CN102495097B - Detection apparatus for liquid chemical product spontaneous combustion temperature - Google Patents

Detection apparatus for liquid chemical product spontaneous combustion temperature Download PDF

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Publication number
CN102495097B
CN102495097B CN 201110389569 CN201110389569A CN102495097B CN 102495097 B CN102495097 B CN 102495097B CN 201110389569 CN201110389569 CN 201110389569 CN 201110389569 A CN201110389569 A CN 201110389569A CN 102495097 B CN102495097 B CN 102495097B
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pin
nonpolar capacitor
resistance
capacitor
ground connection
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CN102495097A (en
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王强
王启
肖琨
范昕炜
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HANGZHOU LIANGTAI TECHNOLOGY Co Ltd
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HANGZHOU LIANGTAI TECHNOLOGY Co Ltd
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Abstract

The invention discloses a detection apparatus for liquid chemical product spontaneous combustion temperature, in the current device, the reaction speed is slow and the large error can be generated due to artificial factors. The apparatus comprises an integral test detection apparatus, a data acquisition circuit and anaphase data treatment. The process comprises the following steps: starting the detection apparatus, placing an inflammable liquid chemical sample in the apparatus, carrying out real time data acquisition through various sensors, sending data to a computer and carrying out data processing to display the values to be measured such as flame spontaneous combustion temperature, cool flame spontaneous combustion temperature, time delay, air pressure value and initial reaction temperature. According to the invention, the security, accuracy and precision of the test are fully considered, the artificial portion can be maximally simplified, the measured value error caused by the manual operation can be reduced, and the each parameter of liquid chemical product spontaneous combustion can be rapidly detected with high efficiency.

Description

Detection apparatus for liquid chemical product spontaneous combustion temperature
Technical field
The invention belongs to the temperature detection technical field, be specifically related to a kind of detection apparatus for liquid chemical product spontaneous combustion temperature.
Background technology
Spontaneous combustion refers to material in the situation without external point burning things which may cause a fire disaster (such as spark or flame) effect, leans on self-heating or outer heat and the phenomenon of generation burning.Generally speaking, slowly oxidizing process all can occur in combustible and contact with air, but speed is very slow, the heat of release also seldom, simultaneously because continuous function of environment heat emission towards periphery can not luminescence phenomenon occur as burning.If temperature raises or other conditions change, oxidizing reaction rate is accelerated, and disengages heat and increases, and can not all just dissipate to accumulate, and the material self-temperature is progressively raise.When arriving the temperature of this material self-burning, will get up by self-burning spontaneous combustion that Here it is.Certain material being heated occur the minimum temperature of spontaneous combustion is exactly the spontaneous ignition temperature of this material, also is self-ignition temperature.That the material that occurs when being lower than self-ignition temperature sends is faint, nattier blue cold light or flame are called cool flame, and the temperature of this moment is called the cool flame self-ignition temperature.Material refers to add the test flask to the time of catching fire from sample from being heated to the time between catching fire, and this time is called ignition delay time.
GB GB/T 21860-2008(is hereinafter to be referred as GB) in stipulated to measure the used part test device of spontaneous ignition temperature of liquid chemical: require the control accuracy of crucible oven ± 1 ℃, homogeneity reaches particular requirement (seeing GB); Requiring temperature thermocouple is K calibration, roc silicate material flask, 500ul~1000ul syringe, timer etc.Stipulated also in the GB that measuring process is followed successively by: temperature control process, control flask interior temperature reaches predetermined value; Add sample, guarantee dark surrounds; Whether experimental observation spontaneous combustion occurs, and relates to repeatedly temperature adjustment (seeing GB) in this process; Increase the test of test specimen amount; The record test figure.Use the variation of the recorder trace flask interior temperature of variable electric potential in the GB, use stopwatch or electronic timer ignition lag.These two kinds of metering systems because these two measurements relate to the mensuration of self-ignition temperature and ignition lag, count for much simultaneously because reaction velocity and the human factor of instrument can produce larger error, improve among the present invention.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of detection apparatus for liquid chemical product spontaneous combustion temperature is provided.
The present invention includes temperature control of pot furnace system, analog to digital conversion circuit, host computer disposal system.The temperature control of pot furnace system comprises crucible oven and temperature controller, analog to digital conversion circuit comprises A/D change-over circuit take microcontroller as core, power circuit, key circuit, visible light sensor array, telecommunication circuit, LED display circuit etc., the host computer disposal system is PC, crucible oven adopts the ceramic fiber insulation material, take resistance wire as heating element, the crucible cover left-right symmetric is divided into two parts, middle perforate, and the aperture is decided according to the aperture of putting into flask.Right-angled glass conduit and temperature thermocouple T put into flask interior, and temperature thermocouple T and grass tube all are fixed on the crucible cover.The flask periphery is evenly wrapped up by aluminium foil, and simultaneously in flask neck bottom, A is wrapped up with aluminium foil respectively in the outside of flask middle part and bottom, B, and three K type thermocouples of C, the lead-in wire of these three thermopairs is drawn from the groove of crucible cover bottom.The visible light sensor array is arranged on iron stand, and the visible light sensor array can be adjusted angle flexibly, and iron stand is placed on crucible oven and covers, and guarantees that simultaneously the hole that the visible light sensor array can see through on the crucible cover monitors the flask interior situation.Middle temperature-control heat couple D is connected on the temperature controller, and as temperature controlled foundation, D is arranged in crucible oven madial wall centre position.The simultaneous temperature controller passes to the temperature value of thermopair D in the PC by the RS485 interface.T, A, B, the simulating signal that four thermopairs of C produce is carried out digital-to-analog conversion with the simulating signal of baroceptor by analog to digital conversion circuit, and the digital signal after the conversion passes in the PC by serial ports.
The visible light sensor array is for to consist of photosensitive array by five visible light sensors.Visible light sensor is mainly responsive to visible light, by regulating inner adjustable resistance and adopting epoxide resin nano packaging sensitization part, can eliminate infrared ray and ultraviolet ray to the impact of sensor devices, reaches the effect of similar human eye.In dark surrounds, catch the visible light that occurs, send out simultaneously corresponding electric signal to microcontroller.By experiment the iron stand clip be arranged in face crucible cover 1 perforate directly over suitable distance.
The A/D change-over circuit becomes digital signal with analog signal conversion, and digital signal passes to the PC storage through microcontroller and telecommunication circuit afterwards, and these data-signals show by the LED display circuit simultaneously.Power circuit provides power supply for the microcontroller operating circuit.Key circuit is as the action of outside input control microcontroller.Then the signal that the visible light sensor array produces at first passes to the PC storage by telecommunication circuit through the processing of microcontroller.Temperature controller is controlled the temperature of crucible oven by temperature-control heat couple, and the temperature that crucible oven is current passes to PC by the RS485 interface simultaneously.
Power circuit part divides and comprises power interface J2; standby power supply interface J1; self-lock switch S2; overcurrent protective switch F1; the first voltage stabilizing diode D13; the first diode D10; the second diode D11; the second triode D12; the first polar capacitor C30; the second polar capacitor C32; the 3rd polar capacitor C34; quadripolarity capacitor C 35; the first nonpolar capacitor C 31; the second nonpolar capacitor C 33; the 3rd nonpolar capacitor C 36; the 4th nonpolar capacitor C 37; the first light emitting diode D14; the second light emitting diode D15; the 3rd light emitting diode D16, the first resistance R 9; the second resistance R 10; the 3rd resistance R 11; the 4th resistance R 12.Power interface J2 is three-pin socket, and 1 pin of J2 connects 2 pin of self-lock switch S2, and 2,3 pin of J2 also connect rear even 5 pin of S2.1 pin of S2 connects the anode of the 3rd diode D12, the 6 pin ground connection of S2, and 3,4 pin of S2 are unsettled.The negative electrode of D12 is connected to the end of overcurrent protective switch F1; the other end of F1 is connected to the negative electrode of the first diode D10, the anode of the first polar capacitor C30, the negative electrode of the first voltage stabilizing diode D13, an end of the first nonpolar capacitor C 31 and the input end of voltage stabilizing chip U5; the U5 output terminal connects anode, the negative electrode of the 3rd diode D11, the positive pole of the second polar capacitor C32, the second nonpolar capacitor C 33 1 ends of the second diode D10; the first resistance R 9 one ends and VCC8 end; the other end of R9 is connected to the positive pole of the first light emitting diode D14, D14 minus earth.The other end of the earth terminal of the other end of the negative pole of the positive pole of voltage stabilizing diode D13, the first polar capacitor C30, the first nonpolar capacitor C 31, voltage stabilizing chip U5, the negative pole of the second polar capacitor C32, the second nonpolar capacitor C 33 and 2 pin of spare interface J1 are ground connection all.1 pin of spare interface J1 connects the positive pole of D11, the output terminal of voltage stabilizing chip U5 is received voltage stabilizing chip U6 input interface, the U6 output terminal is connected with the positive pole of the 3rd polar capacitor C34, an end of the 3rd nonpolar capacitor C 36 and an end of the second resistance R 10, the R10 other end is received the positive pole of the second light emitting diode D15,1 pin of voltage stabilizing chip U5 chip, the negative pole of the 3rd polar capacitor C34, the other end of the 3rd nonpolar capacitor C 36 and the minus earth of the second light emitting diode D15.The U6 output terminal is connected with voltage stabilizing chip U7 input end, the U7 output terminal with to the positive pole of quadripolarity capacitor C 35, an end of the 4th nonpolar capacitor C 37 and an end of the 3rd resistance R 11, the R11 other end is received the positive pole of the 3rd light emitting diode D16,1 interface of voltage stabilizing chip U7, the positive pole of quadripolarity capacitor C 35, the other end of the 4th nonpolar capacitor C 37, the minus earth of the 3rd light emitting diode D16.Power supply ground end links to each other by the 4th resistance R 12 with digital power ground end.
