CN105300092B - Continuous way corn drying moisture on-line investigating method based on mass flow method and system - Google Patents

Continuous way corn drying moisture on-line investigating method based on mass flow method and system Download PDF

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CN105300092B
CN105300092B CN201510741411.0A CN201510741411A CN105300092B CN 105300092 B CN105300092 B CN 105300092B CN 201510741411 A CN201510741411 A CN 201510741411A CN 105300092 B CN105300092 B CN 105300092B
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grain
time
drying
moisture
drying machine
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CN105300092A (en
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吴文福
刘哲
韩峰
张亚秋
徐岩
吴玉柱
吴新怡
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Jida Science Apparatus Co., Ltd., Changchun
Jilin University
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JIDA SCIENCE APPARATUS CO Ltd CHANGCHUN
Jilin University
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Abstract

The invention discloses a kind of continuous way corn drying moisture on-line investigating method based on mass flow method and system thereof, measure the weight of drying machine with LOAD CELLS, in utilizing drying machine, corn weight changing value calculates corn real-time moisture after drying;Also provide for a kind of time-controllable method of corn drying moisture based on mass flow method, real-time monitoring drying machine drying time, adjusted by a small margin by some steps, control dried actual grain moisture and Target moisture in range of error.The present invention has the advantage of the moisture that can accurately calculate dried corn, the Grain Drying Process also can being precisely controlled, and controls dried grain moisture with Target moisture in range of error, and avoid single to adjust amplitude is excessive causes accommodative excess simultaneously.

Description

Continuous way corn drying moisture on-line investigating method based on mass flow method and system
Technical field
The present invention relates to a kind of crop dryer moisture on-line investigating method, fit particularly to one Moisture on-line investigating method based on mass flow method and a kind of base together in continuous way crop dryer Time-controllable method in the corn drying moisture of mass flow method.
Background technology
The elementary object of grain drying be to maintain dry run stable on the premise of, with minimum dry Dry cost and energy consumption remove the moisture in grain.Therefore, moisture online in Grain Drying Process Observing and controlling is most important to grain drying work.
Traditional grain drying moisture on-line observing and controlling is based on capacitance method or electric-resistivity method moisture on-line On the basis of observing and controlling, on-off control, classical PID is used to control or modern Intelligent predictive control side Method is carried out.But detection is affected by humiture, and poor stability, control accuracy is the highest.In recent years, Domestic occurring in that uses gross weight method to carry out moisture on-line detection and the recent studies on of control and new product.
" a kind of continuous way Grain Drying Process moisture on-line detection method " patent of earlier application Number CN103808591A, this patent relates to examining based on gross weight of a kind of continuous way crop dryer The moisture on-line detection method surveyed, the method utilizes the relation of moisture and unit weight to calculate moisture, should Method has the advantages such as precision height and good stability based on gravimetric analysis sensing method.But the method can only The average moisture of grain in drying machine in calculating dry run, and water outlet can not be immediately arrived at Point, moisture content of outlet needs to calculate with drying model, causes certain error.And the method is led to Cross the Realtime Level using laser or blocking rotary type level sensor to measure dryer inner corn to become Changing, calculate corresponding volume, affected by factors such as corn stockpile shape are uncertain, volume calculates Inaccurate, also result in moisture meter and calculate existing deviation.
Summary of the invention
It is an object of the present invention to provide a kind of real-time moisture calculating corn after drying Method.
A further object of the invention provides the method for a kind of controllable drying machine drying time, logical Cross the method that small step adjusts slowly and adjust drying time, i.e. adjust by a small margin by some steps, control to do After dry, actual grain moisture and Target moisture are in range of error, it is to avoid it is excessive that single adjusts amplitude Cause accommodative excess.
A further object of the invention provides a kind of continuous way corn drying automatic operating system, adopts Grain and the drying operation mode of row's grain is entered by interval.
In order to realize according to object of the present invention and further advantage, it is provided that a kind of based on matter The continuous way corn drying moisture on-line investigating method of stream method, comprises the following steps:
Step one, starts drying machine and starts to be dried, through entering the grain time and entering grain Δ stabilization time ζ1i、 Free time Δ ζai, row the grain time and row grain Δ stabilization time ζ2iAfter complete an arid cycle Δζi, calculate the i-th cycle enters grain quality W1i:
W1i=WHi-WLi-1+((WHi-WMi)/Δξai)·Δξ1i
Wherein, WHiThe high charge level quality of drying machine after entering grain for i & lt and enter grain stabilization time; WLi-1It it is the low material position quality of drying machine after the i-th-1 time row's grain and row grain stabilization time;WMiFor Drying machine quality after i & lt free time;Δζ1iFor i & lt enter the grain time and enter grain stablize time Between;ΔζaiFor i & lt free time;I represents arid cycle;
Step 2, calculates row's grain quality W in i-th cycle2i:
W2i=WHi-WLi-((WHi-WMi)/Δξai)·(Δξ2i+Δξai)
Wherein, WLiFor the low material position of drying machine after i & lt row's grain and row grain stabilization time Quality;Δζ2iFor i & lt row's grain time and row grain stabilization time;
Step 3, calculates drying machine i & lt row grain moisture M2i:
M 2 i = 1 - W 1 i ( 1 - M 1 i ) W 2 i
Wherein, M1iThe grain moisture content of drying machine is entered for i & lt.
