An automatic protection feed heat treatment control method, device and medium

Abstract

The application discloses an automatic protection feeding heat treatment control method and device and medium, relates to the technical field of heat treatment process control, and comprises the following steps: acquiring cooling water volume flow and establishing the corresponding relationship between the circulating pump frequency and the valve opening, setting the feeding material property, the feeding inlet temperature range and the cooling water boundary; calculating the instantaneous heat load according to the feeding speed and the feeding material 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 the cooling water boundary limitation to generate the circulating pump frequency and the valve opening; performing the abnormality judgment on the feeding inlet temperature, the cooling water volume flow cooling rate and the cooling water temperature in the sampling period, and performing the heat treatment control based on the abnormality judgment. The application realizes the accurate quantification of the feeding mass flow and the adjustment ability of the cooling water quantity.

Description

Technical Field

[0001] This invention relates to the field of heat treatment process control technology, and in particular to an automatic protective feeding heat treatment control method, equipment and medium. Background Technology

[0002] In continuous heat treatment production, the feed material needs to enter the cooling section rapidly after exiting the furnace. Its temperature change directly affects the material's microstructure, dimensional stability, and adaptability to subsequent processing. To achieve real-time control of the temperature field, conventional control methods construct heat transfer relationships based on thermophysical parameters, feed rate, and water-cooled jacket temperature difference, enabling dynamic management of the cooling process. This approach is widely used in industrial heat treatment equipment and has good engineering applicability and a clear theoretical basis.

[0003] However, conventional methods, when dealing with continuous feeding processes, often need to address the combined effects of feed rate fluctuations, inlet temperature disturbances, and cooling water temperature changes. Regarding immediate response, the correction for outlet temperature deviations is usually limited by the coupling degree of the control chain, making it difficult to maintain stable cooling capacity matching when the heat load changes rapidly. Furthermore, because the cooling rate, inlet temperature, and cooling water boundary must simultaneously meet material tolerance requirements, traditional control strategies have relatively simple protection logic for cooling flow under abnormal operating conditions, easily leading to adjustments lagging behind actual operating condition changes, thus making it difficult to balance equipment safety and the continuity of material cooling. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides an automatic protection feeding heat treatment control method to solve the problems of insufficient real-time matching of cooling amount and insensitivity to abnormal temperature regulation in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, the present invention provides an automatic protection feeding heat treatment control method, which includes: using a drive roller to correct the linear speed to obtain the feeding speed, obtaining the inlet and outlet temperatures of the feed and cooling water and performing linear correction and smoothing processes to generate the process temperature;

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] In a preferred embodiment of the automatic protective feeding heat treatment control method of the present invention, the specific steps of using a drive roller to correct the linear velocity to obtain the feeding velocity are as follows:

[0013] 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.

[0014] 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.

[0015] 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;

[0016] 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.

[0017] The feed rate is obtained by applying a speed correction factor to the theoretical linear velocity.

[0018] In a preferred embodiment of the automatic protective feeding heat treatment control method of the present invention, the specific steps for determining the generation process temperature are as follows:

[0019] 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.

[0020] 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.

[0021] Each temperature is substituted into the two-point linear correction relationship to correct the temperature signal and obtain the corrected process temperature.

[0022] The corrected process temperature is exponentially smoothed to obtain the smoothed process temperature.

[0023] The process temperature includes the feed inlet temperature, the feed outlet temperature, the cooling water inlet temperature, and the cooling water outlet temperature.

[0024] As a preferred embodiment of the automatic protective feeding heat treatment control method of the present invention, the steps of obtaining the cooling water volumetric flow rate and establishing the correspondence between the circulating pump frequency and the valve opening, and setting the feed properties, the feed inlet temperature range, and the cooling water boundary are as follows:

[0025] Install an electromagnetic flow meter to obtain the volumetric flow rate of cooling water;

[0026] Based on the linear fitting relationship between cooling water volumetric flow rate and circulating pump frequency, a pump-water linear fitting table is obtained.

[0027] 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.

[0028] 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.

[0029] The average specific heat capacity is obtained based on the thermophysical property data of the material within the target temperature range.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] As a preferred embodiment of the automatic protective feeding heat treatment control method of the present invention, the specific steps for generating the cooling water volumetric flow rate are as follows:

[0034] 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;

[0035] The temperature difference between the feed inlet temperature and the target feed outlet temperature is taken as the temperature reduction of the feed.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In a preferred embodiment of the automatic protective feeding heat treatment control method of the present invention, the specific steps for controlling the frequency of the circulating pump and the valve opening are as follows:

[0040] The feed outlet temperature is compared with the target feed outlet temperature to obtain the feed temperature deviation.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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;

[0046] 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.

[0047] As a preferred embodiment of the automatic protective feeding heat treatment control method of the present invention, the specific steps of the abnormality determination are as follows:

[0048] Temperature anomalies are determined at the feed inlet temperature during each sampling period;

[0049] Cooling rate limiting protection is implemented for cooling water volume flow rate in each sampling period;

[0050] Boundary protection is implemented for the cooling water inlet temperature during each sampling cycle;

[0051] 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.

[0052] 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;

[0053] 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.

[0054] If the feed inlet temperature is low, then the cooling water volume flow rate after low speed protection will be attenuated.

