Dryer control system and method

Abstract

The invention provides a dryer control system and method. A drying machine control system comprises a drying tower, a grain storage bin, a grain stirring wheel motor, a combustor, a material level device, an alarm device and a controller, the grain storage bin is installed at the bottom of the drying tower, the combustor is installed on the drying tower, the grain stirring wheel motor is rotatably installed at the top of the grain storage bin, and the material level device is installed on the combustor. The material level indicator is installed on the grain storage bin, and the controller is connected with the grain stirring wheel motor, the combustor, the material level indicator and the alarm device.

Description

Technical Field

[0001] The present invention relates to the technical field of grain drying, and particularly to a dryer control system and method. Background Art

[0002] Grain drying is an important link in the whole process of mechanized grain production. After grain harvesting, storing grain by farmers is the most important link. Grain drying is an important technical link to make the high-moisture grain after harvesting reach an appropriate moisture content for storage or processing through certain technical treatments (processes and equipment). Grain drying is an effective means to ensure the quality and reduce losses of grain after production. It can greatly shorten the time required for high-moisture grain to drop to a safe moisture content after harvesting, and effectively avoid the loss of grain mildew caused by too long a high-moisture temporary storage period of grain.

[0003] The circulating dryer consists of a dryer body, a grain feeding wheel motor, a grain discharging cylinder, a lifting motor, a lifting grain cylinder, and a bottom conical bin. When the circulating dryer operates in a cycle, the un-dried grain inside the drying tower flows into the bottom conical storage bin by the power of the grain feeding wheel. The wet grain in the storage bin flows into the inlet of the elevator through the chute pipe at the bottom. The lifting motor drives the grain hoppers on the conveyor belt to lift the grain back to the inlet of the drying tower, completing one cycle process.

[0004] When the circulating dryer is drying, due to large foreign objects in the wet grain, high-humidity grain, or line problems, it may cause blockage of the elevator pipeline, which in turn leads to blockage of the bottom conical storage bin, and then causes the grain level in the conical storage bin to rise. When the wet grain in the conical storage bin rises to the grain feeding wheel, the wet grain in the drying tower will be in a static state. At this time, there is still a continuous flow of high-temperature hot air blowing into the drying tower. If not discovered in time, there will be a risk of fire in the drying tower, causing serious economic losses to users.

[0005] Since the control room is relatively far from the circulating dryer body, if the operator cannot discover the blockage problem in the conical bin in time, it will cause a fire in the circulating dryer, resulting in irreversible losses and economic losses to users. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a dryer control system and method in view of the deficiencies of the prior art.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: A dryer control system includes: a drying tower, a grain storage bin, a grain feeding wheel motor, a burner, a level gauge, an alarm device, and a controller. The grain storage bin is installed at the bottom of the drying tower, the burner is installed on the drying tower, the grain feeding wheel motor is rotatably installed on the top of the grain storage bin, the level gauge is installed on the grain storage bin, and the controller is respectively connected to the grain feeding wheel motor, the burner, the level gauge, and the alarm device.

[0008] The beneficial effects of adopting the technical solution of the present invention are: realizing the function of preventing the dryer from catching fire, with a simple structure and easy to implement. It can timely detect the problem of blocked grain in the grain storage bin and give an alarm in time, protecting the circulating dryer from catching fire and enabling the operator to discover this problem in time. There is no need for the operator to often observe the working state of the grain discharging cylinder, reducing the operator's fatigue.

[0009] Further, a hoist is provided on one side of the drying tower. The bottom of the hoist is connected to the bottom of the grain storage bin through a pipeline, and the top of the hoist is connected to the top of the drying tower through a pipeline.

[0010] The beneficial effect of adopting the above further technical solution is: The hoist is used to drive the grain hoppers on the conveyor belt to lift the grain back to the entrance of the drying tower to complete the circulation process.

[0011] Further, the grain storage bin is a conical grain storage bin; the level gauge is installed on the side wall of the grain storage bin.

[0012] The beneficial effect of adopting the above further technical solution is: The grain storage bin is a conical grain storage bin, which is convenient for the grain to flow into the bottom of the grain storage bin under its own gravity, so that the wet grain in the grain storage bin can flow into the entrance of the hoist through the grain chute at the bottom. The level gauge is installed on the side wall of the grain storage bin to detect the grain level in the grain storage bin.

