Automatic protection feeding heat treatment control method, equipment and medium

Abstract

The invention discloses an automatic protection feed heat treatment control method, equipment and a medium, and relates to the technical field of heat treatment process control, and the method comprises the steps: obtaining the volume flow of cooling water, building a corresponding relation between the frequency of a circulating pump and the opening degree of a valve, and setting feed physical properties, the temperature range of a feed inlet and the boundary of the cooling water; calculating the instantaneous thermal load according to the feeding speed and the feeding physical property, converting the cooling water mass flow demand, and generating the cooling water volume flow in combination with the low-speed constraint; based on the process temperature, the cooling water volume flow is corrected according to the feeding outlet temperature deviation, cooling water boundary limitation is carried out, and the circulating pump frequency and the valve opening degree are generated; abnormality determination is performed on the feed inlet temperature, the cooling water volume flow cooling rate, and the cooling water temperature within the sampling period, and heat treatment control is performed based on the abnormality determination. According to the invention, the accurate quantification of the feeding mass flow and the capability of adjusting the cooling water amount are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment process control, and in particular to an automatic protection feeding heat treatment control method, device and medium. BACKGROUND

[0002] In continuous heat treatment production, the feeding needs to be quickly introduced into the cooling section after being discharged, and the temperature change is directly related to the material organization performance, size stability and subsequent processing adaptability. In order to realize real-time regulation and control of the temperature field, the conventional control method constructs the heat transfer relationship based on the thermal physical parameters, feeding speed and water cooling jacket temperature difference, realizes dynamic management of the cooling process, is widely used in industrial heat treatment equipment, and has good engineering applicability and clear theoretical basis.

[0003] However, when facing the continuous feeding process, the conventional method often needs to process the comprehensive influence of feeding speed fluctuation, inlet temperature disturbance and cooling water temperature change; in terms of immediate response, the correction strength of the outlet temperature deviation is usually limited by the coupling degree of the control link, so that it is difficult to maintain the stable matching of the cooling capacity when the heat load changes rapidly. In addition, since the cooling rate, inlet temperature and cooling water boundary need to meet the material resistance requirements at the same time, the protection logic of the cooling flow of the traditional control strategy is relatively single under abnormal working conditions, which easily leads to that the adjustment amplitude lags behind the actual working condition change, so that it is difficult to balance the equipment safety and the continuity of material cooling. SUMMARY

[0004] In view of the above existing problems, the present application is proposed.

[0005] Therefore, the present application provides an automatic protection feeding heat treatment control method to solve the problems of insufficient immediate matching of cooling capacity and insensitive abnormal temperature adjustment in the prior art.

[0006] To solve the above technical problems, the present application provides the following technical solutions: In a first aspect, the present application provides an automatic protection feeding heat treatment control method, which comprises: correcting the linear speed by using a driving roller to obtain the feeding speed, obtaining the inlet and outlet temperatures of the feeding and cooling water and performing linear correction and smoothing processing to generate a process temperature; obtaining the cooling water volume flow and establishing the corresponding relationship between the circulating pump frequency and the valve opening, setting the feeding physical property, the feeding inlet temperature range and the cooling water boundary; calculating the instantaneous heat load according to the feeding speed and the feeding physical property and converting the cooling water mass flow demand, combining the low-speed constraint to generate the cooling water volume flow; based on the process temperature, correcting the cooling water volume flow according to the feeding outlet temperature deviation and performing cooling water boundary limitation to generate the circulating pump frequency and the valve opening; Abnormality determination is performed on the feed inlet temperature, the cooling water volume flow rate, the cooling rate and the cooling water temperature in a sampling period, and heat treatment control is performed based on the abnormality determination.

[0007] As a preferred scheme of the automatic protection feed heat treatment control method, the steps of correcting the linear speed of the driving roller to obtain the feed speed include: The driving roller in the front section of the cooling section is rotated synchronously with the feed, and a pulse signal is obtained through an incremental rotary encoder installed at the end of the driving roller. The controller counts the number of pulse signals in a fixed sampling period, and obtains the rotation speed of the driving roller through the proportional relationship between the number of pulses and the number of single rotation pulses of the encoder. The theoretical linear speed is obtained by using the relationship between the outer diameter of the driving roller and the rotation speed of the driving roller. The controller generates a speed correction coefficient by using the ratio of the actual passing time to the theoretical passing time of a standard length feed sample. The speed correction coefficient is applied to the theoretical linear speed to obtain the feed speed.

[0008] As a preferred scheme of the automatic protection feed heat treatment control method, the steps of generating the process temperature include: An inlet temperature thermocouple is arranged in the area before the feed enters the cooling section, and an outlet temperature thermocouple is arranged at the end of the cooling section to obtain the inlet temperature of the feed before cooling and the outlet temperature of the feed after cooling. An inlet and outlet temperature sensor is arranged in the pipeline where the cooling water enters and leaves the water-cooled jacket to obtain the temperature of the cooling water before entering the water-cooled jacket and the temperature of the cooling water after entering the water-cooled jacket. Each temperature is substituted into a two-point linear correction relationship to correct the temperature signal, and the corrected process temperature is obtained. The corrected process temperature is subjected to exponential smoothing processing to obtain the smoothed process temperature. The process temperature includes the feed inlet temperature, the feed outlet temperature, the cooling water inlet temperature and the cooling water outlet temperature.

[0009] As a preferred scheme of the automatic protection feed heat treatment control method, the steps of obtaining the cooling water volume flow rate and establishing the corresponding relationship between the circulating pump frequency and the valve opening degree, setting the feed property, the feed inlet temperature range and the cooling water boundary include: An electromagnetic flowmeter is installed to obtain the cooling water volume flow rate. A pump water linear fitting table is obtained according to the linear fitting relationship between the cooling water volume flow rate and the circulating pump frequency. Install an electric regulating valve in front of the water-cooled jacket, and obtain the proportional relationship between the valve opening and the cooling water volume flow by measuring the stable flow of the electric regulating valve at different valve openings; Obtain the mass of the feed per unit length according to the conversion relationship between the volume of the material and the mass of the material by using the cross-sectional area of the feed and the density of the material; Obtain the average specific heat capacity based on the thermophysical data within the target temperature interval of the material; Obtain the minimum allowable feed speed according to the proportional relationship between the length of the cooling section and the maximum allowable residence time of the material; Set the target temperature at the outlet of the cooling section according to the organizational performance requirements of the product design, and set the inlet temperature range of the feed as the upper and lower limits of the inlet temperature of the feed; Set the minimum and maximum inlet temperatures of the cooling water according to the capacity of the cooling water machine, and set the allowable temperature difference of the cooling water in the water-cooled jacket.