[0055] 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;

[0056] A negative threshold value is set based on the maximum cooling rate that the feed material can withstand;

[0057] 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.

[0058] As a preferred embodiment of the automatic protection feeding heat treatment control method of the present invention, the temperature anomaly determination includes: if the feed inlet temperature is greater than the upper limit of the feed inlet temperature, it is determined to be a high temperature condition of the feed inlet temperature.

[0059] 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;

[0060] 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.

[0061] If the feed inlet temperature is low, then the cooling water volume flow rate after low speed protection will be attenuated.

[0062] 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;

[0063] A negative threshold value is set based on the maximum cooling rate that the feed material can withstand;

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] If the cooling water inlet temperature is high and the cooling water is operating at a high temperature, the cooling capacity should be increased within the safe allowable range.

[0070] In a second aspect, the present invention provides a computer device including a memory and a processor, wherein the memory stores a computer program, wherein when the computer program is executed by the processor, it implements any step of the automatic protection feeding heat treatment control method as described in the first aspect of the present invention.

[0071] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the automatic protection feeding heat treatment control method as described in the first aspect of the present invention.

[0072] The beneficial effects of this invention are as follows: By using the drive roller to correct the linear speed and applying the correction coefficient to the theoretical linear speed to obtain the actual feed speed, the accurate quantification of the feed mass flow rate is achieved, ensuring that the heat load calculation has the engineering consistency of being collectable and substituted, and improving the real-time reliability of cooling volume prediction; by calculating the instantaneous heat load based on energy conservation and converting it into cooling water mass flow rate requirements, and simultaneously superimposing low-speed protection, cooling rate limitation and cooling water boundary protection, adaptive adjustment of cooling water volume is achieved, improving the timeliness of protection under abnormal operating conditions, and enhancing the matching degree between equipment operation safety and material tolerance. Attached Figure Description

[0073] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0074] Figure 1 A flowchart for an automatic protection feeding heat treatment control method.

[0075] Figure 2 A flowchart for obtaining the feed rate.

[0076] Figure 3 This is a flowchart for generating process temperatures.

[0077] Figure 4 A flowchart for generating cooling water volumetric flow rate. Detailed Implementation

[0078] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0079] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0080] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0081] Reference Figures 1-4 As one embodiment of the present invention, this embodiment provides an automatic protection feeding heat treatment control method, comprising the following steps:

[0082] S1. 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.

[0083] The drive roller at the front of the cooling section rotates synchronously with the feed, and pulse signals are acquired by an incremental rotary encoder installed at the end of the drive roller.

[0084] Furthermore, a drive roller is installed at the front of the cooling section, near the furnace outlet. The outer diameter of the drive roller is calibrated to obtain the diameter. The drive roller is supported on the frame by bearings, and the roller surface is coated with an anti-slip coating to ensure that there is no obvious slippage with the feeding surface. An incremental rotary encoder is rigidly connected to one end of the drive roller shaft. The incremental rotary encoder outputs a fixed number of pulses per revolution.

[0085] 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.

[0086] Furthermore, the controller collects the pulse count of the incremental rotary encoder at a fixed sampling period, records the pulse count value in each sampling period, and calculates the first rotational speed of the drive roller within the sampling period based on the fixed sampling period, the fixed number of pulses, and the pulse count value, expressed as:

[0087] ;

[0088] in, The first rotational speed of the drive roller, This represents the pulse count value within the sampling period. For a fixed number of pulses, For a fixed sampling period.

[0089] The theoretical linear velocity is obtained by utilizing the relationship between the diameter of the drive roller and the rotational speed of the drive roller.

[0090] Furthermore, using the diameter and rotational speed of the drive roller, the theoretical linear velocity of the feed is calculated and expressed as:

[0091] ;

[0092] in, This is the theoretical linear velocity of the feed. This refers to the diameter of the drive roller.

[0093] 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.

[0094] The feed rate is obtained by applying a speed correction factor to the theoretical linear velocity.

[0095] Furthermore, to eliminate minor slippage and mechanical installation errors, several standard-length feed samples were selected. A speed correction coefficient was obtained by comparing the actual time taken to pass through the cooling section with the theoretical time. This speed correction coefficient was then applied to the theoretical linear velocity of the feed to obtain the feed velocity, expressed as:

[0096] ;

[0097] in, For the feed rate, This is the speed correction factor.

[0098] An inlet temperature thermocouple is placed in the area before the feed enters the cooling section, and an outlet temperature thermocouple is placed 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.

[0099] Furthermore, in order to combine the feed rate with the process temperature to form a heat load prediction, based on the obtained feed rate, the temperatures of the feed and cooling water need to be accurately detected; the process temperature includes the feed inlet temperature, feed outlet temperature, cooling water inlet temperature, and cooling water outlet temperature.

[0100] Specifically, a sheathed K-type thermocouple is installed at a fixed distance from the feed surface at the inlet of the cooling section. The thermocouple end of the sheathed K-type thermocouple faces the direction of feed movement. The sheathed K-type thermocouple is sealed to the furnace shell through a protective sleeve. The thermocouple signal is converted by a transmitter to obtain the feed inlet temperature before cooling.

