CN105300092A - Continuous grain drying water online measuring and controlling method and system based on mass flow method - Google Patents

Abstract

The invention discloses a continuous grain drying water online measuring and controlling method and system based on a mass flow method. The weight of a dryer is measured through a weighing sensor, and a grain weight change value inside the dryer is utilized for calculating the real-time water content of dried grain. The invention further provides a grain drying water time regulating and controlling method based on the mass flow method. The drying time of the dryer is regulated and controlled in real time, and the actual dried grain water content and the target water content are controlled to be within the error range through a plurality of steps of small-amplitude adjustment. The method and system have the beneficial effect that the water content of the dried grain can be accurately calculated, the grain drying process can be precisely controlled, the dried grain water content and the target water content are controlled to be within the error range, and meanwhile excessive adjustment caused by excessively-large amplitude of one-time adjustment is avoided.

Description

On-line measurement and control method and system for continuous grain drying moisture based on mass flow method

technical field

The invention relates to an online moisture measurement and control method for a grain dryer, in particular to an on-line moisture measurement and control method based on a mass flow method suitable for a continuous grain dryer and a time control method for grain drying moisture based on a mass flow method.

Background technique

The basic goal of grain drying is to remove the moisture in the grain with the lowest drying cost and energy consumption under the premise of keeping the drying process stable. Therefore, the online measurement and control of moisture in the grain drying process is very important to the grain drying work.

The traditional on-line measurement and control of grain drying moisture is based on the capacitance method or resistance method on-line measurement and control of moisture, using switch control, classic PID control or modern intelligent predictive control methods. However, the detection is affected by temperature and humidity, the stability is poor, and the control accuracy is not high. In recent years, there have been new research and new products in China that use the gross weight method for online moisture detection and control.

The patent No. CN103808591A of "On-line Moisture Detection Method in Continuous Grain Drying Process" was previously applied. This patent relates to an online moisture detection method based on total weight detection for continuous grain dryers. Calculating moisture, this method is based on the weight detection method and has the advantages of high precision and good stability. However, this method can only calculate the average moisture content of the grain in the dryer during the drying process, but cannot directly obtain the outlet moisture. The outlet moisture needs to be calculated with a drying model, resulting in certain errors. Moreover, this method measures the real-time material level change of the grain inside the dryer by using a laser or a resistance-rotating material level sensor, and calculates the corresponding volume. Due to factors such as the uncertain shape of the grain material pile, the volume calculation is inaccurate, which will also lead to moisture calculation. There is a deviation.

Contents of the invention

An object of the present invention is to provide a method for calculating the real-time moisture content of dried grains.

Another object of the present invention is to provide a method that can adjust the drying time of the dryer. The drying time is adjusted through small steps and slow adjustments, that is, through small adjustments in several steps, the actual grain moisture and the target moisture after drying are controlled within the error range. , to avoid excessive adjustment caused by a single adjustment range is too large.

Another object of the present invention is to provide a continuous grain drying automatic operation system, which adopts the drying operation mode of intermittent grain feeding and grain discharging.

In order to realize these objects and other advantages according to the present invention, a kind of continuous grain drying moisture online measurement and control method based on mass flow method is provided, comprising the following steps:

Step 1: start the dryer to start drying, complete a drying cycle Δζ _i after the grain intake time and grain intake stabilization time Δζ _1i , idle time Δζ _ai , grain discharge time and grain discharge stabilization time Δζ _2i , and calculate the i-th cycle Feed grain quality W _1i :

W _1i ＝WH _i -WL _i-1 +((WH _i -WM _i )/Δξ _ai )·Δξ _1i

Among them, WH _i is the high material level quality of the dryer after the i-th grain feeding and grain feeding stabilization time; WL _i-1 is the low material level quality of the dryer after the i-1 grain discharge and grain discharge stabilization time; WM _i is the quality of the dryer after the i-th idle time; Δζ _1i is the i-th feeding time and feeding stability time; Δζ _ai is the i-th idle time; i represents the drying cycle;

Step 2, calculate the grain discharge quality W _2i of the i-th cycle:

W _2i ＝WH _i -WL _i -((WH _i -WM _i )/Δξ _ai )·(Δξ _2i +Δξ _ai )

Among them, WL _i is the low material level quality of the dryer after the i-th grain discharge and the stable time of grain discharge; Δζ _2i is the i-th grain discharge time and the stable time of grain discharge;

Step 3, calculate the grain moisture M _2i of the i-th discharge of the dryer:

${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}$

Among them, M _1i is the grain moisture entering the dryer for the ith time.

Preferably, wherein, the dryer stops grain feeding after grain feeding and stabilization time Δζ _1i , starts grain discharging after idle time _Δζai , stops grain discharging after grain discharging and grain discharging stabilization time Δζ _2i , and feeds grain Alternate with grain discharge intermittently, and continuous drying operation is being carried out in the drying cycle _Δζi .

