A temperature adjustment method and a temperature adjustment system

Abstract

The application provides a temperature adjusting method and a temperature adjusting system. A programmable logic controller automatically compensates each oven, determines a compensation set temperature of the oven after temperature compensation, and sends the compensation set temperature to a temperature control meter. The temperature control meter determines a corresponding temperature adjusting signal according to the compensation set temperature of each oven and sends the temperature adjusting signal to a proportional valve corresponding to the oven. According to the temperature adjusting signal, the proportional valve controls the opening of the valve to the valve opening degree indicated by the temperature adjusting signal, so as to complete the temperature adjustment of the oven corresponding to the proportional valve. The application improves the consistency of the oven temperature in the continuous production process through the coating machine self-learning method, thereby improving the product quality and consistency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, and particularly relates to a temperature regulation method and a temperature regulation system. BACKGROUND

[0002] At present, the heating mode of the oven of the coating machine in the industry is mainly steam and heat conducting oil.

[0003] The heat conducting oil or steam heats the fins through the heat exchanger, the fresh air is introduced into the air inlet pipeline, the fresh air is heated to the set temperature through the heating fins, then the hot air is conducted to the inside of the oven hull through the circulating fan, finally the hot air is blown to the surface of the pole piece at a certain speed through the uniform air function of the air nozzle, so that the function of the pole piece surface oven is achieved, and in this process, the temperature and the air speed of the hot air must be kept stable, so as to ensure the consistency of the quality and product parameters of the pole piece after baking.

[0004] At present, the oven temperature maintaining stable mode mainly through thermocouple detection, temperature control table control and proportional valve adjustment, but due to the control accuracy of the temperature control table (≥±1 degree), the detection accuracy of the thermocouple (≥±1.5 degrees) and the adjustment accuracy of the steam and heat conducting oil proportional valve, the actual temperature of the oven cannot reach the temperature set by the process technology, the over-temperature and low-temperature situations frequently occur, and the quality and product consistency of the pole piece oven are affected. SUMMARY

[0005] Therefore, the present application aims to provide at least a temperature regulation method and a temperature regulation system, which improve the consistency of the oven temperature in the continuous production process through the coating machine self-learning method, so as to improve the product quality and consistency.

[0006] The present application mainly includes the following aspects:

[0007] In a first aspect, the embodiments of the present application provide a temperature adjusting method applied to a temperature adjusting system, the temperature adjusting system comprising a coating machine, a temperature control meter, a programmable logic controller and a plurality of proportional valves, the coating machine comprising a plurality of ovens, each oven being connected to a corresponding proportional valve, and each oven being internally provided with a thermocouple, wherein the method comprises: the temperature control meter determining an actual temperature of an oven to which each thermocouple belongs according to temperature information corresponding to each thermocouple received, and sending the actual temperature to the programmable logic controller; the programmable logic controller performing the following temperature compensation processing for the actual temperature of each oven received: comparing the actual temperature corresponding to the oven with an original set temperature corresponding to the oven, actively performing temperature compensation on the oven according to a comparison result, determining a compensation set temperature and sending the compensation set temperature to the temperature control meter; the temperature control meter determining a temperature adjusting signal corresponding to each oven according to the compensation set temperature corresponding to each oven received, and sending the temperature adjusting signal to the proportional valve corresponding to the oven; for each proportional valve, the proportional valve controls a valve opening to a valve opening degree indicated by the temperature adjusting signal received, so as to complete temperature adjustment on the oven corresponding to the proportional valve.

[0008] In a possible implementation, the temperature information carries a thermocouple model identifier and a hot end voltage value, and the temperature control meter determines the actual temperature of the oven to which each thermocouple belongs by: according to the thermocouple model identifier corresponding to the thermocouple, calling a cold end voltage value corresponding to the thermocouple from a preset thermocouple information table, the preset thermocouple information table recording a mapping relationship between a plurality of thermocouple model identifiers and a plurality of cold end voltage values; calculating a potential difference between the hot end voltage value and the cold end voltage value corresponding to the thermocouple, and determining the actual temperature of the oven to which the thermocouple belongs according to the potential difference and a first proportional function acquired in advance, the first proportional function indicating a proportional relationship between the potential difference and the temperature value.

