Grain drying control device

Abstract

The present invention provides a grain drying control device 1 that can prevent cracking due to over-drying or uneven drying due to insufficient drying, thereby achieving a high yield. [Solution] The grain drying control device 1 comprises a storage chamber 11 in which grains containing multiple layers with different moisture values ​​are stored, a moisture sensor 3 for detecting the moisture value of the grains in each layer, a drying unit 12 for drying the grains from the storage chamber 11 with hot drying air, a rotary valve 2 for dispensing the grains from the drying unit 12 while rotating, and a drying control unit 5 for controlling the rotation of the rotary valve 2. The drying control unit 5 uses the moisture sensor 3 to measure the moisture value of the grains in each layer during one circulation of the grains in the storage chamber 11 and the drying unit 12. Based on the results of the moisture value measurement in each layer during the circulation of the grains, the device is configured to decelerate the rotary valve 2 if the number of grains with a moisture value of 18% or less is less than 10%, and to increase the speed of the rotary valve 2 if the number of grains with a moisture value of 18% or less is 10% or more.

Description

【Technical Field】 【0001】 The present invention relates to a grain drying control device, particularly a grain drying control device that sequentially performs hot air drying in a drying section while circulating the grains charged into a storage chamber. 【Background Art】 【0002】 Conventionally, as a grain drying control device, for example, while circulating the charged grains once, the degree of moisture unevenness is grasped from the vertical moisture value distribution of the charged grains obtained by measuring the moisture value of the grains, and the planned circulation time required to converge this moisture unevenness within a predetermined width by circulating the grains is calculated, and a grain drying control device characterized by performing a circulation drying operation at a drying speed that reaches the drying target moisture within this planned circulation time has been proposed (see Patent Document 1). 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2009-156481 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 Generally, particularly in a large-scale grain drying control device, grains in various moisture states from a plurality of fields are stored (charged) in a storage chamber, and the grains in the storage chamber may have a vertical moisture distribution formed between grain layers corresponding to different fields and a moisture distribution (moisture unevenness) due to the grains within the layer corresponding to the same field. 【0005】 Since the grain drying control device disclosed in Patent Document 1 uses only the representative value (average value) of the moisture in each grain layer as a condition for operation control, moisture unevenness due to the grains within the layer is not considered. For example, when a large amount of low-moisture and high-moisture grains are contained within the layer, there are problems such as an increase in cracked kernels due to over-drying or rapid drying, or a decrease in yield due to the occurrence of drying unevenness due to insufficient drying. 【0006】 The present invention has been made in view of the above, and its objective is to provide a grain drying control device that can prevent cracking due to over-drying or uneven drying due to insufficient drying, even when there are variations in moisture content in the grain within the grain drying control device in the longitudinal direction and within the layers. [Means for solving the problem] 【0007】 To achieve the above objectives, the following solutions were implemented for grain drying control devices. 【0008】 The first invention relates to a grain drying control device that circulates grain in a storage chamber and a drying section while supplying drying hot air to the drying section to perform a drying process, comprising: a storage chamber storing grain containing layers with multiple moisture values; moisture detection means for detecting the moisture value of the grain in each layer; a drying section for drying the grain from the storage chamber with drying hot air; and a rotary valve for dispensing the grain from the drying section while rotating, wherein the rotary valve slows down the grain to keep it in the drying section and accelerates it back to the storage chamber via a conveying means, and the rotary valve The rotary valve comprises a control means for controlling the rotation of the lubricant, wherein the control means measures the moisture content of the grain in each layer during one circulation of the grain in the storage chamber and drying section using the moisture detection means, and in each layer during the circulation of the grain, based on the results of the moisture content measurement, if the number of grains having a moisture content below a first threshold moisture content is less than a second threshold, the rotary valve is decelerated, and if the number of grains having a moisture content below the first threshold moisture content is greater than or equal to the second threshold, the rotary valve is accelerated. 