[0101] A sheathed K-type thermocouple is also installed at the outlet of the cooling section, in the same way as the inlet of the cooling section, to obtain the outlet temperature of the cooled feed.

[0102] Inlet and outlet temperature sensors are installed on the pipes where cooling water enters and exits the water-cooling jacket 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.

[0103] Furthermore, a temperature sensor is installed 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 it enters the water-cooling jacket.

[0104] Among them, the sheath-type temperature sensor can be a platinum resistance thermometer, a low-temperature thermocouple, etc.

[0105] A sleeve-type temperature sensor of the same type as that installed before the cooling water enters the water-cooling jacket is installed on the return water pipe after the cooling water leaves the water-cooling jacket to obtain the temperature of the cooling water after it enters the water-cooling jacket.

[0106] The controller substitutes each temperature into the two-point linear correction relationship to correct the temperature signal and obtain the corrected process temperature.

[0107] Furthermore, to eliminate errors in the sleeve-type temperature sensor and transmitter, the process temperature detection channel is calibrated at two points. Specifically, assuming the linear correction relationship obtained during the calibration process is as follows, it is expressed as:

[0108] ;

[0109] in, The corrected process temperature. This is the uncorrected process temperature. This is a proportional correction factor for process temperature. This is the zero-point correction factor for the process temperature.

[0110] It should be noted that the proportional correction factor and the zero-point correction factor of the process temperature are obtained from the process temperature calibration process.

[0111] The corrected process temperature is then exponentially smoothed to obtain the smoothed process temperature.

[0112] S2. 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.

[0113] Install an electromagnetic flow meter to obtain the volumetric flow rate of cooling water.

[0114] Furthermore, given the feed rate and process temperature, in order to convert the heat demand into an actionable cooling water volumetric flow rate, the cooling water volumetric flow rate needs to be measured and adjusted.

[0115] Specifically, an electromagnetic flow meter is installed on the straight pipe section before the cooling water enters the water-cooled jacket. The installation length of the electromagnetic flow meter meets the requirements of the straight pipe sections before and after it. The output signal of the electromagnetic flow meter is converted by a transmitter to obtain the volumetric flow rate of the cooling water.

[0116] The electromagnetic flowmeter is calibrated at two points to obtain the volumetric flow rate of the cooling water.

[0117] By recording the stable water output of the circulating pump at different operating frequencies through on-site testing, and based on the linear fitting relationship between the cooling water volumetric flow rate and the circulating pump frequency, a linear fitting table of the cooling water volumetric flow rate and the circulating pump frequency is generated in the controller.

[0118] Furthermore, a variable frequency controlled centrifugal circulating pump was selected as the main power source for the cooling water. The frequency of the centrifugal circulating pump's inverter was set, and the corresponding stable flow rate was measured at several different frequency points during trial operation. The flow rate was then fitted to obtain a linear fitting relationship between the cooling water volumetric flow rate and the circulating pump frequency. A pump-water linear fitting table was obtained, as shown below:

[0119] ;

[0120] in, This refers to the volumetric flow rate of the cooling water. This represents the overall flow gain coefficient of the circulating pump. This indicates the residual flow rate of the circulating pump at its lowest frequency. This refers to the frequency of the circulating pump.

[0121] It should be noted that the overall flow gain coefficient of the pump set and the residual flow rate of the pump set at the lowest frequency were determined by fitting during the trial operation.

[0122] An electric regulating valve is installed before the water-cooled jacket. By measuring the stable flow rate of the electric regulating valve at different valve openings, the proportional relationship between the valve opening and the volumetric flow rate of the cooling water is obtained.

[0123] Furthermore, an electrically operated regulating valve is installed before the cooling water enters the water-cooled jacket, allowing for adjustments to the valve opening at different degrees. While keeping the centrifugal circulating pump frequency constant, measure the corresponding cooling water volumetric flow rate, which is expressed as:

[0124] ;

[0125] in, This indicates the flow coefficient of the control valve under the current operating conditions. This indicates the valve opening degree of the electric regulating valve.

[0126] It should be noted that the flow coefficient of the regulating valve under the current operating conditions is actually obtained during the measurement process.

[0127] It should be noted that in actual operation, based on the pump-water linear fitting table, the circulation pump frequency is used for coarse flow regulation, and the valve opening is used for fine compensation.

[0128] By utilizing the cross-sectional area of ​​the feed material and the material density, and based on the conversion relationship between material volume and material mass, the feed mass per unit length can be obtained.

[0129] Furthermore, based on the existing feed rate, process temperature, and cooling water volumetric flow rate, the feed physical property parameters and process protection thresholds are quantitatively set.

[0130] Specifically, for a standard elongated feed, the cross-sectional area is denoted as... The density of the material is denoted as The mass of feed per unit length , is represented as:

[0131] ;

[0132] It should be noted that the average specific heat capacity of the feed within the target temperature range is obtained from the feed manual.

[0133] 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.

[0134] Furthermore, based on the heat treatment process requirements and the maximum allowable cooling rate of the material, the maximum residence time that the total length of the cooling section can provide is determined, and the minimum allowable feed rate is obtained, expressed as:

[0135] ;

[0136] in, The minimum allowable feed rate, This is the total length of the cooling section. This represents the maximum dwell time.

[0137] 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.

