Continuous grain dryer over-drying prevention device and method

Abstract

The application provides a continuous grain dryer over-drying prevention device and method. The continuous grain dryer over-drying prevention device comprises a dryer body, a controller, and a plurality of temperature sensors. The dryer body is provided with an air outlet side. The plurality of temperature sensors are installed on the air outlet side of the dryer body. The dryer body is provided with a grain discharge gate. The controller is connected with the plurality of temperature sensors and the grain discharge gate. The plurality of temperature sensors are arranged on the air outlet side of the continuous grain dryer. The monitoring values of the temperature sensors are transmitted to the controller. Through a series of algorithms, the over-drying of the grain is protected. Only by arranging the plurality of temperature sensors, the drying quality of the grain can be monitored, and the structure is simple and easy to realize. The operation frequency of the user is reduced, the experience of the user is improved, and the operation fatigue is relieved. By changing the grain discharge interval time, the user can control the moisture of the grain at the outlet, prevent the over-drying and under-drying of the grain, and ensure the income of the user.

Description

Technical Field

[0001] This invention relates to the field of grain drying equipment technology, and in particular to a device and method for preventing over-drying in a continuous grain dryer. Background Technology

[0002] my country is the world's largest producer and consumer of grain, with an annual total output of 6.9541 trillion tons. Grain drying is a crucial link in the mechanization of the entire grain production process, and after harvesting, farmers' grain storage is the most critical step. In recent years, extreme weather events have become frequent, especially in some areas where continuous flooding has led to an increase in moldy grain due to weather conditions. Grain drying has become a vital need for farmers, providing an opportunity for the development of the continuous grain dryer market. Since the moisture content of different batches of grain varies, maintaining consistent moisture content after drying is an urgent requirement; simultaneously, reducing the frequency of user operations and improving the user experience are also pressing needs.

[0003] Because the moisture content of grain entering a continuous dryer varies from batch to batch, maintaining consistent moisture content after drying requires users to constantly adjust the opening interval of the discharge mechanism based on the grain's moisture content. Firstly, this frequent adjustment of the discharge interval results in a poor user experience. Secondly, if the user is not present, it can lead to uneven drying and potentially result in over-drying or under-drying of the grain. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for preventing over-drying in a continuous grain dryer, which addresses the shortcomings of the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a continuous grain dryer anti-over-drying device, comprising: a dryer body, a controller, and multiple temperature sensors, wherein the dryer body is provided with an exhaust side, the multiple temperature sensors are installed on the exhaust side of the dryer body, the dryer body is provided with a grain discharge gate, and the controller is connected to the multiple temperature sensors and the grain discharge gate respectively.

[0006] The beneficial effects of adopting the technical solution of this invention are as follows: Multiple temperature sensors are arranged on the exhaust side of the continuous grain dryer. The monitored values ​​of the temperature sensors are transmitted to the controller, and through a series of algorithms, a protection against over-drying of the grain is achieved. By simply arranging multiple temperature sensors, the grain drying quality can be monitored, and the structure is simple and easy to implement. Combining accumulated user experience and converting it into a PLC electronic control program, the grain moisture content at the outlet is well-consistent. This reduces the frequency of user operations, improves the user experience, and alleviates operational fatigue. By changing the grain discharge interval, users can control the moisture content of the grain at the outlet, preventing over-drying and under-drying, thus ensuring user profits.

[0007] Furthermore, the present invention also provides a method for preventing over-drying in a continuous grain dryer. Based on the aforementioned device for preventing over-drying in a continuous grain dryer, the method for preventing over-drying in a continuous grain dryer includes: S1, obtaining a preset discharge interval time, a preset outlet temperature limit, and multiple actual outlet temperatures; S2, analyzing the relationship between the multiple actual outlet temperatures and the preset outlet temperature limit, and calculating the actual discharge interval time based on the relationship between the multiple actual outlet temperatures and the preset outlet temperature limit, and the preset discharge interval time; S3, controlling the discharge gate to discharge grain according to the actual discharge interval time.

[0008] The beneficial effects of adopting the technical solution of this invention are as follows: Multiple temperature sensors are arranged on the exhaust side of the continuous grain dryer. The monitored values ​​of the temperature sensors are transmitted to the controller, and through a series of algorithms, a protection against over-drying of the grain is achieved. By simply arranging multiple temperature sensors, the grain drying quality can be monitored, and the structure is simple and easy to implement. Combining accumulated user experience and converting it into a PLC electronic control program, the grain moisture content at the outlet is well-consistent. This reduces the frequency of user operations, improves the user experience, and alleviates operational fatigue. By changing the grain discharge interval, users can control the moisture content of the grain at the outlet, preventing over-drying and under-drying, thus ensuring user profits.

