CN105843296B - The temperature control device of press oven - Google Patents
The temperature control device of press oven Download PDFInfo
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- CN105843296B CN105843296B CN201610169503.0A CN201610169503A CN105843296B CN 105843296 B CN105843296 B CN 105843296B CN 201610169503 A CN201610169503 A CN 201610169503A CN 105843296 B CN105843296 B CN 105843296B
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
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Abstract
The invention discloses a kind of temperature control device of press oven, belong to printer technology field, including baking oven, heater, Temperature Humidity Sensor, central processing unit, blower fan, humidifier and dehumidifier, the air outlet of the air inlet connection heater of baking oven, dehumidifier is connected between heater and baking oven, the air outlet of baking oven is connected to the air inlet of heater by pipeline, the air inlet connecting fan and humidifier of heater, hot blast flows out from heater, pass through dehumidifier successively, baking oven, pipeline, blower fan and humidifier, Temperature Humidity Sensor is arranged in the air inlet and air outlet and baking oven of heater, Temperature Humidity Sensor connects central processing unit, heater, humidifier and dehumidifier are connected to the output end of central processing unit, action is performed according to the instruction of central processing unit.It is dumb that the present invention solves oven temperature regulation, humidity improper the problem of influenceing printing effect, has that automaticity is high, into baking oven hot gas temperature and humidity it is adjustable the advantages of.
Description
Technical field
The invention belongs to printer technology field, it is related to the monitoring temperature direction of press oven, and in particular to Yi Zhongyin
The temperature control device of brush machine baking oven.
Background technology
At present, using substantial amounts of intaglio press on plastic sheeting, packaging bag and other items impressing pattern.With printing machine
High-volume use, its supporting functional facilities is also in constantly improve.Printing machine must possess and have perfect miscellaneous function facility,
It just can ensure that the quality of printing.The printing machine of complete set must possess and have boiler, baking oven, air supply system, gas extraction system, overlay film
Deng device.Before printing is started, boiler, gas extraction system and air supply system etc. must be just opened in a certain order.
Air supply system is one of important component of miscellaneous function facility in printing machine.After the completion of pattern printing, it is necessary to
It is transferred to baking oven, is connected with the suitable hot gas of temperature control in an oven, accelerates the ink on drying pattern by hot gas.Baking oven
Hot gas to ensure certain temperature, humidity and pressure so that ink drying reach optimum efficiency.So hot gas into baking oven
It must control in appropriate temperature and humidity.Hot gas temperature of the hot gas of baking oven mainly by caused by boiler, being come out from boiler
Degree is higher, and the temperature needed higher than baking oven, this just needs to be equipped with corresponding air supply system, to control its temperature.
The content of the invention
According to above the deficiencies in the prior art, the technical problems to be solved by the invention are to propose a kind of press oven
Temperature control device, by installing Temperature Humidity Sensor in oven heater, carry out data of the Temperature and Humidity module collection and entered according to feedback data
The adjustment of trip temperature and humidity, solve oven temperature regulation it is dumb, humidity it is improper influence printing effect the problem of, have
Automaticity is high, into baking oven hot gas temperature and humidity it is adjustable the advantages of.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of temperature control device of press oven,
The temperature control device of the press oven include baking oven, heater, Temperature Humidity Sensor, central processing unit, blower fan, humidifier and
Dehumidifier, the air outlet of the air inlet connection heater of baking oven, connects dehumidifier, the air outlet of baking oven between heater and baking oven
The air inlet of heater, the air inlet connecting fan and humidifier of heater are connected to by pipeline, hot blast flows out from heater,
Pass through dehumidifier, baking oven, pipeline, blower fan and humidifier successively, Temperature Humidity Sensor is arranged on air inlet and the air-out of heater
In mouth and baking oven, Temperature Humidity Sensor connection central processing unit, heater, humidifier and dehumidifier are connected to central processing unit
Output end, action is performed according to the instruction of central processing unit.