Preferably, wherein, the calculation formula of the drying cycle _Δζi is:

Δζ _i = Δζ _1i + Δζ _2i + Δζ _ai

Among them, Δζ _i is the i-th drying cycle of the dryer.

Preferably, wherein, the drying machine adopts the operation method of double-limit material level intermittent grain discharge, when the grain in the dry grain bin reaches the position of the upper limit material level sensor, the grain discharge conveyor is automatically started to start grain discharge; when the grain in the dry grain bin When the grain is lower than the position of the lower limit material level sensor, the grain discharge conveyor is automatically stopped and the grain discharge is stopped.

Object of the present invention can also be realized by a kind of time control method of grain drying moisture based on mass flow method, comprising the following steps:

Step 1, calculate the rolling cumulative average MB _2i of grain discharge moisture in the m drying cycles in the previous i drying cycles;

${\mathrm{<span\; class="notranslate">\; MB</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span>$

Among them, m is the number of rolling accumulation; WB _1i is the rolling accumulation of grain intake quality in m drying cycles in the previous i drying cycles; WB _2i is the rolling accumulation of grain discharge quality in m drying cycles in the previous i drying cycles;

Step 2, when |MB _2i -M _T |>δ, calculate the maximum adjustment time Δ _large of the next cycle i+1 cycle:

${\mathrm{<span\; class="notranslate">\; \&Delta;</span>}}_{\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; arg</span>}\mathrm{<span\; class="notranslate">\; e</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; WBYT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; WBT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;B</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}}$

Among them, WBT _i is the rolling accumulation of the actual dehydration quality of m drying cycles in the previous i cycle; ΔζB _i is the rolling accumulation of drying time of m drying cycles in the previous i drying cycle; WBYT _i+1 is the rolling accumulation of the previous i+1 times The target dehydration quality of m drying cycles in the drying cycle is rolled and accumulated; M _T is the target moisture value; δ is the moisture deviation;

Step 3: Adjust the maximum adjustment time Δ _large in small steps and slowly:

${\mathrm{<span\; class="notranslate">\; \&Delta;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}}_{\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; arg</span>}\mathrm{<span\; class="notranslate">\; e</span>}}}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; WYBT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; WBT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;B</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; \&times;</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; l</span>}}$

Among them, _Δsmall is the single minimum adjustment time; l is the number of small steps and slow adjustments;

Step 4, calculate the cycle time Δζ _i+1 of the i+1th cycle:

When MB _2i -M _T > δ, then increase the idle time of the dryer, Δζ _a(i+1) = Δζ _ai + Δ _small ;

When MB _2i -M _T = δ, the idle time of the dryer remains unchanged, Δζ _a(i+1) = Δζ _ai ;

When MB _2i -M _T <-δ, then reduce the idle time of the dryer, Δζ _a(i+1) = Δζ _ai - Δ _small ;

Step 5: Calculate the rolling cumulative average MB _2(i+1) of grain moisture in m drying cycles in the previous i+1 drying cycles, as long as |MB _2(i+1) -M _T |>δ, repeat step 1 to Step 4, until |MB _2(i+1) -M _T |≤δ, stop the adjustment.

Preferably, wherein, the calculation formula of ΔζB _i in the step 3 is:

${\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;B</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; )</span>$

Among them, ΔζB _i is the time rolling accumulation of m drying cycles in i drying cycles.

Preferably, wherein, the dehydration quality rolling accumulation WBT _i calculation formula of the m drying cycles in the previous i cycle in the step 3 is:

${\mathrm{<span\; class="notranslate">\; WBT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; )</span>$

In the formula, W _1j is the quality of grain entering j times; W _2j is the quality of grain exiting j times.

Preferably, wherein, the rolling accumulation _WYBTi calculation method of the dehydration quality in said step 3 is as follows:

${\mathrm{<span\; class="notranslate">\; WBYT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}}}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; 1</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>$

Among them, WB _1i is the rolling accumulation of grain intake quality in m drying cycles in the previous i drying cycles.

The purpose of the present invention can also be achieved by a continuous grain drying automatic operation system, including: the wet grain storage bin in front of the tower, the insert plate installed at the bottom is used to control the intermittent entry of grain into the main body of the dryer, the wet grain in front of the tower The grain storage bin is located on one side of the main body of the dryer;

The dry grain temporary storage bin behind the tower is used to store dried grain, and the dry grain temporary storage bin behind the tower is located on the other side of the main body of the dryer;

The main body of the dryer, which is divided into a grain storage section, a drying section, a cooling section and a grain discharge mechanism from top to bottom, is used for drying grain;

The weighing sensor is used to weigh the quality change of the grain in the dryer main body, and the weighing sensor is installed at the bottom of the dryer main body.