【0009】 In other words, in the first invention, the control means uses a moisture detection means to measure the moisture content of the grain in each layer during one circulation of the grain in the storage chamber and the drying section. Based on the moisture content measurement results, the control means slows down the rotary valve in each layer during the circulation of the grain if the number of grains with a moisture content below a first threshold is less than a second threshold, and speeds up the rotary valve if the number of grains with a moisture content below a first threshold is equal to or greater than the second threshold. As a result, in layers with few low-moisture grains, the time spent in the drying section is longer, thus increasing the drying time by hot air, while in layers with many low-moisture grains, the time spent in the drying section is shorter, thus decreasing the drying time by hot air. In other words, in a circulating drying system, in layers with a high moisture content, the outer hulls are dried, and tempering drying, which equalizes the moisture content of the grains through moisture transfer from the brown rice and other grains in the inner layers to the hulls, is sufficiently performed. In layers with a high moisture content, tempering drying is difficult to achieve, thus preventing uneven drying due to insufficient drying of high-moisture grains within the layers and cracking due to over-drying of low-moisture grains. 【0010】 In the second invention, in the first invention, the control means is configured to set the rotary valve to the slowest speed when the number of grains having a moisture value below the first threshold moisture value is zero. 【0011】 In other words, in the second invention, in the first invention, the control means sets the rotary valve to the slowest speed when the number of grains having a moisture value below the first threshold moisture value is zero. Therefore, in layers where there are no low-moisture grains, i.e., layers containing only high-moisture grains, the time spent in the drying section is maximized, and tempering drying is maximized. This prevents uneven drying due to insufficient tempering drying of high-moisture grains in the layer. 【0012】 In the third invention, the first invention further comprises a filling amount detection means for detecting the amount of grain filling in the storage chamber, wherein the control means determines the number of layers of grain based on the detected filling amount, and measures the moisture content of the grain in each layer by measuring the moisture content of the grain at predetermined time intervals determined based on the number of layers using the moisture detection means. 【0013】 In other words, in the third invention, as in the first invention, the control means determines the number of grain layers based on the amount of grain stored in the storage chamber detected by the amount of stock detection means, and measures the moisture content of the grain in each layer by measuring the moisture content of the grain at predetermined time intervals determined based on the number of layers using the moisture detection means, so that the unevenness of moisture content in the grain of each layer can be easily and readily grasped. 【0014】 In the fourth invention, the first invention further comprises a grain temperature sensor for detecting the grain temperature, and the control means is configured to lower the temperature of the drying hot air when the grain temperature detected by the grain temperature sensor is above a predetermined temperature. 【0015】 In other words, in the fourth invention, in the first invention, the control means lowers the temperature of the drying hot air when the grain temperature detected by the grain temperature sensor is above a predetermined temperature, thereby preventing the occurrence of cracking due to a rapid rise in grain temperature. 【0016】 In the fifth invention, in the first invention, the control means is configured to set the rotary valve to the fastest possible speed in the initial setting. 【0017】 In other words, in the fifth invention, in the first invention, the control means sets the rotary valve as quickly as possible in the initial setting, so that in the first measurement of the moisture content of the grains when the grains in the storage chamber and drying section are circulated once, even in layers with many low-moisture grains, the time the grains remain in the drying section is minimized and the drying time is minimized, thus preventing the occurrence of cracking due to over-drying. 【0018】 In the sixth invention, in the first to fifth inventions, the first threshold moisture value is 18% or more and 22% or less, and the second threshold value is 5% or more and 30% or less. 