[0138] 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.

[0139] Furthermore, to prevent equipment damage or condensation caused by cooling water, the lower limit and upper limit of the cooling water inlet temperature are set according to the parameters on the cooling water machine nameplate, and the allowable temperature difference of the cooling water in the water-cooled jacket is also set.

[0140] 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 within the water-cooled jacket.

[0141] S3. Calculate the instantaneous heat load based on the feed rate and feed properties, and convert it into the cooling water mass flow rate requirement. Combine this with the low-speed constraint to generate the cooling water volume flow rate.

[0142] 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 within the current sampling cycle.

[0143] Furthermore, at each sampling time, the feed mass flow rate is calculated based on the feed rate and the mass of feed per unit length, expressed as:

[0144] ;

[0145] in, This refers to the feed mass flow rate.

[0146] It should be noted that if the feed rate is close to zero but the machine has not completely stopped, the feed mass flow rate will automatically approach zero.

[0147] The temperature difference between the feed inlet temperature and the target feed outlet temperature is taken as the percentage of the feed temperature that is reduced.

[0148] It should be noted that if the temperature reduction of the feed is less than or equal to zero, it means that the feed no longer needs to be cooled or heated, and the controller will no longer issue an instruction to increase cooling water.

[0149] 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.

[0150] Furthermore, using the feed mass flow rate, average specific heat capacity, and temperature fraction, and according to the energy conservation principle, the instantaneous heat load that needs to be removed from the feed per unit time is calculated, expressed as:

[0151] ;

[0152] in, For instantaneous heat load, The average specific heat capacity of the feed. The percentage of temperature reduction in the feed.

[0153] It should be noted that if the temperature reduction of the feed is greater than zero, the instantaneous heat load that needs to be removed from the feed per unit time is positive, indicating the amount of heat that needs to be removed from the feed; if the temperature reduction of the feed is less than or equal to zero, the instantaneous heat load that needs to be removed from the feed per unit time is zero, indicating that even if there is a subsequent cooling water volume flow rate calculation, no additional cooling demand will be generated.

[0154] 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.

[0155] Furthermore, at each sampling time, the target outlet temperature of the cooling water within the water-cooling jacket is estimated using the inlet temperature of the cooling water and the allowable temperature difference of the cooling water in the water-cooling jacket, expressed as:

[0156] ;

[0157] in, The target outlet temperature of the cooling water within the water-cooling jacket. This refers to the cooling water inlet temperature. This represents the permissible temperature difference of the cooling water within the water-cooled jacket.

[0158] Based on the specific heat capacity of the cooling water and the allowable temperature difference of the cooling water in the water-cooled jacket, the mass flow rate requirement of the cooling water is calculated using the energy balance relationship, and expressed as:

[0159] ;

[0160] in, To meet the cooling water mass flow rate requirements, The specific heat capacity of cooling water. This represents the permissible temperature difference of the cooling water within the water-cooled jacket.

[0161] It should be noted that when the instantaneous heat load that needs to be removed from the feed per unit time is greater than zero, the cooling water mass flow rate requirement is positive, corresponding to the actual water supply required; when the instantaneous heat load that needs to be removed from the feed per unit time is zero, the cooling water mass flow rate requirement is zero, indicating that there is no need to increase the water flow rate due to the current feed cooling.

[0162] Based on the cooling water mass flow rate requirement, the cooling water density and time unit are converted to obtain the cooling water volume flow rate requirement.

[0163] Furthermore, by utilizing the cooling water density, the cooling water mass flow rate requirement is converted into a cooling water volume flow rate requirement, expressed as:

[0164] ;

[0165] in, For the density of cooling water, This is the volumetric flow rate requirement for cooling water.

[0166] 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.

[0167] Furthermore, at each sampling time, the feed rate is compared with the minimum allowable feed rate. If the feed rate is less than or equal to the minimum allowable feed rate, low-speed protection is performed in the current cycle, and the heat load prediction is marked as low-speed protection condition.

[0168] To prevent excessively high water flow rates from being calculated based on normal predictions when the feed rate is low or stopped, a low-limit protection constraint is applied when calculating the target volumetric flow rate of the cooling water.

[0169] Specifically, the low-limit protection constraint means that if the low-speed protection condition is triggered, the target volumetric flow rate of the cooling water will be limited to the range of no more than the maximum safe flow rate of the cooling water in the current cycle. That is, if the cooling water volumetric flow rate demand is less than the maximum safe flow rate of the cooling water, the target volumetric flow rate of the cooling water is the cooling water volumetric flow rate; if the cooling water volumetric flow rate demand is greater than or equal to the maximum safe flow rate of the cooling water, the target volumetric flow rate of the cooling water is the maximum safe flow rate of the cooling water.

[0170] It should be noted that the maximum safety flow rate of the cooling water is set according to the equipment instruction manual.

[0171] Anti-jump constraints are applied to the changes in the target volumetric flow rate of cooling water in adjacent sampling periods.

[0172] Furthermore, to prevent excessive fluctuations in the target volumetric flow rate of cooling water during consecutive sampling cycles, which could cause excessive opening of the circulating pump and valves, anti-fluctuation constraints are applied to the target volumetric flow rate of cooling water in adjacent sampling cycles.