[0013] Further, the grain feeding wheel motor is connected to a grain feeding wheel and a grain feeding wheel frequency converter. The grain feeding wheel is located on the top of the grain storage bin, and the controller is connected to the grain feeding wheel frequency converter.

[0014] The beneficial effect of adopting the above further technical solution is: It is convenient for the un-dried grain inside the drying tower to flow into the grain storage bin by the power of the grain feeding wheel. The grain feeding wheel frequency converter is used to adjust the rotation speed of the grain feeding wheel motor.

[0015] Further, the level gauge is a rotary vane level gauge, and the rotary vane level gauge has a rotating vane; the controller is a PLC controller, and a timer is provided inside the controller.

[0016] The beneficial effects of adopting the above further technical solution are as follows: When the grain level reaches the position of the rotary vane feeder, due to the resistance of the grain, the rotary vane of the feeder stops working, and the feeder outputs a high-level signal to the PLC controller. When the dryer control system receives this signal, it will turn on the alarm light and display the alarm information, and at the same time, it will reduce the rotation speed of the grain feeding wheel. If the alarm persists for a period of time and the operator does not take any measures, the dryer control system will automatically shut down the burner to prevent the dryer from catching fire.

[0017] Further, the alarm device includes: an alarm light and an HMI touch screen, and both the alarm light and the HMI touch screen are connected to the controller.

[0018] The beneficial effects of adopting the above further technical solution are as follows: The setting of the alarm light and the HMI touch screen is used to prompt grain blockage, which is convenient for users to take timely measures.

[0019] In addition, the present invention also provides a dryer control method. Based on any one of the above dryer control systems, the dryer control method includes: S1. During the drying operation, determine whether the grain level in the storage bin reaches the position of the feeder; S2. When the grain level in the storage bin reaches the position of the feeder, control the alarm device to alarm and reduce the rotation speed of the grain feeding wheel motor; S3. Determine whether the continuous alarm time of the alarm device is greater than the set value; S4. When the continuous alarm time of the alarm device is greater than the set value, turn off the burner.

[0020] The beneficial effects of adopting the technical solution of the present invention are as follows: When the grain level reaches the position of the feeder, due to the resistance of the grain, the rotary vane of the feeder stops working, and the feeder outputs a high-level signal to the controller. When the dryer control system receives this signal, it will turn on the alarm light and display the alarm information, and at the same time, it will reduce the rotation speed of the grain feeding wheel. If the alarm persists for a period of time and the operator does not take any measures, the dryer control system will automatically shut down the burner to prevent the dryer from catching fire. The function of preventing the dryer from catching fire is realized, and the structure is simple and easy to implement. It can timely detect the grain blockage problem in the storage bin and alarm in time, protect the circulating dryer from catching fire and let the operator discover this problem in time. There is no need for the operator to often observe the working state of the grain discharging cylinder, which reduces the fatigue of the operator.

[0021] Further, after step S1, it includes: when the grain level in the storage bin does not reach the position of the feeder, the alarm device does not alarm; the control of the alarm device to alarm in step S2 includes: turning on the alarm light and displaying the alarm information.

[0022] The beneficial effects of adopting the above further technical solution are as follows: Under normal working conditions, when the grain in the storage bin does not reach the position where the feeder is located, the dryer control system does not issue an alarm or information prompt.

[0023] Further, after step S4, the following steps are included: S5. Determine whether the grain level in the storage bin is lower than the position of the level sensor; S6. When the grain level in the storage bin is lower than the position of the level sensor, turn on the burner.

[0024] The beneficial effect of adopting the above further technical solution is that if the grain level in the storage bin is lower than the position of the level sensor again, the dryer control system automatically turns on the burner to continue the drying operation. After the grain jamming fault is repaired, the operation can be restarted.

[0025] Further, before step S1, the following steps are included: S11. According to the operation mode instruction input by the user, determine whether it is a drying operation or other operations; S12. During other operations, determine whether the grain level in the storage bin reaches the position of the level sensor; S13. When the grain level in the storage bin reaches the position of the level sensor, control the alarm device to give an alarm and reduce the rotation speed of the grain feeding wheel motor; S14. When the grain level in the storage bin does not reach the position of the level sensor, maintain the current operation.

[0026] The beneficial effect of adopting the above further technical solution is that according to the operation mode selected on the touch screen, it is further determined whether it is a drying operation or other operations. During non-drying mode operations, when the level sensor outputs a high-level signal, it indicates that the grain level in the storage bin has exceeded the position of the level sensor. The dryer control system decelerates the grain feeding wheel motor, lights up the alarm warning light, and the HMI touch screen interface displays relevant information about clearing grain jams. Since the burner does not need to be started during non-drying mode operations, the burner does not need to perform any actions.

[0027] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 One of the schematic structural diagrams of the dryer control system provided by an embodiment of the present invention.

[0029] Figure 2 Two of the schematic structural diagrams of the dryer control system provided by an embodiment of the present invention.

[0030] Figure 3 Three of the schematic structural diagrams of the dryer control system provided by an embodiment of the present invention.

[0031] Figure 4 One of the schematic flowcharts of the dryer control method provided by an embodiment of the present invention.

[0032] Figure 5 Two of the schematic flowcharts of the dryer control method provided by an embodiment of the present invention.

[0033] Description of the attached reference numerals: 1. Drying tower; 2. Grain storage bin; 3. Level indicator; 4. Elevator. Detailed implementation manners

[0034] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The illustrated embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0035] As Figures 1 to 3 shown, an embodiment of the present invention provides a dryer control system, including: a drying tower 1, a grain storage bin 2, a grain feeding wheel motor, a burner, a level indicator 3, an alarm device, and a controller. The grain storage bin 2 is installed at the bottom of the drying tower 1. The burner is installed on the drying tower 1. The grain feeding wheel motor is rotatably installed on the top of the grain storage bin 2. The level indicator 3 is installed on the grain storage bin 2. The controller is respectively connected to the grain feeding wheel motor, the burner, the level indicator 3, and the alarm device.

[0036] The beneficial effects of adopting the technical solution of the present invention are: realizing the function of preventing the dryer from catching fire, with a simple structure and easy to implement. It can timely detect the problem of blocked grain in the grain storage bin and give an alarm in time, protecting the circulating dryer from catching fire and allowing the operator to discover this problem in time. There is no need for the operator to often observe the working state of the grain discharging cylinder, reducing the operator's fatigue.

[0037] Among them, the user can connect the controller to the lifting motor and other actuating components according to actual needs, so as to automatically shut down the lifting motor and other actuating components when the grain is blocked, preventing the lifting motor and other actuating components from being burned out.

[0038] Since the operation time period of the circulating dryer is relatively long and the working noise of the dryer is relatively large. It is inevitable that the operator cannot always pay attention to the grain flow condition in the drying tower (drying tower) and the running state of various motors. It may be due to carelessness that the operator fails to notice the fault of blocked grain, resulting in the ablation of the lifting motor, and in severe cases, the dryer catches fire, causing economic losses to the user.

[0039] This solution not only enables the blocked grain fault to be converted into an electrical signal and detected in time, but also with the help of the PLC controller and the control logic program, the blocked grain problem can be detected in time, the power supply of the burner can be cut off, and various motors can be protected, avoiding the dryer from catching fire caused by the blocked grain in the conical grain storage bin.

[0040] The embodiment of the present invention allows the operator to easily discover such problems without going to the drying tower body, reducing the operator's fatigue.

[0041] As Figures 1 to 3As shown in the figure, further, a hoist 4 is provided on one side of the drying tower 1. The bottom of the hoist 4 is connected to the bottom of the grain storage bin 2 through a pipeline, and the top of the hoist 4 is connected to the top of the drying tower 1 through a pipeline.

[0042] The beneficial effect of adopting the above further technical solution is that the hoist is used to drive the grain hoppers on the conveyor belt to lift the grain back to the entrance of the drying tower to complete the circulation process.

[0043] As Figures 1 to 3 shown in the figure, further, the grain storage bin 2 is a conical grain storage bin; the level indicator 3 is installed on the side wall of the grain storage bin 2.

[0044] The beneficial effect of adopting the above further technical solution is that the grain storage bin is a conical grain storage bin, which is convenient for the grain to flow into the bottom of the grain storage bin under its own gravity, so that the wet grain in the grain storage bin can flow into the entrance of the hoist through the chute pipe at the bottom. The level indicator is installed on the side wall of the grain storage bin to detect the grain level in the grain storage bin.

