: Determine each desired pressure value for the paper machine (300); Collect the actual valve openings of the paper machine (300) corresponding to each desired pressure value to obtain the recommended valve opening for each desired pressure value; Based on the correspondence between each desired pressure value and each recommended valve opening, curve fitting is performed to obtain the fitted curve. The process of collecting the actual valve openings of the paper machine (300) corresponding to each desired pressure value, and obtaining the recommended valve opening for each desired pressure value, includes: For any current pressure value among the expected pressure values; During a preset sampling period, multiple actual pressure values ​​applied to the paper to be processed by the paper machine (300) and the actual valve opening of the paper machine (300) corresponding to each actual pressure value are continuously collected. If the difference between each actual pressure value and the current pressure value is not greater than a preset deviation threshold, the recommended valve opening for the current pressure value is determined based on the average value of each actual valve opening.

2. The method according to claim 1, wherein, The permissible valve opening at each detection moment is obtained by the PID controller (318) of the paper machine (300) for each detection moment in the following manner: The PID controller (318) obtains the allowable valve opening of the paper machine (300) for each detection time based on the actual pressure value of the paper machine (300) for each detection time.

3. The method according to claim 1, wherein, The preset sampling period is 1 minute; The preset deviation threshold is 1%.

4. The method according to claim 1, wherein, Update the fitted curve (400) as follows: Any desired pressure value in the fitted curve is determined as the pressure value to be updated, and the recommended valve opening for the pressure value to be updated is determined. Collect the actual valve openings of the paper machine (300) corresponding to the pressure value to be updated, and obtain the valve openings to be updated for the pressure value to be updated; Calculate the difference between the recommended valve opening and the valve opening to be updated for the pressure value to be updated. If the difference is not greater than the allowable update threshold, determine the valve opening to be updated as the new recommended valve opening for the pressure value to be updated, and update the fitted curve based on the pressure value to be updated and the new recommended valve opening. The allowed update threshold is 10%.

5. The method according to claim 1, wherein, The permissible valve opening degree includes the valve adjustment range, and the recommended valve opening degree includes a recommended valve opening range value; Furthermore, the step of obtaining the recommended valve opening of the paper machine (300) for each detection time based on the fitted valve opening and the allowable valve opening of the PID controller (318) for each detection time includes: Based on the fitted valve opening of the paper machine (300) and the valve adjustment amplitude of the PID controller (318) at each detection time, the upper limit value and lower limit value of the valve opening of the paper machine (300) at each detection time are determined. Based on the upper limit and lower limit of the valve opening of the paper machine (300) at each detection time, the recommended valve opening range value of the paper machine (300) at each detection time is obtained.

6. The method according to claim 5, wherein, The valve adjustment range shall not exceed +15% and shall not be less than -15%.

7. A valve opening control device (500), applied to a papermaking machine (300), comprising: The acquisition module (502) is used to acquire the target pressure value of the paper machine (300) and the allowable valve opening of the PID controller (318) of the paper machine (300) at each detection time, wherein the target pressure value represents the pressure applied by the paper machine to the target paper to be processed; Analysis module (504) is used to determine the recommended valve opening of one of the expected pressure values ​​corresponding to the target pressure value as the fitted valve opening based on the correspondence between each expected pressure value and each recommended valve opening in the fitted curve. The calculation module (506) is used to obtain the recommended valve opening of the paper machine (300) for each detection time based on the fitted valve opening and the allowable valve opening of the PID controller (318) for each detection time. The fitted curve is obtained in the following way: Determine each desired pressure value for the paper machine (300); Collect the actual valve openings of the paper machine (300) corresponding to each desired pressure value to obtain the recommended valve opening for each desired pressure value; Based on the correspondence between each desired pressure value and each recommended valve opening, curve fitting is performed to obtain the fitted curve. The process of collecting the actual valve openings of the paper machine (300) corresponding to each desired pressure value, and obtaining the recommended valve opening for each desired pressure value, includes: For any current pressure value among the expected pressure values; During a preset sampling period, multiple actual pressure values ​​applied to the paper to be processed by the paper machine (300) and the actual valve opening of the paper machine (300) corresponding to each actual pressure value are continuously collected. If the difference between each actual pressure value and the current pressure value is not greater than a preset deviation threshold, the recommended valve opening for the current pressure value is determined based on the average value of each actual valve opening.

8. A controller communicatively connected to a paper machine (300), the controller storing control instructions that, when executed, cause the controller to perform the method as described in any one of claims 1 to 6.

9. A papermaking machine, comprising: The shoe press mechanism is used to apply pressure to the paper being processed. The controller as described in claim 8; A drive device is communicatively connected to the controller and the shoe pressing mechanism, and is used to drive the shoe pressing mechanism to perform corresponding actions according to the control instructions of the controller.

10. An electronic device (700), comprising: The processor (702), the communication interface (704), the memory (706), and the communication bus (708) communicate with each other through the communication bus (708). The memory (706) is used to store at least one executable instruction that causes the processor (702) to perform an operation corresponding to the method as described in any one of claims 1 to 6.

11. A computer-readable storage medium storing computer instructions that, when executed by a processor, cause the processor to perform the method as described in any one of claims 1 to 6.

12. A computer program product comprising computer instructions that instruct a computing device to perform an operation corresponding to the method of any one of claims 1 to 6.

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