An iodine adding device for salt production

Abstract

The present invention relates to the technical field of salt production, and in particular to an iodizing device for salt production. The weight of salt and the flow rate of iodine solution are monitored in real time through a gravity sensor and a flow rate sensor on a salt feeding mechanism and an iodine solution feeding mechanism, so as to provide a basis for accurately controlling the flow rate of iodine solution and the rotation speed of a stirring motor. Considering the influence of salt quality fluctuation on the demand for iodine solution, the matching degree of the data of the two is analyzed, and the flow rate of iodine solution and the rotation speed of a stirring motor are dynamically adjusted. On the basis of analyzing the instantaneous error, the accumulated historical error and the adjustment value are also analyzed, and the correction strategy is flexibly selected to cope with different error situations. According to different correction strategies, the current and historical errors and adjustment values ​​are integrated, and the current iodine solution flow rate and the rotation speed of the stirring motor are accurately calculated to ensure that the iodine solution flow rate is accurately matched with the stirring force of the motor and the weight change of salt. This method improves the uniformity and effect of salt iodization, and realizes dynamic and intelligent salt iodization control.

Description

Technical Field

[0001] The invention relates to the technical field of salt production, and in particular to an iodizing device used for salt production. Background Art

[0002] Iodine is an essential trace element for the human body. It plays a key role in the synthesis of thyroid hormones and has an important impact on children's intellectual development. Iodine deficiency is a serious health problem that may lead to endemic goiter, cretinism, and affect children's intellectual development. In order to prevent health problems related to iodine deficiency, iodization of table salt has become a widely adopted public health measure.

[0003] At present, the process of iodizing salt is to determine the required volume of iodine solution based on the weight of the salt, thereby controlling the flow rate of the iodine solution at a uniform speed, and mixing the two in an iodized salt mixing box using a fixed stirring force; however, in actual operation, since the salt is a solid particle, it is easily affected by other factors such as particle size, volume, and bulk density during the falling process, resulting in changes in the weight of the salt entering the iodized salt mixing box per unit time. If the iodization and mixing operations are still performed at a uniform iodine liquid flow rate and a fixed stirring force, the fixed iodine liquid flow rate and stirring force will not match the dynamic changes in the weight of the salt, resulting in uneven iodine content in the salt, affecting the effect of iodizing the salt. Summary of the invention

[0004] In order to solve the problem that the fixed iodine liquid flow rate and stirring force do not match the dynamic change of salt weight when performing iodine addition and mixing operations with a uniform iodine liquid flow rate and a fixed stirring force, thereby causing uneven iodine content in salt and affecting the effect of iodization of salt, the object of the present invention is to provide an iodization device for salt production, and the technical scheme adopted is as follows:

[0005] The invention proposes an iodizing device for salt production, comprising a salt iodizing device body, wherein the salt iodizing device body comprises a salt feeding mechanism, an iodine liquid feeding mechanism, an iodized salt mixing box and an iodized salt conveying mechanism; a gravity sensor is installed on the salt feeding mechanism, a flow rate sensor is installed on the iodine liquid feeding mechanism, and a stirring motor is installed on the iodized salt mixing box, wherein the gravity sensor is used to obtain salt weight time series data in the salt feeding mechanism, and the flow rate sensor is used to obtain iodine liquid flow rate time series data in the iodine liquid feeding mechanism; the iodizing device for salt production is further provided with a control module, wherein the control module is used to realize a control method for controlling the flow rate of the iodine liquid feeding mechanism and the rotation speed of the stirring motor according to the salt weight time series data and the iodine liquid flow rate time series data; wherein the control method comprises:

[0006] Obtaining salt weight time series data and iodine solution flow rate time series data;

[0007] In the salt weight time series data and the iodine liquid flow rate time series data, according to the change of the salt weight value and the change of the iodine liquid flow rate value between different moments, calculate the instantaneous error value and the instantaneous adjustment value of the iodine liquid flow rate at each moment;

[0008] Comprehensively analyzing the instantaneous error value and the instantaneous adjustment value of the iodine solution flow rate at the current moment and all previous moments, and determining the cumulative error value and the cumulative adjustment value at the current moment;

[0009] Different correction strategies are determined based on the accumulated error value and the instantaneous error value at the current moment; according to different correction strategies, different indicators are selected from the accumulated error value, the accumulated adjustment value, the instantaneous error value and the instantaneous adjustment value at the current moment, and the iodine liquid flow rate value and the speed value of the stirring motor at the previous moment before the current moment are respectively fused and calculated, so as to determine the iodine liquid flow rate value and the speed value of the stirring motor after the current moment.

[0010] Furthermore, the method for obtaining the instantaneous error value includes:

[0011] For any moment, the absolute value of the difference between the salt weight value at that moment and the salt weight value at the previous moment is taken as the salt change at that moment;

[0012] The product of the iodine liquid flow rate value at the last moment at this moment and the time interval between this moment and the last moment is used as the iodine liquid variation at this moment;

[0013] The corresponding standard iodine solution volume is determined according to the change in salt at that moment, the absolute value of the difference between the standard iodine solution volume and the change in iodine solution is used as the error factor of the iodine solution flow rate at that moment, and the ratio of the error factor to the standard iodine solution volume is used as the instantaneous error value of the iodine solution flow rate at that moment.

[0014] Furthermore, the method for obtaining the instant adjustment value includes:

[0015] At any moment, the difference between the volume of the standard iodine solution and the change in the iodine solution at that moment is analyzed using a sign function to calculate the instant adjustment value corresponding to that moment.

[0016] Furthermore, the method for obtaining the accumulated error value includes:

[0017] All moments before the current moment are used as comparison moments, and the instant error value is weightedly fused using the comparison moment and the instant adjustment value of the current moment to obtain the comprehensive difference corresponding to the current moment, and the absolute value of the comprehensive difference is used as the cumulative error value corresponding to the current moment.