[0010] As a preferred scheme of the automatic protection feed heat treatment control method, the specific steps for generating the cooling water volume flow are as follows: Combine the feed speed with the mass per unit length to obtain the mass flow of the feed entering the cooling section in the current sampling period; Take the temperature difference between the inlet temperature of the feed and the target outlet temperature of the feed as the temperature fraction of the feed to be reduced; According to the principle of energy conservation, calculate the instantaneous heat load required to be taken away from the feed per unit time based on the mass flow of the feed, the average specific heat capacity of the feed, and the temperature fraction of the feed to be reduced; Based on the instantaneous heat load, obtain the cooling water mass flow demand based on the specific heat capacity of the cooling water and the allowable temperature difference in the water-cooled jacket; In each sampling period, a low-speed protection condition is judged, and if the low-speed protection condition is triggered, the low limit protection constraint is performed on the cooling water volume flow demand.

[0011] As a preferred scheme of the automatic protection feed heat treatment control method, the specific steps for generating the circulating pump frequency and the valve opening are as follows: Compare the outlet temperature of the feed with the target outlet temperature of the feed to obtain the temperature deviation of the feed; According to the temperature deviation of the feed, perform a feed-forward correction on the target volume flow of the cooling water to obtain a corrected target volume flow of the cooling water; Compare the corrected target volume flow of the cooling water with the minimum safety flow of the cooling water and the maximum design flow of the circulating water to limit the reference volume flow within the limit range; Obtain the initial value of the circulating pump frequency by using the pump water linear fitting table and through the reverse calculation method; The circulating pump frequency initial value is limited in an allowable range based on a circulating pump frequency limit constraint, and a circulating pump frequency setting value is obtained; A cooling water volume flow of the electromagnetic flowmeter is read, and a valve opening degree is obtained according to the cooling water volume flow and a reference volume flow; In terms of cooling water machine temperature setting, the proportion of the instantaneous heat load at the current sampling time to the maximum heat load is used as a regulation factor to interpolate the cooling water machine outlet water temperature between the maximum allowable value and the minimum allowable value, and the outlet water temperature setting is obtained.

[0012] As a preferred scheme of the automatic protection feed heat treatment control method, the specific steps of the execution of the abnormality determination are, The feed inlet temperature is determined for temperature abnormality in each sampling period; The cooling water volume flow is limited for cooling rate in each sampling period; The cooling water inlet temperature is protected for boundary in each sampling period; The temperature abnormality determination includes that if the feed inlet temperature is greater than the upper limit of the feed inlet temperature, the high-temperature working condition of the feed inlet temperature is determined; If the feed inlet temperature is less than the lower limit of the feed inlet temperature, the low-temperature working condition of the feed inlet temperature is determined; If the feed inlet temperature is the high-temperature working condition of the feed inlet temperature, the temperature upper limit correction is applied to the cooling water volume flow after the low-speed protection; If the feed inlet temperature is the low-temperature working condition of the feed inlet temperature, the attenuation is applied to the cooling water volume flow after the low-speed protection; The cooling rate limitation protection includes that at each sampling time, the discrete form of the feed temperature change rate is calculated by using the smoothed feed outlet temperature and the smoothed feed outlet temperature at the last sampling time; A negative threshold value is set according to the maximum cooling rate that the feed material can withstand; When the feed temperature change rate is less than the negative threshold value, the cooling water target volume flow is limited based on the feed-forward correction.

[0013] As a preferred scheme of the automatic protection feed heat treatment control method, the temperature abnormality determination includes that if the feed inlet temperature is greater than the upper limit of the feed inlet temperature, the high-temperature working condition of the feed inlet temperature is determined; If the feed inlet temperature is less than the lower limit of the feed inlet temperature, the low-temperature working condition of the feed inlet temperature is determined; If the feed inlet temperature is the high-temperature working condition of the feed inlet temperature, the temperature upper limit correction is applied to the cooling water volume flow after the low-speed protection; If the feed inlet temperature is a low temperature condition, the cooling water volume flow rate after low speed protection is attenuated; The cooling rate limit protection comprises, at each sampling time, calculating the discrete form of the feed temperature change rate by using the smoothed feed outlet temperature and the smoothed feed outlet temperature at the previous sampling time; A negative value threshold is set according to the maximum cooling rate that the feed material can withstand; When the feed temperature change rate is less than the negative value threshold, the target cooling water volume flow rate is limited based on a feed-forward correction; The boundary protection comprises reading the smoothed cooling water inlet temperature at each sampling time and comparing it with the upper and lower limits of the cooling water inlet temperature; If the smoothed cooling water inlet temperature is less than the upper limit of the cooling water inlet temperature, it is determined that the cooling water is in a low water temperature condition; If the smoothed cooling water inlet temperature is greater than the upper limit of the cooling water inlet temperature, it is determined that the cooling water is in a high water temperature condition; If the cooling water inlet temperature is in a low water temperature condition, the target cooling water volume flow rate is lowered and the outlet water temperature set value of the cooling water machine is increased; If the cooling water inlet temperature is in a high water temperature condition, the refrigeration is enhanced within a safe range.

[0014] In a second aspect, the present application provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and wherein the computer program is executed by the processor to implement any step of the automatic protection feed heat treatment control method according to the first aspect of the present application.

[0015] In a third aspect, the present application provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement any step of the automatic protection feed heat treatment control method according to the first aspect of the present application.

[0016] The present application has the following beneficial effects: by using the driving roller to correct the linear speed and applying the correction coefficient to the theoretical linear speed to obtain the real feed speed, the accuracy of the feed mass flow rate is quantified, the heat load calculation has engineering consistency that can be collected and substituted, and the real-time reliability of the cooling capacity prediction is improved; by calculating the instantaneous heat load based on the energy conservation and converting the cooling water mass flow rate demand, the low speed protection, the cooling rate limit and the cooling water boundary protection are superimposed, the self-adaptive adjustment of the cooling water volume is realized, the protection timeliness under abnormal conditions is improved, and the matching degree of the equipment operation safety and the material resistance is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Fig. 1 Flow chart for the automatic protection of the feed heat treatment control method.

[0019] Fig. 2 Flow chart for obtaining the feed speed.

[0020] Fig. 3 Flow chart for generating the process temperature.

[0021] Fig. 4 Flow chart for generating the cooling water volume flow. DETAILED DESCRIPTION

[0022] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0023] In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0024] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0025] Reference Figs. 1-4 For one embodiment of the present application, the embodiment provides an automatic protection feed heat treatment control method, comprising the following steps: S1, the linear speed of the driving roller is corrected to obtain the feed speed, the inlet and outlet temperatures of the feed and cooling water are obtained and linearly corrected and smoothed to generate the process temperature.

[0026] The driving roller of the front section of the cooling section is synchronously rotated with the feed, and the pulse signal is obtained through the incremental rotary encoder installed at the end of the driving roller.

[0027] Further, a driving roller is arranged at the front section of the cooling section, close to the outlet, the outer diameter of the driving roller is calibrated to obtain the diameter, the driving roller is supported on the frame through bearings, the roller surface is provided with an anti-skid coating to ensure no obvious slip with the surface of the feed; an incremental rotary encoder is rigidly connected to one end of the shaft of the driving roller, the incremental rotary encoder outputs a fixed number of pulses per rotation.

[0028] The controller counts the number of pulse signals in a fixed sampling period, and obtains the rotational speed of the driving roller through the proportional relationship between the number of pulses and the number of pulses per rotation of the encoder.

[0029] Further, the controller collects the number of pulses of the incremental rotary encoder in a fixed sampling period, and records the pulse count value in each sampling period, and calculates the first rotational speed of the driving roller in the sampling period according to the fixed sampling period, the fixed pulse number and the pulse count value, which is represented as: ; Wherein, V1 is the first rotational speed of the driving roller, N is the pulse count value in the sampling period, P is the fixed pulse number, T is the fixed sampling period.

[0030] The theoretical linear speed is obtained by using the relationship between the diameter of the driving roller and the rotational speed of the driving roller.

[0031] Further, the theoretical linear speed of the feed is calculated by using the diameter of the driving roller and the rotational speed of the driving roller, which is represented as: ; Wherein, V is the theoretical linear speed of the feed, D is the diameter of the driving roller.

[0032] The controller generates a speed correction coefficient by using the ratio of the actual passing time to the theoretical passing time of the standard length feed sample.

[0033] The speed correction coefficient is applied to the theoretical linear speed to obtain the feed speed.

[0034] Further, in order to eliminate a small amount of slip and mechanical installation error, a speed correction coefficient is obtained by selecting a number of standard length feed samples and calculating the ratio of the actual passing time to the theoretical passing time of the cooling section; the speed correction coefficient is applied to the theoretical linear speed of the feed to obtain the feed speed, which is represented as: ; Wherein, V is the feed speed, K is the speed correction coefficient.

[0035] An inlet temperature thermocouple is arranged at a region before the feed enters the cooling section, and an outlet temperature thermocouple is arranged at the end of the cooling section to obtain the inlet temperature of the feed before cooling and the outlet temperature of the feed after cooling.

[0036] Further, on the basis of the feed speed, in order to combine the feed speed with the process temperature to form a heat load prediction, the temperatures of the feed and the cooling water need to be accurately detected; wherein the process temperature includes the inlet temperature of the feed, the outlet temperature of the feed, the inlet temperature of the cooling water and the outlet temperature of the cooling water.

[0037] Specifically, a sheathed K-type thermocouple is installed at a fixed interval position from the surface of the feed at the inlet of the cooling section, the thermocouple end of the sheathed K-type thermocouple is opposite to the movement direction of the feed, the sheathed K-type thermocouple is sealingly connected with the furnace shell through a protection sleeve, the thermocouple signal is converted through a transmitter to obtain the inlet temperature of the feed before cooling.

[0038] A sheathed K-type thermocouple is also installed at the outlet of the cooling section, and the installation method is the same as that at the inlet of the cooling section to obtain the outlet temperature of the feed after cooling.

[0039] An inlet and outlet temperature sensor is arranged on the pipeline through which the cooling water enters and leaves the water cooling jacket respectively to obtain the inlet temperature of the cooling water before entering the water cooling jacket and the outlet temperature of the cooling water after entering the water cooling jacket.

[0040] Further, a temperature measuring nozzle is opened on the main pipeline before the cooling water enters the water cooling jacket, and a sleeve type temperature sensor is inserted to obtain the temperature of the cooling water before entering the water cooling jacket.

[0041] The sleeve type temperature sensor can be selected from platinum resistance, low temperature thermocouple, etc.

[0042] The same type of sleeve type temperature sensor as that arranged before the cooling water enters the water cooling jacket is arranged on the water return pipeline after the cooling water leaves the water cooling jacket to obtain the temperature of the cooling water after entering the water cooling jacket.

[0043] The controller substitutes each temperature into a two-point linear correction relationship respectively to correct the temperature signal and obtain the corrected process temperature.

[0044] Further, in order to eliminate the errors of the sleeve type temperature sensor and the transmitter, a two-point calibration is performed on the process temperature detection channel, specifically, the linear correction relationship obtained in the calibration process is assumed as y = ax + b, which is expressed as: ; Wherein, y is the corrected process temperature, x is the uncorrected process temperature, a is a proportional correction coefficient of the process temperature, b is a zero point correction coefficient of the process temperature.

[0045] It should be noted that the proportional correction coefficient of the process temperature and the zero point correction coefficient of the process temperature are obtained by the process temperature calibration process.

[0046] The corrected process temperature is subjected to exponential smoothing to obtain a smoothed process temperature.

[0047] S2, obtain the cooling water volume flow and establish the corresponding relationship between the circulating pump frequency and the valve opening, set the feed material properties, the feed inlet temperature range and the cooling water boundary.

[0048] Install an electromagnetic flowmeter to obtain the cooling water volume flow.

[0049] Further, under the premise that the feed speed and the process temperature have been obtained, in order to convert the heat demand into executable cooling water volume flow, the cooling water volume flow needs to be measured and adjusted.

[0050] Specifically, an electromagnetic flowmeter is installed on the straight pipe section before the cooling water enters the water-cooled jacket, the electromagnetic flowmeter installation length meets the requirements of the front and rear straight pipe sections, and the output signal of the electromagnetic flowmeter is converted through a transmitter to obtain the cooling water volume flow measurement value.

[0051] Two-point calibration is performed on the electromagnetic flowmeter to obtain the cooling water volume flow.

[0052] Through field test, record the stable water output of the circulating pump at different working frequencies, according to the linear fitting relationship between the cooling water volume flow and the circulating pump frequency, form the pump water linear fitting table between the cooling water volume flow and the circulating pump frequency in the controller.

[0053] Further, a variable frequency controlled centrifugal circulating pump is selected as the main power source of the cooling water, the frequency of the centrifugal circulating pump is set, the corresponding stable flow is measured at several different frequency points through trial operation, and fitting is performed to obtain the linear fitting relationship between the cooling water volume flow and the circulating pump frequency, and the pump water linear fitting table is obtained, which is expressed as: ; Wherein, is the cooling water volume flow, represents the circulating pump comprehensive flow gain coefficient, represents the residual flow of the circulating pump at the lowest frequency, is the circulating pump frequency.

[0054] It should be noted that the pump group comprehensive flow gain coefficient and the residual flow of the pump group at the lowest frequency are determined by fitting during the trial operation.

[0055] An electric regulating valve is installed before the water jacket, and the proportional relationship between the valve opening and the cooling water volume flow is obtained by measuring the stable flow of the electric regulating valve at different valve openings.

[0056] Further, an electric regulating valve is installed before the water jacket, and the proportional relationship between the valve opening and the cooling water volume flow is obtained by measuring the stable flow of the electric regulating valve at different valve openings The centrifugal circulating pump frequency is kept unchanged, and the corresponding cooling water volume flow is measured, which is represented as: ; wherein, represents the flow coefficient of the regulating valve at the current working condition, represents the valve opening of the electric regulating valve.

[0057] It should be noted that the flow coefficient of the regulating valve at the current working condition is actually obtained during the measurement.

[0058] It should be noted that in actual operation, the circulating pump frequency is used for rough flow adjustment, and the valve opening is used for fine compensation according to the pump water linear fitting table.

[0059] The cross-sectional area of the feed and the material density are used to obtain the mass per unit length of the feed according to the conversion relationship between the material volume and the material mass.

[0060] Further, the feed physical property parameters and the process protection threshold are quantitatively set on the basis of the feed speed, the process temperature, and the cooling water volume flow.

[0061] Specifically, for a standard long strip-shaped feed, the cross-sectional area is denoted as , the material density is denoted as , and the mass per unit length of the feed is denoted as , which is represented as: ; It should be noted that the average specific heat capacity of the feed in the target temperature interval is obtained from the feed manual.

[0062] The minimum allowable feed speed is obtained according to the proportional relationship between the cooling section length and the maximum allowable residence time of the material.

[0063] Further, the maximum residence time that can be provided by the total length of the cooling section is determined according to the heat treatment process requirement and the maximum allowable cooling speed of the material, and the allowable minimum feed speed is obtained, which is represented as: ; wherein, is the allowable minimum feed speed, is the total length of the cooling section, is the maximum residence time.

[0064] According to the organizational performance requirements of product design, set the target temperature of the cooling section outlet, and set the inlet temperature range of the feed as the upper and lower limits of the feed inlet temperature.

[0065] According to the cooling water machine capacity, set the minimum and maximum inlet temperature allowed by the cooling water, and set the temperature difference allowed by the cooling water in the water-cooled jacket.

[0066] Further, in order to avoid damage to the equipment or condensation caused by cooling water, according to the nameplate parameters of the cooling water machine, set the lower limit of the cooling water inlet temperature and the upper limit of the cooling water inlet temperature, and set the temperature difference allowed by the cooling water in the water-cooled jacket.

[0067] It should be noted that the difference between the cooling water inlet temperature and the cooling water outlet temperature is taken as the temperature difference of the cooling water in the water-cooled jacket.

[0068] S3, according to the feed speed and the feed property, calculate the instantaneous heat load and convert the cooling water mass flow demand, combine with the low speed constraint to generate the cooling water volume flow.

[0069] In each sampling period, combine the feed speed with the unit length mass to obtain the feed mass flow entering the cooling section in the current sampling period.

[0070] Further, at each sampling time, according to the feed speed and the unit length mass of the feed, calculate the feed mass flow, which is expressed as: ; Wherein, is the feed mass flow.

[0071] It should be noted that if the feed speed is close to zero, but has not yet completely stopped, the feed mass flow will automatically tend to zero.

[0072] The temperature difference between the feed inlet temperature and the feed target outlet temperature is taken as the temperature fraction of the feed being reduced.

[0073] It should be noted that if the temperature fraction of the feed being reduced is less than or equal to zero, it means that the feed does not need to be cooled or does not need to be heated, and the controller will no longer give the instruction to increase the cooling water.

[0074] According to the energy conservation principle, calculate the instantaneous heat load that needs to be taken away from the feed per unit time according to the feed mass flow, the average specific heat capacity of the feed, and the temperature fraction of the feed being reduced.

[0075] Further, according to the energy conservation relationship, calculate the instantaneous heat load that needs to be taken away from the feed per unit time using the feed mass flow, the average specific heat capacity, and the temperature fraction, which is expressed as: ; Wherein, is the instantaneous heat load, is the average specific heat capacity of the feed, is the temperature reduction fraction of the feed.

[0076] It should be noted that if the temperature reduction fraction of the feed is greater than zero, the instantaneous heat load that needs to be taken away from the feed per unit time is positive, indicating that heat needs to be taken away from the feed; if the temperature reduction fraction of the feed is less than or equal to zero, the instantaneous heat load that needs to be taken away from the feed per unit time is zero, indicating that even if there is a subsequent cooling water volume flow calculation link, there will be no additional cooling demand.

[0077] Based on the instantaneous heat load, the cooling water specific heat capacity and the allowable temperature difference in the water-cooled jacket are used to obtain the cooling water mass flow demand.

[0078] Further, at each sampling time, the cooling water inlet temperature and the allowable temperature difference of the cooling water in the water-cooled jacket are used to estimate the target outlet temperature of the cooling water in the water-cooled jacket, which is represented as: ; wherein, is the target outlet temperature of the cooling water in the water-cooled jacket, is the cooling water inlet temperature, is the allowable temperature difference of the cooling water in the water-cooled jacket.

[0079] According to the specific heat capacity of the cooling water and the allowable temperature difference of the cooling water in the water-cooled jacket, the energy balance relationship is used to calculate the cooling water mass flow demand, which is represented as: ; wherein, is the cooling water mass flow demand, is the specific heat capacity of the cooling water, is the allowable temperature difference of the cooling water in the water-cooled jacket.

[0080] It should be noted that when the instantaneous heat load that needs to be taken away from the feed per unit time is greater than zero, the cooling water mass flow demand is positive, corresponding to the actual need for water supply; when the instantaneous heat load that needs to be taken away from the feed per unit time is zero, the cooling water mass flow demand is zero, indicating that no additional water flow is needed due to the current feed cooling.