[0009] In a possible implementation, the programmable logic controller determines the compensation set temperature corresponding to each oven by: judging whether the comparison result corresponding to the oven satisfies a temperature compensation condition, the temperature compensation condition being that the actual temperature of the oven is greater than or less than the original set temperature corresponding to the oven; if the comparison result corresponding to the oven satisfies the temperature compensation condition, determining the compensation set temperature corresponding to the oven, and performing temperature compensation on the oven; if the comparison result corresponding to the oven does not satisfy the temperature compensation condition, not performing temperature compensation on the oven, and returning to receive the actual temperature corresponding to the oven again.

[0010] In a possible implementation, the programmable logic controller determines the compensation set temperature corresponding to each section of the oven by: if the comparison result corresponding to the oven satisfies the temperature compensation condition, determining a temperature compensation value corresponding to the oven, the temperature compensation value being an absolute value of a difference between the actual temperature of the oven and the original set temperature; and determining a sum value between the original set temperature corresponding to the oven and the temperature compensation value as the compensation set temperature corresponding to the oven.

[0011] In a possible implementation, before determining the compensation set temperature corresponding to each section of the oven, the temperature control table performs the following processing on each compensation set temperature of each section of the oven received: determining whether the compensation set temperature corresponding to the oven satisfies a temperature adjustment condition, the temperature adjustment condition being that a difference between the compensation set temperature corresponding to the oven and the actual temperature is equal to twice the temperature compensation value; if the compensation set temperature corresponding to the oven satisfies the temperature adjustment condition, determining a temperature adjustment signal corresponding to the oven according to the compensation set temperature of the oven; and if the compensation set temperature corresponding to the oven does not satisfy the temperature adjustment condition, returning to re-collect the actual temperature corresponding to the oven.

[0012] In a possible implementation, the temperature control table determines the temperature adjustment signal corresponding to each section of the oven by: determining a difference between the compensation set temperature corresponding to the oven and the actual temperature; and performing PID conversion on the difference between the compensation set temperature corresponding to the oven and the actual temperature by using a second proportional function to determine the temperature adjustment signal corresponding to the oven, the temperature adjustment signal indicating a current signal, and the second proportional function indicating a proportional relationship between the difference between the compensation set temperature and the actual temperature and the current signal.

[0013] In a possible implementation, each proportional valve completes temperature adjustment of the oven corresponding to the proportional valve by: the proportional valve obtaining a third proportional function, the third proportional function indicating a proportional relationship between the current signal and the valve opening; and controlling the valve opening of the proportional valve to the valve opening indicated by the current signal indicated by the temperature adjustment signal received by the proportional valve by using the third proportional function and the current signal indicated by the temperature adjustment signal received by the proportional valve, to complete the temperature adjustment of the oven corresponding to the proportional valve.

[0014] In a possible implementation, the method further comprises: the temperature controller sends a compensation set temperature to each received oven, generates a corresponding adjustment cumulative signal of the oven and sends it to the programmable logic controller while sending a corresponding temperature adjustment signal of the oven to a corresponding proportional valve of the oven; the programmable logic controller accumulates the number of temperature adjustments of each received oven according to the corresponding adjustment cumulative signal of the oven, and determines a total adjustment number of the oven; the programmable logic controller performs alarm processing on each oven: if the total adjustment number of the oven is less than or equal to a preset threshold, the oven is fault-free and no alarm is given; if the total adjustment number of the oven is greater than the preset threshold, the oven is faulty and an alarm is given and the oven is shut down.

