CN-121297444-B - Grain drying system capable of switching continuous and circulating modes

CN121297444BCN 121297444 BCN121297444 BCN 121297444BCN-121297444-B

Abstract

The invention relates to the technical field of grain drying and discloses a grain drying system capable of switching continuous and circulating modes, which comprises a mode control module, a continuous working processing module, a circulating working processing module, a detection and sensing module, an intelligent regulation and control module, a valve execution module and a safety protection module, wherein when grain drying is carried out, the continuous working mode and the circulating working mode are selected and switched by the mode control module based on a grain moisture detection result and a system load state, and when the initial moisture is higher and the processing capacity is high, the continuous mode is preferentially adopted; when the drying materials with the moisture close to the target value or small-batch drying is processed, the drying materials are switched to a circulation mode, the optimal drying mode can be dynamically matched according to the characteristics of the drying quantity, the moisture of grains, varieties and the like, the high-moisture grains are ensured to be dried efficiently by adopting a plurality of dryers to operate in series, the low-moisture grains are ensured to be dried by adopting a single dryer to operate in a circulation mode so as to avoid excessive drying, and the drying adaptability of the system to different grain types and the accuracy of mode selection are improved.

Inventors

BAO LIWEI
ZHOU HONGKUI
ZOU JIANG
WANG ZHENXING

Assignees

江苏鹤丰农业发展有限公司

Dates

Publication Date: 20260508
Application Date: 20251212

Claims (10)