[0081] Based on the cooling water mass flow demand, the cooling water density and the time unit are converted to obtain the cooling water volume flow demand.

[0082] Further, the cooling water mass flow demand is converted into the cooling water volume flow demand using the cooling water density, which is represented as: ; wherein, for the cooling water density, for the cooling water volume flow demand.

[0083] Low-speed protection condition is determined in each sampling period, and if the low-speed protection condition is triggered, the low limit protection constraint is performed on the cooling water volume flow demand.

[0084] Further, the feed speed is compared with the allowed minimum feed speed at each sampling time, and if the feed speed is less than or equal to the allowed minimum feed speed, the low-speed protection is performed in the current period, and the heat load prediction is marked as the low-speed protection condition.

[0085] To prevent the excessive water flow from being given according to the normal prediction result when the feed speed is low or stopped, the low limit protection constraint is performed when the cooling water target volume flow is calculated.

[0086] The low limit protection constraint is specifically that if the low-speed protection condition is triggered, the cooling water target volume flow is limited to not exceed the cooling water maximum safety flow in the current period, that is, if the cooling water volume flow demand is less than the cooling water maximum safety flow, the cooling water target volume flow is the cooling water volume flow; and if the cooling water volume flow demand is greater than or equal to the cooling water maximum safety flow, the cooling water target volume flow is the cooling water maximum safety flow.

[0087] It should be noted that the cooling water maximum safety flow is set according to the equipment manual.

[0088] The change of the cooling water target volume flow of the adjacent sampling period is prevented from jumping.

[0089] Further, to avoid the excessive jump of the cooling water target volume flow in the consecutive sampling periods, causing the high action opening of the circulating pump and the valve, the anti-jump constraint is performed on the cooling water target volume flow of the adjacent sampling period.

[0090] The anti-jump constraint is specifically that the difference between the amplitude-limited cooling water target volume flow of the last period and the allowed maximum flow change of the adjacent sampling period is taken as the lower limit of the anti-jump constraint; the sum of the amplitude-limited cooling water target volume flow of the last period and the allowed maximum flow change of the adjacent sampling period is taken as the upper limit of the anti-jump constraint; if the cooling water target volume flow is greater than the lower limit of the anti-jump constraint and the cooling water target volume flow is less than the upper limit of the anti-jump constraint, the anti-jump constraint is not performed; if the cooling water target volume flow is less than or equal to the lower limit of the anti-jump constraint, the lower limit of the anti-jump constraint is taken as the cooling water target volume flow of the current period; and if the cooling water target volume flow is greater than or equal to the upper limit of the anti-jump constraint, the upper limit of the anti-jump constraint is taken as the cooling water target volume flow of the current period.

[0091] It should be noted that the maximum flow variation allowed by the adjacent sampling period is usually determined by the maximum frequency variation rate per unit time allowed by the frequency converter of the circulating pump, which is obtained according to the linear fitting relationship between the circulating pump and the cooling water.

[0092] S4, based on the process temperature, correcting the cooling water volume flow according to the feed outlet temperature deviation and performing cooling water boundary limitation to generate the circulating pump frequency and the valve opening.

[0093] The feed outlet temperature is compared with the feed target outlet temperature to obtain the feed temperature deviation.

[0094] Further, considering that the actual cooling effect will be affected by factors such as environment and fouling, the feed temperature deviation is used to correct the cooling water target volume flow.

[0095] Specifically, the feed outlet temperature is read at each sampling time, and the feed temperature deviation is obtained by subtracting the feed target outlet temperature.

[0096] It should be noted that the feed temperature deviation is greater than zero, indicating that the cooling is insufficient; the feed temperature deviation is less than zero, indicating that the cooling is too strong.

[0097] The feed temperature deviation is used to correct the cooling water target volume flow once, and the corrected cooling water target volume flow is obtained.

[0098] Further, the feedforward correction is represented as: ; Wherein, is the corrected cooling water target volume flow, is the cooling water target volume flow after anti-jump constraint, is the proportional coefficient of the feed temperature deviation to the cooling water target volume flow correction, which is determined by trial operation, is the feed temperature deviation.

[0099] It should be noted that, the unit of .

[0100] It should be noted that when the feed temperature deviation is greater than zero, the corrected cooling water target volume flow is increased compared with the cooling water target volume flow after anti-jump constraint, so as to enhance the cooling; when the feed temperature deviation is less than zero, the corrected cooling water target volume flow is reduced, so as to weaken the cooling.

[0101] The boundary comparison is performed between the corrected cooling water target volume flow and the cooling water minimum safety flow and the circulating water design maximum flow to make the reference volume flow fall within the limit range.

[0102] Further, in order to prevent the modified cooling water target volume flow from being negative or exceeding the upper limit of the device, the modified cooling water target volume flow is physically constrained.

[0103] Specifically, if the modified cooling water target volume flow is greater than the minimum safety flow of the cooling water and less than the maximum design flow of the circulating water, the modified cooling water target volume flow is taken as the reference volume flow; if the modified cooling water target volume flow is less than or equal to the minimum safety flow of the cooling water, the minimum safety flow of the cooling water is taken as the reference volume flow; if the modified cooling water target volume flow is greater than or equal to the maximum design flow of the circulating water, the maximum design flow of the circulating water is taken as the reference volume flow.

[0104] It should be noted that the values of the minimum safety flow of the cooling water and the maximum design flow of the circulating water system are determined by the design of the device.

[0105] The pump water linear fitting table is used to obtain the initial value of the circulating pump frequency by table look-up inversion.

[0106] Further, according to the linear fitting relationship between the cooling water volume flow and the circulating pump frequency, the reference volume flow is inversely calculated at each sampling time to obtain the initial value of the circulating pump frequency.

[0107] Based on the circulating pump frequency limit constraint, the initial value of the circulating pump frequency is limited within the allowed range to obtain the set value of the circulating pump frequency.

[0108] Further, in order to ensure that the circulating pump operates in a safe operating range, the initial value of the circulating pump frequency is limited within the allowed range by the circulating pump frequency limit constraint.