The temperature control device of the press oven also includes cold air mouth, and cold air mouth is connected to the air inlet of heater, cold
Gas port is provided with valve, and valve is connected to central processing unit.The central processing unit include data comparing unit, feedback unit and
Instruct output unit, data comparing unit connection feedback unit, feedback unit link order output unit, instruction output unit company
Connect, blower fan, humidifier and dehumidifier.The Temperature Humidity Sensor is respectively including at least three Temperature Humidity Sensors：First temperature
Humidity sensor, the second Temperature Humidity Sensor and the 3rd Temperature Humidity Sensor, the first Temperature Humidity Sensor are arranged on heater
Air inlet, the second Temperature Humidity Sensor are arranged at the air outlet of heater, and the 3rd Temperature Humidity Sensor is arranged on baking oven
Air inlet, the first Temperature Humidity Sensor, the second Temperature Humidity Sensor and the 3rd Temperature Humidity Sensor are both connected to central processing
Device.The Temperature Humidity Sensor includes semiconductor detection unit, two times transfer unit and signal processing unit, and semiconductor detection is single
Two semiconductor gauge R are provided with memberε1And Rε2It is r installed in radius0Diaphragm on, semiconductor gauge be pressurized change
Output resistance responds, the output end connecting secondary converting unit of semiconductor detection unit, and two times transfer unit receives semiconductor inspection
The output signal of unit is surveyed, electrical response signal is converted to pulse width signal, the output of two times transfer unit by two times transfer unit
End connection signal processing unit, the output signal of signal processing unit Decoupling Analysis two times transfer unit, signal processing unit connect
Connect central processing unit.In the semiconductor detection unit, a semiconductor gauge is arranged on home position, another semiconductor
Foil gauge is arranged on centered on the diaphragm center of circle, radius 0.89r0Concentric circles position on.The two times transfer unit includes
Two identical pulse signal change-over circuits, semiconductor gauge one pulse signal change-over circuit of corresponding connection, pulse
Signaling conversion circuit includes 555 timers, resistance R and electric capacity C, and resistance R is connected to No. 2 pins and No. 3 pins of 555 timers
Between, electric capacity C is connected on No. 2 pins of 555 timers, No. 2 pins and No. 6 pin short circuits, and No. 3 pins and No. 7 pins are short
Connect, No. 7 pin output pulse width signals of 555 timers to signal processing unit.The diaphragm is according in semiconductor detection unit
The strain variations of two semiconductor gauges be divided into normal strain section and negative strain section, with radius 0.63r0Concentric circles be
Boundary.Filament saturation water vapor partial pressure table is provided with the signal processing unit, signal processing unit calls corresponding using temperature value
Saturation vapour partial pressure value.The Temperature Humidity Sensor is arranged in the cup-shaped support of cylinder, and diaphragm arrangement is in cup-shaped support
Upper surface, diaphragm select brass diaphragm, and aeroseal chamber, two semiconductor gauges are provided between cup-shaped support and brass diaphragm
Installed in the surface of brass diaphragm.
Present invention has the advantages that:The present invention provides a kind of temperature control device of press oven, and device is using measurement in real time
Into the temperature and relative humidity of the hot blast of baking oven, and the relative humidity of hot blast, ensure temperature, humidity into the hot gas of baking oven
And pressure, ink drying is reached optimum efficiency.Real-time detector data simultaneously feeds back to heater, so as to adjust the output of heater
Hot air temperature, if output hot gas still can not reach requirement, and, regulation is defeated during in the position of air outlet, increase cold air is carried out
Go out the suitable hot gas of humiture.
Brief description of the drawings
The content expressed by this specification accompanying drawing and the mark in figure are briefly described below：
Fig. 1 is the work structuring block diagram of the temperature control device of the press oven of the embodiment of the present invention.
Fig. 2 be the present invention embodiment sensor in foil gauge scheme of installation.
Fig. 3 is the structural representation of the sensor of the embodiment of the present invention.
Fig. 4 is the diagram of strains of the foil gauge of the embodiment of the present invention.
Fig. 5 is the sensor operating principles structured flowchart of the embodiment of the present invention.
Fig. 6 is the signal flow block diagram of the sensor of the embodiment of the present invention.
Fig. 7 is the pulse width signal change-over circuit figure of the embodiment of the present invention.
1 is cup-shaped support in figure, and 2 be aeroseal chamber, and 3 be diaphragm, and 4 be semiconductor gauge Rε1, 5 be semiconductor strain
Piece Rε2, 6 be baking oven, and 7 be heater, and 8 be blower fan, and 9 be humidifier, and 10 be dehumidifier, and 11 be the first Temperature Humidity Sensor, and 12 are
Second Temperature Humidity Sensor, 13 be the 3rd Temperature Humidity Sensor, and 14 be cold air mouth, and 15 be valve.
Embodiment
Below against accompanying drawing, by the description to embodiment, for example involved each component of embodiment of the invention
Shape, construction, the mutual alignment and annexation between each several part, the effect of each several part and operation principle, manufacturing process and
Operate with method etc., is described in further detail, to help those skilled in the art to inventive concept of the invention, technology
Scheme has more complete, accurate and deep understanding.
As shown in figure 1, the temperature control device of press oven 6 includes baking oven 6, heater 7, Temperature Humidity Sensor, centre
Manage device, blower fan 8, humidifier 9, dehumidifier 10, the air outlet of the air inlet connection heater 7 of baking oven 6, heater 7 and baking oven 6 it
Between connect dehumidifier 10, the air outlet of baking oven 6 is connected to the air inlet of heater 7 by pipeline, and the waste gas of baking oven 6 passes through pipeline
It is transported in heater 7 and carries out secondary use, the air inlet connection of heater 7 also has blower fan 8 and humidifier 9.Hot blast is from heating
Device 7 flows out, successively by dehumidifier 10, baking oven 6, pipeline, blower fan 8 and humidifier 9.Temperature Humidity Sensor installation heater 7
In air inlet and air outlet and baking oven 6, comprehensive detection heater 7 needs the relative humidity of the hot air temperature and needs provided,
Central processing unit is sent to, Temperature Humidity Sensor connection central processing unit, central processing unit is according to real-time detector data and system
The threshold value humiture of setting, issue instructions to heater 7, humidifier 9 and dehumidifier 10, heater 7, humidifier 9 and dehumidifier
10 are connected to the output end of central processing unit, and action is performed according to the instruction of central processing unit.