Preferably, it adopts the drying operation mode of intermittent grain feeding and grain discharge, by controlling the inserting plate, the grain is controlled to intermittently enter the main body of the dryer for drying, and by controlling the operation of the grain discharge mechanism, the grain is controlled to be discharged from the main body of the dryer intermittently to finish drying.

The present invention at least includes the following beneficial effects: 1. The weight of the dryer is monitored in real time by a weighing sensor, and the moisture content of the dried grains can be obtained directly, thereby adjusting the drying time to control the moisture content of the dried grains and the target moisture within the error range, precisely controlled Grain drying moisture. 2. The accuracy of the whole range of moisture detection is better than ±0.5%, and the implementation of target control, speed limit control and constant speed control on the drying process not only improves the degree of automation of the dryer, but also realizes energy-saving drying and quality-guaranteed drying.

Other advantages, objectives and features of the present invention will partly be embodied through the following descriptions, and partly will be understood by those skilled in the art through the study and practice of the present invention.

Description of drawings

Fig. 1 is the operation flowchart of the drying system of the present invention.

Fig. 2 is a schematic diagram of the upper structure of the drying system of the present invention.

Fig. 3 is a schematic diagram of the lower structure of the drying system of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

It should be understood that terms such as "having", "comprising" and "including" used herein do not denote the presence or addition of one or more other elements or combinations thereof.

Step 1. Operation initialization: input and store the initial average moisture value M ₀ of the grain to be dried, the target moisture value M _T , the temperature and humidity of the heat medium T, and the grain discharge frequency G _g in the control display unit of the dryer;

Step 2. Check the tare weight: install a weighing sensor group at the lower part of the dryer, and the weighing sensor detects the weight of the dryer. The weight of the dryer includes the weight of the main body of the dryer and the weight of the grain in it; when there is no grain inside the dryer, The electrical signal is detected by the load cell group, the load cell group is connected to the signal detection and conversion unit, the signal detection and conversion unit converts the electrical signal into a weight signal, the signal detection and conversion unit is connected to the control display unit, and the control display unit detects, Read and store tare weight W _b ;

Step 3, the first grain feeding operation: start the grain feeding operation with double-limit material level control, manually or automatically start the dryer to feed grain, and transport the high-moisture grains to be dried into the dryer, when the grains in the dryer reach the position of the feeding level sensor , automatically stop feeding; when the grain in the dryer is lower than the position of the lower material level sensor, start the feeding device again;

Step 4. Start the continuous drying operation: Start the induced draft fan, heating device and grain discharge device according to a certain time interval and sequence, and the drying machine passes grain feeding time and grain feeding stability time Δζ _1i , idle time Δζ _ai , grain discharging time and grain discharging One drying cycle Δζ _i is completed after a stabilization time Δζ _2i .

Δζ _i = Δζ _1i + Δζ _2i + Δζ _ai (1)

Step 5. Monitor the continuous drying process, and calculate the rolling cumulative MB _2i of the grain moisture discharged by the dryer:

①In the i-th drying cycle, the control and display unit detects, reads and stores the high level quality WH _i after a single grain intake and the stabilization time, the mass WM _i after the idle time, the single grain discharge and the stabilization time after Low material level quality WL _i , average grain moisture M _1i , so as to calculate single grain intake quality W _1i , incoming dry matter mass WG _1i , incoming water quality WS _1i , single discharge grain quality W _2i , and discharge water quality WS _2i , dehydrated weight WT _i and single grain discharge moisture M _2i , namely the formulas (2)-(8).

W _1i =WH _i -WL _i-1 +((WH _i -WM _i )/Δξ _ai )·Δξ _1i (2)

W _2i ＝WH _i -WL _i -((WH _i -WM _i )/Δξ _ai )·(Δξ _2i +Δξ _ai )(3)

WG _1i ＝W _1i ·(1-M _1i )(4)

WS _1i =W _1i ·M _1i (5)

WS _2i =W _2i -WG _1i (6)

WT _i =WS _1i -WS _2i (7)

${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; WG</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}{{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; )</span>$

Among them, WH _i is the mass of the dryer at the high level after the i-th grain feeding and grain-feeding stabilization time measured by the load cell, kg; WM _i is the mass of the dryer after the i-th idle time measured by the load cell, kg ; WL _i is the weight sensor measured by the load cell for the ith grain intake of the dryer and the single grain discharge after the grain intake stabilization time and the low material level quality after the stabilization time, kg; M _1i is the moisture value of the ih grain entry; W _1i is the weight of grain fed to the dryer for the _i -th time, kg; WG _1i is the weight of dry matter entering the dryer for the i-th time, kg; WS _1i is the quality of water entering the dryer for the i-th time, kg; WS _2i is the water quality of the i-th discharge, kg; WT _i is the dehydration mass of the i-th time, kg; M _2i is the water content of the _i -th single discharge, kg; The i-time idle time, s; Δζ _1i is the i-th grain feeding time and the grain-feeding stable time, s; Δζ _2i is the i-th grain discharge time and the grain discharge stable time, s; i is the number of drying cycles, i=1 ,2,3LLn.

