Grain drying online moisture monitoring method and system

Abstract

The invention discloses a grain drying on-line moisture monitoring method and system, and relates to the technical field of grain drying. A moisture sensor is installed at a grain discharging section of drying equipment; when the drying equipment works, online multi-point correction is carried out when the instrument displays moisture data; after grain feeding of the drying equipment is finished, circularly operating for set time, and sampling after moisture display is stable; when the error between the moisture displayed by the instrument and the actual moisture reaches a set condition, correcting the error; and when the water content in the drying equipment is lower than a preset alarm value, the grain discharge standard is reached. According to the invention, the moisture content of uniformly flowing grain particles can be accurately and continuously measured in the production process, and the monitoring data is closest to the actual drying result; the original drying tower structure is not influenced, and the automation degree of the grain drying process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of grain drying, and in particular to an online moisture monitoring method and system for grain drying. Background Art

[0002] Drying is an important part of the whole mechanization of grain production and an important guarantee for a bumper grain harvest. According to statistics, the loss of grain after harvest is as high as 5% due to mildew and germination, because the moisture content does not reach the safe storage standard after drying or drying. The grain drying moisture monitoring system is an important factor in ensuring food safety and user benefits. The prior art discloses some moisture monitoring solutions, such as:

[0003] Chinese invention patent CN105510359A discloses an online moisture monitoring system for grain drying, including a cylindrical grain drying bin, in which an online moisture monitoring component is arranged, and the online moisture monitoring component is composed of four groups, namely, an upper axis monitoring component, a lower axis monitoring component and two side wall monitoring components, the upper axis monitoring component and the lower axis monitoring component are both arranged at the axis of the grain drying bin, and the two side wall monitoring components are respectively arranged on the inner side walls on both sides of the grain drying bin. The online moisture monitoring component of this scheme includes a sampling tube, a microwave signal transmitter and a microwave signal receiver, and a sampling funnel is arranged at the upper end of the sampling tube; its structure is relatively complex, and it occupies a large space in the drying bin, which is easy to affect the normal flow of grain in the drying bin.

[0004] Chinese invention patent CN106227038A discloses an intelligent control method for a grain drying tower based on neural network and fuzzy control. The hardware includes a temperature / moisture sensor, a data acquisition and processing module, and an input and display module. The temperature / moisture sensor collects temperature and moisture information. The data acquisition and processing module controls drying parameters according to the temperature and moisture information. The input and display module is used for human-computer interaction. The initial value of the drying data is set according to the drying experience. The system is trained for fuzzy control and a control rule table is drawn. Sampling is performed during the drying process to correct errors. It adopts a neural network method, the process is complex, and many factors are involved. It is not direct enough to obtain moisture data. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an online moisture monitoring method and system for grain drying, which can accurately and continuously measure the moisture content of uniformly flowing grain particles during the production process, and the monitoring data is closest to the actual drying result; it has no effect on the original drying tower structure and improves the degree of automation of the grain drying process.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides an online moisture monitoring method for grain drying, wherein a moisture sensor is installed in the grain discharge section of the drying equipment; when the drying equipment is operating, online multi-point correction is performed on the moisture data displayed by the instrument; after the drying equipment finishes feeding the grain, a cycle is run for a set time, and sampling is taken after the moisture display stabilizes; when the error between the moisture displayed by the instrument and the actual moisture reaches a set condition, error correction is performed; when the moisture content in the drying equipment is lower than a preset alarm value, the grain discharge standard is met.

[0008] As a further implementation method, the online multi-point calibration is implemented as follows: multiple calibration points are selected, and after the drying equipment is set to operate for a certain time, a monitoring instrument is used to monitor the moisture value at each calibration point; and the monitoring data is adjusted to be consistent with the monitoring instrument data.

[0009] As a further implementation method, a calibration point is selected at each set distance in the drying section, and sampling can be performed multiple times for comparison and adjustment.

[0010] As a further implementation method, the moisture sensor is arranged in the middle of the grain discharge section of the drying equipment.

[0011] As a further implementation method, error correction is performed after the grain discharge cycle is set for a number of times, and the moisture correction range of the error correction is ±9.9%.

[0012] As a further implementation, when the water content is lower than the alarm value, a buzzer sounds an alarm.

