CN2278936Y - Multifunctional iron melt quality tester - Google Patents
Multifunctional iron melt quality tester Download PDFInfo
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- CN2278936Y CN2278936Y CN 96234910 CN96234910U CN2278936Y CN 2278936 Y CN2278936 Y CN 2278936Y CN 96234910 CN96234910 CN 96234910 CN 96234910 U CN96234910 U CN 96234910U CN 2278936 Y CN2278936 Y CN 2278936Y
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- single chip
- differential amplifier
- chip microcomputer
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Abstract
The utility model relates to a multifunctional iron melt quality tester, comprising a testing circuit and a sensor. The testing circuit is provided with a pseudo 16-bit single chip microcomputer in which an A/D converter is provided, and the periphery of the pseudo 16-bit single chip microcomputer is extended with a programme memory and a data memory. The output terminal of an electric thermocouple signal processing unit and the output terminal of an electric thermocouple cold-terminal compensating circuit unit are respectively connected with the A/D input terminals of the pseudo 16-bit single chip microcomputer. The utility model can test the chemical composition, the mechanical property, the spheroidizing rate, the temperature of iron liquor and environment temperature. The utility model is accurate in testing data, stable and reliable in performance, small in volume, light in weight, high in performance / price ratio, very simple in operation, strong in anti-interference capability, being adequate for the front locales of the stoves of a large casting house, a medium casting house and a small casting house whose environment conditions are bad.
Description
The utility model relates to a kind of iron liquid quality multi-tester, especially uses the Microcomputer Detecting instrument of hot analytical test iron liquid quality.
Existing thermal analyzer, its main frame all adopt non-industrial computing machines such as single card microcomputer or APPLE machine, and this class computer circuitry complex structure, big, the poor anti jamming capability of volume are not suitable for the on-the-spot use in casting smelting stokehold.
The purpose of this utility model is that it is not only simple in structure, volume is little, and antijamming capability is strong at a kind of iron liquid quality multi-tester of the problems referred to above proposition, the on-the-spot use before the suitable for casting smelting furnace.
The technical solution of the utility model is, a kind of iron liquid quality multi-tester, comprise test circuit and sensor, its special character is to be provided with 16 single chip microcomputers of standard that include A/D converter in the test circuit, its peripheral expansion has memory under program, data memory and I/O interface, and the output terminal of the output terminal of thermocouple signal processing unit and cold junction compensation circuit unit connects with the A/D input end of accurate 16 single chip microcomputers respectively.
And, the thermocouple signal processing unit is provided with the same differential amplifier that is in parallel of the Gain Adjustable of being made up of three OP-07, K type thermopair negative terminal links with an input end of above-mentioned differential amplifier behind the zero shift circuit by relay, its anode links with another input end of differential amplifier that is in parallel together, the positive and negative end of Type B thermopair links with two input ends of above-mentioned differential amplifier respectively by relay, and the A/D input end of the output terminal of differential amplifier and single chip microcomputer links.
And the amplitude limiter circuit unit that the output terminal of above-mentioned differential amplifier is formed by two switch diodes connects with the A/D input end of single chip microcomputer.
And, the cold junction compensation circuit unit is to be temperature sensor with AD590, the positive and negative end of AD590 connects the negative input end and the negative supply of integrated operational amplifier respectively, the positive input terminal of integrated operational amplifier passes through resistance eutral grounding, negative input end connects stabilized voltage supply by adjustable potentiometer, the A/D input end of output terminal order sheet microcomputer behind two switch diode amplitude limits, the feedback circuit of integrated operational amplifier is provided with adjustable potentiometer.
And, also being provided with the dial-up input block of correction factor and time, the knob input block that test function is selected and trade mark of casting iron is selected in the test circuit, dial-up and rotary switch all link by expansion I/O interface and single chip microcomputer.
And, be provided with in the test circuit and be tester, the clock circuit unit of real-time clock is provided.
The utility model because simple with peripheral circuit, antijamming capability is strong at the high-performance single chip microcomputer of industry spot design is main frame, thereby simple in structure, volume is little, antijamming capability is strong, the on-the-spot use before the special suitable for casting smelting furnace.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is the single chip microcomputer circuit unit figure in the utility model test circuit.
Fig. 3 is dial-up and the knob input block figure in the utility model test circuit.
Fig. 4 is thermocouple signal treatment circuit unit and the cold junction compensation circuit unit figure in the utility model test circuit.