[0173] Specifically, the anti-jump constraint is as follows: the difference between the target volumetric flow rate of the cooling water in the previous period and the maximum allowable flow rate change in the adjacent sampling period is used as the lower limit of the anti-jump constraint; the sum of the target volumetric flow rate of the cooling water in the previous period and the maximum allowable flow rate change in the adjacent sampling period is used as the upper limit of the anti-jump constraint; if the target volumetric flow rate of the cooling water is greater than the lower limit of the anti-jump constraint and less than the upper limit of the anti-jump constraint, then no anti-jump constraint is applied; if the target volumetric flow rate of the cooling water is less than or equal to the lower limit of the anti-jump constraint, then the lower limit of the anti-jump constraint is used as the target volumetric flow rate of the cooling water in the current period; if the target volumetric flow rate of the cooling water is greater than or equal to the upper limit of the anti-jump constraint, then the upper limit of the anti-jump constraint is used as the target volumetric flow rate of the cooling water in the current period.

[0174] It should be noted that the maximum allowable flow rate change between adjacent sampling periods is usually determined by the maximum frequency change rate per unit time allowed by the inverter of the circulating pump, which is obtained based on the linear fitting relationship between the circulating pump and the cooling water.

[0175] S4. Based on the process temperature, adjust the cooling water volume flow rate according to the temperature deviation between the feed outlet and the cooling water boundary, and generate the circulation pump frequency and valve opening.

[0176] The feed outlet temperature is compared with the target feed outlet temperature to obtain the feed temperature deviation.

[0177] Furthermore, considering that the actual cooling effect may be affected by environmental factors, scaling, etc., the target volumetric flow rate of the cooling water is corrected by using the feed temperature deviation.

[0178] Specifically, the feed outlet temperature is read at each sampling time and the difference between it and the target feed outlet temperature is calculated to obtain the feed temperature deviation.

[0179] It should be noted that a feed temperature deviation greater than zero indicates insufficient cooling; a feed temperature deviation less than zero indicates excessive cooling.

[0180] The target volumetric flow rate of cooling water is corrected once by the feed temperature deviation to obtain the corrected target volumetric flow rate of cooling water.

[0181] Furthermore, the feedforward correction is expressed as:

[0182] ;

[0183] in, The corrected target volumetric flow rate of cooling water. To prevent the target volumetric flow rate of cooling water after the jump constraint, The proportional coefficient for correcting the feed temperature deviation to the target volumetric flow rate of the cooling water is determined during trial operation. This represents the deviation in feed temperature.

[0184] It should be noted that, The unit is .

[0185] It should be noted that when the feed temperature deviation is greater than zero, the corrected target volumetric flow rate of cooling water is greater than that of cooling water after anti-jump constraint, thereby enhancing cooling; when the feed temperature deviation is less than zero, the corrected target volumetric flow rate of cooling water is reduced, thus weakening cooling.

[0186] 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.

[0187] Furthermore, to prevent the corrected target volumetric flow rate of cooling water from becoming negative or exceeding the equipment's upper limit, physical constraints are imposed on the corrected target volumetric flow rate of cooling water.

[0188] Specifically, regarding physical constraints, if the corrected target volumetric flow rate of the cooling water is greater than the minimum security flow rate of the cooling water but less than the maximum design flow rate of the circulating water, then the corrected target volumetric flow rate of the cooling water will be used as the reference volumetric flow rate; if the corrected target volumetric flow rate of the cooling water is less than or equal to the minimum security flow rate of the cooling water, then the minimum security flow rate of the cooling water will be used as the reference volumetric flow rate; if the corrected target volumetric flow rate of the cooling water is greater than or equal to the maximum design flow rate of the circulating water, then the maximum design flow rate of the circulating water will be used as the reference volumetric flow rate.

[0189] It should be noted that the minimum safety flow rate of cooling water and the maximum design flow rate of the circulating water system are determined by the equipment design.

[0190] 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.

[0191] Furthermore, based on the linear fitting relationship between cooling water volumetric flow rate and circulating pump frequency, the reference volumetric flow rate is back-calculated at each sampling time to obtain the initial value of the circulating pump frequency.

[0192] 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.

[0193] Furthermore, to ensure that the circulating pump operates within a safe operating range, the initial value of the circulating pump frequency is limited to the allowable range through a circulating pump frequency limit constraint.

[0194] Specifically, the circulation pump frequency limit constraint is as follows: if the initial value of the circulation pump frequency is greater than the minimum allowable operating frequency of the circulation pump and less than the maximum allowable operating frequency of the circulation pump, then the initial value of the circulation pump frequency is used as the circulation pump frequency setting value; if the initial value of the circulation pump frequency is less than or equal to the minimum allowable operating frequency of the circulation pump, then the minimum allowable operating frequency of the circulation pump is used as the circulation pump frequency setting value; if the initial value of the circulation pump frequency is greater than or equal to the maximum allowable operating frequency of the circulation pump, then the maximum allowable operating frequency of the circulation pump is used as the circulation pump frequency setting value.

[0195] Read the cooling water volumetric flow rate from the electromagnetic flow meter, and obtain the valve opening based on the cooling water volumetric flow rate and the reference volumetric flow rate.