Preferably, wherein, described drying machine is through entering grain and Δ ζ stabilization time1iAfter stop into Grain, through free time Δ ζaiAfter start to arrange grain, through row grain and row grain Δ stabilization time ζ2iRear stopping Row's grain, enters grain with row's grain interval alternately, and at Δ ζ arid cycleiThe most all carrying out continuously Drying operation.
Preferably, wherein, Δ ζ described arid cycleiComputing formula be:
Δζi=Δ ζ1i+Δζ2i+Δζai
Wherein, Δ ζiI-th arid cycle for drying machine.
Preferably, wherein, described drying machine uses double limit material interdigit to have a rest and arranges the operating type of grain, When in solid food storehouse, grain reaches upper limit level sensor position, automatically start row's grain conveyer, Start to arrange grain;When in solid food storehouse, grain is less than lower limit level sensor position, the row's of being automatically stopped grain Conveyer, stops row's grain.
The purpose of the present invention is also by the time of a kind of corn drying moisture based on mass flow method Regulation and control method realizes, and comprises the following steps:
Step one, before calculating, m arid cycle arranges the rolling of grain moisture and adds up in i arid cycle Average MB2i
MB 2 i = Σ j = i - m + 1 i ( M 2 j / m )
Wherein, m is for rolling accumulative frequency;WB1iDry for m in front i arid cycle The grain quality of entering in dry cycle rolls cumulative;WB2iFor m arid cycle in front i arid cycle Row's grain quality roll cumulative;
Step 2, when | MB2i-MT| during > δ, calculate next cycle i.e. maximum in i+1 cycle Adjustment time Δlarge:
Δ l arg e = ( WBYT i + 1 WBT i - 1 ) × ΔζB i m
Wherein, WBTiRoll for m actual dehydration arid cycle quality in front i cycle period Cumulative;ΔζBiRoll cumulative for the drying time of m arid cycle in front i arid cycle; WBYTi+1Roll tired for the desired dehydration quality of m arid cycle in front i+1 arid cycle Add;MTFor Target moisture value;δ is moisture deviation;
Step 3: to maximal adjustment time ΔlargeThe mode using small step to adjust slowly is adjusted:
Δ s m a l l = Δ l arg e l = ( WYBT i + 1 WBT i - 1 ) × ΔζB i m × 1 l
Wherein, ΔsmallThe time is adjusted for single minimum;L is the step number that small step is adjusted slowly;
Step 4, calculates Δ ζ cycle time in i+1 time cyclei+1:
Work as MB2i-MTDuring > δ, then increase the free time of drying machine, Δ ζa(i+1)=Δ ζaismall
Work as MB2i-MTDuring=δ, then the free time of drying machine is constant, Δ ζa(i+1)=Δ ζai
Work as MB2i-MTDuring <-δ, then reduce the free time of drying machine, Δζa(i+1)=Δ ζaismall
Step 5: before calculating, m arid cycle arranges the rolling of grain moisture and tire out in i+1 arid cycle Add average MB2(i+1)As long as, | MB2(i+1)-MT| > δ, repeat step one and arrive step 4, until |MB2(i+1)-MT| during≤δ, stop adjusting.
Preferably, wherein, Δ ζ B in described step 3iComputing formula is:
ΔζB i = Σ j = i - m + 1 i ( Δζ 1 j + Δζ 2 j + Δζ a j )
Wherein, Δ ζ BiRoll cumulative for the time of m arid cycle in i arid cycle.
Preferably, wherein, m arid cycle in i cycle period before in described step 3 Dehydration quality roll cumulative WBTiComputing formula is:
WBT i = Σ j = i - m + 1 i ( W 1 j - W 2 j )
In formula, W1jGrain quality is entered for j time;W2jGrain quality is discharged for j time.
Preferably, wherein, the quality that should be dehydrated in described step 3 rolls cumulative WYBTiMeter Calculation method is as follows:
WBYT i = WB 1 i × ( 1 - 1 1 - M T × ( 1 - Σ j = x - m + 1 1 ( M 1 j / m ) )
Wherein, WB1iRoll tired for the grain quality of entering of m arid cycle in front i arid cycle Add.