[0018] Furthermore, the method for obtaining the cumulative adjustment value includes:

[0019] The symbol function is used to analyze the comprehensive difference at the current moment and calculate the cumulative adjustment value corresponding to the current moment.

[0020] Furthermore, the different correction strategies are determined based on the accumulated error value and the instantaneous error value at the current moment, including:

[0021] In the case where the cumulative error value at the current moment is less than or equal to the preset cumulative error threshold value: if the instantaneous error value at the current moment is less than or equal to the preset instantaneous error threshold value, the correction strategy at the current moment is correction strategy one: based on the iodine liquid flow rate value at the previous moment and the speed value of the stirring motor at the current moment, the iodine liquid flow rate value and the speed value of the stirring motor after the current moment are determined; if the instantaneous error value at the current moment is greater than the preset instantaneous error threshold value, the correction strategy at the current moment is correction strategy two: based on the instantaneous error value and the instantaneous adjustment value at the current moment, the iodine liquid flow rate value and the speed value of the stirring motor after the current moment are determined;

[0022] When the cumulative error value at the current moment is greater than the preset cumulative error threshold, if the instantaneous error value at the current moment is less than or equal to the preset instantaneous error threshold, the correction strategy at the current moment is correction strategy three: based on the cumulative error value and the cumulative adjustment value at the current moment, the iodine liquid flow rate value and the speed value of the stirring motor after the current moment are determined; if the instantaneous error value at the current moment is greater than the preset instantaneous error threshold, the correction strategy at the current moment is correction strategy four: based on the cumulative error value, the cumulative adjustment value, the instantaneous error value and the instantaneous adjustment value at the current moment, the iodine liquid flow rate value and the speed value of the stirring motor after the current moment are determined.

[0023] Further, in the correction strategy, the method for obtaining the iodine solution flow rate value and the speed value of the stirring motor after the current moment includes:

[0024] The iodine liquid flow rate value at the previous moment before the current moment is used as the iodine liquid flow rate value after the current moment; the speed value of the stirring motor at the previous moment before the current moment is used as the speed value of the stirring motor after the current moment.

[0025] Further, under the second correction strategy, the method for obtaining the iodine solution flow rate value and the speed value of the stirring motor after the current moment includes:

[0026] The product of the instant error value and the instant adjustment value at the current moment and the sum of the preset constant are used as the second flow rate adjustment degree value, and the product of the second flow rate adjustment degree value and the iodine liquid flow rate value at the previous moment of the current moment is used as the iodine liquid flow rate value after the current moment;

[0027] The sum of the instantaneous error value at the current moment and the preset constant is used as the second speed adjustment degree value, and the product of the second speed adjustment degree value and the speed value of the stirring motor at the previous moment before the current moment is used as the speed value of the stirring motor after the current moment.

[0028] Further, under correction strategy three, the method for obtaining the iodine solution flow rate value and the speed value of the stirring motor after the current moment includes:

[0029] The product of the accumulated error value and the accumulated adjustment value at the current moment and the sum of the preset constant are used as the third flow rate adjustment value, and the product of the third flow rate adjustment value and the iodine liquid flow rate value at the previous moment before the current moment is used as the iodine liquid flow rate value after the current moment;

[0030] The sum of the accumulated error value at the current moment and the preset constant is taken as the third speed adjustment degree value, and the product of the third speed adjustment degree value and the speed value of the stirring motor at the previous moment before the current moment is taken as the speed value of the stirring motor after the current moment.

[0031] Further, under the correction strategy 4, the method for obtaining the iodine solution flow rate value and the speed value of the stirring motor after the current moment includes:

[0032] The sum of the product of the accumulated error value and the accumulated adjustment value at the current moment, the product of the immediate error value and the immediate adjustment value at the current moment, and the preset constant is used as the fourth flow rate adjustment value, and the product of the fourth flow rate adjustment value and the iodine liquid flow rate value at the previous moment before the current moment is used as the iodine liquid flow rate value after the current moment;

[0033] The sum of the accumulated error value at the current moment, the instantaneous error value at the current moment, and the preset constant is used as the fourth speed adjustment degree value, and the product of the fourth speed adjustment degree value and the speed value of the stirring motor at the previous moment before the current moment is used as the speed value of the stirring motor after the current moment.

[0034] The present invention has the following beneficial effects:

[0035] By installing gravity sensor and flow rate sensor respectively on salt feeding mechanism and iodine liquid feeding mechanism, for obtaining salt weight time series data and iodine liquid flow rate time series data, the weight change of salt and the flow rate of iodine liquid can be monitored in real time, and data basis is provided for subsequent iodine liquid flow rate control and the speed control of stirring motor. Because salt is easily affected by other factors such as particle size, volume, bulk density in the falling process, the mass change of salt in different unit time fluctuates, and the iodine liquid volume corresponding to different salt masses is also different, so based on the change of salt weight value between different moments and the change of iodine liquid flow rate value, by analyzing whether the change of both situations matches, thus determine the instant error value of iodine liquid flow rate at each moment and the instant adjustment value of iodine liquid flow rate. For the current moment, due to the error situation corresponding to all moments before it, there will be a cumulative effect, so the instant error value and the instant adjustment value of iodine liquid flow rate at the current moment and all moments before are comprehensively analyzed, and the cumulative error value and the cumulative adjustment value at the current moment are obtained. Finally, different correction strategies are used to control the iodine liquid flow rate and the speed of the stirring motor according to the cumulative error value and the instant error value. This correction strategy selection mechanism can flexibly handle errors in different situations, ensuring that the subsequent control adjustment process is more targeted. After determining different correction strategies, according to the needs of the correction strategy, different indicators are selected in the cumulative error value, cumulative adjustment value, instant error value and instant adjustment value at the current moment to respectively perform fusion calculation on the iodine liquid flow rate value and the speed value of the stirring motor at the previous moment of the current moment, thereby determining the iodine liquid flow rate value and the speed value of the stirring motor after the current moment, by selecting different indicators under different correction strategies for fusion calculation, it is better to match the dynamic changes of the iodine liquid flow rate and the stirring intensity with the weight of salt, accurately determine the iodine liquid flow rate value and the speed value of the stirring motor at the current moment, thereby effectively improving the uniformity of the iodine content of salt and the effect of iodizing salt. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 An overall structural diagram of an iodization device for salt production provided by one embodiment of the present invention;