[0196] Furthermore, at each sampling moment, the cooling water volumetric flow rate at that moment is read by an electromagnetic flow meter, and the difference between the volumetric flow rate and the reference volumetric flow rate is calculated to determine the cooling water volumetric flow rate deviation.

[0197] The new valve opening is obtained by adding the cooling water volume flow rate deviation to the valve opening of the previous cycle.

[0198] It should be noted that when the cooling water volume flow rate deviation is greater than zero, the valve opening increases; when the cooling water volume flow rate deviation is less than zero, the valve opening decreases.

[0199] 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.

[0200] Furthermore, the maximum heat load designed for the cooling water equipment is set, and the relative coefficient of the heat load is calculated using the instantaneous heat load obtained at each sampling time, expressed as:

[0201] ;

[0202] in, The relative coefficient of heat load, This represents the maximum heat load.

[0203] It should be noted that if the relative coefficient of heat load is greater than 1, the relative coefficient of heat load is truncated to 1; if the relative coefficient of heat load is less than 1, the relative coefficient of heat load is set to 0.

[0204] The upper and lower limits of the coolant outlet water temperature are set based on the relative coefficient of heat load, and the current coolant outlet water temperature set value is obtained by linear interpolation.

[0205] The current outlet water temperature setpoint of the cooling water machine is sent to the cooling water machine as the outlet water temperature target. The cooling water machine tracks the outlet water temperature according to its own control logic, thereby completing the joint control of two variables, flow rate and water temperature, at the equipment level.

[0206] S5. During the sampling period, perform anomaly detection on the feed inlet temperature, cooling water volume flow rate, cooling rate, and cooling water temperature, and perform heat treatment control based on the anomaly detection.

[0207] Determine abnormal temperatures at the feed inlet.

[0208] Furthermore, considering situations where the feed temperature is abnormally high or low, cooling intensity and alarm linkage protection are implemented when the feed temperature is abnormal.

[0209] Specifically, at the sampling time, the smoothed feed inlet temperature is read, and based on the set upper limit and lower limit of the feed inlet temperature, it is determined whether there is a temperature anomaly.

[0210] Specifically, the criteria for determining temperature anomalies are as follows: B1-B3:

[0211] B1: If the feed inlet temperature is greater than the upper limit of the feed inlet temperature, it is determined to be a high temperature condition at the feed inlet.

[0212] B2: 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.

[0213] 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 to be a normal operating condition for the feed inlet temperature.

[0214] 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.

[0215] Furthermore, for cases where the feed inlet temperature is too high, moderately enhanced cooling is permitted while ensuring equipment safety, but it cannot be increased indefinitely. Therefore, a temperature upper limit correction is applied to the flow rate after low-speed protection.

[0216] Specifically, applying the upper limit temperature correction to the flow rate after low-speed protection involves comparing the feed inlet temperature with the maximum allowable value of the feed inlet temperature after low-speed protection is applied to the feed rate and the corresponding cooling water volume flow rate is obtained. When the feed inlet temperature is higher than the maximum allowable value of the feed inlet temperature, the excess temperature is used as the driving amount to increase the cooling water volume flow rate.

[0217] At the same time, a high-temperature alarm signal is triggered, prompting the operator to check the furnace temperature or feeding status.

[0218] If the feed inlet temperature is too low, the volumetric flow rate of the cooling water after low-speed protection will be reduced.

[0219] Furthermore, for operating conditions where the feed inlet temperature is too low, avoid further significant cooling of the already low-temperature feed and apply a reduction to the flow rate after low-speed protection.

[0220] Specifically, the attenuation of the flow rate after low-speed protection is applied by comparing the feed inlet temperature with the minimum allowable value of the feed inlet temperature after the feed speed is protected against low speed and the corresponding cooling water volume flow rate is obtained. When the feed inlet temperature is lower than the minimum allowable value of the feed inlet temperature, the amount by which the feed inlet temperature is lower than the minimum allowable value of the feed inlet temperature is used as the attenuation basis to reduce the cooling water volume flow rate.

[0221] Based on the change in cooling water volumetric flow rate, the circulation pump frequency and valve opening are re-matched and constrained.

[0222] Furthermore, in response to changes in cooling water volumetric flow rate, the circulation pump frequency and valve opening need to be reconstrained to match the circulation pump frequency and valve opening with the cooling water volumetric flow rate.

[0223] Specifically, the rematching constraint is as follows: based on the pump-water linear fitting table, the circulation pump frequency under temperature anomaly protection is calculated, and the circulation pump frequency is limited to the minimum and maximum allowable operating frequencies of the circulation pump; then, based on the flow deviation before and after the change in cooling water volume flow rate, the valve opening is updated according to the proportional relationship between the valve opening and the cooling water volume flow rate.

[0224] Cooling rate limiting protection is implemented for the volumetric flow rate of cooling water.

[0225] Furthermore, even when the feeding rate and inlet temperature are normal, there is still a risk that the feed material may crack due to an excessively rapid drop in outlet temperature. Therefore, it is necessary to monitor and limit the cooling rate.

[0226] Specifically, the cooling rate limiting protection involves calculating the discrete rate of change of the feed temperature at each sampling time using the smoothed feed outlet temperature and the smoothed feed outlet temperature at the previous sampling time, expressed as:

[0227] ;

[0228] in, This represents the rate of change of feed temperature. The feed outlet temperature after smoothing. This represents the smoothed feed outlet temperature from the previous sampling time. The sampling interval is denoted as .