[0009] Further, step S1 includes: S11, obtaining the preset discharge interval time, the preset air outlet temperature limit, and multiple actual air outlet temperatures; S12, setting the red alarm limit, the yellow alarm limit, and the low temperature alarm limit according to the preset air outlet temperature limit.

[0010] The beneficial effects of adopting the above-mentioned further technical solution are: by analyzing and comparing multiple actual outlet temperatures with red alarm limits, yellow alarm limits, and low temperature alarm limits in sequence, it is easier to accurately calculate and control the grain discharge interval time, thereby improving stability, accuracy, and reliability.

[0011] Further, in step S12, the red alarm limit is equal to the preset outlet temperature limit plus 5 degrees Celsius, the yellow alarm limit is equal to the preset outlet temperature limit, and the low temperature alarm limit is equal to the preset outlet temperature limit minus 10 degrees Celsius.

[0012] The beneficial effects of adopting the above-mentioned further technical solution are: by sequentially analyzing and comparing multiple actual outlet temperatures with red alarm limits, yellow alarm limits, and low-temperature alarm limits, it is easier to accurately calculate and control the grain discharge interval, improving stability, accuracy, and reliability. By changing the grain discharge interval, users can control the moisture content of the grain at the outlet, preventing over-drying or under-drying of the grain and ensuring user profits.

[0013] Further, step S2 includes: S21, determining whether there is an actual outlet temperature among the multiple actual outlet temperatures that is greater than the red alarm limit; S22, when there is an actual outlet temperature among the multiple actual outlet temperatures that is greater than the red alarm limit, reducing the preset temperature of the burner, and calculating the second actual discharge interval time according to the preset discharge interval time.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that: if any of the multiple exhaust temperature values ​​(actual outlet temperature) is greater than the optimal outlet temperature (preset outlet temperature limit) red alarm value, the two maximum values ​​among the multiple temperature values ​​are taken, and then the average value is taken. The average value is compared with the optimal outlet temperature limit, and the difference between the two is calculated as ΔT. At this time, it is urgent to significantly reduce the grain discharge interval time. Through the formula of Algorithm 2: Y2=Y-30, the grain is discharged quickly.

[0015] Further, step S22 includes: S221, when one of the multiple actual outlet temperatures is greater than the red alarm limit, reducing the preset temperature of the burner, calculating the second actual discharge interval time, obtaining the preset duration, and recording the actual duration for which the actual outlet temperature is greater than the red alarm limit; S222, determining whether the actual duration is greater than the preset duration; S223, when the actual duration is greater than the preset duration, turning off the burner and reducing the outlet temperature.

[0016] The beneficial effects of adopting the above-mentioned further technical solution are as follows: If any of the exhaust air temperatures (actual outlet temperatures) exceeds the optimal outlet temperature (preset outlet temperature limit) triggers a red alarm, the PLC controller automatically lowers the burner's set temperature. Based on previous test data, lowering the burner temperature to 60℃ ensures the avoidance of fire in the drying tower. If the outlet temperature still exceeds the red alarm value (red alarm limit), the burner is shut off to quickly reduce the outlet temperature, preventing over-drying of the grain and ensuring the quality of the dried grain and the interests of farmers.

[0017] Further, after step S21, the following steps are included: S23, when multiple actual outlet temperatures are all lower than the red alarm limit, determine whether any of the multiple actual outlet temperatures is higher than the yellow alarm limit; S24, when any of the multiple actual outlet temperatures is higher than the yellow alarm limit, select the two maximum values ​​among the multiple actual outlet temperatures and calculate the average of the two maximum values; S25, determine whether the average value is greater than a preset outlet temperature limit; S26, when the average value is greater than the preset outlet temperature limit, calculate the difference between the average value and the preset outlet temperature limit; S27, calculate the first actual discharge interval time based on the difference between the average value and the preset outlet temperature limit and the preset discharge interval time.

[0018] The beneficial effects of adopting the above-mentioned further technical solution are as follows: If any of the multiple exhaust temperature values ​​(actual outlet temperature) is greater than the yellow alarm limit but less than the red alarm limit, the PLC controller will not adjust the burner's set temperature value; at the same time, the two maximum values ​​among the multiple temperature values ​​are taken, and then the average value is taken. The average value is compared with the optimal outlet temperature limit (preset outlet temperature limit). If it is greater than the optimal outlet temperature value, the difference ΔT between the two is calculated. Then, the grain discharge interval time is reduced based on the set grain discharge interval time. According to Algorithm 1: Y1=Y+1.65*ΔT-3.69*ΔT^2+2.13*ΔT^3-0.58*ΔT^4+0.05*ΔT^5, the actual grain discharge time Y1 is calculated, thereby quickly discharging grain, reducing the outlet temperature, preventing over-drying of grain, and ensuring the quality of grain drying and the interests of farmers.

