CN201653954U - Lumber drying process parameter automatic detection device - Google Patents
Lumber drying process parameter automatic detection device Download PDFInfo
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- CN201653954U CN201653954U CN2009202441906U CN200920244190U CN201653954U CN 201653954 U CN201653954 U CN 201653954U CN 2009202441906 U CN2009202441906 U CN 2009202441906U CN 200920244190 U CN200920244190 U CN 200920244190U CN 201653954 U CN201653954 U CN 201653954U
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- temperature
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Abstract
The utility model discloses a lumber drying process parameter automatic detection device, which comprises a hardware circuit, a temperature sensor set (1), a lumber moisture content sensor set (2), a multi-channel analog switch (3), a temperature detection circuit (4), a lumber moisture content detection circuit (5), an analog electronic switch (6), a V/F conversion circuit (7), a photoelectric isolation circuit (8), a main controller (9), a watchdog circuit (10), a keyboard display interface circuit (12) and a power supply circuit (13). The main controller (9) detects temperature, lumber moisture content and balance moisture content parameters in lumber drying process on line in real time, the detection circuit adopts a programmed amplifier, and enlarges detection range and improves precision according to the principle of reserve proportionality, and the device further has the function of temperature value compensation, transmits temperature value to a computer via a serial port, adopts an LED for displaying acquired data and provides real-time detection parameters for a lumber drying automatic control system.
Description
Technical field
The utility model provides a kind of timber drying parameter automatic detection apparatus, and use real-time online of timber drying parameter moisture content, equilibrium moisture content, temperature parameter in wood processing field detects automatically.
Background technology
The drying of wood is the link of a kind of production cycle length, big energy-consuming in the wood working.The pattern kind of its heating medium, dry kiln is many, though the existing part of current drying production run utilizes simple instrument and equipment to carry out stage, non-on-line monitoring, but most production run is still to operate with artificial experience and is difficult to produce by the technological datum of science, state can have some drying of wood microcomputer supervising devices outward at present, but most and dry kiln is fixing supporting, and costs an arm and a leg.
Full-fledged gradually along with Wood drying technique, and being extensive use of of computing machine, the drying of wood develop into automatic control based on computing machine by operating personnel's hand-guided.But at present the automaticity of domestic timber drying equipment also has certain gap with comparing abroad.It shows that mainly checkout equipment is outmoded, and many timber drying plants are equipped with cost in order to reduce to send out, and often still adopt manual manipulation mode, and control instrument and pick-up unit are incomplete, and the degree of reliability of equipment work is poor, automatization level is low; Detection method falls behind, survey moisture content with weight method, also rest on the level that artificial reading tables look-up, measuring accuracy is low, test error is big and directly related with operating personnel's skill level, and the labour intensity height, the desiccated wood defective is many, production efficiency is low, energy consumption is big.In recent years, the transmitter and the data acquisition unit of some band microprocessors that released one after another both at home and abroad, though the measuring accuracy height, antijamming capability is strong, has advanced checkout equipment cost height, costs an arm and a leg, and is difficult to and the matching used problem of home equipment; Perhaps have the design circuit complex structure, the hardware debug difficulty is difficult to guarantee system's reliably working; Perhaps parameter detecting is single, does not have temperature compensation function, and the required real-time dry kiln temperature of drying of wood automatic control system, equilibrium moisture content, moisture content parameter can not be provided.By retrieval as 96222663.7 1 kinds of drying of wood microcomputers of Chinese patent supervisory system; Chinese patent 98243294.1 moisture content measurement mechanisms.
Summary of the invention
The purpose of this utility model is to provide a kind of timber drying parameter automatic detection apparatus, can realize that timber drying parameter moisture content, equilibrium moisture content, the real-time online of temperature, wide-range detect automatically.
The utility model comprises sets of temperature sensors, moisture content sensor groups, multiway analog switch, temperature sensing circuit, moisture content testing circuit, simulant electronic switch, V/F change-over circuit, photoelectric isolating circuit, master controller, watchdog circuit, serial communication circuit, keyboard and display interface circuit, power circuit.Master controller is divided into measures CPU and aiding CPU, measuring under the CPU programmed control, sets of temperature sensors, the moisture content sensor groups is with temperature signal, the moisture content conversion of signals is an electric signal, be input to temperature sensing circuit and moisture content testing circuit respectively through multiway analog switch, the testing circuit output signal is under the effect of simulant electronic switch, timesharing input V/F change-over circuit also converts to and the magnitude of voltage frequency value corresponding, be input to the measurement CPU of master controller through photoelectric isolating circuit, measure CPU and pass through software program, calculate tested temperature, moisture content, the equilibrium moisture content parameter value, and will detect data communication to aiding CPU by parallel port; Aiding CPU adopts keyboard LED charactron display interface directly to show image data, simultaneously moisture content is carried out numerical compensation because of the error that temperature variation causes according to software algorithm, can also give computing machine by the serial port communication circuit transmission, controlling automatically for timber drying provides real-time detected parameters.