[0015] In a second aspect, the embodiments of the present application further provide a temperature adjustment system, which comprises a coating machine, a temperature controller, a programmable logic controller and a plurality of proportional valves. The coating machine comprises a plurality of ovens, each oven is connected to a corresponding proportional valve, and each oven is built-in with a thermocouple. The temperature controller determines the actual temperature of the oven to which each thermocouple belongs according to the received temperature information of each thermocouple, and sends the actual temperature to the programmable logic controller. The programmable logic controller performs the following temperature compensation processing according to the received actual temperature of each oven: compares the actual temperature of the oven with an original set temperature of the oven, actively compensates the temperature of the oven according to the comparison result, determines a compensation set temperature and sends the compensation set temperature to the temperature controller. The temperature controller determines a temperature adjustment signal of each received oven and sends the temperature adjustment signal to a corresponding proportional valve of the oven. For each proportional valve, the proportional valve controls the valve to open to a valve opening degree indicated by the received temperature adjustment signal, so as to complete the temperature adjustment of the oven corresponding to the proportional valve.

[0016] In a possible implementation, the temperature information carries a thermocouple model identifier and a hot end voltage value. The temperature controller retrieves a cold end voltage value corresponding to the thermocouple from a preset thermocouple information table according to the thermocouple model identifier corresponding to the thermocouple. The preset thermocouple information table records a mapping relationship between a plurality of thermocouple model identifiers and a plurality of cold end voltage values. The temperature controller calculates a potential difference between the hot end voltage value and the cold end voltage value corresponding to the thermocouple, and determines the actual temperature of the oven to which the thermocouple belongs according to the potential difference and a first proportional function obtained in advance. The first proportional function indicates a proportional relationship between the potential difference and the temperature value.

[0017] The temperature adjusting method and the temperature adjusting system provided by the embodiment of the present application can automatically compensate the temperature of each oven by the programmable logic controller, determine the compensation set temperature of the oven after the temperature compensation, and send the compensation set temperature to the temperature control meter; the temperature control meter determines the corresponding temperature adjusting signal according to the compensation set temperature of each oven and sends the temperature adjusting signal to the proportional valve corresponding to the oven; the proportional valve controls the opening of the valve to the valve opening degree indicated by the temperature adjusting signal according to the received temperature adjusting signal, so as to complete the temperature adjustment of the oven corresponding to the proportional valve. The self-learning method of the coating machine is used to improve the consistency of the oven temperature in the continuous production process, thereby improving the product quality and consistency.

[0018] The present application has the advantages of:

[0019] 1. Improve production efficiency: through the present application, the coating machine can automatically adjust the oven process temperature set value by the self-learning method, and reduce the situation of personnel downtime adjustment;

[0020] 2. Improve product quality and product consistency: the present application actively and quickly adjusts the difference between the actual temperature of the oven and the process temperature set value by the self-learning method of the coating machine, improves the consistency of the oven temperature in the continuous production process, and thereby improves the product quality and consistency;

[0021] 3. Reduce the risk of manual adjustment: the present application actively and quickly adjusts the difference between the actual temperature of the oven and the process temperature set value by the self-learning method of the coating machine, and prevents the product from being scrapped due to the error of personnel active input parameters.

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0023] 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 on the basis of these drawings.

[0024] Figure 1 A flow chart of the steps of a temperature adjusting method provided by the embodiment of the present application is shown;

[0025] Figure 2 A flow chart of the steps of a thermocouple actual temperature determination method provided by the embodiment of the present application is shown;

[0026] Figure 3 A schematic diagram of oven temperature adjustment provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and superiorities of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of illustration and description, and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present application show the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts by those skilled in the art under the guidance of the content of the present application.

[0028] In addition, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor are within the scope of protection of the present application.

[0029] At present, the main way to maintain the stability of the oven temperature is through thermocouple detection + temperature control table control + proportional valve adjustment. However, due to the control accuracy of the temperature control table (≥±1 degree), the detection accuracy of the thermocouple (≥±1.5 degrees), and the adjustment accuracy of the electric proportional valve of steam and heat conducting oil, the actual temperature of the oven cannot reach the temperature set by the process technology, and the situation of over-temperature and low-temperature frequently occurs, which affects the quality of the pole piece oven and the product consistency. In order to solve this situation, there are currently two ways:

[0030] 1. Increase the upper and lower limits of the set temperature. If the actual temperature detected is within the upper and lower limits of the set temperature, it is qualified.