Referring to Fig. 1～4, the utility model comprises sensor and test circuit, and sensor is: (1) K type thermopair: be located in the test specimens cup, be used to write down but curve of iron liquid cooling; (2) Type B thermopair: be used to detect the iron liquid temp; (3) AD590: be used for the double cold junction compensation of environment temperature test.Be provided with accurate 16 8098 single chip microcomputer U1 and extender memory U4[27256 in the test circuit] and data memory U5[6264], thermocouple signal processing unit, cold junction compensation unit, dial-up and rotary switch input block, reset circuit unit, MC146818 real time clock circuit unit, led display unit and printout.
AD0～the AD7 of 16 8098 single chip microcomputer U1 of standard in the utility model test circuit respectively with memory under program U4[27256] D0～D7 and data memory U5[6264] D0～D7, latch U2[74LS373] D0～D7, I/O parallel interface U7[8255] D0～D7, I/O parallel interface and RAM memory U6[8155] AD0～AD7 link, A8～the A15 of U1 and U3[GAL16V8] I1～I8 link, A8～A14 of U1 also links with A8～A14 of U4, and A8～A12 of U1 and A8～A12 of U5 link; Q0～Q7 of U2 links with A0～A7 of U4 and A0～A7 of U5 respectively; The output terminal O1 of U3～O6 output chip selection signal H1～H6, the sheet with U4 selects the sheet of CE, U5 to select the sheet of CS1, U6 to select the sheet of CE, U7 to select the sheet choosing of the MC146818 chip of CS, the choosing of led display unit sheet and clock circuit unit to link respectively.The output terminal O7 of U3 connects the READY pin of U1.The RD of the OE of U4, the OE of U5, U6, the RD of U7, all the RD pin with U1 links, and the WR of the WE of U5, the WR of U6, U7 all links with the WR pin of U1.The ALE of U6 meets the ALE of U1; The IO/ M pin of U6 connects the A12 pin of U1, and the A0 of U7, A1 meet Q0, the Q1 of U2 respectively, and the resetting pin RST of U1 meets negative reset signal-R, and the resetting pin RESET of U6, U7 meets positive reset signal+R.
The work schedule of U1 is provided by the oscillatory circuit that U1 home loop and the crystal oscillator OSC that links to each other with pin XTAL1, XTAL2 and capacitor C 2, C3 form.
The A/D conversion reference voltage of U1 is by Z1[LM336], the circuit formed of W1, C4, C1, R16 provides (see figure 2), the Z1 anode connects a positive voltage by resistance R 16, negativing ending grounding, the positive and negative end of Z1 joins with VREF, the AGND of U1 and the two ends of potentiometer W1 respectively, the adjustable side of the adjusting termination W1 of Z1.
10 BCD dial-ups are adopted in numerical value input of the present utility model, are used to import correction factor and time parameter.Expansion I/O interface U7[8255] I/O mouth PCO～PC3 respectively with binary-coded decimal-10 ary codes code translator U8[74LS145] input end A～D join, the output terminal 0～9 of U8 connects the control end of 10 binary-coded decimals respectively, and the binary-coded decimal output terminal " 1 " of 10 dial-ups (is " 1-1 ", " 2-1 " " 3-1 " of dial-up ... " 9-1 ", " 10-1 " pin) respectively with Sheffer stroke gate U12[74LS133] input end (1,2,3,4,5,6,7,10,11,12 pin) join; In like manner, 10 binary-coded decimal output terminals " 2 ", " 4 ", " 8, " respectively with Sheffer stroke gate U11[74LS133], U10[74LS133], U9[74LS133] input end join; The empty input end of U9, U10, U11, U12 all meets high level VCC, and its output terminal meets I/O mouth PB0～PB3 of U7 respectively.During use, the utility model is selected signal by the position of I/O mouth PC0～PC3 output dial-up of Single-chip Controlling U7, only choose a slice at every turn, the control end of selected dial-up is a low level, other dial-up control end is a high level, read the numerical value of selected dial-up again from I/O mouth PB0～PB3, reach from the purpose of dial-up to the detector input value.Rotary switch K1 of the present utility model, K2 are two 5 sections rotary switches, 5 gears that test function is selected knob K1 respectively with U6[8155] I/O interface PB1～PB5 be connected, also link to each other the common end grounding of PR1 with 5 resistance terminal of exclusion PR1 respectively simultaneously; Trade mark of casting iron selects 5 gears of knob K2 to be connected with I/O interface PC0～PC4 of U6 respectively, also links to each other the common end grounding of PR2, the public termination high level of rotary switch K1, K2 with 5 resistance terminal that row organizes PR2 respectively simultaneously.During use, the utility model can read K1, K2 present position from PB, the PC of interface chip U6, makes detector enter the duty of appointment according to the position of K1, K2.The utility model design rotary switch and dial-up carry out man-machine conversation, make it simple, convenient, directly perceived.