At this time, the concept is introduced: rolling accumulation, that is, in the previous i drying cycles, the corresponding data of m drying cycles are summed. Rolling cumulative average, that is, the corresponding data of m drying cycles in the previous i drying cycles are rolled and accumulated and divided by m.

The rolling accumulation of the incoming grain quality, incoming dry matter quality, incoming water quality, discharged grain quality, outgoing water quality, dehydration quality and drying cycle is calculated to obtain the rolling cumulative WB _1i of incoming grain quality and the rolling cumulative average WBG of incoming dry matter quality _1i , rolling accumulation of incoming water quality WBS _1i , rolling accumulation of grain discharge quality WB _2i , rolling accumulation of discharged water quality WBS _2i , rolling accumulation of dehydration quality WBT _i and rolling accumulation of drying cycle ΔζB _i , namely formulas (9)-(15).

${\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 9</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 10</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; WBG</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 11</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; WBS</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 12</span>}<span\; class="notranslate">\; )</span>$

WBS _2i = WB _2i -WBG _1i (13)

WBT _i = WBS _1i -WBS _2i (14)

${\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;B</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 15</span>}<span\; class="notranslate">\; )</span>$

According to the formulas (8)-(14), calculate the rolling cumulative average MB _2i of grain moisture:

${\mathrm{<span\; class="notranslate">\; MB</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}{{\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 16</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; MB</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; WH</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; WL</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; WH</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; W\; M</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;\&xi;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; \&Delta;\&xi;</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; )</span>}{\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; WH</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; WL</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; WH</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; W\; M</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;\&xi;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&Delta;\&xi;</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; \&Delta;\&xi;</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

Among them, WB _1i is the rolling accumulation of the incoming grain mass of the m drying cycles in the previous i drying cycles, kg; WBG _1i is the rolling cumulative average of the incoming dry matter mass of the m drying cycles in the previous i drying cycles, kg; WBS _1i is the rolling accumulation of incoming water quality in the m drying cycles in the previous i drying cycles, kg; WB _2i is the rolling accumulation of the grain discharge quality in the m drying cycles in the previous i drying cycles, kg; WBS _2i is the rolling accumulation in the previous i drying cycles The rolling accumulation of the discharged water quality in the m drying cycles, kg; WBT _i is the rolling accumulation of the dehydration mass of the m drying cycles in the previous _i drying cycles, kg; The average value of grain moisture rolling accumulation; ΔζB _i is the rolling accumulation of m drying cycle time in the previous i drying cycle, s; m is the rolling accumulation number, m=1,2,3LLn; a=i-m+1, positive integer.

Step 6. Control the continuous drying process: By calculating the comparison between the rolling accumulation MB _2i of the grain moisture and the target moisture MT, control the idle time _{Δζ ai} , that is, the residence time of the grain in the dryer, that is, the drying speed of the grain, so that The moisture of the grain is maintained within a reasonable range of the set moisture value. High outlet moisture increases the idle time, that is, increases the single-cycle operation time of the grain in the dryer; low outlet moisture reduces the idle time, that is, reduces the single-cycle operation time of the grain in the dryer.

When MB _2i -M _T >δ, then increase the time of the grain in the dryer, Δζ _a(i+1) = Δζ _ai + Δ;

When MB _2i -M _T = δ, the time of the grain in the dryer remains unchanged, Δζ _a(i+1) = Δζ _ai ;

When MB _2i -M _T <-δ, then reduce the time of the grain in the dryer, Δζ _a(i+1) = Δζ _ai -Δ;

Among them, δ is the rolling accumulated moisture deviation of grain discharge; Δζ _a(i+1) is the i+1 idle time, s; Δ is the single adjustment time, s;

The following steps are calculated by taking MB _2i -M _T >δ as an example.

Assuming that the grain intake time and grain intake stability time Δζ _1i and the grain discharge time and grain discharge stability time remain unchanged, the time of the i+1th cycle is calculated according to formula (18):

Δζ _i+1 = Δζ _1i + Δζ _ai + Δζ _2i + Δ = Δζ _i + Δ (18)

Step 7. Equal weight time adjustment:

①According to the average grain moisture M _1i of the grain to be dried, the target moisture value M _T , the single grain weight W _1i and the rolling accumulation of the grain weight WB _1i , calculate the single dehydration weight WYT _i and the weight that should be dehydrated The rolling accumulation of WBYT _i , namely formula (19)-(21);

${\mathrm{<span\; class="notranslate">\; WYT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; WG</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 19</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; WBYT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; WBG</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 20</span>}<span\; class="notranslate">\; )</span>$