[0019] Further, after step S23, the following steps are included: S231, when multiple actual outlet temperatures are all lower than the yellow alarm limit, determine whether any of the multiple actual outlet temperatures is higher than the low temperature alarm limit; S232, when any of the multiple actual outlet temperatures is higher than the low temperature alarm limit, select the two maximum values ​​among the multiple actual outlet temperatures and calculate the average of the two maximum values; S233, determine whether the average value is lower than a preset outlet temperature limit; S234, when the average value is lower than the preset outlet temperature limit, calculate the difference between the average value and the preset outlet temperature limit; S235, calculate a third actual discharge interval time based on the difference between the average value and the preset outlet temperature limit and a preset discharge interval time.

[0020] The beneficial effects of adopting the above-mentioned further technical solution are as follows: multiple exhaust temperature values ​​(actual outlet temperature) are all less than the optimal outlet temperature setting value (preset outlet temperature limit) and greater than the low temperature alarm limit, so the PLC controller will not adjust the burner's set temperature value; at the same time, the two maximum values ​​among the multiple temperature values ​​are taken, and then the average value is taken. The average value is compared with the optimal outlet temperature limit. If it is less than the optimal outlet temperature value, the difference ΔT between the two is calculated. Based on the magnitude of the difference, the grain discharge interval time is increased on the basis of the set grain discharge interval time, thereby slowing down the grain discharge. According to Algorithm 3: Y3=Y+1.08*exp^(-ΔT / 2.97), the actual grain discharge time Y3 is calculated, which increases the outlet temperature, prevents the grain from not being dried, and ensures the quality of grain drying and the interests of farmers.

[0021] Further, after step S231, the following steps are included: S2311, when the temperatures of multiple actual air outlets are all less than the low temperature alarm limit, the fourth actual grain discharge interval time is calculated based on the preset grain discharge interval time.

[0022] The beneficial effects of adopting the above-mentioned further technical solution are: multiple exhaust temperature values ​​(actual outlet temperature) are all less than the low temperature alarm limit, and the PLC controller will not adjust the burner's set temperature value; at the same time, based on the set grain discharge interval time (preset grain discharge interval time), the grain discharge interval time needs to be increased significantly. Through algorithm 4: Y4 = Y + 30, the grain discharge is slowed down, the outlet temperature is increased, the grain is prevented from being uncooked, and the quality of grain drying and the interests of farmers are guaranteed.

[0023] Further, the first actual discharge interval time is calculated using the following formula: Y1=Y+1.65*ΔT-3.69*ΔT^2+2.13*ΔT^3-0.58*ΔT^4+0.05*ΔT^5, where Y1 is the first actual discharge interval time, Y is the preset discharge interval time, and ΔT is the difference between the average of the two maximum values ​​among multiple actual outlet temperatures and the preset outlet temperature limit; the second actual discharge interval time is calculated using the following formula: Y2=Y-30, where Y2 is the second actual discharge interval time. The grain discharge interval time, Y, is the preset grain discharge interval time; the third actual grain discharge interval time is calculated using the following formula: Y3=Y+1.08*exp^(-ΔT / 2.97), where Y3 is the third actual grain discharge interval time, Y is the preset grain discharge interval time, and ΔT is the difference between the average of the two maximum values ​​among multiple actual outlet temperatures and the preset outlet temperature limit; the fourth actual grain discharge interval time is calculated using the following formula: Y4=Y+30, where Y4 is the fourth actual grain discharge interval time, and Y is the preset grain discharge interval time.

[0024] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By designing multiple algorithms corresponding to various scenarios, the actual grain discharge interval time can be accurately calculated. The actual outlet temperatures of multiple outlets are then analyzed and compared with red alarm limits, yellow alarm limits, and low-temperature alarm limits, facilitating accurate calculation and control of the grain discharge interval time, and improving stability, accuracy, and reliability. By changing the grain discharge interval time, users can control the moisture content of the grain at the outlet, preventing over-drying or under-drying, thus ensuring user profits.

[0025] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the anti-over-drying device for a continuous grain dryer provided in an embodiment of the present invention.

[0027] Figure 2 This is one of the schematic flowcharts of a continuous grain dryer method for preventing over-drying provided in an embodiment of the present invention.