K type cold junction compensation in the utility model environment temperature test circuit of holding concurrently is to be temperature sensor with AD590, by AD590 and U13[OP-07] integrated operational amplifier forms environment temperature test circuit.The positive input terminal of U13 is by R15 ground connection, negative input end connects by Z3[LM336 by resistance R 13, potentiometer P4] on the burning voltage that provides, the feed resistance of returning of U13 is composed in series by R14 and potentiometer P5, and the positive and negative end of AD590 connects negative input end and the negative supply of U13 respectively.Temperature-measuring range can be limited in required temperature range by regulating P4, P5, in this interval, the output voltage of environment temperature and U13 is linear, and the output voltage of U13 meets the A/D input port ACH5 of single-chip microcomputer 8098 behind switch diode D3, D4 amplitude limit.Because of AD590 is the current-output type device, have very strong antijamming capability, and precision height, the linearity are good, guaranteed the precision of the utility model cold junction compensation.
The utility model be provided with K type thermopair and Type B thermopair shared by U15[OP-07], U16[OP-07], U14[OP-07] the same differential amplifier that is in parallel of the Gain Adjustable formed of three slices integrated transporting dischargings, the gain-adjusted of K type thermopair and Type B thermopair and input signal switch by monolithic processor controlled two relay J, J1 finishes, thermocouple signal is after nursing one's health with the differential amplifier that is in parallel, through switch diode D1, send into the A/D input end ACH4 of single-chip microcomputer 8098 behind the D2 amplitude limit, the same differential amplifier of being made up of three OP-07 that is in parallel is divided into two-stage, the first order is by U15, U16 constitutes differential amplifier, the feed resistance of returning of U15 is R6, the feed resistance of returning of U16 is R9, the gain of K type thermopair is regulated by potentiometer P2, and the gain of Type B thermopair is regulated by potentiometer P3, the gain switching is finished by relay J.The second level constitutes differential amplifier alone by U14, return the feed resistance and be R12, end of oppisite phase joins by resistance R 10 and U15 output terminal, normal phase input end joins by resistance R 11 and U16 output terminal, also between 1,8 pin of amplifier U14, be connected to zero potentiometer P6 simultaneously by resistance R 8 ground connection, it regulates the termination positive supply, and the output end signal of U14 is promptly sent into single chip microcomputer and carried out the A/D conversion behind amplitude limit.
When carrying out the test of iron liquid temp, function selecting knob K1 is pointed to PB1, it is high level that tester one detects PB1, promptly enter iron liquid temp test mode, on PC6, the PC7 of U7, export high level, make triode Q1[3DG6], Q2[3DG6] conducting, relay J, J1 adhesive, relay switch switches to the Type B thermocouple location.Gain is regulated by potentiometer P3.The positive and negative end of Type B thermopair two input ends of the same differential amplifier that is in parallel by resistance R 7, R5 and above-mentioned Gain Adjustable respectively links, at this moment, tester promptly detects thermoelectrical potential size on the Type B thermopair at any time, after the Type B thermopair inserts iron liquid, just detect the rapid rising of temperature, and send digital the demonstration with the temperature situation of change that rises, after several seconds, the Type B electric thermo-couple temperature rises to iron liquid actual temperature (being the peak temperature), at this moment, temperature no longer rises, and this maximum temperature is sent digital the demonstration, and through the printer printout.In the time of print result, read the date and the time of clock circuit, export in the lump with test result.Thereby finish the thermometric process one time.
When composition and measuring mechanical property are learned in iron liquefaction, K1 is pointed to PB2, K2 points to the trade mark of casting iron of iron liquid to be measured simultaneously, it is high level that test circuit detects PB2, just change chemical constitution and measuring mechanical property state over to, PC6 at U7, the last output low level of PC7, make triode Q1, Q2 ends, relay J, the J1 outage, the switch of relay switches to K type thermocouple location, gain is regulated by potentiometer P2, the negative terminal of K type thermopair is through potentiometer P1, resistance R 1, R2, R3, an input end of the adjustable same differential amplifier that is in parallel of insertion gain behind the bridge circuit zero shift that R4 forms, the reference power supply of zero shift is by Z2[LM336] provide, the anode of K type idol connects another input end of amplifier by resistance R 7, at this moment, test circuit promptly detects the size of thermoelectric heat on the K type thermopair at any time, after pouring into the test specimens cup that has K type thermopair when iron liquid, temperature sharply rises, when temperature rises to peak, and when beginning to descend, tester promptly to the iron liquid cooling in the sample cup but process constantly sample, and simultaneously environment temperature is sampled, store in the data memory after K type idol temperature added compensation temperature, treat that temperature is chilled to the iron liquid-solid phase line temperature when following, sampling process finishes, at this moment, the cooling curve of iron liquid all is stored in the data memory, tester is analyzed cooling curve more automatically, find out the characteristic temperature on the cooling curve, calculate by the mathematical model that is solidificated in the memory under program, and revise with the correction factor that the correction factor dial-up is sent into, composition and mechanical property are learned in the iron liquefaction that has just obtained required test, test result are sent digital the demonstration and printer prints output again.In the time of print result, read the date and the time of clock circuit, export in the lump with test result.