[0229] A negative threshold is set based on the maximum cooling rate that the feed material can withstand, and the value range is usually [-5, -1].

[0230] It should be noted that if the negative threshold value is too large, it will lead to excessively rapid cooling, causing a sudden drop in the surface temperature of the feed material and resulting in cracks; if the negative threshold value is too small, it will lead to insufficient cooling, causing the feed product to fail to meet the required standards, and will also frequently trigger false protection, reducing efficiency.

[0231] When the rate of change of feed temperature is less than the negative threshold, it indicates that the cooling rate is too fast and the cooling intensity needs to be reduced. Based on feedforward correction, the target volumetric flow rate of cooling water is limited, as expressed as:

[0232] ;

[0233] in, To account for the target volumetric flow rate of cooling water after cooling rate protection, To take into account the target volumetric flow rate of cooling water before cooling rate protection, The threshold value is negative.

[0234] Boundary protection is provided for the cooling water inlet temperature.

[0235] Furthermore, excessively cold cooling water may cause condensation, thermal shock, or even surface cracks in the equipment, necessitating boundary protection for the cooling water inlet temperature.

[0236] Specifically, the boundary protection involves 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 lower 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 higher than the upper limit of the cooling water inlet temperature, the cooling water is determined to be in a high water temperature condition.

[0237] If the cooling water inlet temperature is low, in order to prevent cold shock to the feed and equipment, the target volumetric flow rate of the cooling water is reduced and the outlet water temperature setting of the cooling water machine is increased.

[0238] If the cooling water inlet temperature is high, the cooling effect may be affected. Within the safe allowable range, the cooling effect should be enhanced.

[0239] Furthermore, to avoid a situation where once protection is entered, it cannot be exited, the protection status is remembered and restored.

[0240] Specifically, a protection status variable is defined. When the protection status variable takes a value of 0, it indicates normal mode; when the protection status variable takes a value of 1, it indicates protection mode.

[0241] At each sampling time, if any of the following conditions are met: triggering low-speed protection, triggering abnormal feed inlet temperature, triggering cooling rate limit protection, or triggering cooling water inlet temperature boundary protection, the protection status variable will be set to 1.

[0242] Once the protection status variable is set to 1, the protected cooling water volume flow rate, valve opening, and circulating pump frequency will be used as the execution parameters in the current and subsequent sampling periods, and a protection mode prompt will be displayed on the operator interface.

[0243] If the current operating condition is determined to have returned to normal, a counter is defined. If the sampling period simultaneously meets the conditions that the low-speed protection condition is not triggered, the feed inlet temperature 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 incremented by 1. Otherwise, the normal operating condition is reset to 0.

[0244] Set a minimum number of normal cycles, such as 30 sampling cycles. When the counter value is greater than or equal to the minimum number of normal cycles, the operating condition is considered to have stabilized and returned to normal, and the protection status variable is set to 0.

[0245] This embodiment also provides a computer device applicable to the automatic protection feeding heat treatment control method, including: 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 implement the automatic protection feeding heat treatment control method proposed in the above embodiment.

[0246] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0247] This embodiment also provides a storage medium storing a computer program, which, when executed by a processor, implements the automatic protection feeding heat treatment control method proposed in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0248] In summary, this invention achieves accurate quantification of feed mass flow rate by using the drive roller to correct the linear velocity and applying the correction coefficient to the theoretical linear velocity to obtain the actual feed velocity. This ensures that the heat load calculation has collectable and substituted engineering consistency, improving the real-time reliability of cooling volume prediction. By calculating the instantaneous heat load based on energy conservation and converting it into cooling water mass flow rate requirements, while superimposing low-speed protection, cooling rate limitation, and cooling water boundary protection, adaptive adjustment of cooling water volume is achieved, improving the timeliness of protection under abnormal operating conditions and enhancing the matching degree between equipment operation safety and material tolerance.

[0249] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automatic protection feed heat treatment control method characterized by: The method comprises the following steps: The linear speed is corrected by the driving roller 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; The cooling water volume flow is obtained, and the corresponding relationship between the circulating pump frequency and the valve opening is established, the feed material property, the feed inlet temperature range and the cooling water boundary are set; The instantaneous heat load is calculated according to the feed speed and the feed material property, and the cooling water mass flow demand is converted, the cooling water volume flow is generated in combination with the low-speed constraint; Based on the process temperature, the cooling water volume flow is corrected according to the feed outlet temperature deviation and subjected to the cooling water boundary limitation to generate the circulating pump frequency and the valve opening; The abnormality judgment is performed on the feed inlet temperature, the cooling water volume flow cooling rate and the cooling water temperature in the sampling period, and the heat treatment control is performed based on the abnormality judgment; The driving roller is synchronized with the feed to rotate in the front section of the cooling section, and the pulse signal is obtained through the incremental rotary encoder installed at the end of the driving roller; The number of pulse signals is counted by the controller in the fixed sampling period, and the rotating speed of the driving roller is obtained 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 rotating speed of the driving roller; The speed correction coefficient is generated by using the ratio of the actual passing time to the theoretical passing time of the standard length feed sample measured by the controller; The feed speed is obtained by applying the speed correction coefficient to the theoretical linear speed; The temperature abnormality judgment is performed on the feed inlet temperature in each sampling period; The cooling rate limitation protection is performed on the cooling water volume flow in each sampling period; The boundary protection is performed on the cooling water inlet temperature in each sampling period.