[0028] Figure 3 This is the second schematic flowchart of a method for preventing over-drying in a continuous grain dryer provided in an embodiment of the present invention.

[0029] The following are the symbols in the attached diagram: 1. Dryer body; 2. Temperature sensor; 3. Grain discharge gate. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The embodiments described are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] like Figure 1 As shown, this embodiment of the invention provides a device for preventing over-drying in a continuous grain dryer, comprising: a dryer body 1, a controller, and multiple temperature sensors 2. The dryer body 1 is provided with an exhaust side, and the multiple temperature sensors 2 are installed on the exhaust side of the dryer body 1. The dryer body 1 is provided with a grain discharge gate 3, and the controller is connected to the multiple temperature sensors 2 and the grain discharge gate 3 respectively.

[0032] The beneficial effects of adopting the technical solution of this invention are as follows: Multiple temperature sensors are arranged on the exhaust side of the continuous grain dryer. The monitored values ​​of the temperature sensors are transmitted to the controller, and through a series of algorithms, a protection against over-drying of the grain is achieved. By simply arranging multiple temperature sensors, the grain drying quality can be monitored, and the structure is simple and easy to implement. Combining accumulated user experience and converting it into a PLC electronic control program, the grain moisture content at the outlet is well-consistent. This reduces the frequency of user operations, improves the user experience, and alleviates operational fatigue. By changing the grain discharge interval, users can control the moisture content of the grain at the outlet, preventing over-drying and under-drying, thus ensuring user profits.

[0033] The temperature sensors used are PT100 temperature sensors. Four PT100 temperature sensors are arranged on the exhaust side of the continuous grain dryer. The monitoring values ​​of the PT100 temperature sensors are transmitted to the controller, and through a series of algorithms, a protection mechanism is implemented to prevent over-drying of the grain.

[0034] like Figure 2 As shown, in addition, the present invention also provides a method for preventing over-drying in a continuous grain dryer. Based on the aforementioned device for preventing over-drying in a continuous grain dryer, the method for preventing over-drying in a continuous grain dryer includes: S1, obtaining a preset discharge interval time, a preset outlet temperature limit, and multiple actual outlet temperatures; S2, analyzing the relationship between the multiple actual outlet temperatures and the preset outlet temperature limit, and calculating the actual discharge interval time based on the relationship between the multiple actual outlet temperatures and the preset outlet temperature limit, and the preset discharge interval time; S3, controlling the discharge gate to discharge grain according to the actual discharge interval time.

[0035] The beneficial effects of adopting the technical solution of this invention are as follows: Multiple temperature sensors are arranged on the exhaust side of the continuous grain dryer. The monitored values ​​of the temperature sensors are transmitted to the controller, and through a series of algorithms, a protection against over-drying of the grain is achieved. By simply arranging multiple temperature sensors, the grain drying quality can be monitored, and the structure is simple and easy to implement. Combining accumulated user experience and converting it into a PLC electronic control program, the grain moisture content at the outlet is well-consistent. This reduces the frequency of user operations, improves the user experience, and alleviates operational fatigue. By changing the grain discharge interval, users can control the moisture content of the grain at the outlet, preventing over-drying and under-drying, thus ensuring user profits.

[0036] like Figure 3As shown, 1. Collect the temperatures of exhaust temperature sensor 1, exhaust temperature sensor 2, exhaust temperature sensor 3, and exhaust temperature sensor 4; 2. Take the two highest temperatures among the four and calculate the average value; 3. Determine if the average value is greater than the red alarm setting value (red alarm limit); 4. If so, determine if the duration is greater than 30 minutes; 5. If so, turn off the burner; 6. Start the exhaust fan and the circulating fan; 7. Open the exhaust louvers and the waste gas circulation louvers; 8. Control the grain discharge gate to stop.

[0037] Step 4 is followed by: 9. If not, reduce the burner set temperature; 10. Calculate the grain discharge interval time using a certain algorithm 2 and control the grain discharge gate.

[0038] Step 3 includes: 11. Determining whether the average value is greater than the yellow alarm setting value (yellow alarm limit); 12. If so, calculating the grain discharge interval time using a certain algorithm 1 and controlling the grain discharge gate.

[0039] Step 11 is followed by: 13. If not, determine whether the average value is less than the low temperature alarm limit; 14. If yes, control the grain discharge gate through a certain algorithm 4.

[0040] Step 13 is followed by: 15. If not, control the grain discharge gate through some algorithm 3.