Temperature sensing circuit comprises the 5th resistance R 13, the 6th resistance R 14, the five polar capacitor C38, the 5th nonpolar capacitor C 39, thermometric chip U8.The 5th resistance R 13, the 6th resistance R 14 1 ends are connected to power supply VCC3.3,1 pin of the 5th resistance R 13 another termination U8,2 pin of the 6th resistance R 14 another termination thermometric chip U8.4 pin, 5 pin, 6 pin, the 7 pin ground of thermometric chip U8,8 pin meet power supply VCC3.3.1 pin of thermometric chip U8 connects 47 pin of main control chip U1 simultaneously, 2 pin of thermometric chip U8 connect 46 pin of main control chip U1 simultaneously.
Key circuit partly comprises identical the first to the 8th button totally 8 buttons, a pull-up resistor JP1.All eight button one ends are connected with 2 pin to 9 pin of pull-up resistor JP1,79 pin, 80 pin, 78 pin, 1 pin, 53 pin, 52 pin, 14 pin on the main control chip and the pin of being connected respectively, and the other end of eight buttons is ground connection all.
The LED display circuit partly comprises the 4th light emitting diode D17, the 5th light emitting diode D18, the 6th light emitting diode D19, the 7th light emitting diode D20, the 8th light emitting diode D21, the 9th light emitting diode D22, the tenth light emitting diode D23, the 11 light emitting diode D24.The first exclusion R15, the second exclusion R16.The whole ground connection of the negative electrode of eight light emitting diodes, light emitting diode D17, light emitting diode D18, the 6th light emitting diode D19, the 7th light emitting diode D20 respectively with 2 pin of the first exclusion R15,4 pin, 6 pin, 8 pin connect, the 8th light emitting diode D21, the 9th light emitting diode D22, the tenth light emitting diode D23, the 11 light emitting diode D24 respectively with 2 pin of the second exclusion R16,4 pin, 6 pin, 8 pin connect, 1 pin of the first exclusion R15,3 pin, 5 pin, 7 pin respectively with 61 pin of main control chip, 62 pin, 63 pin, 66 pin connect, the second exclusion R16 respectively with 67 pin of main control chip, 68 pin, 69 pin, 54 pin connect.
Telecommunication circuit partly comprises the 6th nonpolar capacitor C 40, the 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, the 9th nonpolar capacitor C 43, the tenth nonpolar capacitor C 44,16 pin level transferring chip U10,11 needle serial port USART1.
One end of the 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, the tenth nonpolar capacitor C 44 links to each other with 16 pin, 2 pin, 6 pin of level U10 respectively, and the other end of the 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, the tenth nonpolar capacitor C 44 is connected with 15 pin of level transferring chip U10 and ground connection.The 6th capacitor C 40 1 ends connect 1 pin of level transferring chip U10, and the other end connects 3 pin of level transferring chip U10.The 9th electric capacity 43 1 ends connect level transferring chip 4 pins, and the other end connects its 5 pin.13 pin of level transferring chip U10,14 pin are connected with 3 pin, 2 pin of serial ports USART1 respectively.5 pin of serial ports USART1,10 pin, 11 pin ground connection, 16 pin of level transferring chip U10 connect power supply, 11 of level transferring chip U10 is connected with 41 pin of main control chip, 12 of level transferring chip U10 is connected with 42 pin of main control chip, and 7 pin of 1 pin of serial ports USART1,4 pin, 7 pin, 8 pin, 9 pin and level transferring chip U10,8 pin, 9 pin, 10 foot rests are empty.
Accurate A/D analog to digital conversion circuit comprises three master chip U2, U3, U4, magnetic bead FB1, sextupole capacitor C 16, the 7th polar capacitor C19, the 11 nonpolar capacitor C the 17, the 12 nonpolar capacitor C the 18, the 13 nonpolar capacitor C the 15, the 14 nonpolar capacitor C the 21, the 15 nonpolar capacitor C 20, the second voltage stabilizing diode D1, the 7th resistance R 6.
2 pin of U2 are connected with the end of the positive pole of sextupole capacitor C 16, the 11 nonpolar capacitor C 17 1 ends and magnetic bead FB1, another termination of magnetic bead FB1 VCC.The other end ground connection of the other end of sextupole capacitor C 16 and the 11 nonpolar capacitor C 17.6 pin of U2 are connected with an end of the 12 nonpolar capacitor C 18,1 pin of U3.The other end ground connection of the 12 nonpolar capacitor C 18,8 pin of U3 are connected with power supply with an end of the 13 nonpolar capacitor C 15, the other end ground connection of the 13 nonpolar capacitor C 15, the 4 pin ground connection of U3,5 pin of U3 are connected with 10 pin of main control chip U1,6 pin of U3 are connected with 7 pin of main control chip U1,7 pin of U3 are connected with 6 pin of main control chip U1,1 pin of outer input interface P5 is connected with the end of the negative electrode of the second voltage stabilizing diode D1 with the 7th resistance R 6, external interface P5 and the second voltage stabilizing two utmost point D1 other end ground connection.One end of the 7th resistance R 6 another termination the 14 nonpolar capacitor C 21 and 3 pin of U4, the other end ground connection of the 14 nonpolar capacitor C 21,6 pin of U4 are connected with 2 pin of 2 pin of U4, U3.7 pin of U4 are connected with power supply with an end of the positive pole of the 7th polar capacitor C19, the 15 nonpolar capacitor C 20, the other end ground connection of the negative pole of the 7th polar capacitor C19 and the 15 nonpolar capacitor C 20, and the 4 pin ground connection of U4, all the other pins are built on stilts among the U2U3U4.
Conventional A/D analog to digital conversion circuit comprises the 3rd voltage stabilizing diode D2, the 4th voltage stabilizing diode D3, the 5th voltage stabilizing diode D4, the 6th voltage stabilizing diode D5, the 7th voltage stabilizing diode D6, the 8th voltage stabilizing diode D7, the 9th voltage stabilizing diode D8, the tenth voltage stabilizing diode D9.The nonpolar capacitor C of the 16 nonpolar capacitor C 22, the 17 23, the 18 nonpolar capacitor C 24, the nonpolar capacitor C of the 19 nonpolar capacitor C 25, the 20 26, the 21 nonpolar capacitor C 27, the 22 nonpolar capacitor C 28, the 23 nonpolar capacitor C 29.The 3rd exclusion R11, wiring slot P2.The 3rd voltage stabilizing diode D2, the 4th voltage stabilizing diode D3, the 5th voltage stabilizing diode D4, the 6th voltage stabilizing diode D5, the 7th voltage stabilizing diode D6, the 8th voltage stabilizing diode D7, the 9th voltage stabilizing diode D8, the negative pole of the tenth voltage stabilizing diode D9 respectively with 10 pin of wiring slot P2,9 pin, 8 pin, 7 pin, 6 pin, 5 pin, 4 pin, 1 pin of 3 pin and the 3rd exclusion R11,2 pin, 3 pin, 4 pin, 5 pin, 6 pin, 7 pin, 8 pin connect, 1 pin of wiring slot P2,2 pin ground connection, the 16 nonpolar capacitor C 22, the 17 nonpolar capacitor C 23, the 18 nonpolar capacitor C 24, the 19 nonpolar capacitor C 25, the 20 nonpolar capacitor C 26, the 21 nonpolar capacitor C 27, the 22 nonpolar capacitor C 28, the 23 nonpolar capacitor C 29 respectively with 9 pin of R11,10 pin, 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 17 pin of 16 pin and main control chip U1,16 pin, 15 pin, 21 pin, 22 pin, 27 pin, 28 pin, 29 pin connect, and the positive pole of diode and the other end of electric capacity be ground connection all.
