CN2100625U - Open-cup flash and fire points automatic tester for petroleum products - Google Patents

Abstract

The utility model discloses an open-cup flash and fire point automatic tester for the petroleum products. The digital display temperature is controlled by a single chip machine. According to two national standards of GB3536-83 or GB267-77, the utility model can automatically control the heating rate via the PID adjusting means, can automatically carry out scanning according to the initial scanning temperature and interval of the standard code and can automatically detect the flash and fire points with the thermal couple heap type detector. The utility model also has more than ten display functions of the automatic diagnosis for the error and fault, such as the operating status display, the automatic display for the flash and fire points, the audible-visual alarm, etc. The temperature measurement error is 0.1% +/-0.5 DEG C.

Description

Open-cup flash and fire points automatic tester for petroleum products

The utility model relates to the open flash point burning-point automatic analyzer of petroleum products, relates in particular to a kind of by micro-processor controlled petroleum products open flash point burning-point automatic analyzer.

Existing naphthaometer adopts heating to carry out table apparatus, is controlled rate of warming and is drawn and sweep the bar operation by manual shift electric furnace voltage, and because of the stimulation of oil smoke to the people, the accuracy of control is not high, use also inconvenient, poor working environment.Its sniffer that detects flash-point adopts ionization ring detector, when draw sweeping the igniting beginning after, the HF voltage of introducing about 600 volts is added on the ionization ring probe.And the right gap of probe had relatively high expectations, the gap is too small, then can produce self discharge, and excesssive gap does not then discharge during scintillation.Needle point must keep clean simultaneously, otherwise can not discharge when scintillation, causes the phenomenon that does not detect flash-point.During measurement, because the ionization ring is very near from pasta, probe very easily is stained with greasy dirt, makes troubles to use, influences flash-point, burning-point measuring accuracy.

The purpose of this utility model is to solve the difficult point of above-mentioned technology; a kind of automatic analyzer by micro-processor controlled open flash point burning-point is provided; comprise control automatically heat up, draw automatically sweep, the automatic monitoring of flash-point burning-point, report to the police automatically, excess temperature is protected automatically, all kinds of automatic fault diagnosis, to improve measuring accuracy.

The purpose of this utility model realizes by following scheme.

The utility model is mainly carried out platform two parts by main control system (comprising+5 volts of stabilized voltage supplys) and heating and is formed.Main control system adopts MCS-51 series monolithic chip 8031, and the chip 8155 of expansion is arranged; The 4K measurement and control program; Temperature, flash-point, burning-point detect display circuit.Main frame has two windows, and left window is four displays 12, gamut displays temperature value, 0.1 ℃ of minimum displayed value.Right window is six displays 11, shows the work at present mode.Displaying contents comprises: initialization finishes; Internal memory is checked, is revised; Flash-point, burning-point setting; Flash-point, burning-point are read; National standard is selected; Working stage; Current heating rate; Draw the state of sweeping; Flash-point, burning-point show and kind of error exception self diagnosis demonstration etc. surplus in the of ten.Main frame comprises that also Standard Selection key 1, function key 2～7, tri-colour LED 8, host power supply make war 9, dial 10.Standard Selection key 1 available GB3536-83 and two kinds of standards of GB267-77.Be the demonstration of heating when tri-colour LED 8 is green, take on a red color and be that flash-point shows when glimmering, be orange and be that burning-point shows during flicker.Dial 10 can carry out internal memory inspection, modification and the setting of expection flash-point.Heating carry out platform by testing table power switch 13, draw and sweep button 14, A.C. voltmeter 15, electric furnace voltage-regulation knob 16, electric furnace 17, Cleveland cup 18, flash-point detector 19, temperature sensor 20, draw bar 21, draw and sweep motor 22 and form.