[0013] As a further implementation, when the buzzer alarm reaches a set number of times, the drying device automatically shuts down.

[0014] As a further implementation method, after the drying tower finishes feeding and starts circulating for a set time, observe that the moisture display is stable and then take samples and adjust them to be consistent.

[0015] In the second aspect, an embodiment of the present invention also provides an online moisture monitoring system for grain drying, including a moisture sensor, a programmable controller, a moisture meter host and a human-machine interface. The moisture sensor is used to detect the moisture value in the drying equipment in real time. The moisture sensor is connected to the moisture meter host, the programmable controller and the human-machine interface via cables respectively; the programmable controller is used to transmit the moisture data to the human-machine interface, and the human-machine interface is used to display the moisture data.

[0016] As a further implementation, a buzzer is also included, and the buzzer is connected to a programmable controller.

[0017] As a further implementation method, the moisture sensor is installed in the middle of the grain discharge section of the drying equipment, and the installation surface of the moisture sensor is inclined at a set angle.

[0018] The beneficial effects of the present invention are as follows:

[0019] The moisture sensor of the present invention is installed in the middle of the grain discharge section, and can accurately and continuously measure the moisture content of the uniformly flowing grain particles during the production process, and the monitoring data is closest to the actual drying result; and when the drying equipment is in operation, when the instrument displays moisture data, online multi-point calibration is performed, which makes the calibration curve more ideal and the error smaller; when the error between the moisture displayed by the instrument and the actual moisture is large, error correction is performed to further ensure the monitoring accuracy; when the moisture alarm exceeds the set number of times, the machine is automatically shut down, thereby improving the automation of the grain drying process. The present invention is easy to obtain accurate moisture data and is convenient for operators to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 The present invention is a schematic diagram of a moisture sensor installation according to one or more embodiments. Figure 1 ;

[0022] Figure 2 The present invention is a schematic diagram of a moisture sensor installation according to one or more embodiments. Figure 2 .

[0023] Among them, 1. Drying equipment, 2. Grain discharge section, 3. Moisture sensor. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0025] Embodiment 1:

[0026] This embodiment provides a method for monitoring moisture content of grain during drying, comprising the following steps:

[0027] a. Figure 1 and Figure 2 As shown, a moisture sensor 3 is installed in the grain discharge section 2 of the drying equipment 1, and the moisture sensor 3 is connected to the moisture meter host, programmable controller, and human-machine interface.

[0028] Among them, the moisture sensor 3 is installed in the center position of the grain discharge section 2, which can accurately and continuously measure the moisture content of the uniformly flowing grain particles during the production process, and the monitoring data is closest to the actual drying result. In addition, the installation surface of the moisture sensor 3 is at a certain tilt angle; the installation surface of the moisture sensor 3 of this embodiment is 45 degrees to the horizontal plane, and the grain fluidity is good. This position can ensure that there is no blockage or hanging of the material. Compared with the handheld moisture meter, this embodiment uses a moisture sensor 3, which is small in size and easy to install. It can adapt to the harsh environmental conditions of the grain drying site, has no effect on the original drying tower structure, is not affected by the external environment and operational errors, and the detection results are more accurate.

[0029] b. Set the type of moisture sensor 3.

[0030] c. When the drying equipment 1 is in operation, when the instrument displays moisture data, online multi-point calibration is performed. The online multi-point calibration can take into account the inconsistency of high and low moisture errors. The specific implementation method is:

[0031] After about 1 hour of drying cycle operation, observe that the moisture display is normal and stable, take samples, use handheld automatic instrument to monitor the moisture value, adjust the monitoring data to be consistent with the data of the automatic monitoring instrument, and continue to run. The second calibration point, the third calibration point, and the fourth calibration point should be reasonably selected in the entire drying section. During this period, you can take several more samples for comparison and adjustment until the entire drying is completed. At this point, the online multi-point calibration is completed. This method makes the calibration curve more ideal and the error smaller.

[0032] d. After several grain discharge cycles, when the error between the moisture displayed by the instrument and the actual moisture is large, the error can be corrected. This correction only requires the instrument to exit the automatic monitoring state and return to the moisture display state, and press the function key to enter the moisture correction state for adjustment. The moisture correction range is ±9.9%.