Moisture content testing circuit of the present utility model adopts programmable amplifier, measure at master controller under the control of CPU, judge the equivalent resistance scope of tested moisture content, and switching range successively, realize segmented gain, programmable amplifier output voltage and tested moisture content equivalent resistance be varied to inverse ratio, enlarged the measurement range of moisture content.Master controller selects for use the WE78E58B of WINBOND company to finish system design as the main control chip, need not to extend out program storage, data-carrier store, bus latch, multifunction programable interface chip, and circuit design structure is simple, and system works is reliable.In addition, because timber is the mineral matter of inner portion to be rolled into a ball and conducts electricity, after the long-time energising of orientation, will be in timber inside and the moisture sensor surface ionization takes place, polarization, thereby directly influence the precision of measurement result, in order to eliminate the measuring error that reason thus causes, there are strict control in polarity and cycle to the timber on-load voltage, therefore, master controller adopts dual-cpu structure, be respectively to measure CPU and aiding CPU, measure CPU and realize 2 temperature in the dry kiln according to detecting sequential, 2 equilibrium moisture contents, the prerequisite task of 6 moisture content data acquisitions; Aiding CPU be responsible for computing, conversion, demonstration, temperature compensation, with the host computer serial communication.Adopt parallel communication transmission data between two CPU, solved the problem that sequential takies a large amount of CPU time and can not be interrupted of measuring from design angle, start communication modes and overcome the slow-footed shortcoming of serial communication, improved the real-time of measuring accuracy and detection, reliability.
Description of drawings
Fig. 1 timber drying parameter automatic detection apparatus block diagram.
Fig. 2 temperature sensing circuit.
Fig. 3 moisture content testing circuit.
Fig. 4 timber drying parameter automatic detection apparatus circuit diagram.
Have among the above figure a: simulant electronic switch (6), V/F change-over circuit (7), photoelectric isolating circuit (8), master controller (9), watchdog circuit (10), power circuit (13).
Have among the figure b: keyboard and display interface circuit (12).
Fig. 5 water percentage temperature compensation program flow diagram.
Embodiment
See also Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the utility model comprises sets of temperature sensors, moisture content sensor groups, multiway analog switch, temperature sensing circuit, moisture content testing circuit, simulant electronic switch, V/F change-over circuit, photoelectric isolating circuit, master controller, watchdog circuit, serial communication circuit, keyboard and display interface circuit, power circuit.Master controller is divided into measures CPU and aiding CPU, measuring under the CPU programmed control, sets of temperature sensors, the moisture content sensor groups is with temperature signal, the moisture content conversion of signals is an electric signal, be input to temperature sensing circuit and moisture content testing circuit respectively through multiway analog switch, the testing circuit output signal is under the effect of simulant electronic switch, timesharing input V/F change-over circuit also converts to and the magnitude of voltage frequency value corresponding, be input to the measurement CPU of master controller through photoelectric isolating circuit, measure CPU and pass through software program, calculate tested temperature, moisture content, the equilibrium moisture content parameter value, and will detect data communication to aiding CPU by parallel port; Aiding CPU adopts keyboard LED charactron display interface directly to show image data, simultaneously moisture content is carried out numerical compensation because of the error that temperature variation causes according to software algorithm, can also give computing machine by the serial port communication circuit transmission, controlling automatically for timber drying provides real-time detected parameters.
In conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4 annexation and principle of work of moving towards each circuit module of explanation the utility model with signal.