During the test of spheroidal-graphite cast iron nodularization rate, rotary switch K1 is pointed to PB3, K2 points to spheroidal-graphite cast iron, it is high level that test macro detects PB3, make to change magnesium iron nodularization rate test mode over to, it is identical with above-mentioned chemical constitution test process that the sampling of its cooling curve and characteristic temperature are searched, after eigenwert finds, calculate the nodularization rate of spheroidal-graphite cast iron by the nodularization rate computing formula of having solidified, output test result then and the date.
When carrying out the environment temperature test, rotary switch K1 is pointed to PB5, it is high level that test macro detects PB5, just changes environment temperature tracking and testing state over to.At any time environment temperature is shown on nixie display.
Claims (6)
1, a kind of iron liquid quality multi-tester, comprise test circuit and sensor, it is characterized in that being provided with in the test circuit 16 single chip microcomputers of standard that include A/D converter, its peripheral expansion has memory under program, data memory and I/O interface, and the output terminal of the output terminal of thermocouple signal processing unit and cold junction compensation circuit unit connects with the A/D input end of accurate 16 single chip microcomputers respectively.
2, detector according to claim 1, it is characterized in that the thermocouple signal processing unit is provided with the same differential amplifier that is in parallel of the Gain Adjustable of being made up of three OP-07, K type thermopair negative terminal links with an input end of the same differential amplifier that is in parallel of Gain Adjustable behind the zero shift circuit by relay, anode links with another input end of differential amplifier that is in parallel together, the Type B thermopair just, negative terminal links with two input ends of the same differential amplifier that is in parallel of Gain Adjustable respectively by relay, and the output terminal of differential amplifier and the A/D input end of single chip microcomputer link with being in parallel.
3, detector according to claim 2 is characterized in that linking by the amplitude limiter circuit unit of two switch diodes compositions and the A/D input end of single chip microcomputer with the output terminal of the differential amplifier that is in parallel.
4, according to claim 1 or 2 or 3 described detectors, it is characterized in that the cold junction compensation circuit unit is is temperature sensor with AD590, the positive and negative end of AD590 connects the negative input end and the negative supply of integrated operational amplifier respectively, the positive input terminal of integrated operational amplifier passes through resistance eutral grounding, negative input end connects stabilized voltage supply by adjustable potentiometer, the A/D input end of output terminal order sheet microcomputer behind two switch diode amplitude limits, the feedback circuit of integrated operational amplifier is provided with adjustable potentiometer.
5, detector according to claim 4, it is characterized in that, also be provided with the dial-up input block of correction factor and time, the knob input block that test function is selected and trade mark of casting iron is selected in the test circuit, dial-up and rotary switch all link by expansion I/O interface and single-chip microcomputer.
6, detector according to claim 5 is characterized in that being provided with in the test circuit clock circuit unit that real-time clock is provided for tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96234910 CN2278936Y (en) | 1996-05-23 | 1996-05-23 | Multifunctional iron melt quality tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96234910 CN2278936Y (en) | 1996-05-23 | 1996-05-23 | Multifunctional iron melt quality tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2278936Y true CN2278936Y (en) | 1998-04-15 |
Family
ID=33911129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96234910 Expired - Fee Related CN2278936Y (en) | 1996-05-23 | 1996-05-23 | Multifunctional iron melt quality tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2278936Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196422B (en) * | 2007-12-19 | 2011-12-07 | 济南钢铁股份有限公司 | Eight-channel billet temperature measuring instrument based on K type thermocouple and water container cooperated with it |
| CN105301032A (en) * | 2014-06-13 | 2016-02-03 | 南京华欣分析仪器制造有限公司 | Calculation method for discrete function inflection point in iron component analysis system |
-
1996
- 1996-05-23 CN CN 96234910 patent/CN2278936Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196422B (en) * | 2007-12-19 | 2011-12-07 | 济南钢铁股份有限公司 | Eight-channel billet temperature measuring instrument based on K type thermocouple and water container cooperated with it |
| CN105301032A (en) * | 2014-06-13 | 2016-02-03 | 南京华欣分析仪器制造有限公司 | Calculation method for discrete function inflection point in iron component analysis system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |