A temperature control method, device and equipment of a heating roller and a storage medium

Abstract

The application relates to the technical field of industrial heating rollers, and discloses a temperature control method, device and equipment of a heating roller and a storage medium, which comprises the following steps: calculating the state change of a heat-conducting medium under a target working condition according to a heating roller operation parameter, and determining a heating control parameter; injecting the heat-conducting medium into a heating roller inner cavity according to the parameter to establish a heat transfer channel, and generating heating state data. The heating assembly is segmented along the roller body axis, and a mapping relationship between each segment and a roller surface temperature measuring point is established; heating power is applied to each heating segment according to the roller body mapping relationship, and the data of the temperature measuring point is collected to form an evaluation result. The heating power of each heating segment is dynamically adjusted based on the evaluation result until the roller surface temperature difference meets the preset uniformity requirement. The application significantly improves the consistency and stability of the roller surface temperature distribution, improves the compactness and uniformity of the pole piece during the rolling process, effectively improves the energy density and cycle life of the battery pole piece, and enhances the reliability and controllability of the process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial heating roller, and in particular to a temperature control method, device and equipment of a heating roller and a storage medium. BACKGROUND

[0002] As an important part of new energy industry, the performance and safety of lithium ion batteries directly determine the service life and application range of the batteries. In the manufacturing process, the electrode sheet rolling is one of the core links, which densifies the electrode sheet material by applying pressure, thereby improving the energy density and cycle life. As a key means, the heat roller rolling technology can further improve the microstructure and interface bonding performance of the electrode sheet through temperature control of the heating roller, thereby significantly improving the electrochemical performance. The existing electric heating roller generally inserts a heating rod assembly 10 into the center hole of the roller shaft to transfer heat to the roller body 20, as shown in Figure 1 .

[0003] Although the existing electric heating scheme promotes the development of heat roller rolling, there are still outstanding problems. On the one hand, due to the natural convection heat dissipation formed by the shaft necks on both sides of the roller shaft and the air, the temperatures on both sides of the roller surface 30 (heat dissipation surface 31, heat dissipation surface 32) are low, and the overall temperature difference is large (as shown in Figure 2 ), which makes it difficult to maintain uniform temperature distribution on the roller surface. On the other hand, there is often an assembly gap or poor contact between the heating rod assembly 10 and the roller shaft, as shown in Figure 3 region A and region B, and as shown in the enlarged local regions A and B in Figure 4 , at this time, heat is only transferred through heat conduction at the solid contact site 40, and the air gap region 50 relies on natural convection heat transfer. The difference in thermal conductivity between metal and air is significant (copper is about 385 W / m·K, aluminum is about 237 W / m·K, steel is about 50 W / m·K, and air is only 0.02~0.03 W / m·K), which leads to local temperature being too high and overall heat transfer being uneven. With the improvement of industrialization scale, the electrode sheet rolling puts forward higher requirements for the uniformity of the roller surface temperature and the control precision, and the existing electric heating scheme cannot meet the needs of high energy density and high safety batteries. SUMMARY

[0004] Therefore, the embodiments of the present application provide a temperature control method, device, equipment and storage medium of a heating roller, which can effectively solve the technical problems of the existing electric heating roller in terms of uneven heat transfer, poor temperature consistency, low control precision and insufficient stability of the sealing structure.

[0005] In a first aspect, the embodiments of the present application provide a temperature control method of a heating roller, comprising:

[0006] calculating the running state change of the heat conducting medium under the target working condition according to the running parameters of the heating roller, and determining the heating control parameters;

[0007] injecting the heat-conducting medium into the inner cavity of the heating roller according to the heating control parameter, establishing a heat-conducting medium heat transfer path between the heating assembly and the roller body of the heating roller, and generating initial heating state data;

[0008] based on the heating state data, segmenting the heating assembly along the roller body axis of the heating roller, and obtaining a mapping relationship between the roller surface temperature measuring point and each heating segment;

[0009] According to the mapping relationship, an initial heating power is applied to each heating segment, and temperature data of each temperature measuring point is collected to form temperature difference evaluation data;

[0010] Based on the temperature difference evaluation data, the heating power of each heating segment is adjusted until the temperature difference of the heating roller surface meets the preset condition.

[0011] In some embodiments, the heating control parameter is determined according to the operating parameters of the heating roller in the target working condition, including:

[0012] Obtaining the total volume of the inner cavity of the heating roller, the volume expansion coefficient, the initial temperature, the target temperature, the initial pressure and the allowable pressure difference of the sealing member, and constructing an operating parameter set;

[0013] Based on the operating parameter set, the volume change amount of the heat-conducting medium at the target temperature is calculated to obtain the liquid volume and gas volume data after heating;

[0014] According to the liquid volume and gas volume data, and the ideal gas state equation, the inner cavity pressure after heating is calculated and compared with the initial pressure to obtain pressure change data;

[0015] Based on the volume change amount and the pressure change data, the maximum injection ratio of the heat-conducting medium is determined, and the maximum injection ratio is combined with the operating parameters to generate the heating control parameter.

[0016] In some embodiments, the heating control parameter is determined according to the operating parameters of the heating roller in the target working condition, including:

[0017] Based on the heating control parameter, injection configuration data is generated, and the injection configuration data at least includes a target injection ratio and corresponding gas phase space parameters;

[0018] According to the injection configuration data, injection and sealing are performed to form a heat-conducting medium heat transfer path, and corresponding path establishment identification data is generated;

[0019] Correlating the liquid injection configuration data with the passage establishment identification data generates the initial heating state data.