The visible light sensor array comprises 10 resistance, 5 rheostats, 5 visible light sensors, 5 electric capacity, wiring slot P9, wiring slot P10.
The 8th resistance R 25 1 ends connect power supply, the other end of the 8th resistance R 25 is connected with 1 pin of visible light sensor U15 power supply, receives 2 pin of interface slot P9 after 2 pin of the 9th resistance R 30 1 ends and the 24 nonpolar capacitor C 62 1 ends, visible light sensor U15 connect.4 pin of visible light sensor U15 are connected with the pin that the first slide rheostat R35 interim pins is connected with R35 in the pin, slide rheostat R35 is left a pin ground connection, ground connection after the 24 nonpolar capacitor C 62 other end ground connection, 3 pin of visible light sensor U15 power supply are connected with the other end of the 9th resistance R 30.
The tenth resistance R 26 1 ends connect power supply, the other end of the tenth resistance R 26 is connected with 1 pin of visible light sensor U16 power supply, receives 1 pin of interface slot P9 after 2 pin of the 11 resistance R 31 1 ends and the 25 nonpolar capacitor C 63 1 ends, visible light sensor U16 connect.4 pin of visible light sensor U16 are connected with the pin that the second slide rheostat R36 interim pins is connected with R36 in the pin, slide rheostat R36 is left a pin ground connection, ground connection after the 25 nonpolar capacitor C 63 other end ground connection, 3 pin of visible light sensor U16 power supply are connected with the other end of the 11 resistance R 31.
The 12 resistance R 22 1 ends connect power supply, the other end of the 12 resistance R 22 is connected with 1 pin of visible light sensor U12 power supply, receives 5 pin of interface slot P9 after 2 pin of the 13 resistance R 27 1 ends and the 26 nonpolar capacitor C 59 1 ends, visible light sensor U12 connect.4 pin of visible light sensor U12 are connected with the pin that the 3rd slide rheostat R32 interim pins is connected with R32 in the pin, slide rheostat R32 is left a pin ground connection, ground connection after the other end ground connection of the 26 nonpolar capacitor C 59,3 pin of visible light sensor U12 power supply are connected with the other end of the 13 resistance R 32.
The 14 resistance R 23 1 ends connect power supply, the other end of the 14 resistance R 23 is connected with 1 pin of visible light sensor U13 power supply, receives 4 pin of interface slot P9 after 2 pin of the 15 resistance R 28 1 ends and the 27 nonpolar capacitor C 60 1 ends, visible light sensor U13 connect.4 pin of visible light sensor U13 are connected with the pin that the 4th slide rheostat R33 interim pins is connected with R33 in the pin, slide rheostat R33 is left a pin ground connection, ground connection after the 27 nonpolar capacitor C 60 other end ground connection, 3 pin of visible light sensor U13 power supply are connected with the other end of the 15 resistance R 28.
The 16 resistance R 24 1 ends connect power supply, the other end of the 16 resistance R 24 is connected with 1 pin of visible light sensor U14 power supply, receives 3 pin of interface slot P9 after 2 pin of the 17 resistance R 29 1 ends and the 28 nonpolar capacitor C 61 1 ends, visible light sensor U14 connect.4 pin of visible light sensor U14 are connected with the pin that the 5th slide rheostat R34 interim pins is connected with R34 in the pin, slide rheostat R34 is left a pin ground connection, ground connection after the other end ground connection of the 28 nonpolar capacitor C 61,3 pin of visible light sensor U14 power supply are connected with the other end of the 17 resistance R 29.
1 pin of wiring slot P10 connects power supply, the 2 pin ground connection of wiring slot P10.
Warning circuit comprises the first hummer LS1, the first triode Q1, the tenth resistance R 3.The first triode Q1 emitter is connected with VCC, and the first triode Q1 base stage is connected with an end of the tenth resistance, and the first triode Q1 collector is connected the minus earth of hummer with the positive pole of hummer.
Microcontroller comprises main control chip U1, contact pin ICSP1, the first crystal oscillator Y1, the 25 nonpolar capacitor C the 7, the 26 nonpolar capacitor C the 8, the 27 nonpolar capacitor C the 12, the 28 nonpolar capacitor C the 13, the 29 nonpolar capacitor C 14.The 11 resistance R 1, the 12 resistance R 2, the 13 resistance R 4, the 14 resistance R 5.The 9th button S1.
Be connected 49 pin, 50 pin with an end of the 27 nonpolar capacitor C the 12, the 28 nonpolar capacitor C 13 respectively and connect the other end ground connection of the 27 nonpolar capacitor C the 12, the 28 nonpolar capacitor C 13 in the first crystal oscillator Y1 two ends with main control chip U1.One end of the 25 nonpolar capacitor C the 7, the 26 nonpolar capacitor C 8 and the 12 resistance R 2 is connected with main control chip 24 pin, C7, C8, R2 other end ground connection.One end ground connection of the 11 resistance R 1, the other end of the 11 resistance R 1 is connected with main control chip 23 pin, the 13 resistance R 4 one termination VCC, the other end of the 13 resistance R 4 and an end, the 29 nonpolar capacitor C 14 1 ends of the 9th button S1 are connected 9 pin and are connected with main control chip U1, C14 other end ground connection, one end of another termination the 14 resistance R 5 of button S1, R5 other end ground connection; 1 pin of contact pin ICSP1 is connected with 9 pin of main control chip U1,2 pin of contact pin ICSP1 meet VCC, the 3 pin ground connection of contact pin ICSP1, and 4 pin of contact pin ICSP1 are connected with 20 pin of main control chip U1,5 pin of contact pin ICSP1 are connected with 19 pin of main control chip U1, and 5 pin of contact pin ICSP1 and 6 foot rests are empty.
Power supply stabilization circuit comprises the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 and ends of the earth property capacitor C 2.One end of the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 is connected positive terminal and is connected with VCC with polar capacitor C2.The other end of the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 and the minus earth of polar capacitor C2.
Beneficial effect: the invention provides the crucible oven experimental enviroment that meets the GB requirement fully, i.e. temperature control and heat insulation effect surpass the GB testing requirements.Adopt the high-speed a/d converting system to compare the low register of sampling rate, obtain more accurate spontaneous ignition temperature of liquid chemical point, improved simultaneously the accuracy of ignition delay time.By thermopair Real Time Monitoring flask interior temperature variation, and the real-time Transmission current temperature value makes up temperature-time curve to host computer.By the beginning of visible light sensor array perception spontaneous combustion, accurately the spontaneous combustion start time is determined in timing.After spontaneous combustion finished, data processing software calculated the self-ignition temperature of this sample and ignition lag and derived data automatically to the respective stored document.The error of measurement result will reduce greatly in this process, measure efficient and also improve a lot.
Description of drawings
Fig. 1 is system framework figure of the present invention;
Fig. 2 is crucible oven cut-away view of the present invention;
Fig. 3 is overall framework synoptic diagram of the present invention;
Fig. 4 is the power circuit diagram of micro control system of the present invention;
Fig. 5 is operating ambient temperature testing circuit figure of the present invention;
Fig. 6 is the key circuit figure of micro control system of the present invention;
Fig. 7 is the LED display circuit figure of micro control system of the present invention;
Fig. 8 is the serial communication circuit figure of micro control system of the present invention and host computer;
Fig. 9 is the accurate A/D modular converter circuit diagram of micro control system of the present invention;
Figure 10 is the conventional A/D modular converter circuit diagram of micro control system of the present invention;
Figure 11 is visible light sensor array circuit figure of the present invention;
Figure 12 is the sensor placement figure of visible light sensor array of the present invention;
Figure 13 is the connection circuit figure of micro control system of the present invention;
Figure 14 is all Power supply pin mu balanced circuits of the present invention.
Embodiment
Provide embodiments of the invention below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail.