The purpose of the present invention is come real also by a kind of continuous way corn drying automatic operating system Existing, including: wet grain grain storehouse before tower, the plate installed bottom it is used for controlling corn interval and enters Entering drying machine main body, 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, its grain after storing and drying, after described tower, solid food stores up temporarily Position in storehouse is in the opposite side of drying machine main body;
Drying machine main body, is from top to bottom divided into grain storage section, dryer section, cooling section and row's grain in it Mechanism, for drying grain;
LOAD CELLS, it is the mass change of grain, described title in weighing drying machine main body Weight sensor is arranged on the bottom of drying machine main body.
Preferably, it uses interval to enter grain and the drying operation mode of row's grain, slotting by controlling Plate, controls to be dried in corn interval enters drying machine main body, transports by controlling draining crop mechanism Turn, control corn interval discharge drying machine main body and terminate to be dried.
The present invention at least includes following beneficial effect: 1, monitored dry in real time by LOAD CELLS The weight of dry machine, immediately arrives at dried grain moisture, thus adjusts and control drying time to do Dry rear grain moisture and Target moisture in range of error, the corn drying moisture being precisely controlled. 2, the precision of water content detection universe is better than ± 0.5%, controls dry run implementation goal, limits Speed controls and constant speed controls, and not only increases the automaticity of drying machine, and is capable of Energy-saving drying and preserved drying.
Part is embodied by the further advantage of the present invention, target and feature by description below, portion Divide also by by the research of the present invention and practice are understood by the person skilled in the art.
Accompanying drawing explanation
Fig. 1 is drying system operation process chart of the present invention.
Fig. 2 is drying system superstructure schematic diagram of the present invention.
Fig. 3 is drying system substructure schematic diagram of the present invention.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings, to make people in the art Member can implement according to this with reference to description word.
Should manage, used herein such as " have ", " comprising " and " including " term Do not allot other element one or more or the existence of a combination thereof or interpolation.
Step one, job initialization: input in the control display unit of drying machine and storage is treated The initial average water score value M of dried grain0, Target moisture value MT, thermal medium humiture T, Row's grain frequency Gg
Step 2, detection tare weight: LOAD CELLS group, LOAD CELLS are installed in drying machine bottom The weight of detection drying machine, the weight of drying machine includes drying machine main body and the weight of Qi Nei corn Amount;When dryer inner is without grain, LOAD CELLS group is utilized the signal of telecommunication to be detected, LOAD CELLS group connects signal test and conversion unit, and signal test and conversion unit is by telecommunications Number being converted to weight signal, signal test and conversion unit connects and controls display unit, by controlling Display unit detects, reads and store tare weight Wb
Step 3, enter grain operation first: use double limit Level control to start into grain operation, manually Or startup drying machine enters grain automatically, carries high moisture grains to be dried in drying machine, when being dried In machine, corn reaches level sensor position, is automatically stopped into grain;When in drying machine, corn is low In lower level sensor position, it is again started up into grain device;
Step 4, start continuous drying operation: by intervals and sequence starting air-introduced machine, Heater and delivery device, drying machine is through entering the grain time and entering grain Δ stabilization time ζ1i, idle Time Δ ζai, row the grain time and row grain Δ stabilization time ζ2iAfter complete one arid cycle Δ ζi
Δζi=Δ ζ1i+Δζ2i+Δζai (1)
Step 5, monitor continuous drying process, obtain drying machine row's grain moisture and roll cumulative MB2i:
1. in i & lt arid cycle, by control with display unit detection, read and store Single enters grain and high charge level quality WH after stabilization timei, quality WM after free timei, single Row's grain and low material position quality WL after stabilization timei, enter grain average moisture M1i, calculate list with this Secondary enter grain quality W1i, enter dry biomass WG1i, enter water quality WS1i, single row grain matter Amount W2i, discharge water quality WS2i, dehydration quality WTiGrain moisture M is arranged with single2i, i.e. formula (2) -(8)。
W1i=WHi-WLi-1+((WHi-WMi)/Δξai)·Δξ1i (2)
W2i=WHi-WLi-((WHi-WMi)/Δξai)·(Δξ2i+Δξai) (3)
WG1i=W1i·(1-M1i) (4)
WS1i=W1i·M1i (5)
WS2i=W2i-WG1i (6)
WTi=WS1i-WS2i (7)
M 2 i = 1 - WG 1 i W 2 i - - - ( 8 )
Wherein, WHiFor LOAD CELLS measure drying machine i & lt enter grain and enter grain stablize time High charge level quality after between, kg;WMiThe drying machine i & lt measured for LOAD CELLS is idle Quality after time, kg;WLiThe drying machine i & lt measured for LOAD CELLS is entered grain and enters grain Single row's grain after stabilization time and low material position quality, kg after stabilization time;M1iFor i & lt Enter grain moisture content value;W1iGrain quality, kg is entered for i & lt drying machine single;WG1iIt is i-th Secondary entrance drying machine dry biomass, kg;WS1iWater quality, kg is entered for i & lt drying machine; W2iGrain quality, kg is arranged for i & lt single;WS2iWater quality, kg is discharged for i & lt;WTiFor I & lt dehydration quality, kg;M2iGrain moisture, kg is arranged for i & lt single;ΔζaiFor i & lt Free time, s;Δζ1iEnter the grain time for i & lt and enter grain stabilization time, s;Δζ2iIt is i-th Secondary row's grain time and row grain stabilization time, s;I is number arid cycle, i=1,2,3L L n.