[0038] Figure 2 A schematic diagram of the structure of a control module provided by an embodiment of the present invention;

[0039] Figure 3 A method flow chart of a control method for controlling the flow velocity of an iodine liquid feeding mechanism and the rotation speed of a stirring motor provided by one embodiment of the present invention;

[0040] Figure numerals: 1-salt feed port; 2-salt quantitative container; 3-iodized salt feed port; 4-iodized salt mixing box; 5-iodized salt discharge port; 6-conveyor belt; 7-gravity sensor; 8-salt discharge port; 9-stirring motor; 10-iodine liquid quantitative container; 11-flow rate sensor; 12-control module. DETAILED DESCRIPTION

[0041] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the iodization device for salt production proposed by the present invention, its specific implementation, structure, characteristics and effects, in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0042] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0043] The specific scheme of an iodization device for salt production provided by the present invention is described in detail below with reference to the accompanying drawings.

[0044] See also Figure 1 , which shows an overall structural diagram of an iodizing device for salt production provided by an embodiment of the present invention, including a salt iodizing device body, wherein the salt iodizing device body includes a salt feeding mechanism, an iodine liquid feeding mechanism, an iodized salt mixing box 4 and an iodized salt conveying mechanism; wherein the salt feeding mechanism includes a salt feeding port 1, a salt quantitative container 2, and a salt discharge port 8; the iodine liquid feeding mechanism includes an iodine liquid quantitative container 10, an iodine liquid nozzle (not shown in the figure) connected to the iodine liquid quantitative container and installed inside the iodized salt mixing box 4; the iodized salt mixing box 4 includes a stirring motor 9, a control module 12, an iodized salt feeding port 3, and an iodized salt discharge port 5, the stirring motor 9 is used to control a stirring rod (not shown in the figure) inside the iodized salt mixing box 4 to mix the salt and the iodized liquid; the iodized salt conveying mechanism includes a conveyor belt 6.

[0045] In this embodiment of the present invention, in order to control the rotating speed of iodine liquid flow velocity and stirring motor 9 according to the matching situation between the flow velocity of the quality change of salt and iodine liquid, so on the salt feeding mechanism, gravity sensor 7 is installed, is used to obtain the salt weight time series data, on the iodine liquid feeding mechanism, flow rate sensor 11 is installed, is used to obtain the iodine liquid flow velocity time series data.In the salt iodization process, at first close the salt discharging port 8, in the salt quantitative container 2, add salt by the salt feeding port 1 of the salt feeding mechanism, and obtain the iodine liquid capacity required in theory according to the quality of the added salt, add in the iodine liquid quantitative container 10 of the iodine liquid feeding mechanism. Then the iodized salt discharge port 5 is closed, the iodized salt feed port 3 is opened, and the salt discharge port 8 is opened. The control module 12 realizes the control method of controlling the flow rate of the iodine liquid nozzle in the iodine liquid feeding mechanism and the speed of the stirring motor 9 according to the obtained salt weight time series data and the iodine liquid flow rate time series data, and the stirring rod controlled by the stirring motor 9 is used to fully stir the salt and iodine liquid in the iodized salt mixing box 4, thereby completing the salt iodization operation, and finally the iodized salt discharge port 5 is opened, and the uniformly mixed iodized salt is conveyed by the conveyor belt 6 of the iodized salt conveying mechanism. The initial parameters of the device are set: the flow rate of the salt (i.e., the mass change of the salt per unit time) is set according to the empirical value and the opening size of the salt discharge port 8 is adjusted; the iodine liquid flow rate of the iodine liquid nozzle in the iodine liquid feeding mechanism is set according to the iodine liquid volume required for the iodine liquid mass change per unit time in theory, so that the flow rate of the iodine liquid matches the change of the salt in the initial state; the speed of the stirring motor 9 is set to the minimum speed. It should be noted that, in the initial state, the salt flow rate can be set to 1000g / s. The iodine solution flow rate is calculated according to the lowest standard 20mg / kg in the iodine addition standard of 20~30mg / kg and the iodine concentration in the iodine solution. For example, when the iodine solution concentration is 500mg / ml, the iodine solution flow rate can be set to 0.04ml / s, and the minimum speed is set to 5rps. The settings of each initial parameter can be adjusted according to the implementation scenario (such as the density of the iodine solution and the iodine addition standard, etc.), and are not limited here.

[0046] It should be noted that, in other embodiments of the present invention, the main body of the salt iodization device can also be an existing experimental iodization device, including a salt feeding mechanism, an iodine liquid feeding mechanism, an iodized salt mixing box and an iodized salt conveying mechanism.

[0047] The control module 12 includes at least a memory and a processor, see Figure 2, which shows a structural schematic diagram of a control module provided in one embodiment of the present invention, including a processor 200, a memory 201, a bus 202 and a communication interface 203, wherein the processor 200, the communication interface 203 and the memory 201 are connected via the bus 202; wherein the memory 201 may include a high-speed random access memory, the bus 202 may be an ISA bus, a PCI bus or an EISA bus, etc., and the processor 200 may be an integrated circuit chip with a signal processing capability; at least one instruction, at least one program, a code set or an instruction set is stored in the memory 201, and when the at least one instruction, at least one program, a code set or an instruction set is loaded and executed by the processor, a step in a control method for controlling the flow rate of an iodine liquid feeding mechanism and the rotation speed of a stirring motor 9 is implemented.