[0041] Further, step S1 includes: S11, obtaining the preset discharge interval time, the preset air outlet temperature limit, and multiple actual air outlet temperatures; S12, setting the red alarm limit, the yellow alarm limit, and the low temperature alarm limit according to the preset air outlet temperature limit.

[0042] The beneficial effects of adopting the above-mentioned further technical solution are: by analyzing and comparing multiple actual outlet temperatures with red alarm limits, yellow alarm limits, and low temperature alarm limits in sequence, it is easier to accurately calculate and control the grain discharge interval time, thereby improving stability, accuracy, and reliability.

[0043] Further, in step S12, the red alarm limit is equal to the preset outlet temperature limit plus 5 degrees Celsius, the yellow alarm limit is equal to the preset outlet temperature limit, and the low temperature alarm limit is equal to the preset outlet temperature limit minus 10 degrees Celsius.

[0044] The beneficial effects of adopting the above-mentioned further technical solution are: by sequentially analyzing and comparing multiple actual outlet temperatures with red alarm limits, yellow alarm limits, and low-temperature alarm limits, it is easier to accurately calculate and control the grain discharge interval, improving stability, accuracy, and reliability. By changing the grain discharge interval, users can control the moisture content of the grain at the outlet, preventing over-drying or under-drying of the grain and ensuring user profits.

[0045] Further, step S2 includes: S21, determining whether there is an actual outlet temperature among the multiple actual outlet temperatures that is greater than the red alarm limit; S22, when there is an actual outlet temperature among the multiple actual outlet temperatures that is greater than the red alarm limit, reducing the preset temperature of the burner, and calculating the second actual discharge interval time according to the preset discharge interval time.

[0046] The beneficial effect of adopting the above-mentioned further technical solution is that: if any of the multiple exhaust temperature values ​​(actual outlet temperature) is greater than the optimal outlet temperature (preset outlet temperature limit) red alarm value, the two maximum values ​​among the multiple temperature values ​​are taken, and then the average value is taken. The average value is compared with the optimal outlet temperature limit, and the difference between the two is calculated as ΔT. At this time, it is urgent to significantly reduce the grain discharge interval time. Through the formula of Algorithm 2: Y2=Y-30, the grain is discharged quickly.

[0047] Further, step S22 includes: S221, when one of the multiple actual outlet temperatures is greater than the red alarm limit, reducing the preset temperature of the burner, calculating the second actual discharge interval time, obtaining the preset duration, and recording the actual duration for which the actual outlet temperature is greater than the red alarm limit; S222, determining whether the actual duration is greater than the preset duration; S223, when the actual duration is greater than the preset duration, turning off the burner and reducing the outlet temperature.

[0048] The beneficial effects of adopting the above-mentioned further technical solution are as follows: If any of the exhaust air temperatures (actual outlet temperatures) exceeds the optimal outlet temperature (preset outlet temperature limit) triggers a red alarm, the PLC controller automatically lowers the burner's set temperature. Based on previous test data, lowering the burner temperature to 60℃ ensures the avoidance of fire in the drying tower. If the outlet temperature still exceeds the red alarm value (red alarm limit), the burner is shut off to quickly reduce the outlet temperature, preventing over-drying of the grain and ensuring the quality of the dried grain and the interests of farmers.

[0049] Further, after step S21, the following steps are included: S23, when multiple actual outlet temperatures are all lower than the red alarm limit, determine whether any of the multiple actual outlet temperatures is higher than the yellow alarm limit; S24, when any of the multiple actual outlet temperatures is higher than the yellow alarm limit, select the two maximum values ​​among the multiple actual outlet temperatures and calculate the average of the two maximum values; S25, determine whether the average value is greater than a preset outlet temperature limit; S26, when the average value is greater than the preset outlet temperature limit, calculate the difference between the average value and the preset outlet temperature limit; S27, calculate the first actual discharge interval time based on the difference between the average value and the preset outlet temperature limit and the preset discharge interval time.

[0050] The beneficial effects of adopting the above-mentioned further technical solution are as follows: If any of the multiple exhaust temperature values ​​(actual outlet temperature) is greater than the yellow alarm limit but less than the red alarm limit, the PLC controller will not adjust the burner's set temperature value; at the same time, the two maximum values ​​among the multiple temperature values ​​are taken, and then the average value is taken. The average value is compared with the optimal outlet temperature limit (preset outlet temperature limit). If it is greater than the optimal outlet temperature value, the difference ΔT between the two is calculated. Then, the grain discharge interval time is reduced based on the set grain discharge interval time. According to Algorithm 1: Y1=Y+1.65*ΔT-3.69*ΔT^2+2.13*ΔT^3-0.58*ΔT^4+0.05*ΔT^5, the actual grain discharge time Y1 is calculated, thereby quickly discharging grain, reducing the outlet temperature, preventing over-drying of grain, and ensuring the quality of grain drying and the interests of farmers.