[0020] In some embodiments, based on the heating state data, the heating assembly is segmented along the roller body axis of the heating roller, and a mapping relationship between the roller surface temperature measuring points and each heating segment is obtained, including:

[0021] Based on the heating state data, a segmentation reference along the roller body axis of the heating roller is established to obtain segmentation information of the heating assembly;

[0022] Based on the segmentation information, temperature measuring point positions are determined at both ends and the middle of the roller surface to obtain measuring point information;

[0023] The segmentation information and the measuring point information are positionally corresponding to generate segmented heating mapping data.

[0024] In some embodiments, according to the mapping relationship, initial heating power is applied to each heating segment and temperature data of each temperature measuring point is collected to form temperature difference evaluation data, including:

[0025] According to the segmented heating mapping data, initial heating power setting data of each heating segment is generated;

[0026] Based on the initial heating power setting data, each heating segment is driven to perform heating, and temperature data of each temperature measuring point is obtained according to a preset collection period to obtain a temperature vector;

[0027] Based on the segmented heating mapping data, the temperature vector is associated with the corresponding heating segment, and an axial temperature difference vector is calculated to form temperature difference evaluation data.

[0028] In some embodiments, based on the temperature difference evaluation data, the heating power of each heating segment is adjusted until the temperature difference of the heating roller surface meets a preset condition, including:

[0029] According to the temperature difference evaluation data, power adjustment instructions for each heating segment are generated;

[0030] According to the power adjustment instructions, the power setting data of each heating segment is updated to form a current power setting state;

[0031] Based on the current power setting state, each heating segment is driven to perform heating, and temperature data of each temperature measuring point is obtained according to a preset collection period to obtain a new round of temperature vector;

[0032] The new round of temperature vector and the corresponding relationship of each heating segment are matched to calculate the corresponding axial temperature difference vector to obtain new temperature difference evaluation data;

[0033] The new temperature difference evaluation data is compared with preset temperature difference conditions, and if the preset conditions are not met, power adjustment, temperature collection and temperature difference evaluation are continued based on the new temperature difference evaluation data until the preset conditions are met.

[0034] In some embodiments, the method further comprises:

[0035] The power setting state, temperature vector and temperature difference evaluation data of each round are recorded to form a temperature control process log.

[0036] In a second aspect, the embodiments of the present application provide a temperature control device of a heating roller, comprising:

[0037] A parameter determination module is configured to calculate the operating state change of the heat conducting medium under the target working condition according to the operating parameters of the heating roller, and determine heating control parameters;

[0038] A data generation module is configured to inject the heat conducting medium into the inner cavity of the heating roller according to the heating control parameters, establish a heat conducting medium heat transfer path between the heating assembly and the roller body of the heating roller, and generate initial heating state data;

[0039] A mapping module is configured to segment the heating assembly along the roller body axis of the heating roller based on the heating state data, and obtain the mapping relationship between the roller surface temperature measuring point and each heating segment;

[0040] A collection module is configured to apply initial heating power to each heating segment according to the mapping relationship and collect temperature data of each temperature measuring point to form temperature difference evaluation data;

[0041] An adjustment module is configured to adjust the heating power of each heating segment based on the temperature difference evaluation data until the temperature difference of the heating roller surface meets the preset conditions.

[0042] In a third aspect, the embodiments of the present application provide a rolling device, comprising a processor and a memory, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the temperature control method of the heating roller of the first aspect.

[0043] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, wherein the computer program is executed on a processor to implement the temperature control method of the heating roller of the first aspect.

[0044] The embodiments of the present application have the following beneficial effects: according to the operating parameters of the heating roller, the operating state change of the heat-conducting medium under the target working condition is calculated, and the corresponding heating control parameter is determined; then the heat-conducting medium is injected into the inner cavity of the heating roller according to the heating control parameter, the heat transfer path between the heating assembly and the roller body is established, and the initial heating state data is generated; on this basis, the heating assembly is segmented along the roller body axis, and the mapping relationship between the roller surface temperature measuring point and each heating section is obtained; then the initial heating power is applied to each heating section, and the temperature data of the roller surface temperature measuring point is collected to form the temperature difference evaluation data; finally, the power of each heating section is adjusted according to the temperature difference evaluation data until the roller surface temperature difference meets the preset condition. The present application can effectively improve the problem of uneven roller surface temperature distribution, so that the temperature of each heating section is accurately regulated, thereby ensuring that the overall roller surface temperature difference is in the ideal range. This method not only improves the temperature uniformity and temperature control accuracy of the heating roller, but also avoids the uneven compaction of the pole piece and the performance fluctuation caused by the excessive temperature difference, significantly enhances the stability and consistency of the pole piece rolling process, and provides reliable protection for large-scale production and high-performance application of lithium ion batteries. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0046] Figure 1 The temperature control method of the heating roller of the embodiments of the present application is shown- the schematic diagram of the existing electric heating roller scheme in the background technology;

[0047] Figure 2 The temperature control method of the heating roller of the embodiments of the present application is shown- the schematic diagram of the roller shaft neck heat dissipation in the background technology;

[0048] Figure 3 The temperature control method of the heating roller of the embodiments of the present application is shown- the schematic diagram of the heating rod contacting the roller shaft in the background technology;

[0049] Figure 4 The temperature control method of the heating roller of the embodiments of the present application is shown- another schematic diagram of the heating rod contacting the roller shaft in the background technology;

[0050] Figure 5 The schematic diagram of the heating roller in the temperature control method of the heating roller of the embodiments of the present application is shown;

[0051] Figure 6 A flowchart of the temperature control method of the heating roller of the embodiments of the present application is shown;

[0052] Figure 7 Another flow chart in the temperature control method of the heating roller according to the embodiment of the present application is shown.

[0053] Figure 8 Another flow chart in the temperature control method of the heating roller according to the embodiment of the present application is shown.