[0031] 2. If the actual temperature is higher than the set value, manually modify the set temperature compensation value to reduce the actual temperature to reach the required temperature of the original process. Conversely, increase the set temperature compensation value (for example: the set temperature is 90 degrees, and the actual temperature is 95 degrees. Then input -5 degrees in the set temperature compensation value column on the equipment. Conversely, if the set temperature is 90 degrees and the actual temperature is 85 degrees, then input 5 degrees in the set temperature compensation value column).

[0032] The above two adjustment methods affect the baking quality and personnel efficiency, and manual adjustment parameters are prone to errors, which can cause batch defects of the products to be processed (such as pole pieces).

[0033] Therefore, embodiments of the present application provide a temperature regulation system, a temperature regulation method and a device. The temperature regulation system improves the consistency of the oven temperature in the continuous production process through a coating machine self-learning method, thereby improving the product quality and consistency. Specifically, the temperature regulation system comprises a coating machine, a temperature control meter, a programmable logic controller and a plurality of proportional valves. The coating machine comprises a plurality of ovens, each oven is connected to a corresponding proportional valve, and each oven is internally provided with a thermocouple.

[0034] Please refer to Figure 1 , Figure 1 The present application provides a temperature regulation method. The steps of the temperature regulation method are shown in the flow chart. The temperature regulation method is applied to a temperature regulation system, which comprises a coating machine, a temperature control meter, a programmable logic controller and a plurality of proportional valves. The coating machine comprises a plurality of ovens, each oven is connected to a corresponding proportional valve, and each oven is internally provided with a thermocouple.

[0035] As shown in Figure 1 , the temperature regulation method provided by the present application comprises the following steps:

[0036] S100, the temperature control meter determines the actual temperature of each oven to which the thermocouple belongs according to the received temperature information of each thermocouple and sends it to the programmable logic controller.

[0037] S200, the programmable logic controller performs the following temperature compensation processing for the actual temperature of each oven: compares the actual temperature of the oven with the original set temperature of the oven, actively compensates the temperature of the oven according to the comparison result, determines the compensation set temperature and sends it to the temperature control meter.

[0038] S300, the temperature control meter determines the temperature regulation signal of each oven according to the received compensation set temperature of each oven and sends it to the proportional valve corresponding to the oven.

[0039] S400, for each proportional valve, the proportional valve controls the valve opening to the valve opening degree indicated by the received temperature regulation signal to complete the temperature regulation of the oven corresponding to the proportional valve.

[0040] In step S100, for each thermocouple, the thermocouple sends the real-time detected temperature information to the temperature control meter, wherein the temperature information carries the thermocouple model identifier and the hot end voltage value.

[0041] In a preferred embodiment, please refer to Figure 2 , Figure 2 The present application provides a thermocouple actual temperature determination method. The steps of the thermocouple actual temperature determination method are shown in the flow chart. As Figure 2As shown, the temperature control table determines the actual temperature of each oven to which the thermocouple belongs by the following way:

[0042] S1001, according to the thermocouple type identification corresponding to the thermocouple, the cold end voltage value corresponding to the thermocouple is retrieved from the preset thermocouple information table.

[0043] The preset thermocouple information table records the mapping relationship between a plurality of thermocouple type identifications and a plurality of cold end voltage values.

[0044] S1002, the potential difference between the hot end voltage value and the cold end voltage value corresponding to the thermocouple is calculated.

[0045] S1003, according to the potential difference and the first proportional function obtained in advance, the actual temperature of the oven to which the thermocouple belongs is determined.

[0046] The first proportional function indicates the proportional relationship between the potential difference and the temperature value.