[0051] Further, after step S23, the following steps are included: S231, when multiple actual outlet temperatures are all lower than the yellow alarm limit, determine whether any of the multiple actual outlet temperatures is higher than the low temperature alarm limit; S232, when any of the multiple actual outlet temperatures is higher than the low temperature alarm limit, select the two maximum values ​​among the multiple actual outlet temperatures and calculate the average of the two maximum values; S233, determine whether the average value is lower than a preset outlet temperature limit; S234, when the average value is lower than the preset outlet temperature limit, calculate the difference between the average value and the preset outlet temperature limit; S235, calculate a third actual discharge interval time based on the difference between the average value and the preset outlet temperature limit and a preset discharge interval time.

[0052] The beneficial effects of adopting the above-mentioned further technical solution are as follows: multiple exhaust temperature values ​​(actual outlet temperature) are all less than the optimal outlet temperature setting value (preset outlet temperature limit) and greater than the low temperature alarm limit, so the PLC controller will not adjust the burner's set temperature value; at the same time, the two maximum values ​​among the multiple temperature values ​​are taken, and then the average value is taken. The average value is compared with the optimal outlet temperature limit. If it is less than the optimal outlet temperature value, the difference ΔT between the two is calculated. Based on the magnitude of the difference, the grain discharge interval time is increased on the basis of the set grain discharge interval time, thereby slowing down the grain discharge. According to Algorithm 3: Y3=Y+1.08*exp^(-ΔT / 2.97), the actual grain discharge time Y3 is calculated, which increases the outlet temperature, prevents the grain from not being dried, and ensures the quality of grain drying and the interests of farmers.

[0053] Further, after step S231, the following steps are included: S2311, when the temperatures of multiple actual air outlets are all less than the low temperature alarm limit, the fourth actual grain discharge interval time is calculated based on the preset grain discharge interval time.

[0054] The beneficial effects of adopting the above-mentioned further technical solution are: multiple exhaust temperature values ​​(actual outlet temperature) are all less than the low temperature alarm limit, and the PLC controller will not adjust the burner's set temperature value; at the same time, based on the set grain discharge interval time (preset grain discharge interval time), the grain discharge interval time needs to be increased significantly. Through algorithm 4: Y4 = Y + 30, the grain discharge is slowed down, the outlet temperature is increased, the grain is prevented from being uncooked, and the quality of grain drying and the interests of farmers are guaranteed.

[0055] Further, the first actual discharge interval time is calculated using the following formula: Y1=Y+1.65*ΔT-3.69*ΔT^2+2.13*ΔT^3-0.58*ΔT^4+0.05*ΔT^5, where Y1 is the first actual discharge interval time, Y is the preset discharge interval time, and ΔT is the difference between the average of the two maximum values ​​among multiple actual outlet temperatures and the preset outlet temperature limit; the second actual discharge interval time is calculated using the following formula: Y2=Y-30, where Y2 is the second actual discharge interval time. The grain discharge interval time, Y, is the preset grain discharge interval time; the third actual grain discharge interval time is calculated using the following formula: Y3=Y+1.08*exp^(-ΔT / 2.97), where Y3 is the third actual grain discharge interval time, Y is the preset grain discharge interval time, and ΔT is the difference between the average of the two maximum values ​​among multiple actual outlet temperatures and the preset outlet temperature limit; the fourth actual grain discharge interval time is calculated using the following formula: Y4=Y+30, where Y4 is the fourth actual grain discharge interval time, and Y is the preset grain discharge interval time.

[0056] The beneficial effects of adopting the above-mentioned further technical solution are as follows: By designing multiple algorithms corresponding to various scenarios, the actual grain discharge interval time can be accurately calculated. The actual outlet temperatures of multiple outlets are then analyzed and compared with red alarm limits, yellow alarm limits, and low-temperature alarm limits, facilitating accurate calculation and control of the grain discharge interval time, and improving stability, accuracy, and reliability. By changing the grain discharge interval time, users can control the moisture content of the grain at the outlet, preventing over-drying or under-drying, thus ensuring user profits.

[0057] For different types of grains being dried, optimal air outlet limits (preset air outlet temperature limits) are set separately.

[0058] The red alarm limit is equal to the optimal outlet temperature limit (preset outlet temperature limit) plus 5 degrees Celsius.

[0059] The yellow alarm limit is equal to the optimal outlet temperature limit.

[0060] The low temperature alarm limit is equal to the optimal outlet temperature limit minus 10 degrees Celsius;

[0061] Optimal outlet temperature setting (optimal outlet temperature limit): T1

[0062] Set the grain discharge interval time (preset grain discharge interval time) Y;

[0063] Actual grain discharge interval: Y1

[0064] ① If any of the four exhaust temperature values ​​(actual outlet temperature) exceeds the optimal outlet temperature (preset outlet temperature limit) triggers a red alarm: the PLC controller automatically lowers the burner's set temperature. Based on previous test data, lowering the burner temperature to 60℃ ensures the drying tower avoids the risk of fire. Simultaneously, the two highest values ​​of the four temperature values ​​(actual outlet temperature) are taken, and their average is calculated. This average is compared with the optimal outlet temperature limit (preset outlet temperature limit), and the difference is calculated as ΔT. At this point, a significant reduction in the grain discharge interval is urgently needed. Algorithm 2 formula: Y2 = Y - 30, is used to quickly discharge the grain. During this process, if the outlet temperature (actual outlet temperature) still exceeds the red alarm value (red alarm limit), the burner is shut off to rapidly lower the outlet temperature, preventing over-drying of the grain and ensuring the quality of the dried grain and the interests of farmers.

[0065] ② If any of the four exhaust temperature values ​​is greater than the yellow alarm limit but less than the red alarm limit, the PLC controller will not adjust the burner's set temperature value. It will take the two maximum values ​​from the four temperature values, then calculate the average value. This average value is compared with the optimal outlet temperature limit. If the average value is greater than the optimal outlet temperature value, the difference ΔT between the two is calculated. Based on the set grain discharge interval time, the grain discharge interval time is reduced. According to Algorithm 1 function Y1=Y+1.65*ΔT-3.69*ΔT^2+2.13*ΔT^3-0.58*ΔT^4+0.05*ΔT^5, the actual grain discharge time Y1 (first actual grain discharge time) is calculated, thereby quickly discharging the grain, reducing the outlet temperature, preventing over-drying of the grain, and ensuring the quality of the dried grain and the interests of farmers.

[0066] ③ If all four exhaust temperatures are lower than the optimal outlet temperature setting but higher than the low-temperature alarm limit, the PLC controller will not adjust the burner's set temperature. Simultaneously, the two highest values ​​among the four temperatures are taken, and the average value is compared with the optimal outlet temperature limit. If the average value is lower than the optimal outlet temperature, the difference ΔT is calculated. Based on the magnitude of this difference, the grain discharge interval is increased from the set interval to slow down the discharge. The actual discharge time Y3 (the third actual discharge time) is calculated using Algorithm 3 function Y3=Y+1.08*exp^(-ΔT / 2.97), increasing the outlet temperature to prevent uncooked grain and ensuring the quality of the dried grain and the interests of farmers.

[0067] ④ If all four exhaust temperatures are below the low-temperature alarm limit, the PLC controller will not adjust the burner's set temperature. At the same time, based on the set grain discharge interval time, the grain discharge interval time needs to be increased significantly. Through Algorithm 4 formula: Y4 = Y + 30, the grain discharge is slowed down, the outlet temperature is increased, the grain is prevented from being uncooked, and the quality of grain drying and the interests of farmers are guaranteed.

[0068] Farmers ultimately need the grain to have a moisture content of 15% after drying. If the moisture content at the export point is 13%, the grain will be over-dried, reducing the farmers' profits. If the moisture content at the export point is 17%, the grain will be under-dried and cannot be stored, resulting in losses for the farmers. The above strategy can prevent the grain from being over-dried.