${\mathrm{<span\; class="notranslate">\; WBYT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; WB</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}}}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; twenty\; one</span>}<span\; class="notranslate">\; )</span>$

Among them, WYT _i is the mass to be dehydrated in order to reach the target moisture value MT in a single drying cycle, kg; _{WBYT i} is the rolling accumulation of the mass to be dehydrated in m drying cycles in the previous i drying cycles, kg;

②Assuming that the drying environment and process conditions remain unchanged, and the unit energy consumption for removing high and low moisture is the same, the rolling accumulation of the actual dehydration quality WBT _i and the corresponding cycle operation time rolling accumulation ΔζB _i is derived to deduce the rolling accumulation of the dehydration quality WBYT _i in the next cycle The corresponding cycle operation time rolling accumulation ΔζB _i+1 is the formula (22).

WBT _i :ΔζB _i ＝WBYT _i+1 :ΔζB _i+1 ＝WBYT _i+1 :(ΔζB _i +m×Δ _large )(22)

Among them, ΔζB _i is the cumulative time of m drying cycles in the first i drying cycles, s; ΔζB _i+1 is the cumulative time of m drying cycles in the first i+1 drying cycles, s; Δ _large is the single maximum Adjustment time, s.

According to formulas (15), (18) and (22), the single adjustment time Δ _large is calculated:

${\mathrm{<span\; class="notranslate">\; \&Delta;</span>}}_{\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; arg</span>}\mathrm{<span\; class="notranslate">\; e</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; WYBT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; WBT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;B</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; twenty\; three</span>}<span\; class="notranslate">\; )</span>$

Step 8: Adjust the time of the next operation cycle by adopting the method of "slow adjustment in small steps", and stop the adjustment when |MB _2(i+1) -M _T |≤δ. "Small steps and slow adjustment" means that the time required for one adjustment is divided into several steps of adjustment on average, so as to avoid excessive adjustment caused by a single adjustment range that is too large.

Δ _large = Δ _small ×l(24)

Among them, _Δsmall is the minimum single adjustment time, s; l is the number of steps for one adjustment, an integer.

Calculate Δ _small according to formulas (9)-(14), (21)-(24):

${\mathrm{<span\; class="notranslate">\; \&Delta;</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; l</span>}\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; WBYT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; WBT</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&times;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;\&zeta;B</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 25</span>}<span\; class="notranslate">\; )</span>$

②The operating time of the next cycle Δζ _i+1 is:

Δζ _i+1 = Δζ _i + Δ _small (26)

Step Nine:

Calculate the rolling cumulative average MB _2(i+1) of moisture in m drying cycles in the previous i+1 drying cycles, as long as |MB _2(i+1) -M _T |>δ, repeat steps 1 to 4, Stop adjusting until |MB _2(i+1) -M _T |≤δ.

As shown in Figures 1, 2 and 3, an example of a continuous grain drying online measurement and control system based on mass flow method. The system mainly includes a wet grain feeding device in front of the tower, a drying device, a dry grain temporary storage device behind the tower, a sensor group and a control unit.

The wet grain feeding device in front of the tower includes: the conveyor 111 before the initial cleaning screen, the initial cleaning screen 112, the bottom conveyor 113 of the wet grain storage silo, the lower plate of the wet grain storage silo 114, the grain feeding hopper 115, and the hoist in front of the wet grain silo 116, the wet grain storage granary 117 in front of the tower, the grain feeding pipe 118 for the wet granary, and the grain hoist 119 for advancing the tower.

The drying device includes: a grain feeding pipe 121 of the dryer, a grain storage section 122, a drying section 123, a hot air channel 124, a cooling section 125, a grain discharge mechanism 126, a tower bottom conveyor 127, a hot air blower 128, and a dryer main body 129.

The dry grain temporary storage device behind the tower includes: the grain discharge hoist 131 behind the tower, the grain feeding pipe 132 for the dry grain bin, the dry grain bin 133 behind the tower, the bottom conveyor 134 for the dry grain bin; the dry grain shed 135 and the grain discharge conveyor 136 behind the dry grain bin .

The control unit includes: a control and display unit 141 , and a signal detection and conversion unit 142 .

The sensor group includes: a load cell group 151 for the total weight of the dryer (including grain), a material level sensor 152 and a temperature detection head group.