[0045] Among them, the level indicator 3 can be vertically arranged with the side wall of the grain storage bin 2.

[0046] As Figures 1 to 3 shown in the figure, further, the grain distributing wheel motor is connected with a grain distributing wheel and a grain distributing wheel frequency converter. The grain distributing wheel is located at the top of the grain storage bin 2, and the controller is connected with the grain distributing wheel frequency converter.

[0047] The beneficial effect of adopting the above further technical solution is that it is convenient for the un-dried grain inside the drying tower to flow into the grain storage bin by the power of the grain distributing wheel. The grain distributing wheel frequency converter is used to adjust the rotation speed of the grain distributing wheel motor.

[0048] As Figures 1 to 3 shown in the figure, further, the level indicator 3 is a rotary vane level indicator, and the rotary vane level indicator has a rotating vane; the controller is a PLC controller, and a timer is arranged inside the controller.

[0049] The beneficial effect of adopting the above further technical solution is that when the grain level reaches the position of the rotary vane level indicator, due to the resistance of the grain, the rotating vane of the level indicator stops working, and the level indicator outputs a high-level signal to the PLC controller. When the drying machine control system receives this signal, it will light up the alarm lamp and display the alarm information, and at the same time, it will reduce the rotation speed of the grain distributing wheel. If the alarm continues for a period of time and the operator does not take any treatment measures, the drying machine control system will automatically shut down the burner to prevent the drying machine from catching fire.

[0050] Further, the alarm device includes: an alarm lamp and an HMI touch screen, and both the alarm lamp and the HMI touch screen are connected to the controller.

[0051] The beneficial effect of adopting the above further technical solution is that the setting of the alarm light and the HMI touch screen is used to prompt the grain blockage, so that the user can take timely treatment measures.

[0052] Among them, HMI is the abbreviation of Human Machine Interface, commonly known as "human-machine interface" or human-machine interface.

[0053] The embodiment of the present invention can timely discover the grain blockage problem of the conical grain silo (grain storage silo) and issue an alarm in time, thereby protecting the circulating dryer (dryer) from fire and allowing the operator to discover the problem in time.

[0054] The grain wheel motor, elevator, bottom conical grain bin (grain storage bin), and material level sensor (grain storage bin) are important components of the circulating dryer. It is not allowed for the circulating dryer to catch fire due to abnormal problems such as grain blockage. Such faults need to be identified and corresponding protective measures taken to protect the circulating dryer from fire.

[0055] 1. The embodiment of the present invention only arranges a rotation level device above the conical grain storage bin at the bottom of the dryer, and combines the frequency converter (grain wheel frequency converter) and grain wheel motor of the control system itself to achieve the function of preventing the dryer from catching fire. The structure is simple and easy to implement; protect this structural design.

[0056] 2. The embodiment of the invention combines the accumulated experience of users and converts it into a PLC electronic control program to solve the problem of grain blockage failure not being discovered in time and causing serious economic losses; protect the control logic.

[0057] 3. The embodiments of the invention can detect grain blockage faults in a timely manner, eliminating the need for operators to frequently observe the working status of the grain discharge cylinder, thereby reducing operator fatigue.

[0058] like Figure 4 As shown, in addition, the present invention also provides a dryer control method, based on a dryer control system described in any one of the above, the dryer control method includes: S1, during drying operation, judging whether the grain level in the grain storage bin has reached the position of the level indicator; S2, when the grain level in the grain storage bin reaches the position of the level indicator, controlling the alarm device to alarm and reducing the speed of the grain wheel motor; S3, judging whether the continuous alarm time of the alarm device is greater than the set value; S4, when the continuous alarm time of the alarm device is greater than the set value, turning off the burner.