[0048] See also Figure 3 , which shows a method flow chart of a control method for controlling the flow rate of an iodine liquid feeding mechanism and the speed of a stirring motor 9 provided by an embodiment of the present invention, the method comprising the following steps:

[0049] Step S1: Obtaining salt weight time series data and iodine solution flow rate time series data.

[0050] Because the uniformity of iodine content in iodized salt is closely related to the matching degree of salt quality and iodine liquid volume, so obtain the salt weight according to the gravity sensor 7 in the iodizing device for salt production, and the salt weight is arranged in time sequence to obtain the salt weight time series data, utilize the flow velocity sensor 11 in the iodizing device for salt production to obtain the iodine liquid flow velocity, and the iodine liquid flow velocity is arranged in time sequence to obtain the iodine liquid flow velocity time series data. Based on the aforementioned two kinds of data, the error situation of the iodine liquid flow velocity at each moment can be analyzed in real time, thereby for determining the iodine liquid flow velocity value at the current moment and the speed value of the stirring motor 9 provide data support.

[0051] It should be noted that the time interval for data collection by the flow velocity sensor 11 and the gravity sensor 7 can be set to 1 s. The specific time interval can be adjusted according to the implementation scenario and is not limited here.

[0052] Step S2: In the salt weight time series data and the iodine liquid flow rate time series data, according to the changes in the salt weight value and the iodine liquid flow rate value between different moments, calculate the instantaneous error value and the instantaneous adjustment value of the iodine liquid flow rate at each moment.

[0053] In order to ensure that the iodine content of iodized salt shows a strong uniformity throughout the entire mixing process, the edible salt and iodine solution mixed during the entire mixing process need to be confirmed whether the content matches. In order to ensure that the iodine content of the final iodized salt is more uniform, it is necessary to calculate the instantaneous error value of the iodine liquid flow rate at each moment and the instantaneous adjustment value of the iodine liquid flow rate at each moment in the salt weight time series data and the iodine liquid flow rate time series data according to the changes in the salt weight value and the iodine liquid flow rate value between different moments, so as to improve the uniformity of subsequent mixing.

[0054] Preferably, in one embodiment of the present invention, the method for obtaining the instant error value and the instant adjustment value includes:

[0055] For any moment, the absolute value of the difference between the weight of salt at that moment and the weight of salt at the previous moment is taken as the change in salt at that moment. The change in salt represents the mass of salt involved in the production of iodized salt per unit time.

[0056] The product of the iodine liquid flow rate value at the previous moment and the time interval between the current moment and the previous moment is taken as the iodine liquid change at the current moment.

[0057] Then, the corresponding standard iodine solution volume is determined according to the change in salt at that moment (obtained by the minimum standard of the iodine addition standard and the concentration of iodine in the iodine solution), and the absolute value of the difference between the standard iodine solution volume and the change in iodine solution is used as the error factor of the iodine solution flow rate at that moment. The larger the error factor, the greater the deviation between the iodine solution change (the iodine solution volume added to the iodine-salt mixing box 4) at that moment and the standard iodine solution volume corresponding to the salt change; finally, the ratio of the error factor to the standard iodine solution volume is used as the instantaneous error value of the iodine solution flow rate at that moment. The instantaneous error value characterizes the degree of deviation of the iodine solution flow rate from the standard situation in the form of a relative value, and the larger the instantaneous error value, the greater the degree of deviation.

[0058] Then, the instant adjustment value at that moment is obtained: the difference between the standard iodine solution volume and the iodine solution change at that moment is analyzed using a sign function, thereby calculating the instant adjustment value corresponding to that moment, and the instant adjustment value represents the adjustment direction of the iodine solution flow rate at that moment. The formula model of the instant adjustment value includes:

[0059]

[0060] in, Indicates the instant adjustment value corresponding to each moment; Indicates the change in the amount of iodine solution at each moment; Indicates the volume of standard iodine solution corresponding to the change in salt at each moment; Represents a symbolic function.

[0061] In the formula model of the instant adjustment value, if the volume of the standard iodine solution is greater than the change in the iodine solution, the instant adjustment value corresponding to this moment is 1, indicating that in the unit time period between this moment and the previous moment, the volume of iodine solution added is less than the volume of iodine solution required for the change in salt, then the iodine solution flow rate at this moment should be increased compared with the iodine solution flow rate at the previous moment; if the volume of the standard iodine solution is less than the change in the iodine solution, indicating that in the unit time period between this moment and the previous moment, the volume of iodine solution added is greater than the volume of iodine solution required for the change in salt, then the instant adjustment value corresponding to this moment is -1, that is, the iodine solution flow rate at this moment should be decreased compared with the iodine solution flow rate at the previous moment; if the volume of the standard iodine solution is equal to the change in the iodine solution, then the instant adjustment value corresponding to this moment is 0, indicating that in the unit time period between this moment and the previous moment, the volume of iodine solution added is equal to the volume of iodine solution required for the change in salt, that is, the iodine solution flow rate at this moment can be consistent with the iodine solution flow rate at the previous moment.

[0062] At this point, the instantaneous error value and instantaneous adjustment value of the iodine solution flow rate at each moment can be obtained.

[0063] Step S3: Comprehensively analyzing the instantaneous error value and the instantaneous adjustment value of the iodine solution flow rate at the current moment and all previous moments, and determining the cumulative error value and the cumulative adjustment value at the current moment.

[0064] In a dynamic control system, the error or adjustment at a single moment may not be enough to fully reflect the overall state of the system; That is, due to the flow matching of iodine liquid flow velocity and salt at different times, there is a certain difference, so that the matching situation of the two in a single time period can not reflect the matching situation that the iodine liquid in the iodized salt mixing box 4 and the salt are mixed. Simultaneously, the mixed error of multiple time periods will accumulate in the iodized salt mixing box 4, so if only relying on the error situation at a single moment, the iodine liquid flow rate of addition is judged inaccurate. So by the instant error value of the iodine liquid flow velocity at the current moment and all previous moments and the instant adjustment value of the iodine liquid flow velocity, the cumulative effect of the error situation and the adjustment situation in time can be assessed, the cumulative error value and the cumulative adjustment value at the current moment are obtained, thereby the operation trend of the system is more accurately grasped.

[0065] Preferably, in one embodiment of the present invention, the method for obtaining the cumulative error value and the cumulative adjustment value includes:

[0066] All moments before the current moment are taken as comparison moments, and the instantaneous adjustment values ​​of the comparison moments and the current moment are used to perform weighted fusion on the instantaneous error values ​​to obtain the cumulative error value corresponding to the current moment: when the instantaneous adjustment value is a positive value of 1, it indicates that the iodine liquid flow rate should be increased; when the instantaneous adjustment value is a negative value of -1, it indicates that the iodine liquid flow rate should be decreased; when the instantaneous adjustment value is 0, the iodine liquid flow rate can remain unchanged; and the instantaneous error value characterizes the degree of deviation of the iodine liquid flow rate at each moment from the standard situation, so the product of the instantaneous error value at the current moment and each comparison moment and the corresponding instantaneous adjustment value is taken as the adjustment characteristic value of the current moment and each comparison moment, so as to achieve weighting. Then the adjustment characteristic values ​​of the current moment and all the comparison moments are accumulated to obtain the comprehensive difference at the current moment. If the comprehensive difference is positive and the larger it is, the higher the degree to which the volume of iodine liquid added is less than the volume of iodine liquid required for the change in salt during the time period up to the current moment, the more the iodine liquid flow rate at the current moment needs to be increased. If the cumulative error value is negative and the smaller it is, the higher the degree to which the volume of iodine liquid added is greater than the volume of iodine liquid required for the change in salt during the time period up to the current moment, the more the iodine liquid flow rate at the current moment needs to be decreased. If the cumulative error value is 0, it means that the errors of increasing and decreasing the iodine liquid flow rate can balance each other during the time period up to the current moment. Therefore, using the symbol function By analyzing the comprehensive difference, the cumulative adjustment value at the current moment can be obtained (consistent with the calculation process of the instant adjustment value, which will not be repeated here). At this time, the cumulative adjustment value is a positive value of 1, indicating that the iodine liquid flow rate needs to be increased, and when the cumulative adjustment value is a negative value of -1, it indicates that the iodine liquid flow rate should be reduced, and when the cumulative adjustment value is 0, the iodine liquid flow rate can remain unchanged. Since the comprehensive difference is positive or negative, it indicates that there is a certain error, so the absolute value of the comprehensive difference is used as the cumulative error value. The larger the cumulative error value is, the greater the deviation between the standard situation corresponding to the iodine liquid flow rate and the salt weight is.

[0067] At this point, the accumulated error value and accumulated adjustment value at the current moment can be obtained.

[0068] Step S4: different correction strategies are determined based on the accumulated error value and the instantaneous error value at the current moment; according to different correction strategies, different indicators are selected from the accumulated error value, the accumulated adjustment value, the instantaneous error value and the instantaneous adjustment value at the current moment, and the iodine liquid flow rate value and the speed value of the stirring motor 9 at the previous moment of the current moment are respectively fused and calculated, so as to determine the iodine liquid flow rate value and the speed value of the stirring motor 9 after the current moment.

[0069] After obtaining the instantaneous error value, the instantaneous adjustment value, the cumulative error value and the cumulative adjustment value at the current moment, if the cumulative error value meets the normal error fluctuation, then the iodine liquid flow rate and the rotating speed of the stirring motor 9 at the current moment can be adjusted only by relying on the instantaneous error value. However, if the cumulative error value exceeds the normal error fluctuation, if the cumulative error is not considered at this time, and the iodine liquid flow rate and the rotating speed of the stirring motor 9 are controlled only by the instantaneous error, it may cause the deviation to become larger and larger, so that the iodine content of the final iodized salt is uneven. Therefore, in an embodiment of the present invention, different correction strategies are first judged by the cumulative error value and the instantaneous error value, and then based on different correction strategies, different indicators are selected to participate in the calculation among the cumulative error value, the cumulative adjustment value, the instantaneous error value and the instantaneous adjustment value at the current moment, so as to determine the iodine liquid flow rate value and the rotating speed value of the stirring motor 9 after the current moment (that is, the iodine liquid flow rate value and the rotating speed value of the stirring motor 9 in the unit time between the current moment and the next moment), various uncertain factors can be more effectively dealt with, and the stability of the iodized salt production process is improved.

[0070] Preferably, in one embodiment of the present invention, the method for obtaining the iodine solution flow rate value and the speed value of the stirring motor 9 after the current moment comprises:

[0071] Different correction strategies are determined based on the current cumulative error value and the instantaneous error value, including:

[0072] When the cumulative error value at the current moment is less than or equal to the preset cumulative error threshold value, it is explained that from the overall level, the cumulative error situation at the current moment and the previous moments meets normal error fluctuations, so the iodine liquid flow rate value and the speed value of the stirring motor 9 can be adjusted only by the instant error value at the current moment: at this time, if the instant error value at the current moment is less than or equal to the preset instant error threshold value, it is explained that the instant error value at the current moment also meets normal error fluctuations, so the correction strategy at the current moment is correction strategy one, and in correction strategy one, the acquisition method of the iodine liquid flow rate value and the speed value of the stirring motor 9 after the current moment includes:

[0073] In view of that cumulative error value and instant error value all meet normal error fluctuation, so the iodine liquid flow rate value under the current moment and the speed value of stirring motor 9 all do not need to be adjusted, that is, directly using the iodine liquid flow rate value under the previous moment of the current moment as the iodine liquid flow rate value after the current moment, that is, as the iodine liquid flow rate value in this unit time between the current moment to the next moment; using the speed value of the stirring motor 9 under the previous moment of the current moment as the speed value of the stirring motor 9 after the current moment, that is, as the speed value of the stirring motor 9 in this unit time between the current moment to the next moment.