As shown in Figure 1 and Figure 2, this device comprises temperature control of pot furnace system, analog to digital conversion circuit, host computer disposal system.The temperature control of pot furnace system comprises crucible oven and temperature controller, analog to digital conversion circuit comprises A/D change-over circuit take microcontroller as core, power circuit, key circuit, visible light sensor array, telecommunication circuit, LED display circuit etc., the host computer disposal system is PC, crucible oven adopts the ceramic fiber insulation material, take resistance wire as heating element, crucible cover 1 left-right symmetric is divided into two parts, middle perforate, and the aperture is decided according to the aperture of putting into flask.After the flask neck clamped, the crucible bell was put into crucible oven together with flask.After flask was put into crucible oven, right-angled glass conduit 5 and temperature thermocouple T put into flask interior, and temperature thermocouple T and grass tube 5 all are fixed on the crucible cover 1.The flask periphery is evenly wrapped up by aluminium foil, and simultaneously in flask neck bottom, A is wrapped up with aluminium foil respectively in the outside of flask middle part and bottom, B, and three K type thermocouples of C, the lead-in wire of these three thermopairs is drawn from the groove of crucible cover 1 bottom.Visible light sensor array 3 is arranged on iron stand 2, and the visible light sensor array can be adjusted angle flexibly, and iron stand 2 is placed on the crucible bell 1, guarantees that simultaneously the hole that visible light sensor array 3 can see through on the crucible cover monitors the flask interior situation.Temperature-control heat couple D is connected on Fig. 1 temperature controller among Fig. 2, and as temperature controlled foundation, D is arranged in crucible oven madial wall centre position.The simultaneous temperature controller passes to the temperature value of thermopair D in the PC by the RS485 interface.T, A, B, the simulating signal that four thermopairs of C produce is carried out digital-to-analog conversion with the simulating signal of baroceptor by analog to digital conversion circuit among Fig. 1, and the digital signal after the conversion passes in the PC by serial ports.
Visible light sensor array 3 is for to consist of photosensitive array by five visible light sensors.Visible light sensor is mainly responsive to visible light, by regulating inner adjustable resistance and adopting epoxide resin nano packaging sensitization part, can eliminate infrared ray and ultraviolet ray to the impact of sensor devices, reaches the effect of similar human eye.In dark surrounds, catch the visible light that occurs, send out simultaneously corresponding electric signal to microcontroller.By experiment the iron stand clip be arranged in face crucible cover 1 perforate directly over suitable distance.
As shown in Figure 3, the A/D change-over circuit becomes digital signal with analog signal conversion, and digital signal passes to the PC storage through microcontroller and telecommunication circuit afterwards, and these data-signals show by the LED display circuit simultaneously.Power circuit provides power supply for the microcontroller operating circuit.Key circuit is as the action of outside input control microcontroller.Then the signal that the visible light sensor array produces at first passes to the PC storage by telecommunication circuit through the processing of microcontroller.Temperature controller is controlled the temperature of crucible oven by temperature-control heat couple, and the temperature that crucible oven is current passes to PC by the RS485 interface simultaneously.
As shown in Figure 4; the power circuit part; it has the function of voltage transitions; be converted to system's required voltage output behind the high voltage input process voltage stabilizing chip with the outside input; and power circuit has the part defencive function; stop when externally input voltage is not normal supplying induced current to control circuit, protect whole analog to digital conversion circuit not suffer damage.Power circuit comprises power interface J2; standby power supply interface J1; self-lock switch S2; overcurrent protective switch F1; the first voltage stabilizing diode D13; the first diode D10; the second diode D11; the second triode D12; the first polar capacitor C30; the second polar capacitor C32; the 3rd polar capacitor C34; quadripolarity capacitor C 35; the first nonpolar capacitor C 31; the second nonpolar capacitor C 33; the 3rd nonpolar capacitor C 36; the 4th nonpolar capacitor C 37; the first light emitting diode D14; the second light emitting diode D15; the 3rd light emitting diode D16, the first resistance R 9; the second resistance R 10; the 3rd resistance R 11; the 4th resistance R 12.
1 pin of J2 connects 2 pin of self-lock switch S2, and 2,3 pin of J2 also connect rear even 5 pin of S2.1 pin of S2 connects the anode of the 3rd diode D12, the 6 pin ground connection of S2, and 3,4 pin of S2 are unsettled.The negative electrode of D12 is connected to the end of overcurrent protective switch F1; the other end of F1 is connected to the negative electrode of the first diode D10, the anode of the first polar capacitor C30, the negative electrode of the first voltage stabilizing diode D13, an end of the first nonpolar capacitor C 31 and the input end of voltage stabilizing chip U5; the U5 output terminal connects anode, the negative electrode of the 3rd diode D11, the positive pole of the second polar capacitor C32, the second nonpolar capacitor C 33 1 ends of the second diode D10 two; the first resistance R 9 one ends and VCC8 end; the other end of R9 is connected to the positive pole of the first light emitting diode D14, D14 minus earth.The other end of the earth terminal of the other end of the negative pole of the positive pole of voltage stabilizing diode D13, the first polar capacitor C30, the first nonpolar capacitor C 31, voltage stabilizing chip U5, the negative pole of the second polar capacitor C32, the second nonpolar capacitor C 33 and 2 pin of spare interface J1 are ground connection all.1 pin of spare interface J1 connects the positive pole of D11, the output terminal of voltage stabilizing chip U5 is received voltage stabilizing chip U6 input interface, the U6 output terminal is connected with the positive pole of the 3rd polar capacitor C34, an end of the 3rd nonpolar capacitor C 36 and an end of the second resistance R 10, the R10 other end is received the positive pole of the second light emitting diode D15,1 pin of voltage stabilizing chip U5 chip, the negative pole of the 3rd polar capacitor C34, the other end of the 3rd nonpolar capacitor C 36 and the minus earth of the second light emitting diode D15.The U6 output terminal is connected with voltage stabilizing chip U7 input end, the U7 output terminal with to the positive pole of quadripolarity capacitor C 35, an end of the 4th nonpolar capacitor C 37 and an end of the 3rd resistance R 11, the R11 other end is received the positive pole of the 3rd light emitting diode D16,1 interface of voltage stabilizing chip U7, the positive pole of quadripolarity capacitor C 35, the other end of the 4th nonpolar capacitor C 37, the minus earth of the 3rd light emitting diode D16.Power supply ground end links to each other by the 4th resistance R 12 with digital power ground end.
As shown in Figure 5, temperature sensing circuit, it has the environment temperature measuring ability, temperature sensor by chip self will install residing environment temperature and output to microcontroller by digital signal, be ultimately delivered to PC, related warning circuit of while, monitoring environment temperature.Temperature sensing circuit comprises the 5th resistance R 13, the 6th resistance R 14, the five polar capacitor C38, the 5th nonpolar capacitor C 39, thermometric chip U8.The 5th resistance R 13, the 6th resistance R 14 1 ends are connected to power supply VCC3.3,1 pin of the 5th resistance R 13 another termination U8,2 pin of the 6th resistance R 14 another termination thermometric chip U8.4 pin, 5 pin, 6 pin, the 7 pin ground of thermometric chip U8,8 pin meet power supply VCC3.3.1 pin of thermometric chip U8 connects 47 pin of main control chip U1 simultaneously, 2 pin of thermometric chip U8 connect 46 pin of main control chip U1 simultaneously.
As shown in Figure 6, the key circuit part, it has one or more button, is used for to the control system sending controling instruction, and steering order comprises the resetting of starter gear timing, analog to digital conversion circuit, end-of-job etc.Key circuit partly comprises identical the first to the 8th button totally 8 buttons, one of pull-up resistor JP1.All eight button one ends are connected with 2 pin to 9 pin of pull-up resistor JP1,79 pin, 80 pin, 78 pin, 1 pin, 53 pin, 52 pin, 14 pin on the main control chip and the pin of being connected respectively, and the other end of eight buttons is ground connection all.
Shown in Fig. 7 belonged to, the LED display circuit partly comprised the 4th light emitting diode D17, the 5th light emitting diode D18, the 6th light emitting diode D19, the 7th light emitting diode D20, the 8th light emitting diode D21, the 9th light emitting diode D22, the tenth light emitting diode D23, the 11 light emitting diode D24.The first exclusion R15, the second exclusion R16.The whole ground connection of the negative electrode of eight light emitting diodes, light emitting diode D17, light emitting diode D18, the 6th light emitting diode D19, the 7th light emitting diode D20 respectively with 2 pin of the first exclusion R15,4 pin, 6 pin, 8 pin connect, the 8th light emitting diode D21, the 9th light emitting diode D22, the tenth light emitting diode D23, the 11 light emitting diode D24 respectively with 2 pin of the second exclusion R16,4 pin, 6 pin, 8 pin connect, 1 pin of the first exclusion R15,3 pin, 5 pin, 7 pin respectively with 61 pin of main control chip, 62 pin, 63 pin, 66 pin connect, the second exclusion R16 respectively with 67 pin of main control chip, 68 pin, 69 pin, 54 pin connect.
As shown in Figure 8, the telecommunication circuit part, it has the function of communicating by letter with host computer, the digital signal after each sensors A/D conversion can be sent to host computer, do further processing and demonstration, thereby needing in the spontaneous ignition temperature of liquid chemical test to obtain the parameter measured.Telecommunication circuit partly comprises the 6th nonpolar capacitor C 40, the 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, the 9th nonpolar capacitor C 43, the tenth nonpolar capacitor C 44,16 pin level transferring chip U10,11 needle serial port USART1.