The air outlet of the air inlet connection heater 7 of baking oven 6, baking oven 6 are used to dry printing fabric, pattern printing
After the completion of, it is necessary to baking oven 6 is transmitted it to, the suitable hot gas of temperature control is connected with baking oven 6, drying figure is accelerated by hot gas
Ink in case.In order to ensure that the humiture into baking oven 6 is suitable, the present invention has re-mounted multiple Temperature Humidity Sensors and entered
Row temperature and humidity measurement.
First Temperature Humidity Sensor 11 be arranged on heater 7 air inlet, the front of blower fan 8, for detect treat by
The gas humiture of blower fan 8, is input to central processing unit, is judged to determine that the operating power of heater 7 is adapted to by central processing unit
Select great.The heating power of heater 7 is distinguishing, is divided into multistage gear, and the heating of heater 7 can be controlled to imitate
Rate, heating is slow, and under the blowing of blower fan 8, so as to which temperature is relatively low, heating is fast, and temperature is relatively high.In addition, the air intake of heater 7
Mouth there is also mounted cold air mouth 14, and too high in the temperature of air inlet, it is necessary to when cooling, center, which is converged, issues instructions to cold air mouth
14, cold air mouth 14 is opened, cold air is mixed into heater 7, adjusts the output temperature of heater 7.And can be through by the gas of blower fan 8
Humidifier 9 is crossed, central processing unit detects data according to the relative humidity of the first Temperature Humidity Sensor 11, judges that output whether should
Gas is humidified, the level threshold value scope provided with relative humidity in central processing unit, humidifier 9 is according to central processing unit
Instruction sprinkling water smoke in the gas of flowing.
Second Temperature Humidity Sensor 12 be arranged on heater 7 air outlet, the front of dehumidifier 10, heater 7 flow out
Gas flows through dehumidifier 10 after the second Temperature Humidity Sensor 12, detects the hot gas state of the air outlet of heater 7 in real time, including
Temperature and humidity, central processing unit is according to the testing number of the second Temperature Humidity Sensor 12 it is judged that the output humiture of heater 7
It is whether suitable, work order is sent if temperature humidity is too high and is opened to dehumidifier 10 and cold air mouth 14, cold air mouth 14, is dehumidified
Machine 10 starts, and primary dehumidification operation is carried out to hot gas, then inputs hot gas into baking oven 6, reduces follow-up temperature, adjusts gas
Temperature.
3rd Temperature Humidity Sensor 13 is arranged on the air inlet of baking oven 6, for detecting the temperature for being input to hot gas in baking oven 6
Humidity, and central processing unit is sent to, central processing unit judges whether the drying gas that baking oven 6 receives meets standard, if is
Gas in the range of optimal Threshold of Temperature And Humidity, the gas feedback adjust instruction that central processing unit exports according to heater 7 arrive
On heater 7 and the humidity processor of correlation.The entrance of heater 7 is connected with blower fan 8 and humidifier 9, if heater 7 exports
The humiture of hot gas is inadequate, and central processing unit can adjust temperature and relative humidity according to feedback.If the air outlet of heater 7
Gas humiture it is too high, the regulation that cold air mouth 14 and dehumidifier 10 carry out temperature and humidity, central processing unit can also be passed through
Regulating command is sent according to real-time detector data automatically, it is not necessary to artificial to monitor and adjust in real time.
Central processing unit needs to judge the data of Temperature Humidity Sensor and sends instruction, so being needed inside central processing unit
Element that will be complicated carries out coordinated work, and central processing unit includes data comparing unit, feedback unit, instructs output single
Member, data comparing unit are provided with the threshold range of temperature and relative humidity, and humiture real-time detector data is input to data and compared
Whether unit is compared exceedes threshold range, and instruction analysis, feedback unit are carried out by feedback unit more than threshold range
It is connected between data comparing unit and instruction output unit, feedback unit refers to according to output signal feedback command athletic performance
The valve 15 of output unit connection heater 7, humidifier 9, dehumidifier 10 and cold air mouth 14 is made, instruction output unit controls cold
The unlatching of gas port valve 15 and unlatching size.Instruction output unit is not merely output operating instruction action equipment, also to be controlled
The work of equipment is powerful, and heater 7, humidifier 9, the valve of dehumidifier 10 and cold air mouth all need slowly to adjust, and have shelves
The regulation of position, it is impossible to the disposable maximum point for reaching switch.
In order to ensure the measurement accuracy of humiture, the present invention provides the Temperature Humidity Sensor after improving, being capable of integral chemical industry
Make, while measure output temperature and the numerical value of relative humidity, it is simple in construction, isolated using analytic method from many factors excitation
Corresponding transition response, the dry air annular seal space of flexible sheet and cup row bearing composition is devised, and in the circle of diaphragm appearance
The heart and each configuring semiconductor foil gauge of correct position by periphery.A variety of excitation informations in air are received with this device, then
After quadratic transformation and signal transacting, so that it may obtain room temperature, the data message such as relative temperature and atmospheric pressure.Temperature range for-
10-40 DEG C, RH% ranges are 0-100%, and water vapor partial pressure range is 7500Pa.There is no the time lag of traditional dew cell in the device
Long, unstability and it is difficult to maintaining, so as to which the present apparatus keeps the long-time stability of conversion accuracy in adverse circumstances, and just
In maintenance.
Temperature Humidity Sensor, the Temperature Humidity Sensor are included at semiconductor detection unit, two times transfer unit and signal
Unit is managed, two semiconductor gauge R are provided with semiconductor detection unitε1And Rε2It is r installed in radius0Diaphragm on, partly lead
Body strain piece by piezoresistance change output resistance response, the output end connecting secondary converting unit of semiconductor detection unit,
Two times transfer unit receives the output signal of semiconductor detection unit, and electrical response signal is converted to pulsewidth by two times transfer unit
Signal, the output end connection signal processing unit of two times transfer unit, signal processing unit Decoupling Analysis two times transfer unit
Output signal, central processing unit connection signal processing unit be used for show the mount point that signal processing unit calculates temperature,
Relative humidity and atmospheric pressure, display screen is provided with central processing unit and is used for showing signal and real-time detector data.
In the semiconductor detection unit, the resistance change of two semiconductor gauges is equal, one of semiconductor
Foil gauge is arranged on home position, and another semiconductor gauge is arranged on radius 0.89r0Concentric circles position on.It is described
Two times transfer unit includes two identical pulse signal change-over circuits, and a semiconductor gauge is corresponding to connect a pulse letter
Number change-over circuit, pulse signal change-over circuit include 555 timers, resistance R and electric capacity C, and resistance R is connected to the 2 of 555 timers
Number between pin and No. 3 pins, electric capacity C is connected on No. 2 pins of 555 timers, No. 2 pins and No. 6 pin short circuits, No. 3
Pin and No. 7 pin short circuits, No. 7 pin output pulse widths of 555 timers are signally attached to signal processing unit.The pulse letter
The pulse width conversion formula of number change-over circuit is τ=ln2CR, and τ is output pulse width in formula, and R is the resistance in circuit, and C is cloud
Female mark pseudo-capacitance, pulsewidth output τ are directly proportional to respective institute connecting resistance R.Two in semiconductor detection unit of the diaphragm
The strain variation of semiconductor gauge is divided into normal strain section and negative strain section, with radius 0.63r0Concentric circles be boundary.Institute
State and GPS unit and atmospheric pressure numerical tabular are provided with signal processing unit, GPS unit, which is connected on signal processing unit, to be used for positioning
The longitude and latitude of sensor mount point, inquire about the atmospheric pressure numerical value of mount point.Filament saturation water is provided with the signal processing unit
Vapour partial pressure table, signal processing unit call corresponding saturation vapour partial pressure value using temperature.The Temperature Humidity Sensor is arranged on
In the cup-shaped support 1 of cylinder, diaphragm 3 is arranged on the upper surface of cup-shaped support 1, and diaphragm 3 selects brass diaphragm, cup-shaped support 1
Aeroseal chamber 2 is provided between brass diaphragm, two semiconductor gauges 4 and 5 are arranged on the surface of brass diaphragm.
The signal processing unit utilizes the difference of steam partial pressure and sensitive resistance in air, the arteries and veins after quadratic transformation
The difference of counting wide and its to frequency all the time is directly proportional, and the counting sum of atmospheric temperature and sensing element is in the corresponding letter of monodrome
Number relation, calculates differential pressure value suffered by foil gauge, steam partial pressure value and temperature value.The signal processing unit is satisfied using temperature
With water vapor partial pressure table, corresponding saturation vapour partial pressure value is called using temperature value, is calculated relatively according to the formula of relative humidity
Humidity.
The control method of Temperature Humidity Sensor, methods described step include：Step 1: connection install sensor circuit, if
Put two semiconductor gauge collecting temperatures and air pressure；Step 2: the installation site of two semiconductor gauges of adjustment, confirms two
The resistance change of individual semiconductor gauge is equal；Step 3: the resistance change of semiconductor gauge is input to two times transfer
Unit carries out pulse width conversion, output pulse width signal；Step 4: signal processing unit receives the pulsewidth letter of two times transfer unit output
Number, the variable quantity of semiconductor gauge is analyzed using Dalton's law, foil gauge principle and analytic method, temperature is parsed and water steams
Qi leel presses information, calculates the relative humidity and atmospheric pressure of tested point；Step 5: signal processing unit connects central processing unit,
Central processing unit shows temperature, relative humidity and the pressure information of tested point.
The signal processing unit utilizes the difference of steam partial pressure and sensitive resistance semiconductor gauge in air, through two
Pulsewidth after secondary conversion and its difference of the counting to frequency all the time are directly proportional, the counting sum of atmospheric temperature and sensitive resistance
Logarithm inversely, calculate differential pressure value Δ P, steam partial pressure P suffered by foil gaugeWWith temperature value t.The signal transacting
Unit utilizes filament saturation water vapor partial pressure table, corresponding saturation vapour partial pressure value is called according to temperature value, according to relative humidity
FormulaRelative humidity is calculated, in formulaFor relative humidity, PWSFor the saturation in atmospheric pressure at a certain temperature
Water vapor partial pressure power.
First, atmospheric condition parameter
Dalton's law points out that the gross pressure of hybrid atmospheric is equal to the partial pressure sum of each composition gas, such as formula (1) institute
Show：
PM=Pd+PW(Pa) (1)
P in formulaM(Pa) it is the gross pressure of mixed gas, Pd(Pa) it is the partial pressure of dry atmosphere, PW(Pa) it is institute in air
Containing water vapor partial pressure, wherein PWIn PMAccount for lion's share, only 5% or so, therefore PMAnd PdPressure relatively normal atmosphere
Pressure.
Relative humidityFormula be：
In formulaRepresent relative humidity, PWSFor atmospheric pressure at a certain temperature, saturation vapour partial pressure (Pa), it is with temperature
And become, it can be tabled look-up by known temperature or be tried to achieve by regression fit curvilinear equation.It can be obtained by formula (1), if can be surveyed by instrument
Go out differential pressure PM–Pd, you can calculate PW, then with measured temperature, looked in density of moist air, water vapour pressure, the water capacity table of comparisons
To PWS, relative humidity can be calculated by formula (2)
2nd, foil gauge and its transfer characteristic
In sensor foil gauge scheme of installation as shown in Fig. 2 sensor structural representation as shown in figure 3, strain
The transfer characteristic and Strain Distribution of piece are as shown in Figure 4.Warm integrated level relative humidity baroceptor is integrally a cylindrical shape
Shell, shell include cup-shaped support 1 and brass diaphragm (brass diaphragm is diaphragm 3, and diaphragm uses brass material), brass diaphragm
It is covered in cup-shaped support 1, forms an aeroseal chamber 2 therebetween, two semiconductor gauges is arranged on brass diaphragm
On, the resistance variations by measuring semiconductor gauge are calculated in Temperature Humidity Sensor (abbreviation integrated sensor) installation environment
Temperature, relative humidity and atmospheric pressure data.Analysis calculate temperature, relative humidity and two times transfer unit needed for atmospheric pressure,
Signal processing unit may be mounted on 3 on brass diaphragm, can also be arranged on the side of cup-shaped support, be passed by connection
Delivery signal.
Hybrid atmospheric presses PMStepless action is in the outer surface of flexible sheet, the then differential pressure of diaphragm both sides：
Δ P=PM–Pre=PW+Pd-Pre (Pa) (3)
P in formulare=4104(Pa) it is the reference pressure set in annular seal space, Pd=101325 (Pa) are normal atmosphere
Pressure, so as to calculate air reclaimed water partial pressure of vapor PW(Pa)
Under differential pressure Δ P effects, the distribution of membrane surface upper stress and strain is shown below：
Radial stress：
Radial strain：
More preferable from brass membrane flexive in the present invention in formula, E (Pa) is membrane flexive modulus, about 7*1010Pa, μ are about
It is Poisson's ratio for 0.33, r0For the outer radius 40 (mm) of diaphragm 3, h is the diaphragm thickness 0.1 (mm) of diaphragm 3, and b is cup-shaped support
Thickness 5 (mm), the height 10 (mm) of cup-shaped support, Δ P acts on the differential pressure (Pa) of diaphragm both sides, and r (mm) is point of observation
Radius.
If known constant is substituted into (4) formula, circumferential stress σ can be obtainedR=0=8*104*ΔP (Pa) (6)
The sensitivity coefficient K of foil gaugeεWith transfer characteristic such as formula (7) Suo Shi：
R in formula0For t=0 DEG C and εrSheet resistance (Ω), K are strained when=0εAbout 125, Δ RεThen for foil gauge in εrExcitation
The variable quantity (Ω) of lower resistance, (6) formula substitution (7) can be obtained：
If by E=7*1010Pa substitutes into formula and understood, the relative resistance change that foil gauge can be output, under maximum range
Only 10-2Magnitude, therefore quadratic transformation and signal processing circuit need to be added in a device, to obtain required sensitivity and resolution
Power.
3rd, quadratic transformation and signal transmission flow
Operation principle structured flowchart as shown in figure 5, integrated sensor include semiconductor detection unit, two times transfer unit,
Signal processing unit, two semiconductor gauges is provided with semiconductor detection unit, semiconductor gauge is become by piezoresistance
Change output resistance response, the output end connecting secondary converting unit of semiconductor detection unit, two times transfer unit receives semiconductor
Electrical response signal is converted to pulse width signal by the output signal of detection unit, two times transfer unit, two times transfer unit it is defeated
Go out end connection signal processing unit, the output signal of signal processing unit Decoupling Analysis two times transfer unit, central processing unit connects
Connect temperature, relative humidity and atmospheric pressure that signal processing unit is used for showing the mount point that signal processing unit calculates.
Signal flow block diagram is as shown in fig. 6, two times transfer unit includes two identical pulse signal change-over circuits, pulse
Signaling conversion circuit is made up of 555 timer C1 and C2, and two times transfer unit and signal processing unit are additionally provided with gating switch, choosing
Switched with C3, signal processing unit is mainly formed as C4 single-chip microcomputers.R in Fig. 6ε1And Rε2In PWUnder being encouraged with t, each produce different
R1And R2Response, they each produce τ after C1, C2 chip 555 of two identical pulse signal change-over circuits converts1With
τ2(S) pulsewidth exports, and the pulse width signal delivers to C4 single-chip microcomputers and carries out signal transacting again after C3 switching gates.Pulse signal is changed
For circuit as shown in fig. 7, resistance R is connected between No. 2 pins of C timers 555 and No. 3 pins, electric capacity C is connected to 555 timings
On No. 2 pins of device, No. 2 pins and No. 6 pin short circuits, No. 3 pins and No. 7 pin short circuits, No. 7 pins of 555 timers are defeated
Go out pulse width signal and be connected to signal processing unit.Due to the difference of foil gauge, resistance and output pulse width in two impulse circuits
R can be used1And R2、τ1And τ2Represent.
Pulse width conversion formula：τ=ln2CR (S) corresponds to two pulse signal change-over circuits：
τ1=ln2C0·R1 (S) (9)
τ2=ln2C0·R2 (S) (10)
τ in formula1And τ2For two-way pulsewidth output signal, R corresponding to two semiconductor gauges1And R2For semiconductor strain
The increased resistance value measurement unit of piece is Ω, C0(F) it is mica standard electric capacity, about 0.72 × 10-6F, above formula show that pulsewidth is defeated
Go out and respective institute connecting resistance R1And R2It is directly proportional.
4th, in multifactor input, the decoupling processing of response is synthesized
In τ1And τ2In be implied with water vapor partial pressure PWWith two kinds of information of temperature t, it how is allowed in follow-up Data processing
Separation, it need to realize information separation by data decoupler technology and restore.
R1And R2Resistance variations formula is：
R in formula0Resistance on the basis of=1000 Ω；B=4850 (K) is the resistance temperature coefficient of semiconductor gauge；T0=273 (K)
For reference temperature(TR)；T (K) is input temp；ΔRε1With Δ Rε2Respectively R1And R2It is each caused electric under atmospheric pressure excitation
Hinder increment.Two formulas more than, if allowing Δ Rε1With Δ Rε2Numerical value is identical, but positive and negative on the contrary, i.e. (11) and (12) formula is variable
Into：
Two formulas are subtracted each other or are added by more than, so that it may isolate PWWith two kinds of input information of t, that is, R1+R2=f when being addedt(T),
With R1-R2=f when subtracting each otherε(PW), i.e., and with the result of difference only corresponded with single input information, Δ Rε1=-Δ Rε2=Δ
Rε。
Referring to Fig. 3, whole diaphragm outer surface is under differential pressure Δ P effects, with radius r=0.63r0For boundary, divide into positive and negative
Two strain regions.By center of circle part inner circle Wei Zheng ε areas, and periphery excircle part then Wei Fu ε areas are leaned on, in the suitable of this two regions
On position, it can find that ε numerical value is equal but opposite polarity two points, one is in circle centre position, r1=0, and another point passes through (5) formula
It is calculated as r2=0.89r0Place.Two piece performance identical semiconductor gauges are configured on this 2 points, and are allowed on its center and diaphragm
Reference point overlaps, and is then achieved that the quantitative relationship of (13) and (14) formula.