[0109] Specifically, if the initial value of the circulating pump frequency is greater than the minimum allowable operating frequency of the circulating pump and less than the maximum allowable operating frequency of the circulating pump, the initial value of the circulating pump frequency is taken as the set value of the circulating pump frequency; if the initial value of the circulating pump frequency is less than or equal to the minimum allowable operating frequency of the circulating pump, the minimum allowable operating frequency of the circulating pump is taken as the set value of the circulating pump frequency; if the initial value of the circulating pump frequency is greater than or equal to the maximum allowable operating frequency of the circulating pump, the maximum allowable operating frequency of the circulating pump is taken as the set value of the circulating pump frequency.

[0110] The cooling water volume flow of the electromagnetic flowmeter is read, and the valve opening is obtained according to the cooling water volume flow and the reference volume flow.

[0111] Further, at each sampling time, the cooling water volume flow at the current time is read by the electromagnetic flowmeter, and the difference between the cooling water volume flow and the reference volume flow is calculated to obtain the cooling water volume flow deviation.

[0112] The new valve opening is obtained by adding the cooling water volume flow deviation to the valve opening of the previous cycle.

[0113] It should be noted that when the cooling water volume flow deviation is greater than zero, the valve opening is increased; when the cooling water volume flow deviation is less than zero, the valve opening is reduced.

[0114] In terms of cooling water machine temperature setting, the proportion of the instantaneous heat load at the current sampling time to the maximum heat load is used as a regulation factor to interpolate the cooling water machine outlet water temperature between the maximum and minimum allowable values to obtain the outlet water temperature setting.

[0115] Further, the maximum heat load of the cooling water equipment design is set, and at each sampling time, the instantaneous heat load calculated is used to calculate the heat load relative coefficient, which is represented as: ; Among them, the heat load relative coefficient, is the maximum heat load.

[0116] It should be noted that if the heat load relative coefficient is greater than 1, the heat load relative coefficient is truncated to 1; if the heat load relative coefficient is less than 1, the heat load relative coefficient is set to 0.

[0117] The upper and lower limits of the cooling water machine outlet water temperature are set, and based on the heat load relative coefficient, the cooling water machine outlet water temperature setting value at the current time is obtained by using linear interpolation.

[0118] The cooling water machine outlet water temperature setting value at the current time is sent to the cooling water machine as the outlet water temperature target, and the cooling water machine internally implements tracking of the outlet water temperature according to its own control logic, thereby completing the flow and water temperature dual-variable joint control at the equipment level.

[0119] S5, execute abnormality judgment on the feed inlet temperature, cooling water volume flow cooling rate and cooling water temperature within the sampling period, and perform heat treatment control based on the abnormality judgment.

[0120] Temperature abnormality judgment is performed on the feed inlet temperature.

[0121] Further, considering the case of abnormally high or low feed temperature, the cooling intensity and alarm linkage protection when the feed temperature is abnormal.

[0122] Specifically, at the sampling time, the smoothed feed inlet temperature is read, and whether there is a temperature abnormality is judged according to the set upper limit of the feed inlet temperature and the lower limit of the feed inlet temperature.

[0123] Among them, the temperature abnormality is judged as follows B1-B3: B1: If the feed inlet temperature is greater than the upper limit of the feed inlet temperature, it is judged as a high temperature working condition of the feed inlet temperature.

[0124] B2: If the feed inlet temperature is less than the lower limit of the feed inlet temperature, it is determined that the feed inlet temperature is low temperature condition.

[0125] B3: If the feed inlet temperature is less than or equal to the upper limit of the feed inlet temperature and the feed temperature is greater than or equal to the lower limit of the feed inlet temperature, it is determined that the feed inlet temperature is normal condition.

[0126] If the feed inlet temperature is the high temperature condition of the feed inlet temperature, the temperature upper limit correction is applied on the basis of the cooling water volume flow rate after low speed protection.

[0127] Further, for the high temperature condition of the feed inlet temperature, the cooling is allowed to be moderately strengthened under the premise of ensuring the safety of the equipment, but cannot be increased unlimitedly, so the temperature upper limit correction is applied on the basis of the flow rate after low speed protection.

[0128] Wherein, the temperature upper limit correction on the basis of the flow rate after low speed protection is specifically that, after the feed speed is low speed protected and the corresponding cooling water volume flow rate is obtained, the feed inlet temperature is compared with the highest allowable value of the feed inlet temperature; when the feed inlet temperature is higher than the highest allowable value of the feed inlet temperature, the temperature excess is taken as the driving amount to increase the cooling water volume flow rate.

[0129] At the same time, a high temperature alarm signal is triggered to prompt the operator to check the front furnace temperature or the feed state.

[0130] If the feed inlet temperature is too low, the cooling water volume flow rate after low speed protection is attenuated.

[0131] Further, for the low temperature condition of the feed inlet temperature, the large cooling of the already low temperature feed is avoided, and the flow rate after low speed protection is attenuated.

[0132] Wherein, the attenuation of the flow rate after low speed protection is specifically that, after the feed speed is low speed protected and the corresponding cooling water volume flow rate is obtained, the feed inlet temperature is compared with the minimum allowable value of the feed inlet temperature; when the feed inlet temperature is lower than the minimum allowable value of the feed inlet temperature, the amplitude that the feed inlet temperature is lower than the minimum allowable value of the feed inlet temperature is taken as the attenuation basis to reduce the cooling water volume flow rate.

[0133] Based on the change of the cooling water volume flow rate, the circulating pump frequency and the valve opening degree are re-matched and constrained.

[0134] Further, corresponding to the change of the cooling water volume flow rate, the circulating pump frequency and the valve opening degree need to be re-constrained, so that the circulating pump frequency and the valve opening degree match the cooling water volume flow rate.

[0135] Wherein, the re-matching constraint is specifically: according to the pump water linear fitting table, the circulating pump frequency under the temperature anomaly protection is calculated, and the circulating pump frequency is limited between the minimum working frequency allowed by the circulating pump and the maximum working frequency allowed by the circulating pump; then based on the flow deviation before and after the change of the cooling water volume flow, the valve opening is updated according to the proportional relationship between the valve opening and the cooling water volume flow.

[0136] The cooling water volume flow is limited by the cooling rate.

[0137] Further, when the feed speed and the feed inlet temperature are normal, there is still a risk that the feed outlet temperature will drop too fast, causing the feed material to crack, so the cooling rate needs to be monitored and limited.

[0138] Wherein, the cooling rate limit protection is specifically: at each sampling time, the smoothed feed outlet temperature and the smoothed feed outlet temperature at the last sampling time are used to calculate the discrete form of the feed temperature change rate, which is expressed as: ; Wherein, is the feed temperature change rate, is the smoothed feed outlet temperature, is the smoothed feed outlet temperature at the last sampling time, is the sampling interval.