One end of the 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, the tenth nonpolar capacitor C 44 links to each other with 16 pin, 2 pin, 6 pin of level U10 respectively, and the other end of the 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, the tenth nonpolar capacitor C 44 is connected with 15 pin of level transferring chip U10 and ground connection.The 6th capacitor C 40 1 ends connect 1 pin of level transferring chip U10, and the other end connects 3 pin of level transferring chip U10.The 9th electric capacity 43 1 ends connect level transferring chip 4 pins, and the other end connects its 5 pin.13 pin of level transferring chip U10,14 pin are connected with 3 pin, 2 pin of serial ports USART1 respectively.5 pin of serial ports USART1,10 pin, 11 pin ground connection, 16 pin of level transferring chip U10 connect power supply, 11 of level transferring chip U10 is connected with 41 pin of main control chip, 12 of level transferring chip U10 is connected with 42 pin of main control chip, and 7 pin of 1 pin of serial ports USART1,4 pin, 7 pin, 8 pin, 9 pin and level transferring chip U10,8 pin, 9 pin, 10 foot rests are empty.
Such as Fig. 9, A/D change-over circuit shown in Figure 10, it has the function that analog signal conversion is become digital signal, can become corresponding digital signal to deliver to microcontroller the analog signal conversion of all sensors of this device and host computer is done further processing.Fig. 9 is described to be 16 or higher A/D change-over circuit, and modulus conversion chip is equipped with accurate reference voltage source, and input end has added filtering circuit and the track to track amplifier carries out the signal processing.This high precision analogue change-over circuit improves sampling precision as the simulating signal sampling of flask interior thermopair T.Figure 10 is described to be 12 A/D change-over circuits, adopts conventional filtering circuit to process input signal, gathers A, B, C thermopair value, weighs crucible oven closed test environment and whether meets the GB requirement.
Accurate A/D analog to digital conversion circuit, specifically comprise three master chip U2, U3, U4, magnetic bead FB1, sextupole capacitor C 16, the 7th polar capacitor C19, the 11 nonpolar capacitor C the 17, the 12 nonpolar capacitor C the 18, the 13 nonpolar capacitor C the 15, the 14 nonpolar capacitor C the 21, the 15 nonpolar capacitor C 20, the second voltage stabilizing diode D1, the 7th resistance R 6.
2 pin of U2 are connected with the end of the positive pole of sextupole capacitor C 16, the 11 nonpolar capacitor C 17 1 ends and magnetic bead FB1, another termination of magnetic bead FB1 VCC.The other end ground connection of the other end of sextupole capacitor C 16 and the 11 nonpolar capacitor C 17.6 pin of U2 are connected with an end of the 12 nonpolar capacitor C 18,1 pin of U3.The other end ground connection of the 12 nonpolar capacitor C 18,8 pin of U3 are connected with power supply with an end of the 13 nonpolar capacitor C 15, the other end ground connection of the 13 nonpolar capacitor C 15, the 4 pin ground connection of U3,5 pin of U3 are connected with 10 pin of main control chip U1,6 pin of U3 are connected with 7 pin of main control chip U1,7 pin of U3 are connected with 6 pin of main control chip U1,1 pin of outer input interface P5 is connected with the end of the negative electrode of the second voltage stabilizing diode D1 with the 7th resistance R 6, external interface P5 and the second voltage stabilizing two utmost point D1 other end ground connection.One end of the 7th resistance R 6 another termination the 14 nonpolar capacitor C 21 and 3 pin of U4, the other end ground connection of the 14 nonpolar capacitor C 21,6 pin of U4 are connected with 2 pin of 2 pin of U4, U3.7 pin of U4 are connected with power supply with an end of the positive pole of the 7th polar capacitor C19, the 15 nonpolar capacitor C 20, the other end ground connection of the negative pole of the 7th polar capacitor C19 and the 15 nonpolar capacitor C 20, and the 4 pin ground connection of U4, all the other pins are built on stilts among the U2U3U4.
Conventional A/D analog to digital conversion circuit specifically comprises the 3rd voltage stabilizing diode D2, the 4th voltage stabilizing diode D3, the 5th voltage stabilizing diode D4, the 6th voltage stabilizing diode D5, the 7th voltage stabilizing diode D6, the 8th voltage stabilizing diode D7, the 9th voltage stabilizing diode D8, the tenth voltage stabilizing diode D9.The nonpolar capacitor C of the 16 nonpolar capacitor C 22, the 17 23, the 18 nonpolar capacitor C 24, the nonpolar capacitor C of the 19 nonpolar capacitor C 25, the 20 26, the 21 nonpolar capacitor C 27, the 22 nonpolar capacitor C 28, the 23 nonpolar capacitor C 29.The 3rd exclusion R11, wiring slot P2.The 3rd voltage stabilizing diode D2, the 4th voltage stabilizing diode D3, the 5th voltage stabilizing diode D4, the 6th voltage stabilizing diode D5, the 7th voltage stabilizing diode D6, the 8th voltage stabilizing diode D7, the 9th voltage stabilizing diode D8, the negative pole of the tenth voltage stabilizing diode D9 respectively with 10 pin of wiring slot P2,9 pin, 8 pin, 7 pin, 6 pin, 5 pin, 4 pin, 1 pin of 3 pin and the 3rd exclusion R11,2 pin, 3 pin, 4 pin, 5 pin, 6 pin, 7 pin, 8 pin connect, 1 pin of wiring slot P2,2 pin ground connection, the 16 nonpolar capacitor C 22, the 17 nonpolar capacitor C 23, the 18 nonpolar capacitor C 24, the 19 nonpolar capacitor C 25, the 20 nonpolar capacitor C 26, the 21 nonpolar capacitor C 27, the 22 nonpolar capacitor C 28, the 23 nonpolar capacitor C 29 respectively with 9 pin of R11,10 pin, 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 17 pin of 16 pin and main control chip U1,16 pin, 15 pin, 21 pin, 22 pin, 27 pin, 28 pin, 29 pin connect, and the positive pole of diode and the other end of electric capacity be ground connection all.
As shown in figure 11, the visible light sensor array consists of circular photosensitive array by five visible light sensors.Visible light sensor is mainly responsive to visible light, by regulating inner adjustable resistance and adopting epoxide resin nano packaging sensitization part, can eliminate infrared ray and ultraviolet ray to the impact of sensor devices, reaches the effect of similar human eye.In dark surrounds, catch the visible light that occurs, send out simultaneously corresponding electric signal to microcontroller.The visible light sensor array by experiment the iron stand fixture layout in the suitable distance that faces directly over crucible cover 2 perforates.
The visible light sensor array is that five identical circuit comprise 10 resistance, 5 rheostats, 5 visible light sensors, 5 electric capacity, wiring slot P9, wiring slot P10.
The 8th resistance R 25 1 ends connect power supply, the other end of the 8th resistance R 25 is connected with 1 pin of visible light sensor U15 power supply, receives 2 pin of interface slot P9 after 2 pin of the 9th resistance R 30 1 ends and the 24 nonpolar capacitor C 62 1 ends, visible light sensor U15 connect.4 pin of visible light sensor U15 are connected with the pin that the first slide rheostat R35 interim pins is connected with R35 in the pin, slide rheostat R35 is left a pin ground connection, ground connection after the 24 nonpolar capacitor C 62 other end ground connection, 3 pin of visible light sensor U15 power supply are connected with the other end of the 9th resistance R 30.
The tenth resistance R 26 1 ends connect power supply, the other end of the tenth resistance R 26 is connected with 1 pin of visible light sensor U16 power supply, receives 1 pin of interface slot P9 after 2 pin of the 11 resistance R 31 1 ends and the 25 nonpolar capacitor C 63 1 ends, visible light sensor U16 connect.4 pin of visible light sensor U16 are connected with the pin that the second slide rheostat R36 interim pins is connected with R36 in the pin, slide rheostat R36 is left a pin ground connection, ground connection after the 25 nonpolar capacitor C 63 other end ground connection, 3 pin of visible light sensor U16 power supply are connected with the other end of the 11 resistance R 31.
The 12 resistance R 22 1 ends connect power supply, the other end of the 12 resistance R 22 is connected with 1 pin of visible light sensor U12 power supply, receives 5 pin of interface slot P9 after 2 pin of the 13 resistance R 27 1 ends and the 26 nonpolar capacitor C 59 1 ends, visible light sensor U12 connect.4 pin of visible light sensor U12 are connected with the pin that the 3rd slide rheostat R32 interim pins is connected with R32 in the pin, slide rheostat R32 is left a pin ground connection, ground connection after the other end ground connection of the 26 nonpolar capacitor C 59,3 pin of visible light sensor U12 power supply are connected with the other end of the 13 resistance R 32.
The 14 resistance R 23 1 ends connect power supply, the other end of the 14 resistance R 23 is connected with 1 pin of visible light sensor U13 power supply, receives 4 pin of interface slot P9 after 2 pin of the 15 resistance R 28 1 ends and the 27 nonpolar capacitor C 60 1 ends, visible light sensor U13 connect.4 pin of visible light sensor U13 are connected with the pin that the 4th slide rheostat R33 interim pins is connected with R33 in the pin, slide rheostat R33 is left a pin ground connection, ground connection after the 27 nonpolar capacitor C 60 other end ground connection, 3 pin of visible light sensor U13 power supply are connected with the other end of the 15 resistance R 28.
The 16 resistance R 24 1 ends connect power supply, the other end of the 16 resistance R 24 is connected with 1 pin of visible light sensor U14 power supply, receives 3 pin of interface slot P9 after 2 pin of the 17 resistance R 29 1 ends and the 28 nonpolar capacitor C 61 1 ends, visible light sensor U14 connect.4 pin of visible light sensor U14 are connected with the pin that the 5th slide rheostat R34 interim pins is connected with R34 in the pin, slide rheostat R34 is left a pin ground connection, ground connection after the other end ground connection of the 28 nonpolar capacitor C 61,3 pin of visible light sensor U14 power supply are connected with the other end of the 17 resistance R 29.
1 pin of wiring slot P10 connects power supply, the 2 pin ground connection of wiring slot P10.
As shown in figure 12, warning circuit comprises the first hummer LS1, the first triode Q1, the tenth resistance R 3.The first triode Q1 emitter is connected with VCC, and the first triode Q1 base stage is connected with an end of the tenth resistance, and the first triode Q1 collector is connected the minus earth of hummer with the positive pole of hummer.
As shown in figure 13, the microcontroller part, it has logic control and arithmetic capability, can accept to control the control signal of button, the input signal of pick-up transducers also carries out analog to digital conversion, digital signal after the conversion is sent to host computer, and can control the LED indication when the duty of prepass, and the control warning circuit is reminded the work at present emergency circumstance.Specifically comprise main control chip U1, contact pin ICSP1, the first crystal oscillator Y1, the 25 nonpolar capacitor C the 7, the 26 nonpolar capacitor C the 8, the 27 nonpolar capacitor C the 12, the 28 nonpolar capacitor C the 13, the 29 nonpolar capacitor C 14.The 11 resistance R 1, the 12 resistance R 2, the 13 resistance R 4, the 14 resistance R 5.The 9th button S1.
Be connected 49 pin, 50 pin with an end of the 27 nonpolar capacitor C the 12, the 28 nonpolar capacitor C 13 respectively and connect the other end ground connection of the 27 nonpolar capacitor C the 12, the 28 nonpolar capacitor C 13 in the first crystal oscillator Y1 two ends with main control chip U1.One end of the 25 nonpolar capacitor C the 7, the 26 nonpolar capacitor C 8 and the 12 resistance R 2 is connected with main control chip 24 pin, C7, C8, R2 other end ground connection.One end ground connection of the 11 resistance R 1, the other end of the 11 resistance R 1 is connected with main control chip 23 pin, the 13 resistance R 4 one termination VCC, the other end of the 13 resistance R 4 and an end, the 29 nonpolar capacitor C 14 1 ends of the 9th button S1 are connected 9 pin and are connected with main control chip U1, C14 other end ground connection, one end of another termination the 14 resistance R 5 of button S1, R5 other end ground connection; 1 pin of contact pin ICSP1 is connected with 9 pin of main control chip U1,2 pin of contact pin ICSP1 meet VCC, the 3 pin ground connection of contact pin ICSP1, and 4 pin of contact pin ICSP1 are connected with 20 pin of main control chip U1,5 pin of contact pin ICSP1 are connected with 19 pin of main control chip U1, and 5 pin of contact pin ICSP1 and 6 foot rests are empty.
Shown in Figure 14, power supply stabilization circuit comprises the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 and ends of the earth property capacitor C 2.One end of the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 is connected positive terminal and is connected with VCC with polar capacitor C2.The other end of the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 and the minus earth of polar capacitor C2.
When carrying out spontaneous ignition temperature of liquid chemical mensuration, at first the crucible oven temperature is adjusted to suitable temperature by temperature controller, this temperature keeps the temperature constant that is delayed to of a period of time normally near the self-ignition temperature of fluid to be measured.Observe thermopair A, the indicated temperature value of B, C, with reference among the GB GB/T 21860-2008 to the requirement of temperature homogeneity, carry out next step test if meet the requirements.Get the 100ul test specimen with syringe, be injected into flask by grass tube, touch simultaneously the button on the analog to digital conversion circuit, do an initial mark at the time shaft of system temperature collection.By the supervision of visible light sensor array, when the burning light occurring, array is sent electric signal to microcontroller under dark surrounds, on time shaft, do again a time mark, moments later stop analog to digital conversion circuit, blow the flask interior residue with heat gun, prepare next group sample.After all data are pooled in the PC 8, be saved in the excel file, data realize temperature-time curve of thermopair T by software programming after being pooled to host computer, and calculate each time point rate of temperature change, select the larger time point mark of rate of change.Calculate from the beginning timing to mistiming of rate of temperature change maximum as ignition lag and show, the indirect labor begins two mistimings with the visible light sensor arrays of indicia as the ignition lag reference.
This device is built the test unit platform on the basis that meets GB GB/T 21860-2008 fully, and has further improved the automaticity of test macro, has improved the degree of accuracy of test findings.By warning circuit, LED display circuit etc. make test process more humane.Process by upper computer software, obtain quickly and efficiently test findings, save data has been saved manpower and materials, has improved efficient.

Claims (1)

1. detection apparatus for liquid chemical product spontaneous combustion temperature, comprise the temperature control of pot furnace system, analog to digital conversion circuit, the host computer disposal system, the temperature control of pot furnace system comprises crucible oven and temperature controller, analog to digital conversion circuit comprises the A/D change-over circuit take microcontroller as core, power circuit, key circuit, the visible light sensor array, telecommunication circuit, the LED display circuit, the host computer disposal system is PC, it is characterized in that: crucible oven adopts the ceramic fiber insulation material, take resistance wire as heating element, the crucible cover left-right symmetric is divided into two parts, middle perforate, match with the aperture of flask in the aperture, right-angled glass conduit and temperature thermocouple T place flask interior, temperature thermocouple T and grass tube all are fixed on the crucible cover, the flask periphery is evenly wrapped up by aluminium foil, in flask neck bottom, A is wrapped up with aluminium foil respectively in the outside of flask middle part and bottom, B, three K type thermocouples of C, the lead-in wire of these three thermopairs is drawn from the groove of crucible cover bottom, the visible light sensor array is arranged on the iron stand, the visible light sensor array can be adjusted angle flexibly, iron stand is placed on crucible oven and covers, guarantee that simultaneously the hole that the visible light sensor array can see through on the crucible cover monitors the flask interior situation, middle temperature-control heat couple D is connected on the temperature controller, as temperature controlled foundation, D is arranged in crucible oven madial wall centre position, the simultaneous temperature controller passes to the temperature value of thermopair D in the PC by the RS485 interface, T, A, B, the simulating signal that four thermopairs of C produce is carried out digital-to-analog conversion with the simulating signal of baroceptor by analog to digital conversion circuit, and the digital signal after the conversion passes in the PC by serial ports;
The visible light sensor array is for to consist of photosensitive array by five visible light sensors, by experiment the iron stand clip be arranged in face crucible cover 1 perforate directly over suitable distance;
The A/D change-over circuit becomes digital signal with analog signal conversion, digital signal passes to the PC storage through microcontroller and telecommunication circuit afterwards, these data-signals show by the LED display circuit simultaneously, power circuit provides power supply for the microcontroller operating circuit, key circuit is as the action of outside input control microcontroller, the signal that the visible light sensor array produces, at first then pass to the PC storage by telecommunication circuit through the processing of microcontroller, temperature controller is controlled the temperature of crucible oven by temperature-control heat couple, and the temperature that crucible oven is current passes to PC by the RS485 interface simultaneously;
Power circuit part divides and comprises power interface J2, standby power supply interface J1, self-lock switch S2, overcurrent protective switch F1, the first voltage stabilizing diode D13, the first diode D10, the second diode D11, the second triode D12, the first polar capacitor C30, the second polar capacitor C32, the 3rd polar capacitor C34, quadripolarity capacitor C 35, the first nonpolar capacitor C 31, the second nonpolar capacitor C 33, the 3rd nonpolar capacitor C 36, the 4th nonpolar capacitor C 37, the first light emitting diode D14, the second light emitting diode D15, the 3rd light emitting diode D16, the first resistance R 9, the second resistance R 10, the 3rd resistance R 11, the 4th resistance R 12, power interface J2 is three-pin socket, 1 pin of J2 connects 2 pin of self-lock switch S2,2 of J2,3 pin also connect rear even 5 pin of S2,1 pin of S2 connects the anode of the 3rd diode D12, the 6 pin ground connection of S2,3 of S2,4 pin are unsettled, the negative electrode of D12 is connected to the end of overcurrent protective switch F1, the other end of F1 is connected to the negative electrode of the first diode D10, the anode of the first polar capacitor C30, the negative electrode of the first voltage stabilizing diode D13, the input end of one end of the first nonpolar capacitor C 31 and voltage stabilizing chip U5, the U5 output terminal connects the anode of the second diode D10 two, the negative electrode of the 3rd diode D11, the positive pole of the second polar capacitor C32, the second nonpolar capacitor C 33 1 ends, the first resistance R 9 one ends and VCC8 end, the other end of R9 is connected to the positive pole of the first light emitting diode D14, the D14 minus earth, the positive pole of voltage stabilizing diode D13, the negative pole of the first polar capacitor C30, the other end of the first nonpolar capacitor C 31, the earth terminal of voltage stabilizing chip U5, the negative pole of the second polar capacitor C32,2 pin of the other end of the second nonpolar capacitor C 33 and spare interface J1 are ground connection all, 1 pin of spare interface J1 connects the positive pole of D11, the output terminal of voltage stabilizing chip U5 is received voltage stabilizing chip U6 input interface, the positive pole of U6 output terminal and the 3rd polar capacitor C34, one end of one end of the 3rd nonpolar capacitor C 36 and the second resistance R 10 connects, the R10 other end is received the positive pole of the second light emitting diode D15,1 pin of voltage stabilizing chip U5 chip, the negative pole of the 3rd polar capacitor C34, the minus earth of the other end of the 3rd nonpolar capacitor C 36 and the second light emitting diode D15, the U6 output terminal is connected with voltage stabilizing chip U7 input end, the U7 output terminal with to the positive pole of quadripolarity capacitor C 35, one end of one end of the 4th nonpolar capacitor C 37 and the 3rd resistance R 11, the R11 other end is received the positive pole of the 3rd light emitting diode D16,1 interface of voltage stabilizing chip U7, the positive pole of quadripolarity capacitor C 35, the other end of the 4th nonpolar capacitor C 37, the minus earth of the 3rd light emitting diode D16, power supply ground end links to each other by the 4th resistance R 12 with digital power ground end;
Temperature sensing circuit comprises the 5th resistance R 13, the 6th resistance R 14, the 5th polar capacitor C38, the 5th nonpolar capacitor C 39, thermometric chip U8, the 5th resistance R 13, the 6th resistance R 14 1 ends are connected to power supply VCC3.3,1 pin of the 5th resistance R 13 another termination U8,2 pin of the 6th resistance R 14 another termination thermometric chip U8,4 pin, 5 pin, 6 pin, the 7 pin ground of thermometric chip U8,8 pin meet power supply VCC3.3, and 1 pin of thermometric chip U8 connects 47 pin of main control chip U1 simultaneously, 2 pin of thermometric chip U8 connect 46 pin of main control chip U1 simultaneously;
Key circuit partly comprises identical the first to the 8th button totally 8 buttons, one of pull-up resistor JP1, all eight button one ends are connected with 2 pin to 9 pin of pull-up resistor JP1,79 pin, 80 pin, 78 pin, 1 pin, 53 pin, 52 pin, 14 pin on the main control chip and the pin of being connected respectively, and the other end of eight buttons is ground connection all;
The LED display circuit partly comprises the 4th light emitting diode D17, the 5th light emitting diode D18, the 6th light emitting diode D19, the 7th light emitting diode D20, the 8th light emitting diode D21, the 9th light emitting diode D22, the tenth light emitting diode D23, the 11 light emitting diode D24, the first exclusion R15, the second exclusion R16, the whole ground connection of the negative electrode of eight light emitting diodes, light emitting diode D17, light emitting diode D18, the 6th light emitting diode D19, the 7th light emitting diode D20 respectively with 2 pin of the first exclusion R15,4 pin, 6 pin, 8 pin connect, the 8th light emitting diode D21, the 9th light emitting diode D22, the tenth light emitting diode D23, the 11 light emitting diode D24 respectively with 2 pin of the second exclusion R16,4 pin, 6 pin, 8 pin connect, 1 pin of the first exclusion R15,3 pin, 5 pin, 7 pin respectively with 61 pin of main control chip, 62 pin, 63 pin, 66 pin connect, the second exclusion R16 respectively with 67 pin of main control chip, 68 pin, 69 pin, 54 pin connect;
Telecommunication circuit partly comprises the 6th nonpolar capacitor C 40, the 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, the 9th nonpolar capacitor C 43, the tenth nonpolar capacitor C 44,16 pin level transferring chip U10,11 needle serial port USART1;
The 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, one end of the tenth nonpolar capacitor C 44 respectively with 16 pin of level U10,2 pin, 6 pin link to each other, the 7th nonpolar capacitor C 41, the 8th nonpolar capacitor C 42, the other end of the tenth nonpolar capacitor C 44 is connected with 15 pin of level transferring chip U10 and ground connection, the 6th capacitor C 40 1 ends connect 1 pin of level transferring chip U10, the other end connects 3 pin of level transferring chip U10, the 9th electric capacity 43 1 ends connect level transferring chip 4 pins, the other end connects its 5 pin, 13 pin of level transferring chip U10,14 pin respectively with 3 pin of serial ports USART1,2 pin connect, 5 pin of serial ports USART1,10 pin, 11 pin ground connection, 16 pin of level transferring chip U10 connect power supply, 11 of level transferring chip U10 is connected with 41 pin of main control chip, 12 of level transferring chip U10 is connected 1 pin of serial ports USART1 with 42 pin of main control chip, 4 pin, 7 pin, 8 pin, 7 pin of 9 pin and level transferring chip U10,8 pin, 9 pin, 10 foot rests are empty;
Accurate A/D analog to digital conversion circuit comprises three master chip U2, U3, U4, magnetic bead FB1, sextupole capacitor C 16, the 7th polar capacitor C19, the 11 nonpolar capacitor C the 17, the 12 nonpolar capacitor C the 18, the 13 nonpolar capacitor C the 15, the 14 nonpolar capacitor C the 21, the 15 nonpolar capacitor C 20, the second voltage stabilizing diode D1, the 7th resistance R 6;
2 pin of U2 and the positive pole of sextupole capacitor C 16, the end of the 11 nonpolar capacitor C 17 1 ends and magnetic bead FB1 connects, another termination of magnetic bead FB1 VCC, the other end ground connection of the other end of sextupole capacitor C 16 and the 11 nonpolar capacitor C 17,6 pin of U2 and an end of the 12 nonpolar capacitor C 18,1 pin of U3 connects, the other end ground connection of the 12 nonpolar capacitor C 18,8 pin of U3 are connected with power supply with an end of the 13 nonpolar capacitor C 15, the other end ground connection of the 13 nonpolar capacitor C 15, the 4 pin ground connection of U3,5 pin of U3 are connected with 10 pin of main control chip U1,6 pin of U3 are connected with 7 pin of main control chip U1,7 pin of U3 are connected with 6 pin of main control chip U1,1 pin of outer input interface P5 is connected with the end of the negative electrode of the second voltage stabilizing diode D1 with the 7th resistance R 6, external interface P5 and the second voltage stabilizing two utmost point D1 other end ground connection, one end of the 7th resistance R 6 another termination the 14 nonpolar capacitor C 21 and 3 pin of U4, the other end ground connection of the 14 nonpolar capacitor C 21,6 pin of U4 and 2 pin of U4,2 pin of U3 connect, 7 pin of U4 and the positive pole of the 7th polar capacitor C19, one end of the 15 nonpolar capacitor C 20 is connected with power supply, the other end ground connection of the negative pole of the 7th polar capacitor C19 and the 15 nonpolar capacitor C 20, the 4 pin ground connection of U4, all the other pins are built on stilts among the U2U3U4;