The temperature message that temperature sensor 20 is introduced changes linear change into through the R/V linear transform circuit, finish move zero point and cushion amplification after, send singlechip chip 8031 to carry out data processing through the A/D conversion, output message send latch, then through decoding, driving, by four displays 12, show current temperature value.Flash-point detector 19 records the flash-point signal, send flash-point through amplification, comparator circuit to the INT1 of singlechip chip 8031 end and interrupt application, after the CPU of singlechip chip 8031 accepts to interrupt application, judge through software, as determining to have recorded the flash-point value, promptly measured signal by P1.6 mouth output flash-point, promote sound light alarming circuit, send sound and light alarm, show the flash-point value by six displays 11 simultaneously.Light is reported to the police and is born by tri-colour LED 8.The control of electric furnace 17 of heating is divided into manually and automatic two kinds.One switch is arranged carrying out the platform rear, when being allocated to when performing, for manual control is heated, the power supply of electric furnace 17 is carried out the former control circuit of platform through heating, by turn voltage-regulation knob 16, changes the average voltage level on the electric furnace.This magnitude of voltage is shown by A.C. voltmeter 15.When switch is allocated to lower gear, for controlling heating mode automatically, singlechip chip 8031 was controlled electric furnace through light activated power thyristor in the pulsewidth mode by the P1.7 mouth and was heated this moment, and its dutycycle can be adjusted between 1/100～1, the voltage duty cycle of the current output of A.C. voltmeter 15 indications this moment.Igniting of the present utility model is drawn and is swept circuit and also be divided into manually and automatic two kinds.Manually and automated manner sweep button 14 and control by drawing.When pressing or At time of eject, can realize drawing the both forward and reverse directions sweep motor 22 and draw and sweep.When drawing when sweeping button 14 and being in ejected position, can draw automatically and sweep, this moment single-chip microcomputer 8031 P1.3 mouth control Driver Circuit, control is drawn and is swept motor and sweep for 22 forward and reverse strokes automatically, thereby has realized that computing machine is to drawing an automatic control of sweeping motor 22.Key scanning of the present utility model and to read dial be to expand the matrix-scanning circuit that the PC mouth forms by the PA mouth that expands chip 8155 to realize.The PA mouth is a line output, and the PC mouth is realized by the dynamic scan circuit that PA mouth and PB mouth are formed that for row input, the data presentation of six displays 11 of working method the PA mouth is that (PA0～PA5), the PB mouth is segment encode output in bit code output.

Flash-point detector 19 of the present utility model adopts thermocouple heap formula flash-point detector, it is by the thermocouple wire of two kinds of pairings, as one one of nickel filament and nisiloy silk alternately series welding be connected together, be continuous " V " word and " V " font that falls, following contact is the A end, and upper contact is the B end.The range of size of thermocouple wire diameter is 0.1～0.8 millimeter.

The utility model is used the PID regulative mode owing to adopt system controlled by computer, has solved the automatic control problem that heats up, and therefore, measurement result is accurate.Owing to adopt thermocouple heap formula flash-point detector, removed high-tension circuit, do not have interference problem, and entire circuit is simple and reliable, handling safety to computing machine.Even this detector is stained with greasy dirt, does not influence detection sensitivity yet, and do not need often to wipe examination.Because the utility model automaticity height can shut window and test, and has alleviated labor intensity of operating personnel, has reduced fume pollution.

Measurement range of the present utility model is: room temperature～400 ℃; Error at measurment: meet the GB3536-83 requirement; Thermometric error: 0.1% ± 0.5 ℃; Environment for use temperature: 5～40 ℃; Supply voltage: 220V ± 10(frequency: 50HZ); Electrical source consumption power: average≤500W.

Description of drawings:

Fig. 1 is a hardware block diagram of the present utility model;

Fig. 2 is motherboard face figure of the present utility model;

Fig. 3 is that the platform structural drawing is carried out in heating of the present utility model;

Fig. 4 is the enlarged drawing of flash-point detector 19.

Below be that the contrast accompanying drawing remarks additionally in conjunction with the utility model.

When the utility model is used to measure, can follow these steps to carry out: 1, oil sample is poured into Cleveland cup 18, light flame.Nickel chromium triangle, nisiloy silk by 0.1 mm dia are formed thermopair detector 19.When measuring flash-point, its A holds near liquid level, and along drawing the track outside lower end arrangement of sweeping flame, counts mm distance from oil level.When scintillation, A holds each contact temperature to raise suddenly, and B holds each contact because less than scintillation, there is the temperature difference in impression between two contacts, has just produced thermoelectrical potential between the loop, positive pulse of Vout end output.On the contrary, if B end temperature is higher than the A end, the then defeated negative pulse of Vout end.

2, open heating execution platform power supply and make war 13, set expection flash-point values, can establish 180 ℃ by dial 10, press function key 2, click function key 7 again and start, six displays of right window banging mode 11 show national standard, click function key 7 again, electric furnace 17 begins to heat.

3, following process will be carried out automatically

When Standard Selection key 1 is in down state, then select the GB3536-83 standard, the programming rate of sample is 14～17 ℃/minute, when 28 ℃ of expection flash-point precontracts, remain 5～6 ℃/minute, begin simultaneously to draw and sweep, 2 ℃ of the every risings of temperature are drawn bar 21 and are swept once by drawing above the pasta.

When Standard Selection key 1 is in the ejection state, what then select is the GB267-77 standard, it is 14～17 ℃/minute that the sample programming rate begins, when temperature reaches preceding 60 ℃ of flash-point of expection, adjust firing rate, can control programming rate when making specimen temperature reach preceding 40 ℃ of flash-point is that per minute raises 4 ± 1 ℃.When specimen temperature reaches preceding 10 ℃ of flash-point of expection, begin to draw and sweep, 2 ℃ of the every risings of temperature are drawn bar 21 and are drawn automatically by the pasta top and sweep once.

When scintillation takes place after, automatically institute is surveyed the locking of flash-point value, show by six displays 11, send the sound and light alarm signal simultaneously.

As also measuring burning-point, then should press function key 5, again by function key 7, then continue to heat up and draw and sweep by former programming rate, when flame catches fire when being no less than for 5 seconds, promptly measure temperature this moment, after the locking, show that by six displays 11 send sound and light alarm simultaneously, fire extinguishing immediately closes the lid.

Do not measure flash-point yet for 20 ℃ if surpass expection flash-point value, this analyzer cuts out electric furnace automatically, and the display reminding symbol.Do not catch fire yet for 100 ℃ if surpass expection flash-point value when surveying burning-point, this analyzer also can cut out electric furnace automatically, and the display reminding symbol.

If the operational mistake of appearance or certain part break down in the instrument course of work, also can close electric furnace automatically, the display reminding symbol, and automatically return to safe condition.

Claims (2)

1, a kind of petroleum products open flash point burning-point automatic analyzer of forming by MCS-51 series monolithic and heating execution platform, this heating is carried out platform by power switch 13, draw and sweep knob 14, A.C. voltmeter 15, voltage-regulation turn-knob 16, electric furnace 17, Cleveland cup 18, flash-point detector 19, temperature sensor 20, draw bar 21, draw and sweep motor 22 compositions, measurement and control host computer is by MCS-51 series monolithic chip 8031, expand chip 8155, the 4K measurement and control program, temperature, flash-point, burning-point detects display circuit and forms, provide host power supply by power switch 9,2-7 is a function key, set expection flash-point value by dial 10, the temperature message of introducing through temperature sensor 20 is sent into monolithic chip 8031 through R/V linear transformation and A/D conversion and is carried out data processing, output message send latch, drive through decoding, show Current Temperatures by four displays 12, thermojunction type flash-point detector 19, record the flash-point signal, through amplifying, comparator circuit sends flash-point to the INT1 of monolithic chip 8031 end, burning-point interrupts application, through judging again the flash-point that records has been recorded signal by P1.6 mouth output flash-point, show flash-point burning-point values by six displays 11, by tri-colour LED 8 and send sound and light alarm, its thermometric error is 0.1% ± 0.5 ℃, of the present utility model being characterised in that: flash-point detector 19 is by 0.1～0.8 millimeter nickel chromium triangle of diameter, the heap formula thermopair that the nisiloy silk is formed, nickel chromium triangle and nisiloy silk alternately series connection welding are continuous " V " font and " V " font that falls, and following contact is the A end, and upper contact is the B end.

2, analyzer according to claim 2 is characterized in that nickel chromium triangle, nisiloy filament diameter are 0.1 millimeter.

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