[0059] The beneficial effects of adopting the technical solution of the present invention are as follows: When the grain level reaches the position of the level detector, due to the resistance of the grain, the rotating blades of the level detector stop working, and the level detector outputs a high-level signal to the controller. When the drying machine control system receives this signal, it will turn on the alarm light and display the alarm information, and at the same time reduce the rotation speed of the grain conveying wheel. If the alarm persists for a period of time and the operator does not take any measures, the drying machine control system will automatically shut down the burner to prevent the drying machine from catching fire. The function of preventing the drying machine from catching fire is realized, and the structure is simple and easy to implement. It can timely detect the problem of blocked grain in the storage bin and give an alarm in time, protect the circulating drying machine from catching fire and let the operator discover this problem in time. There is no need for the operator to often observe the working state of the grain discharging cylinder, which reduces the fatigue of the operator.

[0060] As Figure 5 shown, according to the operation mode input by the user, 1. Determine whether it is a drying operation; 2. If so, determine whether the level detector outputs a signal; 3. If so, the alarm light rings & the HMI displays a prompt message & reduce the rotation speed of the grain conveying wheel; 4. Determine whether the signal output by the level detector & the duration is greater than a certain value; 5. If so, determine blocked grain & stop the burner.

[0061] After step 2, it further includes: If not, maintain the current operation & turn on the burner.

[0062] After step 1, it includes: 11. If not, determine whether the level detector outputs a signal; 12. If so, the alarm light rings & the HMI interface displays a prompt message & reduce the rotation speed of the grain conveying wheel; 13. If not, maintain the current operation.

[0063] Further, after step S1, it includes: When the grain level in the storage bin does not reach the position of the level detector, the alarm device does not give an alarm; The control for the alarm device to give an alarm in step S2 includes: turning on the alarm light and displaying the alarm information.

[0064] The beneficial effects of adopting the above further technical solution are: Under normal working conditions, when the grain in the storage bin does not reach the position where the level detector is located, the drying machine control system does not issue an alarm and information prompt.

[0065] Further, after step S4, it includes: S5. Determine whether the grain level in the storage bin is lower than the position of the level detector; S6. When the grain level in the storage bin is lower than the position of the level detector, turn on the burner.

[0066] The beneficial effects of adopting the above further technical solution are: If the grain level in the storage bin is lower than the position of the level detector again, the drying machine control system automatically turns on the burner and continues the drying operation. After the blocked grain fault is repaired, the operation can be resumed.

[0067] Further, before step S1, the following steps are included: S11. Determine whether it is a drying operation or other operations according to the operation mode instruction input by the user; S12. During other operations, determine whether the grain level in the storage bin reaches the position of the level gauge; S13. When the grain level in the storage bin reaches the position of the level gauge, control the alarm device to give an alarm and reduce the rotation speed of the grain feeding wheel motor; S14. When the grain level in the storage bin does not reach the position of the level gauge, maintain the current operation.

[0068] The beneficial effects of adopting the above further technical solution are as follows: The operation mode is selected according to the touch screen, and then it is determined whether it is a drying operation or other operations. When operating in the non-drying mode, when the level gauge outputs a high-level signal, it indicates that the grain level in the storage bin has been higher than the position of the level gauge. The drying machine control system decelerates the grain feeding wheel motor, lights up the alarm warning light, and the HMI touch screen interface displays relevant information on cleaning and blocking of grain. Since the burner does not need to be started during the non-drying mode operation, the burner does not need to perform any actions.

[0069] The embodiment of the present invention is composed of a PLC (controller), a rotary vane level switch (level gauge), and a grain feeding wheel frequency converter. Under normal working conditions, when the grain in the conical storage bin (storage bin) does not reach the position where the rotary vane level switch (level gauge) is located, the drying machine control system does not give an alarm or information prompt. When the grain level reaches the position of the rotary vane level switch (level gauge), due to the resistance of the grain, the rotating vane of the rotary vane level switch stops working, and the rotary vane level switch outputs a high-level signal to the PLC controller (controller). When the drying machine control system receives this signal, it will light up the alarm lamp and display the alarm information, and at the same time reduce the rotation speed of the grain feeding wheel. If the alarm lasts for a period of time and the operator does not take any treatment measures, the drying machine control system will automatically shut down the burner to prevent the drying machine from catching fire. If the grain level in the conical storage bin is lower than the position of the rotary vane level switch again, the drying machine control system will automatically start the burner and continue the drying operation.

[0070] 1. Select the operation mode according to the touch screen (HMI touch screen), and then determine whether it is a drying operation or other operations.