[0054] Figure 9 A structural schematic diagram in the temperature control method of the heating roller according to the embodiment of the present application is shown.

[0055] Main component symbol explanation: 10: heating rod assembly; 11: heating section A; 12: heating section B; 13: heating section C; 20: roller body; 30: roller surface; 31: heat dissipation surface 1; 32: heat dissipation surface 2; 40: solid contact part; 50: air gap area; 60: roller surface measuring point A; 61: roller surface measuring point B; 62: roller surface measuring point C; 70: heating section measuring point A; 71: heating section measuring point B; 72: heating section measuring point C; 80: heating rod fixing part; 90: heat-conducting liquid; 100: fixing pin; 110: horizontal bar. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0057] The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0058] In the following, the terms "comprise", "have", and their synonymous words used in various embodiments of the present application are only intended to represent a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be understood as first excluding the existence or possibility of adding one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0059] Unless specifically defined otherwise herein, all terms (including technical and scientific terms) used herein are to be interpreted according to their ordinary meaning in the technical field of the various embodiments of the present application. The terms "comprising", "comprise" and "when comprising" when used in this specification are not to be interpreted in an excluding sense, i.e. they do not exclude other elements or steps.

[0060] Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments described below can be combined with each other unless otherwise conflicting.

[0061] In view of the technical problems of uneven heat transfer, poor temperature consistency, low temperature control precision and insufficient stability of the sealing structure of the existing electric heating roller, the present application proposes a temperature control method of a heating roller. The method calculates the running state change of the heat conduction medium under the target working condition by combining the operating parameters and determines the heating control parameters. Then, a stable heat conduction path is established in the roller body cavity according to the parameters, so as to realize the accurate construction of the initial heating state. Then, the heating assembly is controlled in segments along the axial direction of the roller body, and the mapping relationship of the roller surface temperature measuring points is combined to implement the partition heating and real-time data acquisition. Finally, the power of each heating section is dynamically adjusted on the basis of the temperature difference evaluation, so that the roller surface temperature distribution meets the preset uniformity requirement. Therefore, the method not only effectively improves the heat transfer efficiency and temperature control precision, but also enhances the adaptability and stability of the sealing structure, and provides a reliable temperature control means for the lithium electrode sheet rolling process.

[0062] As Figure 5As shown, the heating roller provided by the embodiment of the present application comprises a roller body 20, a heating rod assembly 10, and a heat-conducting liquid 90 filled between the two. The heating rod assembly 10 is arranged inside the roller body 20, and the heating rod assembly 10 is composed of a heating section A-11, a heating section B-12, a heating section C-13, and a heating rod fixing piece 80. The heating section A-11, the heating section B-12, and the heating section C-13 are respectively provided with a heating section measuring point A-70, a heating section measuring point B-71, and a heating section measuring point C-72. The heating rod assembly 10 is fixed with external components through a fixing pin 100, so that the heating rod assembly 10 remains in a stationary state during the rotation of the roller shaft. The heating rod assembly 10 appears as a plurality of horizontal strips 110 in the cross section. These horizontal strips 110 form agitation relative to the internal heat-conducting liquid 90 during the rotation of the roller shaft, thereby generating a rotational agitation effect on the heat-conducting liquid 90 (also referred to as a heat-conducting medium or a liquid medium). In other words, in order to avoid the uneven heat transfer phenomenon caused by the direct contact between the heating rod assembly 10 and the roller body 20, the embodiment fills the heat-conducting liquid 90 between the heating rod assembly 10 and the roller body 20, so that the heat conduction process is transmitted to the roller body 20 through the heat-conducting liquid 90, thereby improving the overall heat transfer uniformity. That is, since the roller shaft is in a continuous rotation state during the heating process, combined with the agitation effect of the horizontal strips 110 on the heating rod assembly 10, the heat-conducting liquid 90 forms forced convection in the roller cavity, which can quickly absorb the heat generated by the heating rod and efficiently conduct the heat to the roller body 20, thereby achieving uniform heating. In addition, the roller surface 30 is respectively provided with a roller surface measuring point A-60, a roller surface measuring point B-61, and a roller surface measuring point C-62.

[0063] The heat-conducting liquid is preferably heat-conducting oil, which can use the Mobil 600 heat-conducting oil series product. The boiling point of the heat-conducting oil is greater than 315.56℃, the flash point is greater than 294℃, the pour point is -6℃, and the recommended working temperature in a closed system can reach 315℃. Compared with air medium, the thermal conductivity of such heat-conducting oil is usually 4 to 5 times higher, which can significantly improve the conduction efficiency of heat in the roller body. At the same time, since the boiling point of the heat-conducting oil is usually higher than 300℃, and the common working condition temperature range of lithium electrode sheet rolling is 100℃ to 150℃, which is far lower than the boiling point of the heat-conducting oil, therefore, in actual work, there is no risk of internal pressure rising caused by medium evaporation, thereby ensuring the stability and safety of the heating roller system. Through the above structural design, the convection heat exchange effect of the heat-conducting oil in the roller cavity not only enhances the uniformity of heat transfer, but also avoids the temperature difference problem caused by inconsistent contact in the traditional direct heating method. In this way, the heating roller can maintain the balanced distribution of the roller surface temperature during the operation process, thereby providing a stable and reliable physical basis for the temperature detection and power regulation in the subsequent method steps.

[0064] The temperature control method of the heating roller will be described below in combination with some specific embodiments.

[0065] Figure 6A flow chart of the temperature control method of the heating roller according to an embodiment of the present application is shown. Exemplarily, the temperature control method of the heating roller comprises the following steps:

[0066] In step S100, the operating state change of the heat conducting medium under the target working condition is calculated according to the operating parameters of the heating roller, and the heating control parameters are determined.