1. A grain drying system capable of switching between continuous and circulating modes is characterized by comprising: The mode control module is used for switching the working mode of the system by controlling the combination of the feeding gate valve and the three-way valve, and comprises a continuous working mode and a circulating working mode, wherein the continuous working mode is used for configuring a plurality of dryers to operate in series, grains are sequentially dried in a relay mode through the dryers, each dryer is independently operated in the circulating working mode, and the grains are dried in a circulating mode in a single dryer until the moisture is safely stored; the continuous working processing module is used for coordinating linkage operation of the feeding system, the dryer group and the discharging system in a continuous working mode, feeding the dryer group through the feeding system, monitoring the material level height through a material level sensor, adjusting the discharging speed through a variable-frequency discharging valve to control the drying time length, reducing the grain moisture by a plurality of dryers in a relay way, and finally discharging after cooling through a ventilation bin; The circulating work processing module is used for independently controlling the feeding and discharging processes of each dryer under a circulating work mode, and circulating grains in the dryer through the combination of the three-way valves until the sampling detection moisture reaches a preset target value and then is discharged, so that closed-loop drying of a single device is realized; the detection and sensing module is used for collecting the moisture content, the material level height, the grain temperature and the environmental parameters of the grain in real time, and comprises a high material level sensor, a moisture detector and a grain temperature sensor, wherein detection data are used for controlling the drying process in a feedback manner; The intelligent regulation and control module is used for calculating the precipitation amount and the hot air temperature required by drying based on the data of the detection and sensing module, and dynamically adjusting the heat supply parameters of the hot air heater by adopting a PID algorithm so as to respond to the grain temperature change; The valve execution module is used for operating the on-off and the adjustment of the feeding gate valve, the three-way valve and the variable-frequency discharge valve, realizing the control of material flow according to the instruction of the mode control module, and maintaining stable flow without interruption; The safety protection module is used for automatically triggering an emergency shutdown mechanism when abnormal conditions including overhigh temperature, water detection failure, valve blockage and motor overload are detected, reminding operators to intervene through the audible and visual alarm, and recording event logs for subsequent analysis.
2. The grain drying system capable of switching between continuous and circulating modes according to claim 1, wherein the mode control module comprises a valve control unit and a mode switching logic unit; The valve control unit is used for controlling the opening and closing sequence of the feeding gate valve and the flow direction configuration of the three-way valve according to the requirement of the working mode, the three-way valve is arranged to enable grains to flow to the next dryer in sequence in the continuous working mode, and the three-way valve is arranged to enable the grains to return to the local circulation treatment in the circulation working mode; The mode switching logic unit is used for switching modes based on grain moisture detection results and system load states, and is preferably used for a continuous mode when the initial moisture is higher and the drying amount is large, and switching to a circulating mode when the moisture is close to a target value, the drying amount is small and the varieties are multiple.
3. The grain drying system capable of switching between continuous and circulating modes according to claim 1, wherein the continuous operation processing module comprises a feeding coordination unit and a discharging regulation and control unit; The feeding coordination unit is used for sending grains to a first dryer through a feeding mechanism, triggering a switch of the feeding gate coordination unit by using a high material level sensor, and opening a discharging line of the machine to a next dryer; The discharge regulation and control unit synchronizes the discharge frequency of the first dryer to the plurality of subsequent dryers in a continuous working mode so as to achieve the same discharge speed, and can also set a flow sensing module in the conveying section of the dryer for measuring the actual discharge flow, dynamically adjust the frequency of a discharge valve based on the real-time flow data of each dryer and realize synchronous control of the discharge flow of the plurality of dryers.
4. The grain drying system capable of switching between continuous and circulating modes according to claim 1, wherein the circulating work processing module comprises a circulating runner unit and a moisture monitoring unit; the circulating runner unit is used for constructing an internal circulating path of grains through the three-way valve and the lifting machine, forming a closed-loop flowing mode of grains in the dryer, periodically sampling and detecting grain moisture through the moisture monitoring unit, automatically triggering discharging operation when the moisture value reaches a target value, otherwise, continuously circulating drying, and uploading monitoring data to the intelligent regulation and control module in real time for dynamically adjusting drying parameters.
5. The grain drying system capable of switching between continuous and circulating modes according to claim 1, wherein the detection and sensing module comprises a moisture detection unit, a material level monitoring unit and a temperature sensing unit; The moisture detection unit adopts an online moisture meter to measure the moisture content of grains in real time, calculates the precipitation of each dryer in a continuous mode, tracks the variation trend of single machine moisture in a circulating mode, and judges the drying end point; The material level monitoring unit monitors the height of grains in the dryer in real time through a high material level sensor and a low material level sensor, forms a linkage control mechanism with the feeding valve executing module in a continuous mode, and triggers corresponding feeding valve action based on a comparison result of the material level height and a preset threshold value; the temperature sensing unit collects temperature data in the drying chamber through the grain temperature sensor, provides comprehensive thermal parameters by combining with the environment temperature and humidity sensor, and provides feedback input for the intelligent regulation and control module.
6. The grain drying system capable of switching between continuous and circulating modes according to claim 1, wherein said intelligent control module comprises a precipitation calculation unit and a temperature control unit; The precipitation calculation unit is used for distributing a single precipitation task according to the total precipitation amount and the number of the dryers, determining the optimal discharging speed according to the inverse relation between the rated precipitation rate and the rated frequency of the discharging valve, and recalculating parameters when moisture deviation is detected; The temperature control unit adopts a PID algorithm to adjust the outlet temperature of the air heater, dynamically adjusts the heat supply intensity based on the data of the grain temperature sensor, and automatically reduces the outlet air temperature of the air heater in proportion when the detection value of the grain temperature sensor exceeds a preset safety range, and maintains the grain temperature within a set threshold range.
7. The grain drying system with switchable continuous and circulating modes according to claim 6, wherein the precipitation calculation unit is configured to calculate total precipitation according to a difference between an initial moisture value and a target moisture value, and to evenly distribute the total precipitation to a single dryer based on the number of dryers, and dynamically calculate an optimal operating frequency of the variable frequency discharge valve according to an inverse relationship among a system reference frequency, a single rated precipitation rate, and a real-time moisture difference.
8. The grain drying system capable of switching between continuous and circulating modes according to claim 1, wherein the valve executing module comprises a valve driving unit and a flow stabilizing unit; the valve driving unit is used for operating the feeding gate valve and the three-way valve after receiving the control signal, realizing valve positioning by adopting a closed-loop control system, and completing valve position confirmation by feeding back the signal through the position sensor; The flow stabilizing unit is used for adjusting the rotating speed of the discharge valve through the frequency converter and dynamically adjusting the frequency according to the flow demand of the system.
9. The grain drying system capable of switching between continuous and circulating modes according to claim 1, wherein said safety protection module comprises an abnormality diagnosis unit and a backup control unit; The abnormality diagnosis unit is used for analyzing the rationality of the sensor data in real time, judging the type of system fault when the data exceeds a threshold range, and preferentially adopting soft recovery measures combining parameter adjustment and standby sensor switching; The backup control unit is used for automatically starting the redundant module when the main control system fails so as to maintain the system operation and remotely reporting the state to the monitoring center through the wireless communication interface.
10. The grain drying system capable of switching between continuous and circulating modes according to claim 9, wherein the abnormality diagnosis unit of the safety protection module is configured to monitor data flows of the grain temperature sensor, the moisture detector and the valve position sensor in real time, and determine that the sensor has failed to drift and automatically switch to the standby sensor when data deviations in three consecutive sampling periods exceed a preset threshold; When the standby sensor is not available, a linear interpolation algorithm is adopted to conduct data compensation according to historical data trend, and meanwhile, a medium-level alarm is triggered until the operator intervenes.