[0047] Specifically, in the present application, the thermocouples in different ovens can be of different models, and only by means of the preset thermocouple information table can the cold end voltage values corresponding to different models of thermocouples be quickly determined, so as to facilitate accurate determination of the actual temperature corresponding to different ovens. Since the corresponding rated cold end voltage values of different models of thermocouples are different, once the thermocouples in the oven are replaced during the later maintenance process, the model changes, and if the original cold end voltage value corresponding to the original thermocouple model is still used to calculate the actual temperature, the result may be inaccurate.

[0048] The present application can be applied to the coating machine with mixed models by combining the preset thermocouple information table with the thermocouple type identification, and the accuracy of temperature regulation can be improved.

[0049] In another preferred embodiment, in step S200, the programmable logic controller determines the compensation set temperature corresponding to each oven by the following way:

[0050] If the comparison result corresponding to the oven satisfies the temperature compensation condition, the compensation set temperature corresponding to the oven is determined, the temperature of the oven is automatically compensated, and if the comparison result corresponding to the oven does not satisfy the temperature compensation condition, the actual temperature corresponding to the oven is received again.

[0051] In the present application, if the coating machine includes N ovens, the programmable logic controller will receive the actual temperature K n of each oven corresponding to the temperature control table at a preset time interval, n = 1, 2, … N, K nrepresents the actual temperature corresponding to the nth section of the oven, and the original set temperature T n is obtained n , if T n >K n , or T n <K n , it is determined that the comparison result corresponding to the nth section of the oven meets the temperature compensation condition, and the compensation set temperature corresponding to the nth section of the oven needs to be determined first, and the temperature compensation is performed on the nth section of the oven. In this application, after the compensation set temperature corresponding to the nth section of the oven is determined, the original set temperature T n of the nth section of the oven is updated using the determined compensation set temperature.

[0052] If T n = K n , it is determined that the comparison result corresponding to the nth section of the oven does not meet the temperature compensation condition, i.e. the temperature adjustment is not needed for the nth section of the oven, at this time, the actual temperature corresponding to the nth section of the oven is received again in the next time interval, and the comparison result is obtained again using the updated original set temperature T n of the nth section of the oven.

[0053] In another preferred embodiment, the programmable logic controller determines the compensation set temperature corresponding to each section of the oven by the following way:

[0054] If the comparison result corresponding to the oven meets the temperature compensation condition, the temperature compensation value corresponding to the oven is determined, which is the absolute value of the difference between the actual temperature of the oven and the original set temperature. The sum value between the original set temperature and the temperature compensation value corresponding to the oven is determined as the compensation set temperature corresponding to the oven.

[0055] In an example, assuming that the original set temperature corresponding to the oven is 90 degrees, and the actual temperature is only 85 degrees, at this time the temperature compensation value corresponding to the oven is 5 degrees, then the application automatically corrects the set temperature using the temperature compensation value, at this time the compensation set temperature corresponding to the oven output by the programmable logic controller is 95 degrees.

[0056] In a preferred embodiment, before step S300, the temperature control table executes the following processing for each section of the oven for which the compensation set temperature is received:

[0057] It is judged whether the compensation set temperature corresponding to the oven meets the temperature adjustment condition, which is that the difference between the compensation set temperature and the actual temperature corresponding to the oven is equal to twice the temperature compensation value. If the compensation set temperature corresponding to the oven meets the temperature adjustment condition, the corresponding temperature adjustment signal is determined according to the compensation set temperature of the oven. If the compensation set temperature corresponding to the oven does not meet the temperature adjustment condition, the actual temperature corresponding to the oven is collected again.

[0058] In an example, the temperature control table determines the compensation set temperature P n =95℃, the actual temperature value is 85℃, and the temperature compensation value is 5℃, then the compensation set temperature P n satisfies the temperature adjustment condition, the temperature control table automatically outputs the temperature adjustment signal to the corresponding proportional valve for temperature control adjustment.