[0033] e. Through the programmable controller, the moisture data of the dried grain is uploaded to the human-machine interface screen in real time.

[0034] f. Set the alarm value for moisture content after drying. If the moisture content is lower than the alarm value, the buzzer alarm will remind the operator to dry the moisture content to meet the grain discharge standard, thus protecting the safe storage of grain.

[0035] g. If the moisture alarm exceeds the set number of times (for example, 3 times), the machine will automatically shut down, thereby improving the degree of automation of the grain drying process.

[0036] This embodiment allows the grain to completely cover the sensing surface and the grain to flow evenly without impurities, and the moisture measurement error is ≤±0.5% (within the main moisture range). The method is simple and easy, and the measurement is fast and accurate. This embodiment can reduce the cost of manual monitoring and can monitor the drying of crops such as corn, soybeans, wheat, rapeseed, and sorghum.

[0037] Embodiment 2:

[0038] This embodiment provides a grain drying online moisture monitoring system. Figure 1 As shown, it includes a moisture sensor 3, a buzzer, a programmable controller, a moisture meter host and a human-machine interface. The moisture sensor 3 is used to detect the moisture value in the drying equipment 1 in real time. The moisture sensor 3 is installed in the middle position of the grain discharge section 2 of the drying equipment 1, and the installation surface of the moisture sensor 3 is at a set inclination angle to ensure accurate and continuous measurement of the grain.

[0039] The moisture sensor 3 is connected to the moisture meter host, programmable controller, and human-machine interface through cables; the programmable controller is used to transmit moisture data to the human-machine interface, and the human-machine interface is used to display moisture data. The buzzer is connected to the programmable controller. When the moisture content detected by the moisture sensor 3 is lower than the alarm value, the buzzer alarm will remind the operator to dry the moisture to meet the grain discharge standard.

[0040] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for monitoring moisture content of grain during drying, characterized in that: Install a moisture sensor in the grain discharge section of the drying equipment; when the drying equipment is in operation, perform online multi-point calibration on the moisture data displayed on the instrument; after the drying equipment has finished feeding the grain, run it in a cycle for a set time, and take samples after the moisture display stabilizes; when the error between the moisture displayed by the instrument and the actual moisture reaches the set condition, perform error correction; when the moisture content in the drying equipment is lower than the preset alarm value, the grain discharge standard is met.

2. A grain drying online moisture monitoring method according to claim 1, characterized in that: The online multi-point calibration is implemented by selecting a plurality of calibration points, setting the drying equipment operation time, using a monitoring instrument to monitor the moisture value at each calibration point; and adjusting the monitoring data to be consistent with the monitoring instrument data.

3. A grain drying online moisture monitoring method according to claim 2, characterized in that: A calibration point is selected at each set distance in the drying section, and multiple samples can be taken for comparison and adjustment.

4. A method for monitoring grain moisture online during drying according to claim 1, characterized in that: The moisture sensor is arranged in the middle of the grain discharge section of the drying equipment.

5. The method for online moisture monitoring of grain drying according to claim 1, characterized in that: After the grain discharge cycle is set for a certain number of times, error correction is performed, and the moisture correction range of the error correction is ±9.9%.

6. A grain drying online moisture monitoring method according to claim 1, characterized in that: When the water content is lower than the alarm value, the buzzer will sound.

7. A grain drying online moisture monitoring method according to claim 6, characterized in that: When the buzzer alarm reaches the set number of times, the drying equipment automatically stops.

8. A grain drying online moisture monitoring system, characterized in that: It includes a moisture sensor, a programmable controller, a moisture meter host and a human-machine interface. The moisture sensor is used to detect the moisture value in the drying equipment in real time. The moisture sensor is connected to the moisture meter host, the programmable controller and the human-machine interface through cables respectively; the programmable controller is used to transmit the moisture data to the human-machine interface, and the human-machine interface is used to display the moisture data.

9. The grain drying online moisture monitoring system according to claim 8, characterized in that: The utility model also comprises a buzzer, and the buzzer is connected to the programmable controller.

10. The grain drying online moisture monitoring system according to claim 8, characterized in that: The moisture sensor is installed in the middle of the grain discharge section of the drying equipment, and the installation surface of the moisture sensor is at a set inclination angle.

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