During the utility model work, earlier sets of temperature sensors is placed the air outlet and the air intake vent of dry kiln, wherein air outlet and air intake vent are used two platinum resistance temperature sensors respectively, one white the binding up with gauze of drawing, the gauze other end is immersed in the tank, promptly makes gauze often keep moist (wet bulb) by capillary action; Another directly measures kiln temperature (dry bulb).By two temperature sensor detected temperatures and temperature difference between the two, computer programming can draw the equilibrium moisture content in the dry kiln.It is shared with the same testing circuit with temperature probe that the utility model is measured equilibrium moisture content, simplified the system hardware circuit.6 moisture content sensors according to upper, middle and lower, forward and backward position of sound production in the material heap of the timber that is dried.Energized, the main CPU that measures sends control signal, and control multi-channel analog electronic switch 3 loads power supply to temperature sensor, utilizes the four-wire system detection method, and temperature sensor output signal enters temperature sensing circuit 4 through multi-channel analog electronic switch 3.Temperature sensing circuit is seen accompanying drawing 2, when temperature range is-40 ℃～200 ℃, and amplification circuit output end U
TAnd the corresponding relation between the Pt100 platinum resistance temperature sensor is: 19.25mv/ ℃.The output of thermometric amplifying circuit is switched through simulant electronic switch 6, and input V/F converter 7 is through light-coupled isolation 8, the measurement CPU of input master controller 9 calculates the dut temperature value, repeats said process then, gather dry bulb, wet-bulb temperature successively, calculate tested equilibrium moisture content value.
Moisture content is in 5%～95% scope, corresponding equivalent resistance transformation range is hundreds of G Ω～a few k Ω, be the index variation rule between the two, so, when design moisture content metering circuit, the gamut of water percentage adopts the method for segmented gain that the equivalent resistance of tested timber correspondence is divided into four sections, and every section feedback resistance is respectively R
F1, R
F2, R
F3, R
F4
The moisture content testing circuit is seen shown in the accompanying drawing 3, selects for use high precision copped wave from steady nucleus amplifier ICL7650 in the circuit, cooperates relay to constitute programmable amplifier.Measuring principle is:
In the formula: R
xThe equivalent resistance of-tested moisture content; R
f-feedback resistance value; U
MCThe magnitude of voltage of the corresponding moisture content of-output; U
P-be applied to the timing break-in direct current 5V voltage source on the tested timber.
From formula (1) as seen: in each range, work as R
fWhen being definite value, circuit output voltage and tested moisture content equivalent resistance are inversely proportional to.Utilize this method for designing, can enlarge the range ability that electrical measuring method detects moisture content, and measuring accuracy.Output is switched through multi-channel analog electronic switch 6, input V/F conversion 8, and through light-coupled isolation 8, the measurement CPU of input master controller 9 calculates tested moisture content equivalent resistance.
Described master controller is selected the W78E58B chip of WINBOND company for use, this chip and 8031 single-chip microcomputers are compatible fully, scratch-pad memory on the sheet of 256 bytes, electric erasable/programmable storage of 32KB, the data memory addresses space of 64KB, the program memory address space of 64KB is applicable to the system that the program's memory space requirement is big.Select for use the W78E58B design system to need not to extend out program storage, data-carrier store, bus latch, multifunction programable interface, circuit design structure is simple, stable and reliable operation.
Because temperature is the material impact parameter of moisture content, under different temperatures, same moisture content can differ maximum can reach 20%.So, use the resistance measurement moisture content, must be through temperature compensation, to compensate the measuring error that the timber equivalent resistance brings with variation of temperature.In the lumber kiln, the equipment blower fan is to accelerate dry speed, when the positive and negative wind direction of blower fan not simultaneously, the temperature value that is installed in the inside and outside both sides of dry kiln is variant, thus need select for use the appropriate point temperature that water percentage is compensated, this timber drying parameter automatic detection apparatus by with host computer serial port interactive communication, judge the blower fan direction, and select temperature spot that water percentage is done temperature compensation, and in aiding CPU, realize the water percentage temperature compensation, program flow diagram is seen Fig. 4.
Described power circuit adopts the isolated from power technology, makes each circuit module have the power supply of independent isolating power supply, to cut off the various interference that seal in by power supply.Use has the method for the DC/DC transducer acquisition insulating power supply of DC-isolation function, its outer lead is seen accompanying drawing 4, selects DC/DC transducer--5S5/100mA for use, and its output voltage is 5V, output current is 100mA to the maximum, is isolated between input voltage and the output voltage.In addition, also select DC/DC transducer--5D9/100mA for use, its output voltage is ± 9V that output current is 100mA to the maximum, can need the chip power supply of 9V power supply to other, and also be isolated between input voltage and the output voltage.
Described V/F converter circuit is connected U
T(voltage change signal of temperature variation correspondence) and U
MC(water percentage changes corresponding voltage change signal), variation range is :-5V～5V.Through high-precision high-speed V/F converter, meet the Timer T of single-chip microcomputer 78E58 by the output of 3 pin
0, frequency range is: 0Hz～100KHz.
Described display circuit is used to show 2 temperature, 2 equilibrium moisture contents, 6 moisture content parameter values.Keyboard circuit is used for the range and the input mode of measured parameter and selects.