[0059] In another preferred embodiment, the temperature control table determines the temperature adjustment signal corresponding to each oven section by the following method:

[0060] determines the difference between the compensation set temperature and the actual temperature corresponding to the oven section, uses a second proportional function to perform PID conversion on the difference between the compensation set temperature and the actual temperature corresponding to the oven section, determines the temperature adjustment signal corresponding to the oven section, the temperature adjustment signal indicates a current signal, and the second proportional function indicates the proportional relationship between the difference between the compensation set temperature and the actual temperature and the current signal.

[0061] In a specific implementation, the programmable logic controller outputs the compensation set temperature P n to the temperature control table, and the temperature control table performs PID conversion on the difference between P n and the actual temperature value corresponding to the nth oven section, outputs a corresponding current signal to the proportional valve, and the current signal is in the range of 4-20 mA.

[0062] In step S400, each proportional valve completes temperature adjustment of the oven section corresponding to the proportional valve by the following method:

[0063] The proportional valve obtains a third proportional function, the third proportional function indicates the proportional relationship between the current signal and the valve opening, and uses the third proportional function and the current signal indicated by the temperature adjustment signal received by the proportional valve to control the valve opening of the proportional valve to the valve opening indicated by the temperature adjustment signal, so as to complete the temperature adjustment of the oven section corresponding to the proportional valve.

[0064] According to each proportional valve, after receiving the corresponding current signal, the opening of the valve is controlled according to the third proportional function, so as to control the steam or heat conducting oil flow size. In this control process, the current signal and the valve opening of the proportional valve present a positive linear correlation.

[0065] In a preferred embodiment, the method further comprises:

[0066] The temperature control meter sets the temperature of compensation for each received oven, generates the adjustment cumulative signal of the oven corresponding to the temperature adjustment signal of the oven corresponding to the proportional valve, and sends it to the programmable logic controller. The programmable logic controller accumulates the number of temperature adjustments of each oven corresponding to the received adjustment cumulative signal of the oven, determines the total number of adjustments of the oven, and the programmable logic controller performs alarm processing for each oven: if the total number of adjustments of the oven is less than or equal to the preset threshold, the oven is fault-free and no alarm is given, and if the total number of adjustments of the oven is greater than the preset threshold, the oven is faulty, an alarm is given and the oven is shut down.

[0067] In an example, refer to Figure 3 , Figure 3 A schematic diagram of the oven temperature adjustment provided by the embodiment of the application is shown. As Figure 3 shown, it includes:

[0068] S500, temperature detection of the oven.

[0069] Step S500 includes obtaining the actual temperature of the oven and determining whether the actual temperature is equal to the original set temperature corresponding to the oven.

[0070] S501, if the oven temperature detection is passed, the temperature adjustment process is directly ended.

[0071] Wherein, if the oven temperature detection is passed, it means that the actual temperature of the oven is equal to the original set temperature corresponding to the oven.

[0072] S502, if the oven temperature detection is not passed, it is determined whether the total number of adjustments of the oven is >N.

[0073] The oven temperature detection is not passed, which means that the actual temperature of the oven is greater than or less than the original set temperature corresponding to the oven, and N represents a preset threshold.

[0074] S503, if the total number of adjustments of the oven is >N, it is determined that the oven is faulty, an alarm is given and the oven is shut down.

[0075] S504, if the total number of adjustments of the oven is ≤N, the temperature automatic adjustment is entered, the compensation set temperature of the oven is determined, and N=N+1 is determined at the same time.

[0076] S505, the temperature adjustment signal is determined according to the compensation set temperature.

[0077] S506, proportional valve opening adjustment is performed according to the temperature adjustment signal, and S500 is returned.

[0078] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system and the device described above can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here. In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interfaces, devices or units, and can be electrical, mechanical or other forms.

[0079] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., they can be located in one place or distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0080] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0081] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or the parts of the technical solutions can be embodied in the form of software products, and the computer software products are stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, and various program code storage media.