[0067] The operating parameters refer to the boundary conditions of the heating roller under a specific working condition, including the internal cavity volume, medium properties, initial environmental parameters and sealing performance information; the heating control parameters refer to the filling ratio and pressure constraint of the heat conducting medium calculated in combination with the operating parameters, which are used to guide the heating process.

[0068] Exemplarily, the volume change and cavity pressure difference of the heat conducting oil during the heating process are calculated by determining the internal cavity geometric volume, the thermal expansion coefficient of the heat conducting medium (heat conducting oil), the assembly temperature and the target working condition temperature, and in combination with the allowable pressure difference of the sealing element, and the constraint condition of the maximum injection ratio a is obtained accordingly. For example, when the iron material roller shaft is assembled at 25°C and the target temperature is raised to 125°C, it is necessary to ensure that the injection ratio a is less than 92.9% to ensure that the internal cavity pressure difference after heating does not exceed 1.5 MPa.

[0069] In an alternative embodiment, step S100 comprises the following sub-steps:

[0070] S101, obtaining the total volume of the internal cavity of the heating roller, the volume expansion coefficient of the heat conducting medium, the initial temperature, the target temperature, the initial pressure and the allowable pressure difference of the sealing element, and constructing the operating parameter set.

[0071] The total volume V of the internal cavity refers to the available volume of the internal cavity of the roller body after the assembly of the heating rod assembly; the volume expansion coefficient γ refers to the relative increase of the volume of the liquid per unit temperature rise; the initial temperature: ; the target temperature ; the initial pressure ; the pressure after heating ; the allowable pressure difference of the sealing element refers to the maximum internal and external pressure difference that the sealing material can withstand. Exemplarily, when the roller body is made of iron material, the thermal expansion effect can be ignored, and if the volume expansion coefficient of the heat conducting oil , the assembly is at room temperature 25°C, the target temperature is 125°C, the atmospheric pressure is , and the allowable pressure difference of the sealing element is , the operating parameter set formed includes the internal cavity volume V, the physical properties of the heat conducting liquid , the initial temperature , the target temperature , the initial pressure , and the allowable pressure difference .

[0072] S102, calculate the volume change of the heat conducting medium at the target temperature based on the set of operating parameters, to obtain the liquid volume and gas volume data after heating.

[0073] Wherein, the liquid volume refers to the volume occupied by the heat oil at different temperatures; the gas volume refers to the remaining volume of the inert gas in the cavity. Exemplarily, at the initial temperature T1=25℃, the liquid volume V o1 =αV, and the gas volume V a1 =(1-α)V;

[0074] Wherein: V o1 is the liquid volume, V a1 is the gas volume, and 1-α is the proportion of inert gas;

[0075] When heated to the target temperature T2=125℃, the liquid volume V o2 =[ (T2-T1)+1]αV, and the gas volume V a2 =V-[ (T2-T1)+1]αV;

[0076] Wherein: (T2-T1) represents the relative volume growth rate of the liquid; +1 is because the original volume is also added.

[0077] S103, calculate the internal cavity pressure after heating according to the liquid volume and gas volume data, and the ideal gas state equation, and compare it with the initial pressure to obtain the pressure change data.

[0078] Wherein, the ideal gas state equation is PV=nRT, P: pressure of ideal gas; V: volume of ideal gas; n: amount of substance of ideal gas, unit is mole; T: thermodynamic temperature; R: gas constant; the ideal gas state equation is used to describe the volume and pressure change relationship of the inert gas before and after heating; the pressure change data refers to the difference between the internal cavity pressure after heating and the initial pressure. Exemplarily, assuming ΔT=T2-T1, under the condition that the number of gas moles n is constant:

[0079] The volume of the inert gas at the initial temperature T1 is ;

[0080] The volume of the inert gas after heating to the target temperature T2 is:

[0081] ;

[0082] According to the ideal gas equation:

[0083]

[0084] Therefore, the pressure difference between the inner cavity after heating and the outside (initial pressure

[0085]

[0086] S104, based on the volume change and pressure change data, determine the maximum injection ratio of the heat-conducting medium, and combine the maximum injection ratio with the operating parameters to generate heating control parameters.

[0087] Wherein, the maximum injection ratio refers to the upper limit of liquid filling under the volume and pressure constraints; the heating control parameters are control data sets containing injection ratio and boundary constraints. Demonstratively, when the liquid volume V o2 after heating V, and the inner cavity pressure difference ΔP , the injection ratio is a legal value. Combined with the example calculation results, it is necessary to ensure <92.9%, according to which the heating control parameters formed can be directly used for subsequent temperature control and operation management.

[0088] Step S200, inject the heat-conducting medium into the inner cavity of the heating roller according to the heating control parameters, establish the heat-conducting medium heat transfer path between the heating assembly and the roller body of the heating roller, and generate initial heating state data.

[0089] Wherein, the heat transfer path is a continuous liquid transfer path formed by the heat-conducting medium in the inner cavity of the roller body, which is used to realize heat exchange between the heating assembly and the roller body; the initial heating state data refers to the record data identifying the filling and sealing conditions of the heat-conducting medium after the path is established. Demonstratively, according to the maximum injection ratio previously calculated, when performing the liquid injection operation, fill the heat-conducting medium to a volume of V, while ensuring that the remaining (1- )V space as a gas phase buffer zone. After completing the liquid injection and sealing, the system generates a path establishment identifier, which is combined with the liquid injection configuration parameters to form the initial heating state data.

[0090] In an alternative embodiment, step S200 includes the following sub-steps:

[0091] S201, generate liquid injection configuration data based on the heating control parameters, the liquid injection configuration data at least including the target injection ratio and the corresponding gas phase space parameters.

[0092] Wherein, the liquid injection configuration data refers to the liquid volume distribution scheme and the remaining gas space data calculated according to the heating control parameters; the gas phase space parameters refer to the volume of gas in the cavity after the liquid injection is completed and the compressibility constraint thereof. Demonstratively, when the heating control parameters specify the target injection ratio ​= 92.9%, then the liquid volume in the liquid injection configuration data is V, the volume of the gas phase space is (1- ) V, and the corresponding gas compressibility parameter is recorded, ensuring that it meets the constraint condition of the allowable pressure difference P c of the sealing element.

[0093] S202, according to the liquid injection configuration data, performing liquid injection and sealing to form a heat transfer medium heat transfer path, and generating path establishment identification data corresponding thereto.

[0094] The path establishment identification data refers to identification information generated after the completion of the liquid injection and sealing operation to confirm that the heat transfer path has been established. Illustratively, according to the liquid injection configuration data, the heat transfer medium is injected into the inner cavity of the roller body in a volume of V, and then the port is closed by the sealing element to ensure the stable existence of the gas-liquid two-phase, and a unique identification ID is generated in the system database to represent the establishment state of the heat transfer path.

[0095] S203, associating the liquid injection configuration data with the path establishment identification data to generate initial heating state data.

[0096] The association refers to the binding of the liquid injection configuration data and the path establishment identification at the data structure level; the initial heating state data refers to a comprehensive record containing liquid volume distribution, gas phase space parameters, and path establishment identification. Illustratively, the liquid injection configuration parameters (liquid volume, gas phase volume, pressure difference threshold) are associated with the corresponding path identification ID in the form of key-value pairs in the database, and the final initial heating state data is output for subsequent heating process control and operation monitoring.

[0097] Step S300, based on the heating state data, segmenting the heating assembly along the roller body axis of the heating roller, and obtaining the mapping relationship between the roller surface temperature measurement points and each heating segment.

[0098] The segmentation refers to the segmentation and division of the heating rod assembly 10 in the axial direction of the heating roller, for example, into 11-heating segment A, 12-heating segment B, and 13-heating segment B, each segment independently bearing the operating state of a heating unit; the mapping relationship refers to the one-to-one correspondence information between the roller surface temperature measurement points (roller surface measurement point A-60; roller surface measurement point B-61; roller surface measurement point C-62) and the heating segment measurement points (heating segment measurement point A-70; heating segment measurement point B-71; heating segment measurement point C-72), used to realize the association of temperature collection and heating control, as shown in Figure 5 Illustratively, when the roller body effective length L is included in the heating state data, the length can be divided into n heating segments according to a predetermined rule, and a temperature measurement point is arranged in the corresponding roller surface area of each heating segment, and finally a corresponding table of measurement points and heating segments is obtained. ​

[0099] In an alternative embodiment, step S300 comprises the following sub-steps:

[0100] S301, establishing a segmentation reference along the axial direction of the roll body of the heating roller based on the heating state data, to obtain segmentation information of the heating assembly.

[0101] Wherein, the segmentation reference refers to a segmentation division standard determined according to the roll body length and the running condition; the segmentation information refers to the start and end positions of each heating segment and the corresponding number. Exemplarily, if the effective length of the roll body L = 1200 mm, and the number of segments n = 3 is set, then the segmentation reference is to divide a segment every 400 mm, and the segmentation information obtained is: the first segment 0-400 mm, the second segment 400-800 mm, and the third segment 800-1200 mm. It can be understood that the form and number of segments can be set according to actual conditions, i.e. A segment, B segment, C segment, first segment, second segment, third segment, and the number of segments is set to 3 segments in this embodiment.

[0102] S302, determining the temperature measurement point positions at both ends and the middle of the roll surface based on the segmentation information, to obtain measurement point information.

[0103] Wherein, the measurement point information refers to the specific coordinate positions and numbers of the temperature sensors arranged on the roll surface. Exemplarily, if the segmentation information is three segments, then temperature measurement points T1, T2, and T3 are arranged at 0 mm, 600 mm, and 1200 mm of the roll surface respectively, and the measurement point information obtained is {T1:(0 mm), T2:(600 mm), T3:(1200 mm)}.

[0104] S303, position corresponding the segmentation information and the measurement point information, to generate segmentation heating mapping data.

[0105] Wherein, the segmentation heating mapping data refers to the corresponding data structure between the heating segment number and the temperature measurement point position, which is used for subsequent temperature distribution calculation and heating control. Exemplarily, the first segment (0-400 mm) corresponds to T1, the second segment (400-800 mm) corresponds to T2, and the third segment (800-1200 mm) corresponds to T3, and the finally formed mapping data is {first segment: T1, second segment: T2, third segment: T3}.

[0106] Step S400, according to the mapping relationship, applying an initial heating power to each heating segment and collecting temperature data of each temperature measurement point, to form temperature difference evaluation data.

[0107] wherein the mapping relationship refers to a one-to-one correspondence between the roll surface temperature measuring point and each heating section; the initial heating power refers to the starting power set for each heating section after the segmentation; and the temperature difference evaluation data refers to the axial temperature difference result obtained by associating the measured temperature with the heating section based on the mapping relationship. Exemplarily, under three-section heating and three-measuring point layout, the starting power vector is generated according to the mapping relationship ; under a preset collection period t, the temperature vectors of heating section A (left measuring point), heating section B (middle measuring point), and heating section C (right measuring point) are obtained:

[0108] ;

[0109] Accordingly, the axial temperature difference vector is calculated:

[0110] ;

[0111] Thus, the temperature difference evaluation data is formed at time tk .

[0112] In an optional embodiment, as shown in Figure 7 , the step S400 includes the following sub-steps:

[0113] S401, generating initial heating power setting data of each heating section according to the segmented heating mapping data.

[0114] wherein the segmented heating mapping data refers to an information set containing the heating section number and the corresponding temperature measuring point position / number; and the initial heating power setting data refers to a starting power parameter set configured for each heating section according to the mapping relationship. Exemplarily, under the segmented heating mapping of heating section A (left measuring point), heating section B (middle measuring point), and heating section C (right measuring point), the initial power setting vector is generated according to the mapping .

[0115] S402, driving each heating section to perform heating based on the initial heating power setting data, and obtaining temperature data of each temperature measuring point according to a preset collection period to obtain a temperature vector.

[0116] wherein the preset collection period refers to a fixed time interval of temperature collection; and the temperature vector refers to multi-dimensional temperature data composed of readings of each measuring point at the same collection time. Exemplarily, under the action of , each heating section starts heating, and the temperature is polled and collected at the collection period , forming a time sequence The processing output of this sequence at each time tk is the temperature vector of the corresponding heating section A (left measuring point), heating section B (middle measuring point), and heating section C (right measuring point) .

[0117] S403, based on the segmented heating mapping data, associates the temperature vector with the corresponding heating segment, and calculates the axial temperature difference vector to form temperature difference assessment data.

[0118] Among them, the axial temperature difference vector refers to the vector formed by the temperature difference between the measuring point in the middle of the heating section and the measuring points at both ends of the heating section along the axial direction of the roller; the temperature difference evaluation data refers to the set of evaluation results that include the temperature vector and the axial temperature difference vector.

[0119] Exemplary, will The segmented heating is mapped to segments A, B, and C respectively, and the calculation is performed. and with Together constituting moment Temperature difference assessment data This serves as the basis for subsequent power adjustment processing based on temperature difference.

[0120] Step S500: Adjust the heating power of each heating section based on the temperature difference assessment data until the temperature difference of the heating roller surface meets the preset conditions.

[0121] Exemplarily, this embodiment employs a three-segment heating structure. Heating segment B is located in the middle of the roller body, serving as the reference segment; heating segments A and C are located in the journal regions at both ends of the roller body, serving as side segments. During operation, using the temperature of the middle segment as a reference, the heating power of the heating segments at both ends is gradually increased to compensate for the temperature loss caused by heat dissipation at the ends of the roller body, causing the temperatures at both ends to gradually rise and approach the temperature of the middle segment. When the temperature difference between the ends and the middle segment is monitored to decrease to within the required range for the operating conditions (e.g., less than 1°C), the power increase can be stopped to ensure the axial temperature consistency of the roller surface. In other words, with a middle segment and symmetrically distributed segments on both sides, the more segments there are, the more precise the temperature control can be, and the smaller the temperature difference on the roller surface can be, but more feedback measurement points are required. The heating power of each segment is controlled based on the temperature feedback from the measurement points.

[0122] In one alternative embodiment, such as Figure 8 As shown, step S500 includes the following sub-steps:

[0123] S501 generates power adjustment commands for each heating section based on temperature difference assessment data.

[0124] The power adjustment instruction is numerical adjustment information derived in combination with the temperature difference evaluation result, and defines the heating power size that needs to be increased or decreased. For example, the power adjustment amount ΔP1 of the heating section A, the power adjustment amount ΔP2 of the heating section B, and the power adjustment amount ΔP3 of the heating section C (if Δ is positive, it indicates that the power of the corresponding heating section needs to be increased; if Δ is negative, it indicates that the power of the corresponding heating section needs to be decreased). Exemplarily, when the temperature difference evaluation data shows that the temperatures on both sides of the roller surface are lower than the temperature of the middle section, an instruction is generated to increase the power of the heating section A and the heating section C, so as to narrow the temperature difference; if the temperature difference is negative, a power reduction instruction can be generated to maintain balance.

[0125] S502, updating the power setting data of each heating section according to the power adjustment instruction to form a current power setting state.

[0126] The power setting data refers to the target power value allocated to each heating section, and the power setting state refers to the updated power allocation of each heating section. For example, if the initial setting of the power of the heating section A and the heating section C is P1 and P3 respectively, the updated power setting state can be represented as [P1+ΔP1, P2, P3+ΔP3], wherein ΔP1 and ΔP3 are given by step S501, and the power of the heating section B remains unchanged.

[0127] S503, driving each heating section to perform heating based on the current power setting state, and acquiring temperature data of each temperature measuring point according to a preset acquisition period to obtain a new round of temperature vector.

[0128] The temperature measuring point refers to a key position arranged at both ends and the middle of the roller surface, and a thermocouple is arranged by lateral punching to realize real-time temperature acquisition; the temperature vector refers to a set composed of three groups of temperature measuring points. Exemplarily, in each acquisition period, the temperature measuring points Tleft, Tmid, and Tright are read to form the temperature vector [Tleft, Tmid, Tright].

[0129] S504, matching the new round of temperature vector with the corresponding relationship of each heating section, calculating the corresponding axial temperature difference vector to obtain new temperature difference evaluation data.

[0130] The axial temperature difference vector refers to a set of temperature difference values of the middle measuring point and the two end measuring points of the roller surface. Exemplarily, the temperature difference vector [Tmid-Tleft, Tmid-Tright] can be calculated, and new temperature difference evaluation data is formed according to the temperature difference vector, reflecting the temperature difference between the two ends and the middle.

[0131] S505, comparing the new temperature difference evaluation data with the preset temperature difference condition, if the preset condition is not met, continuing to perform power adjustment, temperature acquisition, and temperature difference evaluation based on the new temperature difference evaluation data until the preset condition is met.