(14) formula is added to obtain (13) formula
ε information has been eliminated in above formula to (R1+R2) quantitative interference, but R1And R2It is respectively coupled to 555 chips
In charge-discharge circuit, therefore can not be by R1And R2Directly it is added, now need to just passes through data operation and handle to realize.If allow pulsewidth
τ1And τ2To clock frequency f in single-chip microcomputer0Count, then have count value N1And N2For：
N1=τ1·f0 (16)
N2=τ2·f0 (17)
τ1+τ2=(N1+N2)/f0 (S) (18)
Simultaneous above formula, and can be obtained by arrangement：
Celsius temperature：T=T-273 (DEG C) (20)
Each constant coefficient is in R in formula0=1000 Ω, C0=7.2*10-6F and f0Calculated under the conditions of=10MHZ.From R1With
R2Two times transfer information in isolate strain and steam partial pressure PWEtc. information, (13) formula is subtracted into (14) formula, can be obtained
R1-R2=2 Δs Rε=2R0Kε·ε (Ω) (21)
Recycle τ1-τ2=(N1-N2)/f0(5), the simultaneous such as (9), (10) formula, it is collated to obtain,
Δ P=10 (N1-N2) (Pa) (22)
Formula (19) and (22) are two kinds of input-output characteristic equations of sensor, have enough sensitivity and divide
Distinguish power.It is knownP in formulaWSCan by temperature t through tabling look-up or following regression equations calculate,
PWS=aEXP (bt) (Pa) (23)
A is 6.16 (Pa) in formula, and b is that 0.064 (1/ DEG C) is fitting constant, then
PWS=6.16EXP (0.064t) (Pa) (24)
Atmospheric pressure is not a definite value, is had differences with the difference of landing pit height above sea level, while also with season temperature
Degree changes and slight change, to PWCalculating can be described approx with following formula：
PW=Δ P+Pre-Bf(T)+h·8.76 (Pa) (25)
H is local height above sea level (m) in formula, and coefficient 8.76 (Pa/m) is atmospheric pressure attenuation slope, and f (T) is temperature adjustmemt
Coefficient can pass through the matched curve of measured data of experiment and be estimated.Due to being in coastal area winter summer air pressure change ratio
1.02, and be only 1.0026 in Qinghai Area winter Charpy.Decline with temperature and be increased slightly.Therefore the small shadow of temperature ought not be considered
Ring, and at coastal area, (25) formula can be reduced to：
PW=Δ P+ (Pre- B)=10 (N1-N2)+(Pre-B) (Pa) (26)
One of theoretical foundation of this paper resolvings is that standard atmospheric pressure is constant, and actual atmospheric pressure is with local height above sea level
Degree and becomes, when device territory of use height above sea level and it is larger with reference to difference in height when, B should give school by software in formula (3)
Just, to maintain the data conversion precision of water vapor partial pressure power.So the present invention is provided with GPS unit and air in signal processing unit
Numerical tabular is pressed, GPS unit is connected to the longitude and latitude for being used for alignment sensor mount point on signal processing unit, inquires about mount point
Atmospheric pressure numerical value is the partial pressure of the dry air intracavitary in sensor, and the air reclaimed water that binding signal processing unit calculates is steamed
Qi leel pressure value, and then utilize formula (1)：PM=B+PW(Pa) pressure of the pressure value of hybrid atmospheric, i.e. mount point is calculated
Value.
So far, the numerical value of temperature, relative humidity and atmospheric pressure, which can calculate to solve, comes.Humiture provided by the invention passes
Sensor has simple in construction, easy to implement.Obtained in the present invention through analytic method：In air steam partial pressure and sensitive resistance it
The difference of difference, i.e., the pulsewidth after quadratic transformation and its counting to frequency all the time, it is directly proportional, and atmospheric temperature then with sensitivity
The logarithm of the counting sum of element is inversely.The theoretical foundation of this paper resolvings is that physical atmosphere is constant, actual
Atmospheric pressure become with local height above sea level, when device territory of use height above sea level with it is larger with reference to difference in height when, should pass through
Software is corrected, to maintain the data conversion precision of water vapor partial pressure power.
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that present invention specific implementation is not by aforesaid way
Limitation, as long as the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress is employed, or without changing
Enter and the design of the present invention and technical scheme are directly applied into other occasions, within protection scope of the present invention.This hair
Bright protection domain should be determined by the scope of protection defined in the claims.
Claims (6)
1. a kind of temperature control device of press oven, it is characterised in that the temperature control device of the press oven includes baking oven, added
Hot device, Temperature Humidity Sensor, central processing unit, blower fan, humidifier and dehumidifier, the air-out of the air inlet connection heater of baking oven
Mouthful, dehumidifier is connected between heater and baking oven, the air outlet of baking oven is connected to the air inlet of heater, heater by pipeline
Air inlet connecting fan and humidifier, hot blast from heater flow out, successively by dehumidifier, baking oven, pipeline, blower fan and humidification
Machine, Temperature Humidity Sensor are arranged in the air inlet and air outlet and baking oven of heater, Temperature Humidity Sensor connection central processing
Device, heater, humidifier and dehumidifier are connected to the output end of central processing unit, are performed according to the instruction of central processing unit dynamic
Make；The temperature control device of press oven also includes cold air mouth, and cold air mouth is connected to the air inlet of heater, and cold air mouth is provided with
Valve, valve are connected to central processing unit；Temperature Humidity Sensor is included at semiconductor detection unit, two times transfer unit and signal
Unit is managed, two semiconductor gauge R are provided with semiconductor detection unitε1（4）And Rε2（5）It is r installed in radius0Diaphragm
On, semiconductor gauge is pressurized the output resistance response that changes, and the output end connecting secondary conversion of semiconductor detection unit is single
Member, two times transfer unit receive the output signal of semiconductor detection unit, and two times transfer unit is converted to electrical response signal
Pulse width signal, the output end connection signal processing unit of two times transfer unit, signal processing unit Decoupling Analysis two times transfer list
The output signal of member, signal processing unit connection central processing unit；Two semiconductors of the diaphragm in semiconductor detection unit
The strain variation of foil gauge is divided into normal strain section and negative strain section, with radius 0.63r0Concentric circles be boundary；It is described partly to lead
In body detection unit, a semiconductor gauge is arranged on home position, and another semiconductor gauge is arranged on to be justified with diaphragm
Centered on the heart, the r of radius 0.890Concentric circles position on.