【0019】 That is, in the sixth invention, in the first to fifth inventions, since the first threshold moisture value is 18% or more and 22% or less, and the second threshold value is 5% or more and 30% or less, the control means can surely and efficiently determine the moisture value at which no barrel cracking occurs. Therefore, it is possible to surely and efficiently prevent the occurrence of uneven drying due to insufficient drying and the occurrence of barrel cracking due to over-drying. 【Effect of the Invention】 【0020】 According to the present invention, it is possible to provide a high-yield grain drying control device that can prevent the occurrence of barrel cracking due to over-drying or uneven drying due to insufficient drying. 【Brief Description of the Drawings】 【0021】 [Figure 1] FIG. 1 is a physical configuration diagram of a grain drying control device according to an embodiment of the present invention, showing (A) a front view and (B) a side cross-sectional view. [Figure 2] FIG. 2 is a functional configuration diagram of a grain drying control device according to an embodiment of the present invention. [Figure 3A] FIG. 3A is a flowchart of a grain drying control device according to an embodiment of the present invention. [Figure 3B] FIG. 3B is a flowchart of a grain drying control device according to an embodiment of the present invention. [Figure 4] FIG. 4 shows (A) the arrangement of a grain layer, (B) the one-round measurement results of the moisture values of each layer, and (C) an example of the moisture distribution of each layer by a grain drying control device according to an embodiment of the present invention. [Figure 5] FIG. 5 is a diagram for explaining the drying circulation operation by a grain drying control device according to an embodiment of the present invention. 【Mode for Carrying Out the Invention】 【0022】 Embodiments of the present invention will be described in detail below with reference to the drawings. Note that the following description of preferred embodiments is essentially illustrative. 【0023】 (Grain drying control device) As shown in Figures 1 and 2, the grain drying control device 1 (hereinafter sometimes simply referred to as the drying device 1) is formed in the order of upper conveyor 9, storage chamber 11, drying section 12, drive unit 13, and lower conveyor 7 from top to bottom. It is a known configuration in which the grain is circulated by the drive of an elevator 8 provided on its outer periphery, and drying is done by blowing hot drying air generated by the combustion of a burner 4 and a blower 18 onto the drying section 12 via a blower duct 15, a louver 19, and an exhaust duct 16. The blower duct 15 and the exhaust duct 16 are equipped with guide walls 17 that guide the drying hot air to the drying section 12. 【0024】 More specifically, the drying apparatus 1 is equipped with a rotary valve 2 that rotates in one direction and causes a predetermined amount of grain to flow down the grain outlet of the drying section 12, the discharged grain is received by a lower conveyor 7, and supplied to the scattering plate 11b of the storage chamber 11 by an upper conveyor 9 connected to the upper side via an elevator 8, so that the returned grain is uniformly accumulated and stored across the entire surface of the storage chamber 11. 【0025】 The drying apparatus 1 also includes a storage chamber 11 load sensor 11a, a grain temperature sensor 6 at the grain outlet of the drying section 12, a moisture sensor 3 between the lower conveyor 7 and the elevator 8, a hot air sensor 20 in the air duct 15, and a drying control unit 5 that controls the rotary valve 2, burner 4, and blower 18. 【0026】 (Loading amount sensor) The loading amount sensor 11a is used to measure the height of the top surface of the grain pile stored (loaded) in the storage chamber 11 and the drying section 12 and to calculate the loading amount. In Figure 1, it is installed on the top plate of the storage chamber 11, but it is not limited to the top plate; it may also be installed on the side to detect the height of the grain layer in the storage chamber 11 and the drying section 12. Alternatively, the loading amount may be calculated by measuring the weight of the grain with a weighing instrument. 【0027】 (Grain temperature sensor) The grain temperature sensor 6 is for measuring the grain temperature (grain temperature) inside the drying apparatus 1. It is installed at the grain outlet of the drying section 12 and may measure the grain temperature using a non-contact infrared sensor or the like. 【0028】 (Moisture sensor) The moisture sensor 3 is used to measure the single grain moisture content of each grain in each layer of the grain bed. The moisture sensor 3 is installed between the lower conveyor 7 and the elevator 8, and in a single measurement, it samples a predetermined number of grains, for example 100 grains, to measure the grain moisture content of each layer. 【0029】 (Hot air sensor) The hot air sensor 20 is for measuring the temperature of the drying hot air used to dry the grain. The hot air sensor 20 is installed inside the air blower 15 and may measure the drying hot air temperature using a contact thermocouple or the like. 【0030】 (Drying control unit) The drying control unit 5 is configured to cause the drying device 1 to perform a drying process to the target moisture content by circulating the grains packed in the storage chamber 11 and the drying section 12 and supplying drying hot air to the drying section 12 at a set drying speed. Specifically, the drying control unit 5 performs a round measurement in which, during one round of circulation of grains containing layers with multiple moisture content values, the moisture content of the grains in each layer is measured by the moisture sensor 3 at multiple different timings corresponding to the amount of grains packed as detected by the amount of grains packed as detected by the amount of grains packed as detected by the amount of grains packed as detected by the amount of grains packed as detected by the amount of grains packed as detected by the amount of grains packed as detected by the amount of grains packed as detected by the amount of grains packed as a moisture sensor 5 determines the degree of moisture unevenness, and causes the drying device 1 to perform a round drying operation at a drying speed that converges this moisture unevenness to the target moisture content by circulating the grains. 【0031】 In other words, the drying control unit 5 controls the drying apparatus 1 to perform a circulating drying operation until it reaches the target moisture content, based on the vertical moisture unevenness obtained by the measurement of the loaded grains in one pass. It also performs appropriate operation control according to the moisture unevenness until it reaches the target moisture content, and enables the convergence of moisture unevenness at the same time as the drying is completed. 【0032】 The drying control unit 5 can be implemented by a computer equipped with memory for storing control programs and various data necessary for the operation control of the drying apparatus 1. 【0033】 As shown in Figure 2, the drying control unit 5 receives information from various buttons 21-25 on the control panel (not shown) of the drying apparatus 1, such as loading, drying, discharge, stop, and emergency stop, as well as detection information from the moisture sensor 3 and grain temperature sensor 6, and drying hot air temperature detection information from the hot air sensor 20. Output information includes combustion system signals from the burner 4, such as the fuel supply signal and its flow rate control signal, as well as start and stop control signals for the lower conveyor 7, elevator 8 and upper conveyor 9, etc., rotary motor control signals for the rotary valve 2, motor control signals for the blower 18, and display output to the control panel. 【0034】 In addition to the settings mentioned above, the control panel also allows for settings such as grain type 26, target moisture content for drying 27 (finishing moisture content), and loading amount 28. 【0035】 (Drying control treatment) Next, the circulating drying control process of the drying control unit 5 will be explained in detail using Figures 3 to 5. 【0036】 Figures 3A to 3B show the control process flowcharts for the drying control unit 5. 【0037】 The drying control unit 5 starts the circulating drying operation for the grains loaded into the storage chamber 11 and the drying section 12 when the drying button 22 on the control panel is pressed at S21 in Figure 3A. That is, the drying control unit 5 determines the time T required to complete one circulation within the drying apparatus 1 (hereinafter sometimes referred to as "circulation time T") and the number of grain layers based on the amount of grains loaded detected by the loading amount sensor 11a, and starts the circulating drying process. In the following explanation, it is assumed that there are a total of 10 grain layers, from the bottom layer LY1 to the top layer LY10, determined based on the amount of grains loaded. 【0038】 After the circulating drying process begins, the drying control unit 5 measures the moisture content of the grains in each layer using the moisture sensor 3 at regular intervals, for example, every T / 10, during the first cycle, in S22-S24. After the first cycle of circulating drying (hereinafter sometimes referred to as "one-cycle measurement") for the grains in each layer is completed, in S25, the average moisture content and moisture distribution of the grains in each layer are calculated. The drying control unit 5 is initially configured to operate normally with a predetermined drying section passage time, for example, 1 hour, determined by the specifications, structure, and control panel settings of the drying apparatus 1, as well as a drying hot air temperature determined by the load amount, target moisture content, etc. Furthermore, if there is a particularly high risk of over-drying of the grains, the drying control unit 5 can also initially set the speed of the rotary valve 2 during the one-cycle measurement to the fastest possible speed, which minimizes the time the grains remain in the drying section 12. 【0039】 Figure 4 shows the results of a series of moisture measurements and examples of moisture distribution for each layer of grain layers LY1 to LY10. Figure 4(A) shows the vertical arrangement of grain layers LY1 to LY10 in the drying apparatus 1, Figure 4(B) shows the vertical distribution of the average moisture value (e.g., the average value of 100 grains) for each layer of grain layers LY1 to LY10, and Figure 4(C) shows examples of moisture distribution of grains (e.g., 100 grains) in each layer of grain layers LY1, LY2, and LY10, such as moisture distribution histograms 31, 32, and 33 plotting the number of grains against the moisture value. 【0040】 (LY layer processing started) Next, as shown in Figure 5, when the drying control unit 5 circulates and transports the grain layer LY1 to start the second cycle of circulating drying, it performs the circulating drying process on the grain layer LY1 according to the following first to third operating modes based on the moisture distribution histogram 31. At this time, the time T1 from the end of the first cycle measurement to the start of the second cycle of circulating drying for the grain layer LY1 can be determined based on the circulation time T. For example, T1 = T may be set. Similarly, the drying process for the third and subsequent cycles can also be started after T1 of the previous circulating drying process. 【0041】 (First operating mode) In S28 of Figure 3B, it is determined whether or not grains exist in the moisture distribution histogram 31 of the grain layer LY1 in the region of grains having a first threshold moisture value, for example, a moisture value of 18% or less (hereinafter also referred to as the "critical moisture region"). If no grains are present in the "critical moisture region" of the moisture distribution histogram 31, that is, if the number of grains is 0, in S30 the rotary valve 2 is decelerated, for example, to 2 / 3 the normal operating speed. Alternatively, the rotary valve 2 may be set to the slowest speed to ensure sufficient tempering and drying. 【0042】 (Second operating mode) In S28, if grains are present in the "critical moisture range" of the moisture distribution histogram 31, in S29, it is determined whether the number of grains included in the "critical moisture range" (hereinafter also referred to as the "critical moisture level") exceeds the second threshold, for example, 10% or more of the number of grains to be sampled. If the "critical moisture level" of grain layer LY1 does not exceed 10%, that is, if it is less than 10%, in S31, the rotary valve 2 is decelerated, for example, to 2 / 3 the normal operating speed. 【0043】 (Third operating mode) In S29, if the "dangerous moisture level" of the grain layer LY1 is 10% or higher, in S32, the rotary valve 2 is increased in speed, for example, to 1.5 times the normal operating speed. 【0044】 In the second and third operating modes, in S33, it is determined whether the grain temperature is above a predetermined temperature, for example, 36°C. If the grain temperature is above 36°C, in S34, the burner 4 is controlled to lower the drying hot air temperature by a predetermined amount, for example, 2°C. 【0045】 Furthermore, according to experimental results (Takeshi Fukumori, et al., "Study on High-Speed ​​Grain Drying (Part 1)", Journal of the Japanese Society of Agricultural Production Technology Management 7(2):39-43, 2000), the first threshold moisture content is preferably 18-22%, and particularly preferably 18%, in order to prevent quality deterioration such as cracking and a decrease in taste. The second threshold moisture content is empirically preferably 5-30%, and particularly preferably 10%. 【0046】 (LY layer processing complete) In S35, the drying control unit 5 determines whether the circulating drying process of the grain layer LY1 has been completed. For example, the drying control unit 5 determines whether time T / 10 has elapsed since the start of the second circulating drying process of the grain layer LY1. The circulating drying process of the grain layer LY1 continues until time T / 10 has elapsed. 【0047】 When time T / 10 has elapsed since the start of the second cycle of circulating drying treatment for grain layer LY1, the circulating drying treatment for grain layer LY1 is terminated. 【0048】 (Drying complete) In S36, the drying control unit 5 determines whether the conditions for terminating circulating drying are met. Specifically, for each grain layer LY1 to LY10, the drying control unit 5 determines whether the drying target moisture content, for example, an average moisture content of 15% or less, has been reached, and in S38, the circulating drying operation of the drying apparatus 1 is terminated. If the drying target moisture content is not achieved, the drying control unit 5 sets the circulating drying process for grain layer LY2 in S37 and returns to S27. 【0049】 The drying control unit 5 then repeats the circulating drying process S27 to S37 for the grain layers LY1 to LY10 until the drying completion condition is met in S36. 【0050】 Furthermore, the drying control unit 5 can terminate the circulating drying operation of the drying apparatus 1 at any time by pressing the stop button 24 or the emergency stop button 25 on the control panel. 【0051】 (Operation of grain drying control device 1) The operation of the grain drying control device 1 according to an embodiment of the present invention will be described below. 【0052】 After setting the type of grain to be dried 26 and the loading amount 28 on the control panel of the grain drying control device 1, pressing the loading button 21 causes the set loading amount of grain to be deposited in the storage chamber 11 and the drying section 12. Next, after setting the drying target moisture content 27 on the control panel to, for example, a finish moisture content of 15% or less on average, pressing the drying button 22 determines the number of grain layers corresponding to the loading amount, for example, LY1 to LY10, and the first cycle of circulating drying treatment, i.e., a complete measurement of grain moisture content, is performed for each layer. Then, in the circulating drying treatment from the second cycle onward, in grain layers LY1 to LY10, if the number of grains belonging to the "dangerous moisture content range" of the moisture content distribution histogram (31, 32, 33, etc.) exceeds 10% of the number of grains sampled, i.e., in layers with many low-moisture grains, the rotary valve 2 is accelerated, shortening the time spent in the drying section 12 and preventing over-drying (third operating mode). 【0053】 Furthermore, if the number of grains belonging to the "critical moisture range" in the moisture distribution histogram is small (less than 10% of the total number of grains sampled), or if there are no grains belonging to the "critical moisture range," the rotary valve 2 is decelerated, increasing the time spent in the drying section 12. In other words, in layers with a high concentration of high-moisture grains, sufficient tempering drying is performed, which dries the outer hulls and equalizes the moisture content of the grains through moisture transfer from the inner brown rice to the hulls. This prevents uneven drying due to insufficient tempering drying of high-moisture grains within the layer (second and first operating modes). 【0054】 Furthermore, if there are grains in the moisture distribution histogram that belong to the "dangerous moisture range," and the grain temperature at the grain outlet of the drying unit 12 detected by the grain temperature sensor 6 is 36°C or higher, the temperature of the drying hot air is lowered, thereby preventing the occurrence of grain cracking due to a rapid rise in grain temperature (second and third operating modes). 【0055】 Drying apparatus 1 continues the circulating drying process for each grain layer LY1 to LY10 until the set target moisture content is reached, and automatically terminates the circulating drying operation once the target moisture content is reached. 【0056】 After the circulating drying operation is completed, the dried grain can be discharged from the drying device 1 by pressing the discharge button 23 on the control panel of the grain drying control device 1. 【0057】 (summary) According to the grain drying control device 1 according to an embodiment of the present invention, the drying control unit 5 (control means) uses a moisture sensor 3 (moisture detection means) to measure the moisture content of the grains in each layer LY during one circulation of the grains in the storage chamber 11 and the drying section 12. Based on the moisture content measurement results 31, 32, 33, etc., in each layer LY during the circulation of the grains, the rotary valve 2 is decelerated if the number of grains with a moisture content of 18% (first threshold moisture content) or less is less than 10% (second threshold), and the rotary valve 2 is accelerated if the number of grains with a moisture content of 18% or less is 10% or more. As a result, in layers with few low-moisture grains, the time spent in the drying section 12 is longer, so the drying time by hot air is longer, and in layers with many low-moisture grains, the time spent in the drying section 12 is shorter, so the drying time by hot air is reduced. In other words, in a circulating drying system, in layers with a high moisture content, the outer hulls are dried, and tempering drying, which equalizes the moisture content of the grains through moisture transfer from the brown rice and other grains in the inner layers to the hulls, is sufficiently performed. In layers with a high moisture content, tempering drying is difficult to achieve, thus preventing uneven drying due to insufficient drying of high-moisture grains within the layers and cracking due to over-drying of low-moisture grains. 【0058】 Furthermore, according to the grain drying control device 1, when the number of grains with a moisture content of 18% or less is 0, the drying control unit 5 sets the rotary valve 2 to the slowest speed. As a result, the time spent in the drying unit 12 is maximized in layers where there are no low-moisture grains, i.e., layers containing only high-moisture grains, and tempering drying is maximized. This prevents uneven drying due to insufficient tempering drying of high-moisture grains in the layers. 【0059】 Furthermore, according to the grain drying control device 1, the drying control unit 5 determines the number of grain layers based on the amount of grain packed into the storage chamber 11 and the drying unit 12 detected by the amount of packed sensor 11a (amount of packed sensor), and measures the moisture content of the grain in each layer LY by measuring the moisture content of the grain at predetermined time intervals determined based on the number of layers using the moisture sensor 3. This makes it easy and simple to grasp the unevenness of moisture content in the grain of each layer LY. 【0060】 Furthermore, according to the grain drying control device 1, the drying control unit 5 lowers the temperature of the drying hot air when the grain temperature detected by the grain temperature sensor 6 is 36°C or higher, thereby preventing the occurrence of cracking due to a rapid rise in grain temperature. 【0061】 Furthermore, according to the grain drying control device 1, the drying control unit 5 sets the rotary valve 2 to the fastest possible speed in the initial setting. Therefore, in the first measurement of the moisture content of the grains when the grains in the storage chamber 11 and drying unit 12 are circulated once, even in layers with many low-moisture grains, the time the grains remain in the drying unit 12 is minimized, and the drying time is minimized, thus preventing the occurrence of cracking due to over-drying. 【0062】 Furthermore, according to the grain drying control device 1, the first threshold moisture value is 18%, which is between 18% and 22%, and the second threshold is 10%, which is between 5% and 30%. Therefore, the drying control unit 5 can reliably and efficiently determine the moisture value at which cracking does not occur, thereby reliably and efficiently preventing uneven drying due to insufficient drying and cracking due to over-drying. 【0063】 According to the present invention, it is possible to provide a grain drying control device that can prevent cracking due to over-drying or uneven drying due to insufficient drying, thereby achieving a high yield. 【0064】 (modified version) In the grain drying control device 1, the first threshold moisture content is set to 18% and the second threshold to 10%, but this is not limited to these values, and they may be appropriately changed depending on the type of grain, target drying moisture content, loading amount, or intended use. As mentioned above, in order to prevent quality deterioration such as cracking of the grain and a decrease in taste, the first threshold moisture content can be set to 18-22% and the second threshold to 5-30%. 【0065】 In the grain drying control device 1, the number of grains sampled to measure the single-grain moisture content of each grain layer is 100, but this is not limited to this number; it may be less or more than 100. By increasing the number of grains sampled to more than 100, the accuracy of measuring the moisture distribution of each grain layer can be improved, enabling highly accurate grain drying control operation. Conversely, by decreasing the number of grains sampled to less than 100, the moisture distribution of each grain layer can be measured at high speed, enabling high-speed grain drying control operation. 【0066】 In the grain drying control device 1, the circulation time T1 for the second and subsequent cycles is determined based on the initial load amount (for example, T1=T), but is not limited to this, and the following circulation time T2 calculated based on grain moisture content and apparent density may be used. After one cycle, the circulation time T2 when the grain moisture content M1(%) becomes M2(%) can be calculated from the original circulation time T using formula 1. [Mathematics 1] T2 = T × ((100 - M1) / (100 - M2)) × α Here, α is the rate of increase in apparent density, and is a value determined by the type of grain and moisture content. Furthermore, the reduction and extension of circulation time due to the acceleration and deceleration control of the rotary valve 2 in each layer may also be taken into consideration for the above T2. 【0067】 In the grain drying control device 1, the rotation speed of the rotary valve 2 is 1.5 times the normal operating speed when increasing speed and 2 / 3 times the normal operating speed when decreasing speed, but is not limited to this and may be changed as appropriate depending on the type of grain, target moisture content for drying, loading amount, or intended use. 【0068】 In the grain drying control device 1, the grain temperature sensor 6 is installed at the grain outlet of the drying unit 12, but is not limited to this location; multiple sensors may be installed in the height direction of the drying unit 12. By installing multiple grain temperature sensors 6, the grain temperature inside the drying unit 12 can be measured with high accuracy, thereby enabling highly accurate grain drying control operation. 