Described serial port communication circuit is used for and upper machine communication, the transmission detected data.
Claims (4)
1. a timber drying parameter automatic detection apparatus is characterized in that comprising sets of temperature sensors (1), moisture content sensor groups (2), multiway analog switch (3), temperature sensing circuit (4), moisture content testing circuit (5), simulant electronic switch (6), V/F change-over circuit (7), photoelectric isolating circuit (8), master controller (9), watchdog circuit (10), serial communication circuit (11), keyboard and display interface circuit (12), power circuit (13); Master controller (9) is divided into measures CPU and aiding CPU, measuring under the CPU programmed control, sets of temperature sensors (1), moisture content sensor groups (2) is with temperature signal, the moisture content conversion of signals is an electric signal, be input to temperature sensing circuit (4) and moisture content testing circuit (5) respectively through multiway analog switch (3), the testing circuit output signal is under the effect of simulant electronic switch (6), timesharing input V/F change-over circuit (7) also converts to and the magnitude of voltage frequency value corresponding, be input to the measurement CPU of master controller (9) through photoelectric isolating circuit (8), measure CPU and pass through software program, calculate tested temperature, moisture content, the equilibrium moisture content parameter value, and will detect data communication to aiding CPU by parallel port; Aiding CPU adopts keyboard LED charactron display interface (12) directly to show image data, simultaneously moisture content is carried out numerical compensation because of the error that temperature variation causes according to software algorithm, can also be transferred to computing machine by serial port communication circuit (11), controlling automatically for timber drying provides real-time detected parameters.
2. according to the described a kind of timber drying parameter automatic detection apparatus of claim 1, it is characterized in that described moisture content testing circuit (5) adopts programmable amplifier, the control of measuring CPU at master controller (9) is the realization segmented gain down, programmable amplifier output voltage and tested moisture content equivalent resistance be varied to inverse ratio.
3. according to the described a kind of timber drying parameter automatic detection apparatus of claim 1, it is characterized in that described master controller (9) adopts the dual-cpu structure of measuring CPU and aiding CPU, measure CPU and realize that according to detecting sequential the dry kiln intrinsic parameter detects; Aiding CPU realize computing, demonstration, temperature compensation, with host computer serial communication function.
4. according to the described a kind of timber drying parameter automatic detection apparatus of claim 1, it is characterized in that described aiding CPU has the positive and negative wind direction selection temperature spot according to blower fan, realizes the temperature compensation function of moisture content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202441906U CN201653954U (en) | 2009-11-25 | 2009-11-25 | Lumber drying process parameter automatic detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202441906U CN201653954U (en) | 2009-11-25 | 2009-11-25 | Lumber drying process parameter automatic detection device |
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| CN201653954U true CN201653954U (en) | 2010-11-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590293A (en) * | 2012-02-07 | 2012-07-18 | 东北林业大学 | Device for detecting moisture content of plates and sorting plates |
| CN103822946A (en) * | 2014-02-26 | 2014-05-28 | 东北林业大学 | Wood moisture content detection method using wood core temperature compensation |
| CN104483231A (en) * | 2014-12-24 | 2015-04-01 | 黑龙江省木材科学研究所 | Wood moisture content detecting and verifying device |
| CN104670839A (en) * | 2013-11-29 | 2015-06-03 | 航天信息股份有限公司 | Material conveying device |
| CN114354021A (en) * | 2021-12-27 | 2022-04-15 | 武汉航空仪表有限责任公司 | Anti-interference pressure transmitting circuit |
-
2009
- 2009-11-25 CN CN2009202441906U patent/CN201653954U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590293A (en) * | 2012-02-07 | 2012-07-18 | 东北林业大学 | Device for detecting moisture content of plates and sorting plates |
| CN104670839A (en) * | 2013-11-29 | 2015-06-03 | 航天信息股份有限公司 | Material conveying device |
| CN103822946A (en) * | 2014-02-26 | 2014-05-28 | 东北林业大学 | Wood moisture content detection method using wood core temperature compensation |
| CN104483231A (en) * | 2014-12-24 | 2015-04-01 | 黑龙江省木材科学研究所 | Wood moisture content detecting and verifying device |
| CN104483231B (en) * | 2014-12-24 | 2017-08-11 | 黑龙江省木材科学研究所 | A kind of moisture content detection check device |
| CN114354021A (en) * | 2021-12-27 | 2022-04-15 | 武汉航空仪表有限责任公司 | Anti-interference pressure transmitting circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20121125 |