[0069] This invention, through the arrangement of only four temperature sensors, can monitor the quality of grain drying, with a simple and easy-to-implement structure. Combining user experience with PLC electronic control programs, it ensures good consistency of grain moisture at the outlet, greatly reducing the frequency of user operations, improving user experience, and alleviating operational fatigue. By changing the grain discharge interval, users can control the moisture content of the grain at the outlet, ensuring user profits.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preventing over-drying in a continuous grain dryer, characterized in that, A continuous grain dryer anti-over-drying device is provided, comprising: a dryer body, a controller, and multiple temperature sensors. The dryer body has an exhaust side, and the multiple temperature sensors are installed on the exhaust side of the dryer body. The dryer body has a grain discharge gate, and the controller is connected to the multiple temperature sensors and the grain discharge gate respectively. The method for preventing over-drying in a continuous grain dryer includes: S1. Obtain the preset grain discharge interval time, the preset air outlet temperature limit, and multiple actual air outlet temperatures; S2. Analyze the relationship between multiple actual outlet temperatures and preset outlet temperature limits, and calculate the actual discharge interval time based on the relationship between multiple actual outlet temperatures and preset outlet temperature limits and the preset discharge interval time. S3. Control the discharge gate to discharge grain according to the actual grain discharge interval time; Step S1 includes: S11. Obtain the preset grain discharge interval time, the preset air outlet temperature limit, and multiple actual air outlet temperatures; S12. Based on the preset outlet temperature limit, set the red alarm limit, yellow alarm limit, and low temperature alarm limit; In step S12, the red alarm limit is equal to the preset outlet temperature limit plus 5 degrees Celsius, the yellow alarm limit is equal to the preset outlet temperature limit, and the low temperature alarm limit is equal to the preset outlet temperature limit minus 10 degrees Celsius. Step S2 includes: S21. Determine if any of the multiple actual outlet temperatures exceeds the red alarm limit. S22. When one of the multiple actual outlet temperatures is greater than the red alarm limit, reduce the preset temperature of the burner and calculate the second actual discharge interval time based on the preset discharge interval time. Step S22 includes: S221. When one of the multiple actual outlet temperatures is greater than the red alarm limit, reduce the preset temperature of the burner, calculate the second actual discharge interval time, obtain the preset duration, and record the actual duration for which the actual outlet temperature is greater than the red alarm limit. S222. Determine whether the actual duration is greater than the preset duration; S223. When the actual duration exceeds the preset duration, turn off the burner and reduce the outlet temperature.

2. The method for preventing over-drying in a continuous grain dryer according to claim 1, characterized in that, Step S21 and the following steps are included: S23. When multiple actual outlet temperatures are all lower than the red alarm limit, determine whether any of the multiple actual outlet temperatures are higher than the yellow alarm limit. S24. When there is an actual outlet temperature that is greater than the yellow alarm limit among multiple actual outlet temperatures, select the two maximum values ​​among the multiple actual outlet temperatures and calculate the average value of the two maximum values. S25. Determine whether the average value is greater than the preset outlet temperature limit; S26. When the average value is greater than the preset outlet temperature limit, calculate the difference between the average value and the preset outlet temperature limit. S27. Calculate the first actual grain discharge interval time based on the difference between the average value and the preset air outlet temperature limit and the preset grain discharge interval time.

3. A method for preventing over-drying in a continuous grain dryer according to claim 2, characterized in that, Step S23 is followed by: S231. When multiple actual outlet temperatures are all lower than the yellow alarm limit, determine whether any of the multiple actual outlet temperatures are higher than the low temperature alarm limit. S232. When there is an actual outlet temperature that is greater than the low temperature alarm limit among multiple actual outlet temperatures, select the two maximum values ​​among the multiple actual outlet temperatures and calculate the average value of the two maximum values. S233. Determine whether the average value is less than the preset outlet temperature limit; S234. When the average value is less than the preset outlet temperature limit, calculate the difference between the average value and the preset outlet temperature limit. S235. Calculate the third actual discharge interval time based on the difference between the average value and the preset outlet temperature limit and the preset discharge interval time.

4. A method for preventing over-drying in a continuous grain dryer according to claim 3, characterized in that, Step S231 followed by: S2311. When the temperature of multiple actual air outlets is less than the low temperature alarm limit, calculate the fourth actual grain discharge interval time based on the preset grain discharge interval time.

5. A method for preventing over-drying in a continuous grain dryer according to claim 4, characterized in that, The first actual grain discharge interval time is calculated using the following formula: Y1=Y+1.65*ΔT -3.69*ΔT ^2+2.13*ΔT ^3-0.58*ΔT ^4+0.05*ΔT ^5, Where Y1 is the first actual grain discharge interval time, Y is the preset grain discharge interval time, and ΔT is the difference between the average of the two maximum values ​​among the multiple actual air outlet temperatures and the preset air outlet temperature limit. The second actual grain discharge interval time is calculated using the following formula: Y2 = Y - 30, Wherein, Y2 is the second actual grain discharge interval time, and Y is the preset grain discharge interval time; The third actual grain discharge interval time is calculated using the following formula: Y3 = Y + 1.08 * exp^(-ΔT / 2.97), Where Y3 is the third actual grain discharge interval time, Y is the preset grain discharge interval time, and ΔT is the difference between the average of the two maximum values ​​among the multiple actual air outlet temperatures and the preset air outlet temperature limit. The fourth actual grain discharge interval time is calculated using the following formula: Y4 = Y + 30, Where Y4 is the fourth actual grain discharge interval time, and Y is the preset grain discharge interval time.

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