[0139] According to the maximum cooling rate that the feed material can withstand, a negative threshold value is set, which is usually in the range of [-5, -1].

[0140] It should be noted that if the negative threshold value range is too large, the cooling will be too fast, causing the feed surface temperature to drop suddenly and causing cracks; if the negative threshold value range is too small, the cooling will be insufficient, the feed product will not meet the required standard, and the protection will be frequently triggered, reducing efficiency.

[0141] When the feed temperature change rate is less than the negative threshold value, it means that the cooling rate is too fast, and the cooling intensity needs to be weakened. The cooling water target volume flow is limited based on the feed-forward correction, which is expressed as: ; Wherein, is the cooling water target volume flow after considering the cooling rate protection, is the cooling water target volume flow before considering the cooling rate protection, is the negative threshold value.

[0142] The cooling water inlet temperature is protected by the boundary.

[0143] Further, the cooling water subcooling can cause condensation, thermal shock and even surface cracks of the material of the equipment, and the cooling water inlet temperature needs to be protected.

[0144] The boundary protection is specifically reading the smoothed cooling water inlet temperature at each sampling time, and comparing it with the upper and lower limits of the cooling water inlet temperature; if the smoothed cooling water inlet temperature is less than the upper limit of the cooling water inlet temperature, it is determined that the cooling water is in a low water temperature condition; if the smoothed cooling water inlet temperature is greater than the upper limit of the cooling water inlet temperature, it is determined that the cooling water is in a high water temperature condition.

[0145] If the cooling water inlet temperature is in a low water temperature condition, the cooling water target volume flow is adjusted downward, and the outlet water temperature set value of the cooling water machine is increased to prevent cold shock to the feed and the equipment.

[0146] If the cooling water inlet temperature is in a high water temperature condition, the cooling effect can be affected, and the refrigeration is enhanced within the safety allowable range.

[0147] Further, in order to avoid the situation that once the protection is entered, it cannot be exited, the protection state is memorized and recovered.

[0148] Specifically, a protection state variable is defined, and when the protection state variable is 0, it represents a normal mode; when the protection state variable is 1, it represents a protection mode.

[0149] At each sampling time, if any of the following conditions is met: triggering a low-speed protection condition, triggering a feed inlet temperature anomaly, triggering a cooling rate limit protection, and triggering a cooling water inlet temperature boundary protection, the protection state variable is set to 1.

[0150] Once the protection state variable is set to 1, the protected cooling water volume flow, valve opening and circulating pump frequency are used as the execution amount in the current and subsequent sampling periods, and a protection mode prompt is displayed to the operator interface.

[0151] If it is determined that the current condition has returned to normal, a counter is defined, and when the sampling period meets the following conditions simultaneously: the low-speed protection condition is not triggered, the feed inlet temperature anomaly is not triggered, the cooling rate limit protection is not triggered, and the cooling water inlet temperature boundary protection is not triggered, the counter value is +1, otherwise the normal counter is reset to 0.

[0152] A minimum normal period number, such as 30 sampling periods, is set, and when the counter value is greater than or equal to the minimum normal period number, it is considered that the condition has been stably restored to normal, and the protection state variable is set to 0.

[0153] The embodiment also provides a computer device suitable for the automatic protection of the feed thermal treatment control method, comprising a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions to realize the automatic protection of the feed thermal treatment control method proposed in the above embodiment.

[0154] The computer device can be a terminal, and the computer device comprises a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner. The wireless manner can be achieved through WIFI, an operator network, NFC (Near Field Communication) or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or a key, trackball or touchpad arranged on the shell of the computer device, or an external keyboard, touchpad or mouse, etc.

[0155] The embodiment also provides a storage medium having a computer program stored thereon, the program being executed by a processor to realize the automatic protection of the feed thermal treatment control method proposed in the above embodiment. The storage medium can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic memory, a flash memory, a magnetic disk or an optical disk.

[0156] To sum up, the application realizes accurate quantification of the mass flow of the feed by using the driving roller to correct the linear speed and applying the correction coefficient to the theoretical linear speed to obtain the real feed speed, ensures that the heat load calculation has the engineering consistency of being collectable and substitutable, and improves the real-time reliability of the cooling capacity prediction; the application realizes self-adaptive adjustment of the cooling water volume by calculating the instantaneous heat load based on the energy conservation and converting the cooling water mass flow demand, simultaneously superimposes the low-speed protection, the cooling rate limitation and the cooling water boundary protection, improves the timeliness of the protection under abnormal working conditions, and enhances the matching degree of the equipment operation safety and the material resistance.

[0157] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. An automatic protection feeding heat treatment control method, characterized in that: include, The feed rate is obtained by using the drive roller to correct the linear speed, and the inlet and outlet temperatures of the feed and cooling water are obtained and then linearly corrected and smoothed to generate the process temperature. Obtain the volumetric flow rate of cooling water and establish the correspondence between the frequency of the circulating pump and the valve opening. Set the feed properties, feed inlet temperature range, and cooling water boundary. The instantaneous heat load is calculated based on the feed rate and feed properties, and the cooling water mass flow rate requirement is converted. The cooling water volume flow rate is then generated by combining the low-speed constraint. Based on the process temperature, the cooling water volume flow rate is corrected according to the temperature deviation between the feed outlet and the cooling water boundary is restricted, and the circulation pump frequency and valve opening are generated. During the sampling period, anomaly detection is performed on the feed inlet temperature, cooling water volume flow rate, cooling rate, and cooling water temperature, and heat treatment control is performed based on the anomaly detection.

2. The automatic protection feeding heat treatment control method as described in claim 1, characterized in that: The specific steps for obtaining the feed speed by correcting the linear velocity using a drive roller are as follows: The drive roller at the front of the cooling section rotates synchronously with the feed, and pulse signals are obtained by an incremental rotary encoder installed at the end of the drive roller. The controller counts the number of pulse signals within a fixed sampling period and obtains the rotational speed of the drive roller by the ratio of the number of pulses to the number of pulses per encoder revolution. The theoretical linear velocity is obtained by utilizing the relationship between the outer diameter of the drive roller and the rotational speed of the drive roller; The controller generates a speed correction coefficient by using the ratio of the actual throughput time to the theoretical throughput time measured from a standard length feed sample. The feed rate is obtained by applying a speed correction factor to the theoretical linear velocity.