[0074] If the instantaneous error value at the current moment is greater than the preset instantaneous error threshold, it means that the instantaneous error value does not conform to normal error fluctuations, so the correction strategy at the current moment is correction strategy 2. Under correction strategy 2, the method for obtaining the iodine liquid flow rate value and the speed value of the stirring motor 9 after the current moment includes:

[0075] Because the cumulative error value conforms to the normal error fluctuation, the iodine liquid flow rate value is adjusted using the instantaneous error value and the instantaneous adjustment value at the current moment: the product of the instantaneous error value and the instantaneous adjustment value at the current moment and the sum of the preset constant are used as the second flow rate adjustment degree value. The larger the product of the instantaneous error value and the instantaneous adjustment value is, the less the content of the iodine liquid is compared with the standard iodine liquid volume corresponding to the change in salt in the unit time from the current moment to the previous moment, and the iodine liquid flow rate needs to be increased; the smaller the product of the instantaneous error value and the instantaneous adjustment value is, the more the content of the iodine liquid is compared with the standard iodine liquid volume corresponding to the content of salt in the unit time from the current moment to the previous moment, and the iodine liquid flow rate needs to be decreased. Therefore, the sum of the product and the preset constant 1 is used as the second flow rate adjustment value. At this time, when the iodine liquid flow rate needs to be increased, the second flow rate adjustment value is greater than 1, and when the iodine liquid flow rate needs to be decreased, the second flow rate adjustment value is less than 1. Finally, the product of the second flow rate adjustment degree value and the iodine liquid flow rate value at the previous moment of the current moment is used as the iodine liquid flow rate value after the current moment, that is, as the iodine liquid flow rate value in the unit time between the current moment and the next moment.

[0076] Since in the embodiment of the present invention, the rotation speed of the stirring motor 9 is initially set to the minimum value, in order to make the mixing uniformity higher during the mixing process of the iodine solution and the table salt, it is necessary to increase the stirring force according to the error situation, that is, to increase the rotation speed value of the stirring motor 9. Therefore, the sum of the instantaneous error value at the current moment and the preset constant 1 is used as the second rotation speed adjustment degree value, and the second rotation speed adjustment degree value is greater than 1. Then, the product of the second rotation speed adjustment degree value and the rotation speed value of the stirring motor 9 at the previous moment before the current moment is used as the rotation speed value of the stirring motor 9 after the current moment, that is, as the rotation speed value of the stirring motor 9 in the unit time between the current moment and the next moment.

[0077] When the cumulative error value at the current moment is greater than the preset cumulative error threshold, it means that the error conditions at the current moment and the previous moments do not conform to normal error fluctuations from the overall level. Therefore, in order to ensure that the iodine liquid content and the salt quality can match in the subsequent process, it is necessary to rely on the instantaneous error value at the current moment for further judgment, so as to adjust the iodine liquid flow rate value and the speed value of the stirring motor 9: if the instantaneous error value at the current moment is less than or equal to the preset instantaneous error threshold, it means that the instantaneous error value at the current moment conforms to normal error fluctuations, and the correction strategy at the current moment is correction strategy three. Under correction strategy three, the method for obtaining the iodine liquid flow rate value and the speed value of the stirring motor 9 after the current moment includes:

[0078] Because the cumulative error value does not conform to the normal error fluctuation, the product of the cumulative error value at the current moment and the cumulative adjustment value, and the sum of the preset constant 1, are used as the third flow rate adjustment value. The larger the product of the cumulative error value and the cumulative adjustment value is, the less the content of the iodine solution is compared with the standard iodine solution volume corresponding to the mass of the salt in the time period up to the current moment, and the iodine solution flow rate needs to be increased; the smaller the product of the cumulative error value and the cumulative adjustment value is, the more the content of the iodine solution is compared with the standard iodine solution volume corresponding to the mass of the salt in the time period up to the current moment. The volume of standard iodine solution corresponding to the mass of salt is relatively large, and the iodine solution flow rate needs to be reduced. Therefore, the sum of the product and the preset constant 1 is used as the third flow rate adjustment value. At this time, when the iodine solution flow rate needs to be increased, the third flow rate adjustment value is greater than 1, and when the iodine solution flow rate needs to be reduced, the third flow rate adjustment value is less than 1. The product of the third flow rate adjustment value and the iodine solution flow rate value at the previous moment of the current moment is used as the iodine solution flow rate value after the current moment, that is, as the iodine solution flow rate value in the unit time between the current moment and the next moment.

[0079] Consistent with correction strategy 2, the sum of the accumulated error value at the current moment and the preset constant 1 is used as the third speed adjustment degree value, and the product of the third speed adjustment degree value and the speed value of the stirring motor 9 at the previous moment before the current moment is used as the speed value of the stirring motor 9 after the current moment, that is, as the speed value of the stirring motor 9 in the unit time between the current moment and the next moment.