Dryer main body 129 is sequentially composed of grain storage section 122 , drying section 123 , cooling section 125 , and grain discharge mechanism 126 from top to bottom. The effect of the grain storage section 122 is to temporarily store the grain entering the dryer, waiting to enter the drying section 123 for drying. As a preference, the material level sensor group 152 of the main body of the dryer is installed on the grain storage section 122 . As a preference, in order to increase the drying capacity and drying rate of the dryer, there are multiple drying sections 123 inside the dryer. After the grain is dried in multiple stages, it enters the cooling section 125 for cooling. Mechanism 126, conveyor 127 at the bottom of the tower, conveyor 131 at the bottom of the tower and the dry grain bin 132 enter the dry grain bin 133 after entering the tower. As a preference, the dry grain bin material level sensor group 152 behind the tower is installed on the upper part of the dry grain bin 133 behind the tower, and the material level sensor group 152 includes an upper material level sensor and a lower material level sensor.

The load cell group 151 of the total weight of the dryer (including grain) includes several load cells, which are installed at the bottom of the column of the dryer base or on the column. The installation method of the load cell can be determined according to the type of the sensor. As a further preference, the load cell group 151 is composed of four or more load cells with the same principle, structure, size, material, range and precision. When the weight of the grain in the main body 129 of the dryer changes, the column of the base of the dryer is deformed under pressure, and the load cell 151 is also deformed at this time, and the resistance of the strain gauge changes, which is converted into a voltage signal through the bridge circuit, and the voltage signal is transmitted to Signal conversion and detection unit 142 .

The signal detection and conversion unit 142 collects and converts the voltage signal. The unit is composed of an amplification filter circuit, an analog-to-digital conversion circuit, a watchdog circuit, an MCU signal processor, and an RS485 serial communication circuit.

Prepend the amplified filter line to remove noise and amplify the signal. It is then connected with the analog-to-digital conversion circuit, which is responsible for converting the analog signal into a digital signal that can be received by the host computer. Then the MCU signal processing circuit is connected with the analog-to-digital conversion circuit, which is responsible for processing the received digital signal. The watchdog circuit is connected with the MCU circuit to prevent the locking and loss of the program. Finally, the processed signal is connected to the control display unit 141 through the RS485 serial communication line.

The temperature detection head group transmits the ambient temperature and the temperature signal in the dryer main body 129 to the MCU signal processing circuit. The material level sensor group 152 is connected with the signal detection and conversion unit 142 to judge the height of the grain in the dryer main body 129 and the dry grain bin 133 behind the tower. As a preference, the material level sensor group 152 can use an infrared laser material level sensor or a rotary resistance type material level switch.

When the MCU system is running, in order to prevent some phenomena such as program loss, storage failure, external interference or incorrect operation, which will cause the system to enter an endless loop and fail to work normally, it is necessary to add a watchdog circuit. The basic function is to initialize the program after a problem occurs in the software operation and the program is disordered. In this way, when the system encounters such disturbances, it can be reset immediately, which greatly improves the working stability of the machine itself. At this time, the digitized, stable, and calculated signals are transmitted to the control and display unit 141 .

During the drying operation, the grains to be dried must first be cleared and removed through the initial cleaning sieve 112 . The grain after cleaning and removing impurities enters the front wet grain storage granary 117 of the tower for temporary storage through the hoist 116 before the wet granary, the grain slipping pipe 118 of the wet granary. By controlling the flashboard 114 under the silo body, the grain can be intermittently discharged from the wet grain storage bin 117 in front of the tower, and enter the grain hoist 119 into the tower through the bottom conveyor 113 and the grain feeding hopper 115 at the bottom of the wet grain bin. The tower advance grain hoist 119 conveys the grain from bottom to top to the upper top of the dryer main body 129, and the grain feed chute 121 between the tower advance hoist 119 and the dryer main body 129 spreads the grain evenly into the dryer main body 129 Inside, the grain passes through the grain storage section 122, the drying section 123, and the cooling section 125 downwards by gravity, and on the side of the air duct where the main body of the dryer 129 is installed, the heat medium is blown into the dryer by blasting to dry the grain. Enter the six-blade grain discharge mechanism 126 after the first-stage drying, by controlling the grain discharge mechanism 126, the grain can be intermittently discharged from the grain discharge mechanism and control the grain discharge speed. After the grain is discharged by the grain discharge mechanism 126, it is sent to the tower bottom conveyor 131 by the tower bottom conveyor 127. Through the tower bottom conveyor 131, the grain is transported from bottom to top to the upper top of the dry grain bin 133 behind the tower, and the grain is sprinkled into the tower through the dry grain bin feeding pipe 132 between the tower bottom conveyor 131 and the dry grain bin 133 behind the tower. In the rear dry grain storehouse, complete the whole drying process, and wait to enter the dry grain shed 135 for storage.

As a further preference, during the drying operation, the grain feeding process and the grain discharging process are carried out intermittently, that is, no grain is discharged during the grain feeding process, and no grain is fed during the grain discharging process, so that the weight of a single grain feeding and grain discharging process can be accurately calculated. As a further preference, there will be a short stable residence time after a single grain intake and grain discharge process, that is, neither grain intake nor grain discharge time, so that vibration and single grain intake or grain discharge can be avoided. The influence of the detection accuracy of the machine gross weight sensor group 121.