[0132] The preset temperature difference condition refers to a threshold limit for ensuring the uniformity of the roll surface. For example, the threshold can be set as follows: the temperature difference between the two end measuring points and the middle measuring point is less than 1°C. In this embodiment, by gradually increasing the power of heating section A and heating section C, the temperature on both sides gradually increases and approaches the middle, and when the threshold condition is met, the power adjustment is stopped and the temperature difference control is completed.

[0133] Further, the midpoint of each heating rod assembly is also provided with an independent thermocouple measuring point for monitoring the local temperature around the heating rod fixing part to prevent the local temperature from exceeding the allowable use temperature of the heat-conducting liquid. When the temperature reaches the upper limit, the system can stop increasing the power, thereby avoiding the failure of the heat-conducting liquid due to overheating. In addition, the heating rod fixing part not only ensures the stable fixation of the heating rod, but also generates relative motion with the heat-conducting liquid during the rotation of the roll body, which promotes the forced convection heat exchange of the liquid, further improves the heat transfer efficiency in the roll body, and ensures the stability and uniformity of the segmented heating control.

[0134] In an alternative embodiment, the step S500 further includes the following sub-steps:

[0135] The power setting state, temperature vector and temperature difference evaluation data of each round are recorded to form a temperature control process log.

[0136] The power setting state refers to the real-time power parameters of each heating section during the power adjustment process; the temperature vector refers to a numerical set formed by the temperature values of each temperature measuring point obtained within a preset collection period; and the temperature difference evaluation data is an axial temperature difference vector calculated based on the temperature vector and the mapping relationship.

[0137] For example, the above-mentioned temperature control process log can be stored in the form of a table or structured data to realize complete recording of the entire temperature adjustment process.

[0138] Figure 9 A structure schematic diagram of a temperature control method of a heating roller according to an embodiment of the present application is shown. For example, the temperature control device 200 of the heating roller includes:

[0139] The parameter determination module 210 is configured to calculate the operating state change of the heat-conducting medium under the target working condition according to the operating parameters of the heating roller, and determine the heating control parameters;

[0140] The data generation module 220 is configured to inject the heat-conducting medium into the inner cavity of the heating roller according to the heating control parameters, establish a heat-conducting medium heat transfer path between the heating assembly and the roll body of the heating roller, and generate initial heating state data;

[0141] The mapping module 230 is configured to segment the heating assembly along an axial direction of a roller body of the heating roller based on the heating state data, and obtain a mapping relationship between a temperature measuring point on a roller surface and each heating segment.

[0142] The collecting module 240 is configured to apply an initial heating power to each heating segment according to the mapping relationship, and collect temperature data of each temperature measuring point to form temperature difference evaluation data.

[0143] The adjusting module 250 is configured to adjust the heating power of each heating segment based on the temperature difference evaluation data until the temperature difference on the roller surface of the heating roller meets a preset condition.

[0144] It can be understood that the device of the embodiment corresponds to the method of the above-mentioned embodiment, and the optional items in the above-mentioned embodiment are also applicable to the embodiment, and thus will not be described here again.

[0145] The application further provides a roller pressing device. The roller pressing device includes a processor and a memory. The memory stores a computer program. The processor runs the computer program, so that the roller pressing device performs the functions of the above-mentioned method or each module in the above-mentioned device.

[0146] The processor can be an integrated circuit chip with a signal processing capability. The processor can be a general-purpose processor, including a central processing unit (CPU), a graphics processing unit (GPU), and a network processor (NP), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or at least one of them. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc., which can realize or execute the disclosed methods, steps, and logic block diagrams in the embodiments of the application.

[0147] The memory can be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), and the like. Among them, the memory is used to store a computer program, and the processor can execute the computer program correspondingly after receiving an execution instruction.

[0148] The application further provides a computer readable storage medium for storing the computer program used in the roll pressing device. For example, the computer readable storage medium can include, but is not limited to, a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various storage program codes.

[0149] In several embodiments provided in the application, it should be understood that the disclosed apparatus and method can also be implemented by other ways. The apparatus embodiments described above are only schematic, for example, the flow chart and block diagram in the drawings show the possible implementation architecture, function and operation of the apparatus, method and computer program product according to the embodiments of the application. In this regard, each block in the flow chart or block diagram can represent a module, a program segment or a part of code, which contains one or more executable instructions for implementing the specified logical function. It should also be noted that, in alternative implementation ways, the functions noted in the block can also occur in different order from that noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. It should also be noted that each block in the structural diagram and / or flow chart, and the combination of blocks in the structural diagram and / or flow chart, can be implemented by a special hardware-based system for executing the specified function or action, or can be implemented by a combination of special hardware and computer instructions.

[0150] In addition, each functional module or unit in the embodiments of the application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0151] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

[0152] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application.