[0080] If the instantaneous error value at the current moment is greater than the preset instantaneous error threshold, it means that the instantaneous error value does not conform to normal error fluctuations, and the correction strategy at the current moment is correction strategy 4. Under correction strategy 4, the method for obtaining the iodine liquid flow rate value and the speed value of the stirring motor 9 after the current moment includes:

[0081] The product of the cumulative error value and the cumulative adjustment value at the current moment, the product of the instantaneous error value and the instantaneous adjustment value at the current moment, and the sum of the preset constant 1 are used as the fourth flow rate adjustment value. Based on the analysis in correction strategy two and correction strategy three, it can be known that, similarly, when the iodine liquid flow rate needs to be increased, the fourth flow rate adjustment value is greater than 1, and when the iodine liquid flow rate needs to be decreased, the fourth flow rate adjustment value is less than 1. The product of the fourth flow rate adjustment value and the iodine liquid flow rate value at the previous moment before the current moment is used as the iodine liquid flow rate value after the current moment, that is, as the iodine liquid flow rate value in the unit time between the current moment and the next moment.

[0082] Consistent with the analysis of the aforementioned correction strategies two and three, the sum of the accumulated error value at the current moment, the instantaneous error value at the current moment, and the preset constant 1 is taken as the fourth speed adjustment degree value, and the product of the fourth speed adjustment degree value and the speed value of the stirring motor 9 at the previous moment of the current moment is taken as the speed value of the stirring motor 9 after the current moment, that is, as the speed value of the stirring motor 9 in the unit time between the current moment and the next moment.

[0083] It should be noted that the instantaneous error threshold is set to 0.05, and the cumulative error threshold is set to 0.07. The specific values ​​can be adjusted according to the implementation scenario and are not limited here. The purpose of setting the preset constant to 1 is to prevent over-adjustment. In other embodiments, it can be adjusted and is not limited here.

[0084] At this point, the flow rate of the iodine solution and the rotation speed of the stirring motor 9 at each moment in the iodized salt mixing process can be adjusted in real time to ensure that the iodine content of the iodized salt is uniform.

[0085] After all the salt in the salt quantitative container 2 and all the iodine solution in the iodine solution quantitative container have entered the iodine solution mixing box, when stirring and mixing are completed, the iodized salt discharge port 5 is opened, and then the conveyor belt 6 of the iodized salt conveying mechanism is started to transport the salt.

[0086] In summary, by installing gravity sensor 7 and flow rate sensor 11 respectively on salt feeding mechanism and iodine liquid feeding mechanism, be used to obtain salt weight time series data and iodine liquid flow rate time series data, can monitor the weight change of salt and the flow rate of iodine liquid in real time, for follow-up iodine liquid flow rate control and the speed control of stirring motor 9 provide data basis.Because salt is easily affected by other factors such as particle size, volume, bulk density in the falling process, thereby cause the quality change of salt in different unit time to fluctuate, and the iodine liquid volume corresponding to different salt quality also can be different, therefore based on the variation of salt weight value between different moments and the variation of iodine liquid flow rate value, by analyzing whether the variation of both situations mate, thereby determine the instant error value of iodine liquid flow rate and the instant adjustment value of iodine liquid flow rate at each moment.For the current moment, because the error situation corresponding to all moments before it can have a cumulative effect, so comprehensive analysis the instant error value and the instant adjustment value of iodine liquid flow rate at the current moment and all moments before, obtain the cumulative error value and the cumulative adjustment value at the current moment. Finally, according to the accumulated error value and the instant error value, judge the different correction strategies that the rotating speed of iodine liquid flow rate and stirring motor 9 are controlled, this strategy selection mechanism can flexibly handle the error of different situations, and ensure that the subsequent control adjustment process is more targeted. After determining different correction strategies, according to the demand of correction strategies, in the accumulated error value under the current moment, the accumulated adjustment value, the instant error value and the instant adjustment value, select different indexes to carry out fusion calculation to the iodine liquid flow rate value under the previous moment of the current moment and the rotating speed value of stirring motor 9 respectively, thereby determine the iodine liquid flow rate value and the rotating speed value of stirring motor 9 at the current moment, by selecting different indexes to carry out fusion calculation under different correction strategies, can better be aimed at the matching situation of the dynamic change of iodine liquid flow rate and stirring force and salt weight, accurately determine the iodine liquid flow rate value and the rotating speed value of stirring motor 9 after the current moment, thereby effectively improve the uniformity of salt iodine content and the effect of salt iodization.

[0087] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0088] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. An iodizing device for salt production, characterized in that: The iodizing device for salt production comprises a salt iodizing device body, which comprises a salt feeding mechanism, an iodine liquid feeding mechanism, an iodized salt mixing box and an iodized salt conveying mechanism; a gravity sensor is installed on the salt feeding mechanism, a flow rate sensor is installed on the iodine liquid feeding mechanism, and a stirring motor is installed on the iodized salt mixing box, the gravity sensor is used to obtain the salt weight time series data in the salt feeding mechanism, and the flow rate sensor is used to obtain the iodine liquid flow rate time series data in the iodine liquid feeding mechanism; the iodizing device for salt production is also provided with a control module, and the control module is used to realize a control method for controlling the flow rate of the iodine liquid feeding mechanism and the rotation speed of the stirring motor according to the salt weight time series data and the iodine liquid flow rate time series data; wherein the control method comprises: Obtaining salt weight time series data and iodine solution flow rate time series data; In the salt weight time series data and the iodine liquid flow rate time series data, according to the change of the salt weight value and the change of the iodine liquid flow rate value between different moments, calculate the instantaneous error value and the instantaneous adjustment value of the iodine liquid flow rate at each moment; Comprehensively analyzing the instantaneous error value and the instantaneous adjustment value of the iodine solution flow rate at the current moment and all previous moments, and determining the cumulative error value and the cumulative adjustment value at the current moment; Different correction strategies are determined based on the accumulated error value and the instantaneous error value at the current moment; according to different correction strategies, different indicators are selected from the accumulated error value, the accumulated adjustment value, the instantaneous error value and the instantaneous adjustment value at the current moment, and the iodine liquid flow rate value and the speed value of the stirring motor at the previous moment before the current moment are respectively fused and calculated, so as to determine the iodine liquid flow rate value and the speed value of the stirring motor after the current moment.