3. The automatic protection feeding heat treatment control method as described in claim 2, characterized in that: The specific steps for the generation process temperature are as follows: An inlet temperature thermocouple is installed in the area before the feed enters the cooling section, and an outlet temperature thermocouple is installed at the end of the cooling section to obtain the inlet temperature of the feed before cooling and the outlet temperature of the feed after cooling. Inlet and outlet temperature sensors are installed on the pipes where cooling water enters and exits the water-cooling jacket to obtain the temperature of cooling water before entering the water-cooling jacket and the temperature of cooling water after entering the water-cooling jacket. Each temperature is substituted into the two-point linear correction relationship to correct the temperature signal and obtain the corrected process temperature. The corrected process temperature is exponentially smoothed to obtain the smoothed process temperature. The process temperature includes the feed inlet temperature, the feed outlet temperature, the cooling water inlet temperature, and the cooling water outlet temperature.

4. The automatic protection feeding heat treatment control method as described in claim 3, characterized in that: The specific steps for obtaining the cooling water volumetric flow rate and establishing the correspondence between the circulating pump frequency and valve opening, setting the feed properties, feed inlet temperature range, and cooling water boundary are as follows: Install an electromagnetic flow meter to obtain the volumetric flow rate of cooling water; Based on the linear fitting relationship between cooling water volumetric flow rate and circulating pump frequency, a pump-water linear fitting table is obtained. An electric regulating valve is installed in front of the water-cooled jacket. The stable flow rate of the electric regulating valve at different valve openings is measured to obtain the proportional relationship between the valve opening and the volumetric flow rate of the cooling water. By utilizing the cross-sectional area of ​​the feed and the material density, the feed mass per unit length can be obtained based on the conversion relationship between material volume and material mass. The average specific heat capacity is obtained based on the thermophysical property data of the material within the target temperature range. The minimum allowable feed rate is obtained based on the ratio between the length of the cooling section and the maximum allowable residence time of the material. Based on the organizational performance requirements of the product design, the target temperature of the cooling section outlet is set, and the range of the inlet temperature for material acceptance is used as the upper and lower limits of the inlet temperature. Based on the capacity of the cooling water chiller, set the minimum and maximum allowable inlet temperatures of the cooling water, and set the allowable temperature difference of the cooling water in the water-cooled jacket.

5. The automatic protection feeding heat treatment control method as described in claim 4, characterized in that: The specific steps for generating the cooling water volumetric flow rate are as follows: In each sampling cycle, the feed rate is combined with the mass per unit length to obtain the feed mass flow rate entering the cooling section in the current sampling cycle; The temperature difference between the feed inlet temperature and the target feed outlet temperature is taken as the temperature reduction of the feed. Based on the principle of energy conservation, the instantaneous heat load that needs to be removed from the feed per unit time is calculated using the feed mass flow rate, the average specific heat capacity of the feed, and the percentage of temperature reduction in the feed. Based on the instantaneous heat load, the cooling water mass flow rate requirement is obtained by taking into account the specific heat capacity of the cooling water and the allowable temperature difference in the water-cooled jacket. In each sampling period, a low-speed protection condition is determined. If the low-speed protection condition is triggered, a low-limit protection constraint is applied to the cooling water volume flow rate requirement.

6. The automatic protection feeding heat treatment control method as described in claim 5, characterized in that: The specific steps for generating the circulating pump frequency and valve opening are as follows: The feed outlet temperature is compared with the target feed outlet temperature to obtain the feed temperature deviation. The target volumetric flow rate of cooling water is corrected once based on the feed temperature deviation to obtain the corrected target volumetric flow rate of cooling water. The corrected target volumetric flow rate of cooling water is compared with the minimum security flow rate of cooling water and the maximum design flow rate of circulating water to ensure that the reference volumetric flow rate falls within the limit range. The initial value of the circulating pump frequency is obtained by looking up the table and calculating back using the linear fitting table of the pump. Based on the frequency limit constraint of the circulating pump, the initial value of the circulating pump frequency is limited to the allowable range, and the set value of the circulating pump frequency is obtained. Read the cooling water volumetric flow rate of the electromagnetic flow meter, and obtain the valve opening based on the cooling water volumetric flow rate and the reference volumetric flow rate; Regarding the setting of the cooling water machine temperature, the ratio of the instantaneous heat load at the current sampling time to the maximum heat load is used as an adjustment factor to interpolate the cooling water machine outlet temperature between the highest and lowest allowable values ​​to obtain the outlet temperature setting.

7. The automatic protection feeding heat treatment control method as described in claim 6, characterized in that: The specific steps for determining execution anomalies are as follows: Temperature anomalies are determined at the feed inlet temperature during each sampling period; Cooling rate limiting protection is implemented for cooling water volume flow rate in each sampling period; Boundary protection is implemented for the cooling water inlet temperature during each sampling cycle.

8. The automatic protective feeding heat treatment control method as described in claim 7, characterized in that: The temperature anomaly determination includes determining that if the feed inlet temperature is greater than the upper limit of the feed inlet temperature, it is a high temperature condition at the feed inlet. If the feed inlet temperature is lower than the lower limit of the feed inlet temperature, it is determined to be a low feed inlet temperature operating condition; If the feed inlet temperature is a high temperature condition, then apply a temperature upper limit correction based on the cooling water volume flow rate after low speed protection. If the feed inlet temperature is low, then the cooling water volume flow rate after low speed protection will be attenuated. The cooling rate limiting protection includes calculating the discrete feed temperature change rate at each sampling time using the smoothed feed outlet temperature and the smoothed feed outlet temperature at the previous sampling time; A negative threshold value is set based on the maximum cooling rate that the feed material can withstand; When the rate of change of feed temperature is less than the negative threshold, the target volumetric flow rate of cooling water is limited based on feedforward correction. The boundary protection includes reading the smoothed cooling water inlet temperature at each sampling time and comparing it with the upper and lower limits of the cooling water inlet temperature. If the smoothed cooling water inlet temperature is less than the upper limit of the cooling water inlet temperature, the cooling water is determined to be in a low water temperature condition. If the smoothed cooling water inlet temperature is greater than the upper limit of the cooling water inlet temperature, the cooling water is determined to be in a high water temperature condition. If the cooling water inlet temperature is low, the target volumetric flow rate of the cooling water should be reduced, and the outlet water temperature setting of the cooling water machine should be increased. If the cooling water inlet temperature is high and the cooling water is operating at a high temperature, enhance the cooling capacity within the safe allowable range.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the automatic protection feeding heat treatment control method according to any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the automatic protection feeding heat treatment control method according to any one of claims 1 to 8.

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