Now introduce concept: roll cumulative, i.e. in front i arid cycle, will wherein m The corresponding data of arid cycle sums up.Roll cumulative mean, in i.e. front i arid cycle The corresponding data of m arid cycle rolls after adding up divided by m.
Grain quality will be entered, enter dry biomass, entrance water quality, row's grain quality, discharge water Quality, dehydration quality add up with carrying out arid cycle rolling, and i.e. obtain into the rolling of grain quality cumulative WB1i, enter dry biomass roll cumulative mean WBG1i, enter water quality and roll cumulative WBS1i, row's grain quality roll cumulative WB2i, discharge water quality and roll cumulative WBS2i, dehydration matter Amount rolls cumulative WBTiThe Δ ζ B that adds up is rolled with arid cyclei, i.e. formula (9)-(15).
WB 1 i = Σ j = i - m + 1 i W 1 j - - - ( 9 )
WB 2 i = Σ j = i - m + 1 i W 2 j - - - ( 10 )
WBG 1 i = WB 1 i · ( 1 - Σ j = i - m + 1 i ( M 1 j / m ) ) - - - ( 11 )
WBS 1 i = WB 1 i · Σ j = i - m + 1 i ( M 1 j / m ) - - - ( 12 )
WBS2i=WB2i-WBG1i (13)
WBTi=WBS1i-WBS2i (14)
ΔζB i = Σ j = i - m + 1 i ( Δζ 1 j + Δζ 2 j + Δζ a j ) - - - ( 15 )
Calculate row's grain moisture according to formula (8)-(14) and roll cumulative mean MB2i:
MB 2 i = 1 - WB 1 i WB 2 i · ( 1 - Σ j = i - m + 1 i ( M 1 j / m ) ) - - - ( 16 )
MB 2 i = 1 - Σ j = i - m + 1 i ( WH j - WL j - 1 + ( WH j - WM j ) × Δξ 1 j Δξ a j ) Σ j = i - m + 1 i ( WH j - WL j - ( WH j - WM j ) × Δξ 2 j + Δξ a j Δξ a j ) · ( 1 - Σ j = i - m + 1 i ( M 1 j / m ) ) - - - ( 7 )
Wherein, WB1iRoll tired for the grain quality of entering of m arid cycle in front i arid cycle Add, kg;WBG1iFor the entrance dry biomass of m arid cycle in front i arid cycle Roll cumulative mean, kg;WBS1iFor the entrance of m arid cycle in front i arid cycle Water quality rolls cumulative, kg;WB2iFor row's grain of m arid cycle in front i arid cycle Quality rolls cumulative, kg;WBS2iFor the discharge of m arid cycle in front i arid cycle Water quality rolls cumulative, kg;WBTiFor the dehydration of m arid cycle in front i arid cycle Quality rolls cumulative, kg;MB2iFor row's grain water of m arid cycle in front i arid cycle Divide and roll cumulative meansigma methods;ΔζBiFor m time arid cycle rolling in front i arid cycle Dynamic cumulative, s;M is for rolling accumulative frequency, m=1,2,3L L n;A=i-m+1, positive integer.
Step 6, the continuous drying process that controls: roll cumulative MB by the row's of calculating grain moisture2iWith Target moisture MTComparison, control free time Δ ζai, i.e. during resident in drying machine of corn Between, the namely speed of corn drying, make the moisture of corn maintain the setting reasonable model of moisture value In enclosing.Moisture content of outlet is high, increases free time, i.e. increases the corn monocycle in drying machine Operating time;Moisture content of outlet is low, reduces free time, i.e. reduces grain list in drying machine The cycleoperation time.
Work as MB2i-MTDuring > δ, then increase the corn time in drying machine, Δζa(i+1)=Δ ζai+Δ;
Work as MB2i-MTDuring=δ, then the corn time in drying machine is constant, Δ ζa(i+1)=Δ ζai
Work as MB2i-MTDuring <-δ, then reduce the corn time in drying machine, Δζa(i+1)=Δ ζai-Δ;
Wherein, δ rolls cumulative moisture deviation for row's grain moisture;Δζa(i+1)Idle for i+1 time Time, s;Δ is that single adjusts time, s;
Following steps are all with MB2i-MTCalculate as a example by during > δ.
Assume into the grain time and enter grain Δ stabilization time ζ1iWith row's grain time and row grain stabilization time not Become, according to the time in formula (18) calculating i+1 time cycle:
Δζi+1=Δ ζ1i+Δζai+Δζ2i+ Δ=Δ ζi+Δ (18)
Step 7, etc. weight Timing:
1. grain average moisture M is entered according to corn to be dried1i, Target moisture value MT, single enters Grain quality W1iAnd enter the cumulative WB of grain quality rolling1i, calculate single and should be dehydrated quality WYTiWith And the rolling that should be dehydrated quality adds up WBYTi, i.e. formula (19)-(21);
WYT i = W 1 i - WG 1 i ( 1 - M T ) - - - ( 19 )
WBYT i = WB 1 i - WBG 1 i ( 1 - M T ) - - - ( 20 )
WBYT i = WB 1 i × ( 1 - 1 1 - M T × ( 1 - Σ j = i - m + 1 i ( M 1 j / m ) ) - - - ( 21 )
Wherein, WYTiIt is for reaching Target moisture value M in single arid cycleTShould be dehydrated matter Amount, kg;WBYTiIt it is the rolling that should be dehydrated quality of m arid cycle in front i arid cycle Dynamic cumulative, kg;
2. assume that the environment that is dried and process conditions are constant, remove high low-moisture specific energy consumption phase With, roll cumulative WBT according to reality dehydration qualityiThe corresponding cycleoperation time rolls tired Add Δ ζ BiDeriving next cycle should be dehydrated quality and roll cumulative WBYTiCorresponding cycleoperation Time rolls cumulative Δ ζ Bi+1, i.e. formula (22).
WBTi:ΔζBi=WBYTi+1:ΔζBi+1=WBYTi+1:(ΔζBi+m×Δlarge) (22)
Wherein, Δ ζ BiAdd up for the time of m arid cycle in front i arid cycle, s; ΔζBi+1Add up for the time of m arid cycle in front i+1 arid cycle, s;ΔlargeFor list Secondary maximal adjustment time, s.
It is calculated single according to formula (15), (18) and (22) and adjusts time Δlarge:
Δ l arg e = ( WYBT i + 1 WBT i - 1 ) × ΔζB i m - - - ( 23 )
Step 8: use the mode of " small step is adjusted slowly " that next operational cycle time is adjusted, When | MB2(i+1)-MT| stop during≤δ adjusting." small step is adjusted slowly " refer to by once required adjust time Between be equally divided into some successive step, it is to avoid single adjusts that amplitude is excessive causes accommodative excess.
Δlargesmall×l (24)
Wherein, ΔsmallTime, s is adjusted for single minimum;L is the step number once adjusted, integer.
Δ is calculated according to formula (9)-(14), (21)-(24)small:
Δ s m a l l = ( WBYT i + 1 WBT i - 1 ) × ΔζB i m · l - - - ( 25 )
2. next cycleoperation time Δ ζi+1For:
Δζi+1=Δ ζismall (26)
Step 9:
Before calculating, in i+1 arid cycle, m arid cycle arranges grain moisture and rolls cumulative mean MB2(i+1)As long as, | MB2(i+1)-MT| > δ, repeat step one and arrive step 4, until |MB2(i+1)-MT| during≤δ, stop adjusting.
A kind of based on mass flow method continuous way corn drying moisture as shown in Figure 1,2 and 3 exists Line TT&C system case.This system before mainly including tower wet grain enter grain device, drying device, tower The temporary storage device of rear solid food, sensor group and control unit.
Before tower, wet grain enters grain device and includes: receiving sieve front conveyor 111, receiving sieve 112, wet Conveyer 113, wet grain grain storehouse warehouse lower plugboard 114 at the bottom of silo, enter grain hopper 115, wet grain Before storehouse, before elevator 116, tower, wet grain grain storehouse 117, wet silo enter grain grain downflow tube 118 and tower Advance grain elevator 119.
Drying device includes: drying machine enter grain grain downflow tube 121, grain storage section 122, dryer section 123, Conveyer 127, hot-air blower at the bottom of hot-flow flue 124, cooling section 125, draining crop mechanism 126, tower 128, drying machine main body 129.
After tower, the temporary storage device of solid food includes: tower heel row grain elevator 131, solid food storehouse enter grain and slip grain Conveyer 134 at the bottom of solid food storehouse 133, solid food storehouse after pipe 132, tower;Solid food awning 135 is with dry Silo heel row grain conveyer 136.
Control unit includes: control and display unit 141, signal test and conversion unit 142.
Sensor group includes: drying machine gross weight (containing corn) LOAD CELLS group 151, material position Sensor 152 and temperature sensing head group.
Drying machine main body 129 is followed successively by grain storage section 122, dryer section 123, cooling from top to bottom Section 125, draining crop mechanism 126.Grain storage section 122 effect is the grain by entering dryer inner Storage temporarily, waits in entrance dryer section 123 and being dried.Preferred as one, drying machine main body Level sensor group 152 is arranged on grain storage section 122.Preferred as one, it is dried for increasing Machine drying capacity and dry rate, dryer inner is provided with multiple dryer section 123, and corn is through many Level is dried, enters cooling section 125 and cools down, if the moisture of corn meets the requirements, and corn warp Conveyer 131 at the bottom of conveyer 127, tower at the bottom of draining crop mechanism 126, tower and solid food storehouse are entered grain and are slipped grain Pipe 132 enters solid food storehouse 133 after tower.Preferred as one, solid food storehouse level sensor after tower Group 152 is arranged on top, solid food storehouse 133 after tower, and level sensor group 152 includes that feeding position passes Sensor and lower level sensor.
Drying machine gross weight (containing corn) LOAD CELLS group 151 includes several LOAD CELLSs, It is installed on column bottom or the column of drying machine base.The mounting means of LOAD CELLS can Determine with the type according to sensor.As further preferably, LOAD CELLS group 151 is to adopt By principle, structure, size, material, range is the most identical with precision the biography of weighing of more than 4 Sensor forms.When corn weight change in drying machine main body 129, drying machine pedestal upright post is held Be stressed generation deformation, and now LOAD CELLS 151 also produces deformation, and foil gauge resistance occurs Change, is converted into voltage signal through bridge circuit, and voltage signal is transferred to signal conversion and inspection Survey unit 142.
Voltage signal is collected and conversion by signal detection and converting unit 142.This unit is by amplifying Filter circuit, analog to digital conversion circuit, house dog circuit, MCU signal processor, RS485 Serial communication railway superstructures.
Filter circuit will be amplified preposition, and eliminate noise with this and amplify signal.Again with analog digital conversion Circuit is connected, and is responsible for being converted into analogue signal being generalized the digital signal that machine receives.Again MCU signal processing circuit is connected with analog digital conversion circuit, is responsible for processing the numeral accepted Signal.House dog circuit is connected with MCU circuit, prevents locked, the loss etc. of program from showing As.Finally the signal handled well by RS485 serial communication circuit and is controlled display unit 141 are connected.
Temperature signal in ambient temperature, drying machine main body 129 is transferred to by temperature sensing head group MCU signal processing circuit.By level sensor group 152 and signal test and conversion unit 142 It is connected, to judge after drying machine main body 129 and tower the height of grain in solid food storehouse 133.Make Preferred for one, level sensor group 152 can use iraser level sensor or blocking rotary type Stuff level switch.
MCU system runs when, for preventing such as program from running mistake, storage was lost efficacy, outward Portion's interference or operate some phenomenons such as incorrect and occur, cause system to enter endless loop and cannot Normal work, need to increase watchdog circuit, and the basic function of watchdog circuit is at running software Program initialization is made after generation problem and misprogramming.Thus can system run into all so Reset at once the when of class interference, the most perfect work of machine self Make stability.At this moment, then by digitized, stable, be transferred to control through the signal of computing With display unit 141.
During drying operation, clear at the beginning of first having to corn to be dried be carried out by receiving sieve 112, Roguing.Corn elevator 116, wet silo before wet silo after cleaning roguing enter grain grain downflow tube 118, before entering tower, wet grain grain storehouse 117 stores up temporarily.Can by the plate 114 controlled under warehouse Realize corn interval and discharge wet grain grain storehouse 117 before tower, via conveyer 113 He at the bottom of wet silo Enter grain hopper 115 and enter tower advance grain elevator 119.Tower advance grain elevator 119 is by corn It is transported to the upper top of drying machine main body 129 from bottom to top, through tower advance elevator 119 with dry Drying machine between dry owner's body 129 enters grain elephant trunk 121 and corn is uniformly sprinkled into drying machine main body In 129, corn leans on gravity downwards respectively through grain storage section 122, dryer section 123, cooling section 125, the side, installation air channel of drying machine main body 129, use air blast mode to be blasted by thermal medium Carry out dried grain in drying machine, enter six vane type draining crop mechanisms 126 after multilevel drying, pass through Control draining crop mechanism 126 can realize corn interval and discharges from draining crop mechanism and control to arrange grain speed Degree.Corn, after draining crop mechanism 126 is discharged, is sent into conveyer at the bottom of tower by conveyer at the bottom of tower 127 131.After corn is transported to tower by conveyer at the bottom of tower 131 from bottom to top, solid food storehouse 133 is upper Top, after conveyer at the bottom of tower 131 and dry tower, grain grain downflow tube is entered in the solid food storehouse between solid food storehouse 133 Corn is sprinkled into after tower in solid food storehouse by 132, completes whole dry run, solid food awning to be entered 135 store.