2. the temperature control device of press oven according to claim 1, it is characterised in that the central processing unit includes number
It is defeated according to comparing unit, feedback unit and instruction output unit, data comparing unit connection feedback unit, feedback unit link order
Go out unit, instruction output unit connecting fan, humidifier and dehumidifier.
3. the temperature control device of press oven according to claim 1, it is characterised in that the Temperature Humidity Sensor includes
At least three Temperature Humidity Sensors are respectively：First Temperature Humidity Sensor, the second Temperature Humidity Sensor and the 3rd temperature and humidity sensing
Device, the first Temperature Humidity Sensor are arranged on the air inlet of heater, and the second Temperature Humidity Sensor is arranged on the air-out of heater
Mouthful place, the 3rd Temperature Humidity Sensor installed in baking oven air inlet, the first Temperature Humidity Sensor, the second Temperature Humidity Sensor and
3rd Temperature Humidity Sensor is both connected to central processing unit.
4. the temperature control device of press oven according to claim 1, it is characterised in that the two times transfer unit bag
Include two identical pulse signal change-over circuits, semiconductor gauge one pulse signal change-over circuit of corresponding connection, arteries and veins
Rushing signaling conversion circuit includes 555 timers, resistance R and electric capacity C, and resistance R is connected to No. 2 pins of 555 timers and No. 3 are drawn
Between pin, electric capacity C is connected on No. 2 pins of 555 timers, No. 2 pins and No. 6 pin short circuits, No. 3 pins and No. 7 pins
Short circuit, No. 7 pin output pulse width signals of 555 timers to signal processing unit.
5. the temperature control device of press oven according to claim 1, it is characterised in that in the signal processing unit
Provided with filament saturation water vapor partial pressure table, signal processing unit calls corresponding saturation vapour partial pressure value using temperature value.
6. the temperature control device of press oven according to claim 1, it is characterised in that the Temperature Humidity Sensor is set
Put the cup-shaped support in cylinder（1）On, diaphragm（3）It is arranged on cup-shaped support（1）Upper surface, diaphragm（3）From brass film
Piece, cup-shaped support（1）Aeroseal chamber is provided between brass diaphragm（2）, two semiconductor gauges（4 and 5）Installed in Huang
The surface of copper film piece.
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| CN201366837Y (en) * | 2009-03-13 | 2009-12-23 | 汕头市华鹰软包装设备总厂有限公司 | Automatic control heating oven of printing coating device |
| CN201741047U (en) * | 2010-07-17 | 2011-02-09 | 厦门正兴宏业印刷有限公司 | Temperature control device of printer ovens |
| CN203267457U (en) * | 2013-05-30 | 2013-11-06 | 浙江南洋科技股份有限公司 | Automatic control device for printing coating drying oven |
| CN203713239U (en) * | 2013-12-13 | 2014-07-16 | 云南华红印刷有限公司 | Temperature control device for oven of printing machine |
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| EP2184576B1 (en) * | 2007-08-27 | 2019-05-15 | Hitachi, Ltd. | Semiconductor strain sensor |
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| CN201366837Y (en) * | 2009-03-13 | 2009-12-23 | 汕头市华鹰软包装设备总厂有限公司 | Automatic control heating oven of printing coating device |
| CN201741047U (en) * | 2010-07-17 | 2011-02-09 | 厦门正兴宏业印刷有限公司 | Temperature control device of printer ovens |
| CN203267457U (en) * | 2013-05-30 | 2013-11-06 | 浙江南洋科技股份有限公司 | Automatic control device for printing coating drying oven |
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Effective date of registration: 20190416 Address after: 436034 Sanjiang Avenue 177, Dianzhen Town, Huarong District, Ezhou City, Hubei Province Patentee after: HUBEI XINJI MEDICINAL PACKAGING CO., LTD. Address before: 241000 No. 8 Beijing Middle Road, Jiujiang District, Wuhu City, Anhui Province Patentee before: Anhui Polytechnic University |