2. The iodization device for salt production according to claim 1, characterized in that: The method for obtaining the instantaneous error value comprises: For any moment, the absolute value of the difference between the salt weight value at that moment and the salt weight value at the previous moment is taken as the salt change at that moment; The product of the iodine liquid flow rate value at the last moment at this moment and the time interval between this moment and the last moment is used as the iodine liquid variation at this moment; The corresponding standard iodine solution volume is determined according to the change in salt at that moment, the absolute value of the difference between the standard iodine solution volume and the change in iodine solution is used as the error factor of the iodine solution flow rate at that moment, and the ratio of the error factor to the standard iodine solution volume is used as the instantaneous error value of the iodine solution flow rate at that moment.

3. An iodization device for salt production according to claim 2, characterized in that: The method for obtaining the instant adjustment value includes: At any moment, the difference between the volume of the standard iodine solution and the change in the iodine solution at that moment is analyzed using a sign function to calculate the instant adjustment value corresponding to that moment.

4. The iodization device for salt production according to claim 1, characterized in that: The method for obtaining the accumulated error value comprises: All moments before the current moment are used as comparison moments, and the instant error value is weightedly fused using the comparison moment and the instant adjustment value of the current moment to obtain the comprehensive difference corresponding to the current moment, and the absolute value of the comprehensive difference is used as the cumulative error value corresponding to the current moment.

5. The iodization device for salt production according to claim 4, characterized in that: The method for obtaining the cumulative adjustment value includes: The symbol function is used to analyze the comprehensive difference at the current moment and calculate the cumulative adjustment value corresponding to the current moment.

6. The iodization device for salt production according to claim 1, characterized in that: The different correction strategies are determined based on the accumulated error value and the instantaneous error value at the current moment, including: In the case where the cumulative error value at the current moment is less than or equal to the preset cumulative error threshold value: if the instantaneous error value at the current moment is less than or equal to the preset instantaneous error threshold value, the correction strategy at the current moment is correction strategy one: based on the iodine liquid flow rate value at the previous moment and the speed value of the stirring motor at the current moment, the iodine liquid flow rate value and the speed value of the stirring motor after the current moment are determined; if the instantaneous error value at the current moment is greater than the preset instantaneous error threshold value, the correction strategy at the current moment is correction strategy two: based on the instantaneous error value and the instantaneous adjustment value at the current moment, the iodine liquid flow rate value and the speed value of the stirring motor after the current moment are determined; When the cumulative error value at the current moment is greater than the preset cumulative error threshold, if the instantaneous error value at the current moment is less than or equal to the preset instantaneous error threshold, the correction strategy at the current moment is correction strategy three: based on the cumulative error value and the cumulative adjustment value at the current moment, the iodine liquid flow rate value and the speed value of the stirring motor after the current moment are determined; if the instantaneous error value at the current moment is greater than the preset instantaneous error threshold, the correction strategy at the current moment is correction strategy four: based on the cumulative error value, the cumulative adjustment value, the instantaneous error value and the instantaneous adjustment value at the current moment, the iodine liquid flow rate value and the speed value of the stirring motor after the current moment are determined.

7. An iodization device for salt production according to claim 6, characterized in that: In the correction strategy, the method for obtaining the iodine solution flow rate value and the stirring motor speed value after the current moment includes: The iodine liquid flow rate value at the previous moment before the current moment is used as the iodine liquid flow rate value after the current moment; the speed value of the stirring motor at the previous moment before the current moment is used as the speed value of the stirring motor after the current moment.

8. The iodization device for salt production according to claim 6, characterized in that: Under the second correction strategy, the method for obtaining the iodine solution flow rate value and the stirring motor speed value after the current moment includes: The product of the instant error value and the instant adjustment value at the current moment and the sum of the preset constant are used as the second flow rate adjustment degree value, and the product of the second flow rate adjustment degree value and the iodine liquid flow rate value at the previous moment of the current moment is used as the iodine liquid flow rate value after the current moment; The sum of the instantaneous error value at the current moment and the preset constant is used as the second speed adjustment degree value, and the product of the second speed adjustment degree value and the speed value of the stirring motor at the previous moment before the current moment is used as the speed value of the stirring motor after the current moment.

9. The iodization device for salt production according to claim 6, characterized in that: Under correction strategy three, the method for obtaining the iodine solution flow rate value and the stirring motor speed value after the current moment includes: The product of the accumulated error value and the accumulated adjustment value at the current moment and the sum of the preset constant are used as the third flow rate adjustment value, and the product of the third flow rate adjustment value and the iodine liquid flow rate value at the previous moment before the current moment is used as the iodine liquid flow rate value after the current moment; The sum of the accumulated error value at the current moment and the preset constant is taken as the third speed adjustment degree value, and the product of the third speed adjustment degree value and the speed value of the stirring motor at the previous moment before the current moment is taken as the speed value of the stirring motor after the current moment.

10. The iodization device for salt production according to claim 6, characterized in that: Under correction strategy 4, the method for obtaining the iodine solution flow rate value and the stirring motor speed value after the current moment includes: The sum of the product of the accumulated error value and the accumulated adjustment value at the current moment, the product of the immediate error value and the immediate adjustment value at the current moment, and the preset constant is used as the fourth flow rate adjustment value, and the product of the fourth flow rate adjustment value and the iodine liquid flow rate value at the previous moment before the current moment is used as the iodine liquid flow rate value after the current moment; The sum of the accumulated error value at the current moment, the instantaneous error value at the current moment, and the preset constant is used as the fourth speed adjustment degree value, and the product of the fourth speed adjustment degree value and the speed value of the stirring motor at the previous moment before the current moment is used as the speed value of the stirring motor after the current moment.

Images