[0071] 2. Determine the next action of the circulating drying machine control system according to the output signal of the rotary vane level switch.

[0072] 3. When operating in the drying mode, when the rotary vane level switch outputs a high-level signal, it indicates that the grain level in the conical storage bin has been higher than the position of the rotary vane level switch. The drying machine control system decelerates the grain feeding wheel motor, lights up the alarm warning light, and the HMI touch screen interface displays relevant information on cleaning and blocking of grain. At the same time, the PLC of the drying machine control system starts internal timing. If the timing time > the set value, the burner will be stopped. After the grain blocking fault is repaired, the drying machine control system automatically restarts the burner and enters the drying operation mode.

[0073] 4. When operating in the non-drying mode (other operations), if the output signal of the rotary level indicator is at a high level, it indicates that the grain level in the conical storage bin has exceeded the position of the rotary level indicator. The drying machine control system decelerates the grain feeding wheel motor, lights up the alarm warning light, and the HMI touch screen interface displays relevant information on blocked grain cleaning. Since the burner does not need to be started in the non-drying mode operation, the burner does not need to perform any actions.

[0074] 5. Re-operation is only allowed after the blocked grain fault has been repaired.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements 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 dryer control system, characterized in that, Including: A drying tower, a grain storage bin, a grain conveying wheel motor, a burner, a level gauge, an alarm device, and a controller. The grain storage bin is installed at the bottom of the drying tower. The burner is installed on the drying tower. The grain conveying wheel motor is rotatably installed on the top of the grain storage bin. The level gauge is installed on the grain storage bin. The controller is respectively connected to the grain conveying wheel motor, the burner, the level gauge, and the alarm device.

2. The drying machine control system according to claim 1, wherein, A hoist is provided on one side of the drying tower. The bottom of the hoist is connected to the bottom of the grain storage bin through a pipeline. The top of the hoist is connected to the top of the drying tower through a pipeline.

3. The drying machine control system according to claim 1, wherein The grain storage bin is a conical grain storage bin; the level gauge is installed on the side wall of the grain storage bin.

4. The drying machine control system according to claim 1, characterized in that, The grain conveying wheel motor is connected to a grain conveying wheel and a grain conveying wheel frequency converter. The grain conveying wheel is located on the top of the grain storage bin. The controller is connected to the grain conveying wheel frequency converter.

5. The drying machine control system according to claim 1, characterized in that The level gauge is a rotary vane level gauge, and the rotary vane level gauge has a rotating vane; the controller is a PLC controller, and a timer is provided inside the controller.

6. The drying machine control system according to claim 1, characterized in that, The alarm device includes: an alarm lamp and an HMI touch screen, and both the alarm lamp and the HMI touch screen are connected to the controller.

7. A dryer control method, characterized in that, Based on the dryer control system according to any one of the above claims 1 to 6, the dryer control method includes: S1. During the drying operation, determine whether the grain level in the grain storage bin reaches the position of the level gauge; S2. When the grain level in the grain storage bin reaches the position of the level gauge, control the alarm device to give an alarm, and reduce the rotation speed of the grain conveying wheel motor; S3. Determine whether the continuous alarm time of the alarm device is greater than the set value; S4. When the continuous alarm time of the alarm device is greater than the set value, turn off the burner.

8. A dryer control method according to claim 7, characterized in that, After step S1 includes: when the grain level in the grain storage bin does not reach the position of the level gauge, the alarm device does not give an alarm; controlling the alarm device to give an alarm in step S2 includes: turning on the alarm lamp and displaying the alarm information.

9. A dryer control method according to claim 7, characterized in that, After step S4 includes: S5. Determine whether the grain level in the grain storage bin is lower than the position of the level gauge; S6. When the grain level in the grain storage bin is lower than the position of the level gauge, turn on the burner.

10. A dryer control method according to claim 7, characterized in that, Before step S1 includes: S11. According to the operation mode instruction input by the user, determine whether it is a drying operation or other operations; S12. During other operations, determine whether the grain level in the grain storage bin reaches the position of the level gauge; S13. When the grain level in the grain storage bin reaches the position of the level gauge, control the alarm device to give an alarm, and reduce the rotation speed of the grain conveying wheel motor; S14. When the grain level in the grain storage bin does not reach the position of the level gauge, maintain the current operation.

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