Claims

1. A temperature control method of a heating roller characterized by, The method comprises: According to the operating parameters of the heating roller, the operating state change of the heat conducting medium under the target working condition is calculated, and the heating control parameters are determined, including: Obtain the total volume of the inner cavity of the heating roller, the volume expansion coefficient, the initial temperature, the target temperature, the initial pressure and the pressure difference allowed by the sealing member of the heat conducting medium, and construct the operating parameter set; Based on the operating parameter set, the volume change amount of the heat conducting medium at the target temperature is calculated, and the liquid volume and gas volume data after heating are obtained; According to the liquid volume and gas volume data, and the ideal gas state equation, the inner cavity pressure after heating is calculated and compared with the initial pressure, and the pressure change data is obtained; Based on the volume change amount and the pressure change data, the maximum injection ratio of the heat conducting medium is determined, and the maximum injection ratio is combined with the operating parameters to generate the heating control parameters; According to the heating control parameters, the heat conducting medium is injected into the inner cavity of the heating roller, the heat conducting medium heat transfer channel between the heating assembly and the roller body of the heating roller is established, and the initial heating state data is generated, including: Based on the heating control parameters, injection configuration data is generated, which at least includes the target injection ratio and the corresponding gas phase space parameters; According to the injection configuration data, injection and sealing are performed to form the heat conducting medium heat transfer channel, and the corresponding channel establishment identification data is generated; The injection configuration data and the channel establishment identification data are associated to generate the initial heating state data; Based on the heating state data, the heating assembly is segmented along the roller body axis of the heating roller, and the mapping relationship between the roller surface temperature measuring point and each heating segment is obtained; According to the mapping relationship, initial heating power is applied to each heating segment, and temperature data of each temperature measuring point is collected to form temperature difference evaluation data; Based on the temperature difference evaluation data, the heating power of each heating segment is adjusted until the roller surface temperature difference of the heating roller meets the preset condition.

2. The temperature control method of a heating roll according to claim 1, characterized by, Based on the heating state data, the heating assembly is segmented along the roller body axis of the heating roller, and the mapping relationship between the roller surface temperature measuring point and each heating segment is obtained, including: Based on the heating state data, a segmentation reference along the roller body axis of the heating roller is established to obtain the segmentation information of the heating assembly; Based on the segmentation information, the temperature measuring point positions at both ends and the middle of the roller surface are determined to obtain the measuring point information; The segmentation information and the measuring point information are positionally corresponding to generate segmentation heating mapping data.

3. The temperature control method of a heating roll according to claim 2, characterized by, According to the mapping relationship, initial heating power is applied to each heating segment, and temperature data of each temperature measuring point is collected to form temperature difference evaluation data, including: According to the segmentation heating mapping data, initial heating power setting data of each heating segment is generated; Based on the initial heating power setting data, each heating segment is driven to perform heating, and temperature data of each temperature measuring point is obtained according to a preset collection period to obtain a temperature vector; Based on the segmentation heating mapping data, the temperature vector is associated with the corresponding heating segment, an axial temperature difference vector is calculated to form temperature difference evaluation data.

4. The temperature control method of a heating roll according to claim 1, characterized by, Based on the temperature difference evaluation data, the heating power of each heating segment is adjusted until the roller surface temperature difference of the heating roller meets the preset condition, including: According to the temperature difference evaluation data, power adjustment instructions of each heating section are generated; According to the power adjustment instructions, power setting data of each heating section is updated to form a current power setting state; Based on the current power setting state, each heating section is driven to perform heating, and temperature data of each temperature measuring point is acquired according to a preset acquisition period to obtain a new round of temperature vector; The new round of temperature vector is matched with the corresponding relationship of each heating section to calculate a corresponding axial temperature difference vector to obtain new temperature difference evaluation data; The new temperature difference evaluation data is compared with a preset temperature difference condition, and if the preset condition is not met, power adjustment, temperature acquisition and temperature difference evaluation are continued based on the new temperature difference evaluation data until the preset condition is met.

5. The temperature control method of a heating roll according to claim 1, characterized by, The method further comprises: Recording each round of power setting state, temperature vector and temperature difference evaluation data to form a temperature control process log.

6. A temperature control device for a heating roller, characterized by comprising: Comprise: A parameter determination module is configured to calculate the operating state change of the heat conducting medium under the target working condition according to the operating parameters of the heating roller, and determine the heating control parameters, including: Obtaining the total volume of the inner cavity of the heating roller, the volume expansion coefficient, the initial temperature, the target temperature, the initial pressure and the allowable pressure difference of the sealing member of the heat conducting medium, and constructing an operating parameter set; Based on the operating parameter set, the volume change amount of the heat conducting medium at the target temperature is calculated to obtain the liquid volume and gas volume data after heating; According to the liquid volume and gas volume data, and the ideal gas state equation, the inner cavity pressure after heating is calculated and compared with the initial pressure to obtain pressure change data; Based on the volume change amount and the pressure change data, the maximum injection ratio of the heat conducting medium is determined, and the maximum injection ratio is combined with the operating parameters to generate the heating control parameters; A data generation module is configured to inject the heat conducting medium into the inner cavity of the heating roller according to the heating control parameters, establish a heat conducting medium heat transfer channel between the heating assembly and the roller body of the heating roller, and generate initial heating state data, including: Based on the heating control parameters, injection configuration data is generated, and the injection configuration data at least includes the target injection ratio and the corresponding gas phase space parameters; According to the injection configuration data, injection and sealing are performed to form the heat conducting medium heat transfer channel, and corresponding channel establishment identification data is generated; The injection configuration data and the channel establishment identification data are associated to generate the initial heating state data; A mapping module is configured to segment the heating assembly along the axial direction of the roller body of the heating roller based on the heating state data, and acquire the mapping relationship between the roller surface temperature measuring point and each heating section; An acquisition module is configured to apply an initial heating power to each heating section according to the mapping relationship and acquire temperature data of each temperature measuring point to form temperature difference evaluation data; An adjustment module is configured to adjust the heating power of each heating section based on the temperature difference evaluation data until the temperature difference of the heating roller surface meets the preset condition.

7. A calendering apparatus characterized by, The rolling device comprises a processor and a memory, and the memory stores a computer program, and the processor is configured to execute the computer program to implement the temperature control method of the heating roller in any one of claims 1-4.

8. A computer-readable storage medium, characterized in that, The computer program is stored in the memory and, when executed on the processor, implements the temperature control method of the heating roller according to any one of claims 1-4.

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