As further preferably, during drying operation, enter grain process and carry out with row's grain process interval, I.e. enter grain process do not arrange grain, row grain process do not enter grain, can accurately calculate single with this and enter grain With row's grain weight.As further preferably, single will have of short duration after entering grain and arranging grain process Stablize the time of staying, the most neither enter grain and the most do not arrange the grain time, this way it is possible to avoid vibration and list Secondary enter grain or the impact of accuracy of detection of row's not exclusively total on drying machine weight sensor group 121 of grain.
As further preferably, after tower, solid food storehouse 133 uses double spacing Level control, i.e. works as tower When in rear solid food storehouse 133, corn height is higher than high charge level sensor 152, corn is by solid food after tower Storehouse 133 is discharged, and in conveyer 134 at the bottom of solid food storehouse delivers to grain storehouse or transportation vehicle;When When after tower, in solid food storehouse 133, corn height is less than low level sensor 152, solid food storehouse after tower 133 stop row's grain.
In sum, by the manipulation of TT&C system based on corn gross weight water content detection is completed The realization of the investigating method of continuous way grain moisture of based on mass flow method detection.
The present invention at least includes following beneficial effect: 1, monitored dry in real time by LOAD CELLS The weight of dry machine, immediately arrives at dried grain moisture, thus adjusts and control drying time to do Dry rear grain moisture and Target moisture in range of error, the corn drying moisture being precisely controlled. 2, the precision of water content detection universe is better than ± 0.5%, controls dry run implementation goal, limits Speed controls and constant speed controls, and not only increases the automaticity of drying machine, and is capable of Energy-saving drying and preserved drying.
Although embodiment of the present invention are disclosed as above, but its be not restricted to description and Listed utilization in embodiment.It can be applied to various applicable the field of the invention completely. For those skilled in the art, it is easily achieved other amendment.Therefore do not carrying on the back Under the general concept that claim and equivalency range are limited, the present invention is not limited to specifically Details and shown here as with describe legend.

Claims (10)

1. a continuous way corn drying moisture on-line measuring method based on mass flow method, it is characterised in that Comprise the following steps:
Step one, starts drying machine and starts to be dried, through entering the grain time and entering grain Δ stabilization time ζ1i, idle time Between Δ ζai, row the grain time and row grain Δ stabilization time ζ2iAfter complete one arid cycle Δ ζi, calculate i-th Cycle enter grain quality W1i:
W1i=WHi-WLi-1+((WHi-WMi)/Δξai)·Δξ1i
Wherein, WHiThe high charge level quality of drying machine after entering grain for i & lt and enter grain stabilization time;WLi-1For The low material position quality of drying machine after the i-th-1 time row's grain and row grain stabilization time;WMiFor i & lt free time Rear drying machine quality;Δζ1iEnter the grain time for i & lt and enter grain stabilization time;ΔζaiDuring for the i & lt free time Between;I represents arid cycle;
Step 2, calculates row's grain quality W in i-th cycle2i:
W2i=WHi-WLi-((WHi-WMi)/Δξai)·(Δξ2i+Δξai)
Wherein, WLiFor the low material position quality of drying machine after i & lt row's grain and row grain stabilization time;Δζ2iFor I & lt row's grain time and row grain stabilization time;
Step 3, calculates drying machine i & lt row grain moisture M2i:
M 2 i = 1 - W 1 i ( 1 - M 1 i ) W 2 i
Wherein, M1iThe grain moisture content of drying machine is entered for i & lt.
2. continuous way corn drying moisture on-line measurement side based on mass flow method as claimed in claim 1 Method, it is characterised in that described drying machine is through entering grain and Δ ζ stabilization time1iAfter stop into grain, when the free time Between Δ ζaiAfter start to arrange grain, through row grain and row grain Δ stabilization time ζ2iRear stopping arranges grain, enters grain and row's grain interval Alternately, and at Δ ζ arid cycleiThe most all carrying out continuous drying operation.
3. continuous way corn drying moisture on-line based on mass flow method as claimed in claim 1 or 2 is measured Method, it is characterised in that described arid cycle Δ ζiComputing formula be:
Δζi=Δ ζ1i+Δζ2i+Δζai
Wherein, Δ ζiI-th arid cycle for drying machine.