Description

Grain drying system capable of switching continuous and circulating modes Technical Field The invention relates to the technical field of grain drying, in particular to a grain drying system capable of switching continuous and circulating modes. Background With the development of economy and social progress of China, the importance of China on grains is gradually increased, and especially on strategic grain reserves. The drying is a necessary processing link after grain production, when grains such as rice, wheat, corn and the like are not timely dried, the grains are easy to mildew, and the grain drying equipment is an agricultural machine for reducing the water content of the grains and building a multipurpose drying room, and the main types comprise cross flow, mixed flow, forward flow, countercurrent, combined type and the like. At present, the traditional grain drying system has various technical limitations in the operation process, and the existing system cannot dynamically match the optimal drying mode according to grain characteristics because of various grain crops and large initial moisture content difference, and when high-moisture grains are directly dried in a circulating mode, the admission amount is limited due to overlong single drying time. The continuous mode adopted by low-moisture grains can reduce the quality of the grains due to excessive drying, and the drying adaptability and quality stability of different grain types cannot be ensured. Therefore, a grain drying system capable of switching between continuous and circulating modes is now proposed to solve the above problems. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a grain drying system capable of switching between continuous and circulating modes, which solves the problems that the optimal drying mode cannot be dynamically matched according to grain characteristics and the drying adaptability and quality stability of different grain types cannot be ensured in the prior art. In order to achieve the above purpose, the invention provides a grain drying system capable of switching between continuous and circulating modes, comprising: The mode control module is used for switching the working mode of the system by controlling the combination of the feeding gate valve and the three-way valve, and comprises a continuous working mode and a circulating working mode, wherein the continuous working mode is used for configuring a plurality of dryers to operate in series, grains are sequentially dried in a relay mode through the dryers, each dryer is independently operated in the circulating working mode, and the grains are dried in a circulating mode in a single dryer until the moisture is safely stored; The continuous working processing module is used for coordinating linkage operation of the feeding system, the dryer group and the discharging system in a continuous working mode, feeding the dryer group through the scraper conveyor, monitoring the material level height through the high material level sensor, adjusting the discharging speed through the variable-frequency discharging valve to control the drying time length, gradually reducing the grain moisture, and finally cooling through the ventilation bin; The circulating work processing module is used for independently controlling the feeding and discharging processes of each dryer under a circulating work mode, and circulating grains in the dryer through the combination of the three-way valves until the sampling detection moisture reaches a preset target value and then is discharged, so that closed-loop drying of a single device is realized; the detection and sensing module is used for collecting the moisture content, the material level height, the grain temperature and the environmental parameters of the grain in real time, and comprises a high material level sensor, a moisture detector and a grain temperature sensor, wherein detection data are used for controlling the drying process in a feedback manner; The intelligent regulation and control module is used for calculating the precipitation amount and the hot air temperature required by drying based on the data of the detection and sensing module, and dynamically adjusting the heat supply parameters of the hot air heater by adopting a PID algorithm so as to respond to the grain temperature change; The valve execution module is used for operating the on-off and the adjustment of the feeding gate valve, the three-way valve and the variable-frequency discharge valve, realizing the control of material flow according to the instruction of the mode control module, and maintaining stable flow without interruption; And the safety protection module is used for automatically triggering an emergency stop mechanism when abnormal conditions such as overhigh temperature, water detection failure, valve blockage and motor overload are detected, reminding operators to intervene through the audible and visual a