As a further preference, the dry grain bin 133 behind the tower adopts double limit material level control, that is, when the grain height in the dry grain bin 133 behind the tower is higher than the high material level sensor 152, the grain is discharged from the dry grain bin 133 behind the tower, and passes through the bottom of the dry grain bin. Conveyor 134 is sent in the grain storage bin or the grain transportation vehicle; When the grain height in the dry grain bin 133 behind the tower was lower than the low material level sensor 152, the dry grain bin 133 stopped discharging grain behind the tower.

To sum up, the measurement and control method of continuous grain moisture detection based on the mass flow method has been realized through the manipulation of the measurement and control system based on the total weight and moisture detection of grains.

The present invention at least includes the following beneficial effects: 1. The weight of the dryer is monitored in real time by a weighing sensor, and the moisture content of the dried grains can be obtained directly, thereby adjusting the drying time to control the moisture content of the dried grains and the target moisture within the error range, precisely controlled Grain drying moisture. 2. The accuracy of the whole range of moisture detection is better than ±0.5%, and the implementation of target control, speed limit control and constant speed control on the drying process not only improves the degree of automation of the dryer, but also realizes energy-saving drying and quality-guaranteed drying.

Although embodiments of the present invention have been disclosed above, it is not limited to the applications set forth in the specification and examples. It can be fully applied to various fields suitable for the present invention. Additional modifications can readily be made by those skilled in the art. Therefore, the invention should not be limited to the specific details and examples shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims (10)

1., based on a continous way grain dry moisture on-line measuring method for matter stream method, it is characterized in that, comprise the following steps:

Step one, starts drying machine and starts drying, through entering the grain time and entering grain Δ stabilization time ζ _1i, free time Δ ζ _ai, row's grain time and row's grain Δ stabilization time ζ _2iafter complete one arid cycle Δ ζ _i, what calculate i-th cycle enters grain quality W _1i:

W _1i＝WH _i-WL _i-1+((WH _i-WM _i)/Δξ _ai)·Δξ _1i

Wherein, WH _iit is the high charge level quality of drying machine after entering grain i-th time and entering grain stabilization time; WL _i-1be the i-th-1 time row's grain and the low material level quality of drying machine after row grain stabilization time; WM _iit is drying machine quality after i-th free time; Δ ζ _1ibe enter the grain time for i-th time and enter grain stabilization time; Δ ζ _aiit is i-th free time; I represents arid cycle;

Step 2, calculates row's grain quality W in i-th cycle _2i:

W _2i＝WH _i-WL _i-((WH _i-WM _i)/Δξ _ai)·(Δξ _2i+Δξ _ai)

Wherein, WL _ibe i-th row's grain and the low material level quality of drying machine after row grain stabilization time; Δ ζ _2iit is i-th row's grain time and row grain stabilization time;

Step 3, calculates drying machine i-th row's grain moisture M _2i:

$M_{2i}=1-\frac{W_{1i}(1-M_{1i})}{W_{2i}}$

Wherein, M _1iit is the grain moisture content entering drying machine i-th time.

2., as claimed in claim 1 based on the continous way grain dry moisture on-line measuring method of matter stream method, it is characterized in that, described drying machine through entering grain and stabilization time Δ ζ _1iafter stop into grain, through free time Δ ζ _aiafter start to arrange grain, through row's grain and row's grain Δ stabilization time ζ _2irear stopping row grain, enters grain and hockets with row's grain interval, and at Δ ζ arid cycle _iinside all carrying out continuous drying operation.

3., as claimed in claim 1 or 2 based on the continous way grain dry moisture on-line investigating method of matter stream method, it is characterized in that, described arid cycle Δ ζ _icomputing formula be:

Δζ _i＝Δζ _1i+Δζ _2i+Δζ _ai

Wherein, Δ ζ _ifor i-th arid cycle of drying machine.

4. as claimed in claim 1 based on the continous way grain dry moisture on-line measuring method of matter stream method, it is characterized in that, described drying machine adopts the operating type of two limit material level interval row grain, when grain in solid food storehouse reaches upper limit level sensor position, automatic startup row grain conveyer, starts to arrange grain; When grain in solid food storehouse is lower than lower limit level sensor position, automatically stop row's grain conveyer, stop row's grain.