4. continuous way corn drying moisture on-line measurement side based on mass flow method as claimed in claim 1 Method, it is characterised in that described drying machine uses double limit material interdigit to have a rest and arranges the operating type of grain, when solid food storehouse Interior grain reaches upper limit level sensor position, automatically starts row's grain conveyer, starts to arrange grain;When dry In silo, grain is less than lower limit level sensor position, the row's of being automatically stopped grain conveyer, stops row's grain.
5. the time-controllable method of a corn drying moisture based on mass flow method, it is characterised in that use Moisture on-line measuring method described in any one of claim 1-4, comprises the following steps:
Step one, before calculating, in i arid cycle, m arid cycle arranges grain moisture and rolls cumulative mean MB2i
MB 2 i = Σ j = i - m + 1 i ( M 2 j / m )
Wherein, m is for rolling accumulative frequency;M2jFor drying machine jth time row's grain moisture;
Step 2, when | MB2i-MT| during > δ, calculate the maximum adjustment in i.e. i+1 cycle in next cycle Time Δlarge:
Δ l arg e = ( WBYT i + 1 WBT i - 1 ) × ΔζB i m
Wherein, WBTiRoll cumulative for m actual dehydration arid cycle quality in front i cycle period; ΔζBiRoll cumulative for the drying time of m arid cycle in front i arid cycle;WBYTi+1For front i+1 In secondary arid cycle, the desired dehydration quality of m arid cycle rolls cumulative;MTFor Target moisture value;δ For moisture deviation;
Step 3: to maximal adjustment time ΔlargeThe mode using small step to adjust slowly is adjusted:
Δ s m a l l = Δ l arg e l = ( WYBT i + 1 WBT i - 1 ) × ΔζB i m × 1 l
Wherein, ΔsmallThe time is adjusted for single minimum;L is the step number that small step is adjusted slowly;
Step 4, calculates Δ ζ cycle time in i+1 time cyclei+1:
Work as MB2i-MTDuring > δ, then increase the free time of drying machine, Δ ζa(i+1)=Δ ζaismall
Work as MB2i-MTDuring=δ, then the free time of drying machine is constant, Δ ζa(i+1)=Δ ζai
Work as MB2i-MTDuring <-δ, then reduce the free time of drying machine, Δ ζa(i+1)=Δ ζaismall
Step 5: before calculating, in i+1 arid cycle, m arid cycle arranges grain moisture and roll cumulative mean MB2(i+1)As long as, | MB2(i+1)-MT| > δ, repeat step one and arrive step 4, until | MB2(i+1)-MT| during≤δ, Stop adjusting.
6. the time-controllable method of corn drying moisture based on mass flow method as claimed in claim 5, its It is characterised by, Δ ζ B in described step 3iComputing formula is:
ΔζB i = Σ j = i - m + 1 i ( Δζ 1 j + Δζ 2 j + Δζ a j )
Wherein, Δ ζ BiRoll cumulative for the time of m arid cycle in i arid cycle.
7. the time-controllable method of corn drying moisture based on mass flow method as claimed in claim 5, its Being characterised by, in described step 3, in front i cycle period, the dehydration quality of m arid cycle rolls tired Add WBTiComputing formula is:
WBT i = Σ j = i - m + 1 i ( W 1 j - W 2 j )
In formula, W1jGrain quality is entered for j time;W2jGrain quality is discharged for j time.
8. the time-controllable method of corn drying moisture based on mass flow method as claimed in claim 5, its Being characterised by, the quality that should be dehydrated in described step 3 rolls cumulative WYBTiComputational methods are as follows:
WBYT i = WB 1 i × ( 1 - 1 1 - M T × ( 1 - Σ j = i - m + 1 i ( M 1 j / m ) )
Wherein, WB1iRoll cumulative for the grain quality of entering of m arid cycle in front i arid cycle.
9. continuous way of based on method described in any one of claim 1-8 a corn drying automatic job system System, it is characterised in that described system includes:
Wet grain grain storehouse before tower, the plate installed bottom it is used for controlling corn interval and enters drying machine main body, 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, its grain after storing and drying, after described tower, the temporary warehouse of solid food is positioned at The opposite side of drying machine main body;
LOAD CELLS, it is the mass change of grain, described weighing and sensing in weighing drying machine main body Device is arranged on the bottom of drying machine main body.
A kind of continuous way corn drying automatic operating system the most according to claim 9, its feature Being, described system uses interval to enter grain and the drying operation mode of row's grain, and plate controls corn interval and enters It is dried in entering drying machine main body;Operate by controlling draining crop mechanism, control corn interval discharge and be dried Owner's body terminates to be dried.
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