[0082] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and 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. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A temperature control method, applied to a temperature control system, characterized in that: The temperature control system includes a coating machine, a temperature control meter, a programmable logic controller and a plurality of proportional valves. The coating machine includes a plurality of oven sections, each oven section is connected to a corresponding proportional valve, and each oven section has a built-in thermocouple. The method comprises: The temperature control meter determines the actual temperature of the oven to which each thermocouple belongs based on the received temperature information corresponding to each thermocouple and sends the result to the programmable logic controller; The programmable logic controller performs the following temperature compensation processing on the received actual temperature of each oven: compares the actual temperature corresponding to the oven with the original set temperature corresponding to the oven, actively performs temperature compensation on the oven based on the comparison result, determines the compensated set temperature and sends it to the temperature control table, wherein the compensated set temperature refers to the sum of the original set temperature corresponding to the oven and the temperature compensation value, and the temperature compensation value refers to the absolute value of the difference between the actual temperature and the original set temperature; The temperature control table determines whether the compensation set temperature corresponding to each oven receives satisfies a temperature adjustment condition, wherein the difference between the compensation set temperature corresponding to the oven and the actual temperature is equal to twice the temperature compensation value; If the compensation set temperature corresponding to the oven meets the temperature adjustment condition, a corresponding temperature adjustment signal is determined according to the compensation set temperature and the actual temperature of the oven and transmitted to the proportional valve corresponding to the oven; For each proportional valve, the proportional valve controls the valve to open to the valve opening indicated by the received temperature adjustment signal, so as to complete the temperature adjustment of the oven corresponding to the proportional valve; The method further comprises: The temperature control meter receives the compensation set temperature of each oven, transmits the temperature adjustment signal corresponding to the oven to the proportional valve corresponding to the oven, and generates the adjustment accumulation signal corresponding to the oven and sends it to the programmable logic controller; The programmable logic controller accumulates the number of temperature adjustments of each oven based on the received adjustment accumulation signal corresponding to the oven, and determines the total number of adjustments corresponding to the oven; The programmable logic controller performs alarm processing for each oven: if the total number of adjustments corresponding to the oven is less than or equal to a preset threshold, the oven is not faulty and no alarm is issued; if the total number of adjustments corresponding to the oven is greater than the preset threshold, the oven is faulty, an alarm is issued, and the oven is shut down.

2. The method according to claim 1, characterized in that The temperature information carries the thermocouple model identification and hot end voltage value, The temperature control table determines the actual temperature of the oven to which each thermocouple belongs by the following method: According to the thermocouple model identifier corresponding to the thermocouple, the cold junction voltage value corresponding to the thermocouple is retrieved from a preset thermocouple information table, wherein the preset thermocouple information table records a mapping relationship between multiple thermocouple model identifiers and multiple cold junction voltage values; The potential difference between the hot-end voltage value and the cold-end voltage value corresponding to the thermocouple is calculated, and the actual temperature of the oven to which the thermocouple belongs is determined based on the potential difference and a pre-acquired first proportional function, where the first proportional function indicates a proportional relationship between the potential difference and the temperature value.

3. The method according to claim 1, characterized in that The programmable logic controller determines the compensation set temperature corresponding to each oven section in the following manner: Determining whether the comparison result corresponding to the oven satisfies a temperature compensation condition, where the temperature compensation condition is that the actual temperature of the oven is greater than or less than an original set temperature corresponding to the oven; If the comparison result corresponding to the oven meets the temperature compensation condition, determining the compensation set temperature corresponding to the oven, and performing temperature compensation on the oven; If the comparison result corresponding to the oven does not meet the temperature compensation condition, no temperature compensation is performed on the oven, and the actual temperature corresponding to the oven is received again.

4. The method according to claim 3, characterized in that Before determining the compensation set temperature corresponding to each oven section, the temperature control table performs the following processing for the received compensation set temperature of each oven section: If the compensation set temperature corresponding to the oven does not meet the temperature adjustment condition, the process returns to re-collect the actual temperature corresponding to the oven.