Conventional A/D analog to digital conversion circuit comprises the 3rd voltage stabilizing diode D2, the 4th voltage stabilizing diode D3, the 5th voltage stabilizing diode D4, the 6th voltage stabilizing diode D5, the 7th voltage stabilizing diode D6, the 8th voltage stabilizing diode D7, the 9th voltage stabilizing diode D8, the tenth voltage stabilizing diode D9, the 16 nonpolar capacitor C 22, the 17 nonpolar capacitor C 23, the 18 nonpolar capacitor C 24, the 19 nonpolar capacitor C 25, the 20 nonpolar capacitor C 26, the 21 nonpolar capacitor C 27, the 22 nonpolar capacitor C 28, the 23 nonpolar capacitor C 29, the 3rd exclusion R11, wiring slot P2, the 3rd voltage stabilizing diode D2, the 4th voltage stabilizing diode D3, the 5th voltage stabilizing diode D4, the 6th voltage stabilizing diode D5, the 7th voltage stabilizing diode D6, the 8th voltage stabilizing diode D7, the 9th voltage stabilizing diode D8, the negative pole of the tenth voltage stabilizing diode D9 respectively with 10 pin of wiring slot P2,9 pin, 8 pin, 7 pin, 6 pin, 5 pin, 4 pin, 1 pin of 3 pin and the 3rd exclusion R11,2 pin, 3 pin, 4 pin, 5 pin, 6 pin, 7 pin, 8 pin connect, 1 pin of wiring slot P2,2 pin ground connection, the 16 nonpolar capacitor C 22, the 17 nonpolar capacitor C 23, the 18 nonpolar capacitor C 24, the 19 nonpolar capacitor C 25, the 20 nonpolar capacitor C 26, the 21 nonpolar capacitor C 27, the 22 nonpolar capacitor C 28, the 23 nonpolar capacitor C 29 respectively with 9 pin of R11,10 pin, 11 pin, 12 pin, 13 pin, 14 pin, 15 pin, 17 pin of 16 pin and main control chip U1,16 pin, 15 pin, 21 pin, 22 pin, 27 pin, 28 pin, 29 pin connect, and the positive pole of diode and the other end of electric capacity be ground connection all;
The visible light sensor array comprises 10 resistance, 5 rheostats, 5 visible light sensors, 5 electric capacity, wiring slot P9, wiring slot P10;
The 8th resistance R 25 1 ends connect power supply, the other end of the 8th resistance R 25 is connected with 1 pin of visible light sensor U15 power supply, the 9th resistance R 30 1 ends and the 24 nonpolar electric capacity capacitor C 62 1 ends, after connecting, receive on 2 pin of visible light sensor U15 2 pin of interface slot P9,4 pin of visible light sensor U15 are connected with the pin that the first slide rheostat R35 interim pins is connected with R35 in the pin, slide rheostat R35 is left a pin ground connection, ground connection after the 24 nonpolar capacitor C 62 other end ground connection, 3 pin of visible light sensor U15 power supply are connected with the other end of the 9th resistance R 30;
The tenth resistance R 26 1 ends connect power supply, the other end of the tenth resistance R 26 is connected with 1 pin of visible light sensor U16 power supply, the 11 resistance R 31 1 ends and the 25 nonpolar capacitor C 63 1 ends, after connecting, receive on 2 pin of visible light sensor U16 1 pin of interface slot P9,4 pin of visible light sensor U16 are connected with the pin that the second slide rheostat R36 interim pins is connected with R36 in the pin, slide rheostat R36 is left a pin ground connection, ground connection after the 25 nonpolar capacitor C 63 other end ground connection, 3 pin of visible light sensor U16 power supply are connected with the other end of the 11 resistance R 31;
The 12 resistance R 22 1 ends connect power supply, the other end of the 12 resistance R 22 is connected with 1 pin of visible light sensor U12 power supply, the 13 resistance R 27 1 ends and the 26 nonpolar capacitor C 59 1 ends, after connecting, receive on 2 pin of visible light sensor U12 5 pin of interface slot P9,4 pin of visible light sensor U12 are connected with the pin that the 3rd slide rheostat R32 interim pins is connected with R32 in the pin, slide rheostat R32 is left a pin ground connection, ground connection after the other end ground connection of the 26 nonpolar capacitor C 59,3 pin of visible light sensor U12 power supply are connected with the other end of the 13 resistance R 32;
The 14 resistance R 23 1 ends connect power supply, the other end of the 14 resistance R 23 is connected with 1 pin of visible light sensor U13 power supply, the 15 resistance R 28 1 ends and the 27 nonpolar capacitor C 60 1 ends, after connecting, receive on 2 pin of visible light sensor U13 4 pin of interface slot P9,4 pin of visible light sensor U13 are connected with the pin that the 4th slide rheostat R33 interim pins is connected with R33 in the pin, slide rheostat R33 is left a pin ground connection, ground connection after the 27 nonpolar capacitor C 60 other end ground connection, 3 pin of visible light sensor U13 power supply are connected with the other end of the 15 resistance R 28;
The 16 resistance R 24 1 ends connect power supply, the other end of the 16 resistance R 24 is connected with 1 pin of visible light sensor U14 power supply, the 17 resistance R 29 1 ends and the 28 nonpolar capacitor C 61 1 ends, after connecting, receive on 2 pin of visible light sensor U14 3 pin of interface slot P9,4 pin of visible light sensor U14 are connected with the pin that the 5th slide rheostat R34 interim pins is connected with R34 in the pin, slide rheostat R34 is left a pin ground connection, ground connection after the other end ground connection of the 28 nonpolar capacitor C 61,3 pin of visible light sensor U14 power supply are connected with the other end of the 17 resistance R 29;
1 pin of wiring slot P10 connects power supply, the 2 pin ground connection of wiring slot P10;
Warning circuit comprises the first hummer LS1, the first triode Q1, the tenth resistance R 3, the first triode Q1 emitter is connected with VCC3.3, the first triode Q1 base stage is connected with an end of the tenth resistance, and the first triode Q1 collector is connected the minus earth of hummer with the positive pole of hummer;
Microcontroller comprises main control chip U1, contact pin ICSP1, the first crystal oscillator Y1, the 25 nonpolar capacitor C the 7, the 26 nonpolar capacitor C the 8, the 27 nonpolar capacitor C the 12, the 28 nonpolar capacitor C the 13, the 29 nonpolar capacitor C 14, the 11 resistance R 1, the 12 resistance R 2, the 13 resistance R 4, the 14 resistance R 5, the nine button S1;
The first crystal oscillator Y1 two ends respectively with the 27 nonpolar capacitor C 12, one end of the 28 nonpolar capacitor C 13 and 49 pin of main control chip U1,50 pin connect, the 27 nonpolar capacitor C 12, the other end ground connection of the 28 nonpolar capacitor C 13, the 25 nonpolar capacitor C 7, one end of the 26 nonpolar capacitor C 8 and the 12 resistance R 2 is connected with main control chip 24 pin, C7, C8, R2 other end ground connection, one end ground connection of the 11 resistance R 1, the other end of the 11 resistance R 1 is connected with main control chip 23 pin, the 13 resistance R 4 one termination VCC, the end of the other end of the 13 resistance R 4 and the 9th button S1, the 29 nonpolar capacitor C 14 1 ends are connected 9 pin and are connected with main control chip U1, C14 other end ground connection, one end of another termination the 14 resistance R 5 of button S1, R5 other end ground connection; 1 pin of contact pin ICSP1 is connected with 9 pin of main control chip U1,2 pin of contact pin ICSP1 meet VCC, the 3 pin ground connection of contact pin ICSP1, and 4 pin of contact pin ICSP1 are connected with 20 pin of main control chip U1,5 pin of contact pin ICSP1 are connected with 19 pin of main control chip U1, and 5 pin of contact pin ICSP1 and 6 foot rests are empty;
Power supply stabilization circuit comprises the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 and ends of the earth property capacitor C 2, one end of the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 is connected positive terminal and is connected the other end of the 30 nonpolar capacitor C the 1, the 31 nonpolar capacitor C 3 and the minus earth of polar capacitor C2 with VCC with polar capacitor C2.
CN 201110389569 2011-11-30 2011-11-30 Detection apparatus for liquid chemical product spontaneous combustion temperature Expired - Fee Related CN102495097B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101750163A (en) * 2010-01-05 2010-06-23 杭州电子科技大学 Temperature humidity gauge based on MSP 430 singlechip
CN202330321U (en) * 2011-11-30 2012-07-11 杭州量泰科技有限公司 Device for determining spontaneous ignition temperature of liquid chemical

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Publication number Priority date Publication date Assignee Title
EP2035797A4 (en) * 2006-06-03 2013-01-16 Prec Linear Systems Inc Temperature-sensing and transmitting assemblies, programmable temperature sensor units, and methods of making and using them

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101750163A (en) * 2010-01-05 2010-06-23 杭州电子科技大学 Temperature humidity gauge based on MSP 430 singlechip
CN202330321U (en) * 2011-11-30 2012-07-11 杭州量泰科技有限公司 Device for determining spontaneous ignition temperature of liquid chemical

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