5. based on a time-controllable method for the grain dry moisture of matter stream method, it is characterized in that, use the moisture on-line measuring method described in claim 1-4, comprise the following steps:

Step one, before calculating, in i arid cycle, m arid cycle arranges grain moisture rolling cumulative mean MB _2i;

${\mathrm{MB}}_{2i}=\underset{j=i-m+1}{\overset{i}{\&Sigma;}}(M_{2j}/m)$

Wherein, m is rolling accumulative frequency; M _2jfor drying machine jth time row's grain moisture;

Step 2, when | MB _2i-M _t| during > δ, calculate the maximal adjustment time Δ in next cycle and i+1 cycle _large:

${\mathrm{\&Delta;}}_{l\arg e}=(\frac{{\mathrm{WBYT}}_{i+1}}{{\mathrm{WBT}}_i}-1)\&times;\frac{{\mathrm{\&Delta;\&zeta;B}}_i}{m}$

Wherein, WBT _ifor in front i cycle period, m actual dehydration arid cycle quality is rolled cumulative; Δ ζ B _idrying time for m arid cycle in the front i arid cycle rolls cumulative; WBYT _i+1desired dehydration quality for m arid cycle in front i+1 arid cycle is rolled cumulative; M _tfor target water score value; δ is moisture deviation;

Step 3: to maximal adjustment time Δ _largethe mode adopting small step to adjust slowly adjusts:

${\mathrm{\&Delta;}}_{small}=\frac{{\mathrm{\&Delta;}}_{l\arg e}}{l}=(\frac{{\mathrm{WYBT}}_{i+1}}{{\mathrm{WBT}}_i}-1)\&times;\frac{{\mathrm{\&Delta;\&zeta;B}}_i}{m}\&times;\frac{1}{l}$

Wherein, Δ _smallfor the minimum regulation time of single; L is the step number that small step is adjusted slowly;

Step 4, calculates Δ ζ cycle time in the i-th+1 time cycle _i+1:

Work as MB _2i-M _tduring > δ, then increase the free time of drying machine, Δ ζ _{a (i+1)}=Δ ζ _ai+ Δ _small;

Work as MB _2i-M _tduring=δ, then the free time of drying machine is constant, Δ ζ _{a (i+1)}=Δ ζ _ai;

Work as MB _2i-M _tduring <-δ, then reduce the free time of drying machine, Δ ζ _{a (i+1)}=Δ ζ _ai-Δ _small;

Step 5: before calculating, in i+1 arid cycle, m arid cycle arranges grain moisture rolling cumulative mean MB _{2 (i+1)}as long as, | MB _{2 (i+1)}-M _t| > δ, repeat step one to step 4, until | MB _{2 (i+1)}-M _t| during≤δ, stop adjustment.

6., as claimed in claim 5 based on the time-controllable method of the grain dry moisture of matter stream method, it is characterized in that, Δ ζ B in described step 3 _icomputing formula is:

${\mathrm{\&Delta;\&zeta;B}}_i=\underset{j=i-m+1}{\overset{i}{\&Sigma;}}({\mathrm{\&Delta;\&zeta;}}_{1j}+{\mathrm{\&Delta;\&zeta;}}_{2j}+{\mathrm{\&Delta;\&zeta;}}_{aj})$

Wherein, Δ ζ B _itime for m arid cycle in i arid cycle rolls cumulative.

7. as claimed in claim 5 based on the time-controllable method of the grain dry moisture of matter stream method, it is characterized in that, before in described step 3, in i cycle period, the dehydration quality rolling of m arid cycle adds up WBT _icomputing formula is:

${\mathrm{WBT}}_i=\underset{j=i-m+1}{\overset{i}{\&Sigma;}}(W_{1j}-W_{2j})$

In formula, W _1jfor j time enters grain quality; W _2jfor j time is discharged grain quality.

8. as claimed in claim 5 based on the time-controllable method of the grain dry moisture of matter stream method, it is characterized in that, the cumulative WYBT of quality rolling that should dewater in described step 3 _icomputational methods are as follows:

${\mathrm{WBYT}}_i={\mathrm{WB}}_{1i}\&times;(1-\frac{1}{1-M_T}\&times;(1-\underset{j=i-m+1}{\overset{i}{\&Sigma;}}\left(M_{1j}/m\right))$

Wherein, WB _1ifor the grain quality of entering of m arid cycle in the front i arid cycle is rolled cumulative.

9., based on a continous way grain dry automatic operating system for method described in claim 1-8, it is characterized in that, described system comprises:

Wet grain grain storehouse before tower, the plate installed bottom it enters drying machine main body for controlling cereal interval, and before described tower, wet grain grain storehouse is positioned at the side of drying machine main body;

The temporary warehouse of solid food after tower, it is for the grain after storing and drying, and after described tower, the temporary warehouse of solid food is positioned at the opposite side of drying machine main body;

LOAD CELLS, it is for taking the mass change of grain in drying machine main body, and described LOAD CELLS is arranged on the bottom of drying machine main body.

10. a kind of continous way grain dry automatic operating system according to claim 9, is characterized in that, described system adopts interval to enter the drying operation mode of grain and row's grain, and plate control cereal interval enters in drying machine main body carries out drying; By controlling draining crop mechanism running, controlling cereal interval discharge drying machine main body and terminating drying.