【0069】 In the grain drying control device 1, the guide walls 17 of the air blower 15 and exhaust 16 are fixed in position, but are not limited to this, and may be movable vertically according to the number of grain layers determined based on the amount of grain loaded. For example, by making the guide walls 17 movable vertically, the drying control unit 5 can ensure that only the layers with the moisture distribution based on the circulating drying process of each operating mode are included in the drying section 12, so that the process does not affect other layers, thereby enabling precise grain drying control. In addition, a cover that opens and closes may be provided on the side of the air blower 15 at the inlet of the louver 19. 【0070】 In the grain drying control device 1, the drying control unit 5 monitored and controlled the device to lower the drying hot air temperature when the grain temperature was 36°C or higher. However, it is not limited to this, and the grain temperature value to be monitored may be changed as appropriate depending on the type of grain, target moisture content for drying, loading amount, or intended use. 【0071】 In the drying apparatus 1, the rotary valve 2 is designed to rotate in one direction, but it is not limited to this and may rotate in the opposite direction. For example, by rotating in both forward and reverse directions, the grains on the left and right sides of the grain outlet of the drying section 12 can be allowed to flow down without bias. 【0072】 The present invention is not limited to the embodiments described above, but includes various modifications to the embodiments described above, without departing from the spirit of the invention. [Explanation of Symbols] 【0073】 Grain drying control device 1 Rotary valve 2 Moisture sensor 3 Burner 4 Drying control unit 5 Grain temperature sensor 6 Storage room 11 Tension level sensor 11a Drying section 12 Blower 18 Luba 19 Hot air sensor 20 Grain layer LY, LY1, LY2,..., LY10

Claims

[Claim 1] In a grain drying control device that circulates grain in a storage chamber while supplying drying hot air to a drying section for drying, A storage chamber containing grains with multiple moisture content levels, A moisture detection means for detecting the moisture content of the grains in each layer, A drying section for drying the grain from the storage chamber with hot air, A rotary valve that discharges the grain from the drying section while rotating, the rotary valve that causes the grain to remain in the drying section by deceleration and then sends it back to the storage chamber via a conveying means by increasing speed, The rotary valve comprises a control means for controlling the rotation of the rotary valve, The control means measures the moisture content of the grain in each layer during one circulation of the grain in the storage chamber and the drying section using the moisture detection means, and in each layer during the circulation of the grain, based on the results of the moisture content measurement, If the number of grains having a moisture content below the first threshold moisture content is less than the second threshold, the rotary valve is decelerated, and A grain drying control device configured to increase the speed of the rotary valve when the number of grains having a moisture content below the first threshold moisture content is equal to or greater than the second threshold. [Claim 2] The grain drying control device according to claim 1, wherein the control means is configured to set the rotary valve to the slowest speed when the number of grains having a moisture content below the first threshold moisture content is zero. [Claim 3] The storage chamber further comprises a filling amount detection means for detecting the amount of grains filled in the storage chamber, The grain drying control device according to claim 1, wherein the control means determines the number of grain layers based on the detected amount of loading, and measures the moisture content of the grain in each layer by measuring the moisture content of the grain at predetermined intervals determined based on the number of layers using the moisture detection means. [Claim 4] The system further includes a grain temperature sensor for detecting the grain temperature, The grain drying control device according to claim 1, wherein the control means is configured to lower the temperature of the drying hot air when the grain temperature detected by the grain temperature sensor is above a predetermined temperature. [Claim 5] The grain drying control device according to claim 1, wherein the control means is configured to set the rotary valve to the fastest possible speed in the initial setting. [Claim 6] The grain drying control device according to any one of claims 1 to 5, wherein the first threshold moisture content is 18% or more and 22% or less, and the second threshold is 5% or more and 30% or less.

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