5. The method according to claim 1, wherein The temperature control table determines the temperature adjustment signal corresponding to each oven section in the following manner: Determine the difference between the compensation set temperature and the actual temperature corresponding to the oven; A second proportional function is used to perform PID conversion on the difference between the compensated set temperature and the actual temperature corresponding to the oven to determine a temperature adjustment signal corresponding to the oven, wherein the temperature adjustment signal indicates a current signal, and the second proportional function indicates a proportional relationship between the difference between the compensated set temperature and the actual temperature and the current signal.

6. The method according to claim 5, characterized in that Each proportional valve adjusts the temperature of the oven corresponding to the proportional valve in the following ways: The proportional valve acquires a third proportional function, wherein the third proportional function indicates a proportional relationship between the current signal and the valve opening; The third proportional function and the current signal indicated by the temperature adjustment signal received by the proportional valve are used to control the proportional valve to open to the valve opening indicated by the temperature adjustment signal, so as to complete the temperature adjustment of the oven corresponding to the proportional valve.

7. A temperature control system, characterized in that: The temperature control system includes a coating machine, a temperature control meter, a programmable logic controller and a plurality of proportional valves. The coating machine includes a plurality of oven sections, each oven section is connected to a corresponding proportional valve, and each oven section has a built-in thermocouple. Wherein, the temperature control meter determines the actual temperature of the oven to which each thermocouple belongs based on the received temperature information corresponding to each thermocouple and sends the result to the programmable logic controller; The programmable logic controller performs the following temperature compensation processing on the received actual temperature of each oven: compares the actual temperature corresponding to the oven with the original set temperature corresponding to the oven, actively performs temperature compensation on the oven based on the comparison result, determines the compensated set temperature and sends it to the temperature control table, wherein the compensated set temperature refers to the sum of the original set temperature corresponding to the oven and the temperature compensation value, and the temperature compensation value refers to the absolute value of the difference between the actual temperature and the original set temperature; The temperature control table determines whether the compensation set temperature corresponding to each oven receives satisfies a temperature adjustment condition, wherein the difference between the compensation set temperature corresponding to the oven and the actual temperature is equal to twice the temperature compensation value; If the compensation set temperature corresponding to the oven meets the temperature adjustment condition, a corresponding temperature adjustment signal is determined according to the compensation set temperature and the actual temperature of the oven and transmitted to the proportional valve corresponding to the oven; For each proportional valve, the proportional valve controls the valve to open to the valve opening indicated by the received temperature adjustment signal, so as to complete the temperature adjustment of the oven corresponding to the proportional valve; The temperature control meter receives the compensation set temperature of each oven, transmits the temperature adjustment signal corresponding to the oven to the proportional valve corresponding to the oven, and generates the adjustment accumulation signal corresponding to the oven and sends it to the programmable logic controller; The programmable logic controller accumulates the number of temperature adjustments of each oven based on the received adjustment accumulation signal corresponding to the oven, and determines the total number of adjustments corresponding to the oven; The programmable logic controller performs alarm processing for each oven: if the total number of adjustments corresponding to the oven is less than or equal to a preset threshold, the oven is not faulty and no alarm is issued; if the total number of adjustments corresponding to the oven is greater than the preset threshold, the oven is faulty, an alarm is issued, and the oven is shut down.

8. The temperature control system according to claim 7, characterized in that: The temperature information carries the thermocouple model identification and hot end voltage value, The temperature control table retrieves the cold-end voltage value corresponding to the thermocouple from a preset thermocouple information table according to the thermocouple model identifier corresponding to the thermocouple, and the preset thermocouple information table records the mapping relationship between multiple thermocouple model identifiers and multiple cold-end voltage values; The temperature control meter calculates the potential difference between the hot end voltage value and the cold end voltage value corresponding to the thermocouple, and determines the actual temperature of the oven to which the thermocouple belongs based on the potential difference and a pre-acquired first proportional function, where the first proportional function indicates the proportional relationship between the potential difference and the temperature value.

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