2. The automatic protection feed thermal process control method of claim 1 wherein: The process temperature is generated in the following specific steps: The inlet temperature thermocouple is arranged in the area before the feed enters the cooling section, and the 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; The inlet and outlet temperature sensors are arranged in the pipelines where the cooling water enters and leaves the water-cooled jacket respectively 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 the two-point linear correction relationship to correct the temperature signal and obtain the corrected process temperature; The corrected process temperature is subjected to exponential smoothing processing to obtain the smoothed process temperature; The process temperature comprises the feed inlet temperature, the feed outlet temperature, the cooling water inlet temperature and the cooling water outlet temperature.

3. The automatic protection feed thermal process control method of claim 2 wherein: The cooling water volume flow is obtained, and the corresponding relationship between the circulating pump frequency and the valve opening is established, the feed material property, the feed inlet temperature range and the cooling water boundary are set in the following specific steps: The electromagnetic flowmeter is installed to obtain the cooling water volume flow; The pump water linear fitting table is obtained according to the linear fitting relationship between the cooling water volume flow and the circulating pump frequency; The electric regulating valve is installed before the water-cooled 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 unit length of the feed mass is obtained according to the conversion relationship between the material volume and the material mass by using the cross-sectional area of the feed and the material density; The average specific heat capacity is obtained based on the thermal physical data within the target temperature interval of the material; 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; The outlet target temperature of the cooling section is set according to the organizational performance requirements of the product design, and the inlet temperature range of the feed is taken as the upper limit and the lower limit of the feed inlet temperature; The minimum and maximum inlet temperatures of the cooling water are set according to the cooling water machine capacity, and the allowable temperature difference of the cooling water in the water-cooled jacket is set.

4. The automatic protection feed thermal process control method of claim 3 wherein: The specific steps for generating the cooling water volume flow are as follows: The feed mass flow entering the cooling section in the current sampling period is obtained by combining the feed speed and the unit length mass in each sampling period; The temperature difference between the feed inlet temperature and the feed target outlet temperature is taken as the temperature fraction of the feed reduced; The instantaneous heat load required to be taken away from the feed per unit time is calculated according to the energy conservation principle based on the feed mass flow, the average specific heat capacity of the feed, and the temperature fraction of the feed reduced; Based on the instantaneous heat load, the cooling water mass flow demand is obtained based on the specific heat capacity of the cooling water and the allowable temperature difference in the water-cooled jacket. Low-speed protection condition judgment is performed 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.

5. The automatic protection feed thermal process control method of claim 4 wherein: The specific steps for generating the circulating pump frequency and the valve opening degree are as follows: The feed outlet temperature is compared with the feed target outlet temperature to obtain the feed temperature deviation; The cooling water target volume flow is once fed back and corrected according to the feed temperature deviation to obtain the corrected cooling water target volume flow; The boundary comparison is performed on the corrected cooling water target volume flow, the minimum safety flow of the cooling water, and the maximum design flow of the circulating water to make the reference volume flow fall within the limit range; The circulating pump frequency initial value is obtained by using the pump water linear fitting table and through the reverse calculation of the table lookup; The circulating pump frequency initial value is limited in the allowable range based on the circulating pump frequency limit constraint to obtain the circulating pump frequency set value; The cooling water volume flow of the electromagnetic flowmeter is read, and the valve opening degree is obtained according to the cooling water volume flow and the 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 an adjustment factor to make the cooling water machine outlet water temperature interpolate between the maximum allowable value and the minimum allowable value to obtain the outlet water temperature setting.

6. The automatic protection feed thermal process control method of claim 5 wherein: The temperature abnormality judgment includes that if the feed inlet temperature is greater than the upper limit of the feed inlet temperature, it is judged as the high temperature condition of the feed inlet temperature; If the feed inlet temperature is less than the lower limit of the feed inlet temperature, it is judged as the low temperature condition of the feed inlet temperature; If the feed inlet temperature is the high temperature 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 condition of the feed inlet temperature, the attenuation is applied to the cooling water volume flow after the low-speed protection. The cooling rate limit protection comprises calculating the discrete form of the feed temperature change rate by using the smoothed feed outlet temperature and the last sampling time smoothed feed outlet temperature at each 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 cooling water target volume flow is limited based on the feedforward 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 the low water temperature condition of the cooling water, the cooling water target volume flow is reduced and the outlet water temperature set value of the cooling water machine is increased; If the cooling water inlet temperature is in the high water temperature condition of the cooling water, the refrigeration is enhanced within the safety allowable range. 7.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is characterized in that: The processor executes the computer program to realize the steps of the automatic protection feed heat treatment control method of any one of claims 1-6.

8. A computer readable storage medium having stored thereon a computer program, characterized in that: The computer program is executed by the processor to realize the steps of the automatic protection feed heat treatment control method of any one of claims 1-6.

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