CN87205253U - Computer digital display micrometer - Google Patents
Computer digital display micrometer Download PDFInfo
- Publication number
- CN87205253U CN87205253U CN 87205253 CN87205253U CN87205253U CN 87205253 U CN87205253 U CN 87205253U CN 87205253 CN87205253 CN 87205253 CN 87205253 U CN87205253 U CN 87205253U CN 87205253 U CN87205253 U CN 87205253U
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- China
- Prior art keywords
- measuring staff
- circuit
- flexible member
- gauge
- voltage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The utility model comprises a section displaying code drive circuit and a place gated circuit and measuring results can be displayed by liquid crystal numeral tubes.
Description
The utility model is relevant with the mechanical value measuring instrument, and is especially relevant with the mechanical quantity electronic measuring instrument.
Existing mechanical flowmeter table has machinery, optics, electronics multiple.Use the mechanical value measuring instrument of more employing principles of electrical measurement in process of production, can reach 0.001mm as the inductive displacement measuring instrument measuring accuracy, but owing to adopt differential transformer, bulky, the circuit complexity, power consumption is big, affected by environment big, use inconvenient.Electric capacity formula weight instrument relies on the capacitive reactance that changes electric capacity itself of moving of capacitance sheet, thereby detects displacement, but also owing to the circuit complexity, environmental impact uses greatly and seldom.Most widely used micrometer instrument has the clock-type dial gauge in machine-building and repairing at present, clock gauge, and its precision of lever and gear wheel dial gauge is 0.01mm or 0.001mm.Its principle of work be by lever and gear transmit, the fault in enlargement signal.The measuring accuracy of this class instrument depends on the quality of fit and the assembly precision of each several part mechanical organ.Since complex structure, the processing cost height, and easy to wear, measuring error is big.Measure by total indicator reading, very inconvenient, more increased human error.Existing resistance-strain type displacement transducer, its principle of work be based on " strain effect " of conductor, i.e. the physical phenomenon that changes with its mechanically deform of conductor resistance.The mechanical quantity that need are measured can be changed into electric weight so that further electrical measurement.Use resistance strain gage as the stress measurement means, the history in year surplus in the of 40 has been arranged,, be widely adopted in the sensor of acceleration measuring various physical quantitys such as power, pressure, torque, displacement.But owing to there is non-linear factor, temperature is waftd factor and is influenced measuring accuracy.Be not used in relative measurement such as linearity in the machinery manufacturing industry for many years, flatness, the measurement of circularity etc.
The purpose of this utility model is that proposition is a kind of easy to use, and volume is little, and dynamic response is good, and linear characteristic is good, is not subjected to such environmental effects, the electric measuring type form and position error measurement instrument that measuring accuracy is high.The utility model can replace present widely used mechanical type dial gauge, clock gauge.
The utility model is by the gauge head sensor, voltage amplifier circuit, analog to digital conversion circuit, single chip microcomputer, display driver circuit, display is formed, and the fixing cantilever flexible member of an end that the gauge head sensor is installed by a vertically arranged measuring staff and a level is formed, resistance strain gage R1, R2 and R3, R4 are affixed on the upper and lower surface of flexible member respectively and are linked to be electric bridge, measuring staff contacts with flexible member on-fixed end lower surface, and in order to measure minus deviation, measuring staff should make the pre-deflection of flexible member.The other end of measuring staff contacts with the measured workpiece surface, when measuring staff produces displacement owing to the morpheme error of surface of the work, flexible member produces associated flexural, thus resistance R 1, R2 and R3, the identical and opposite polarity strain resistance change of R4 generating capacity, bridge output voltage generation respective change.
Resistance strain gage of the present utility model is a semiconductor gauge.Voltage amplifier circuit is made the input utmost point by two voltage followers, improves voltage input impedance, and with input mode and operational amplifier connection in the same way, entire circuit is in high input impedance, the duty of high cmrr.
In order to measure the positive and negative deviation of workpiece, gauge head is in pre-stressed state, has zero-regulator resistor that the prestress output voltage is transferred to standard value.Analog to digital conversion circuit is 12 or 10 A/D chips, and the A/D chip converts analog voltage signal to the binary digit voltage signal, sends into single chip microcomputer and handles.Single chip microcomputer is made up of CPU, ROM, RAM and two IO interface.Because the character of the material of the flexible member of sensor, mounting means, resistance strain gage, temperature variation cause the influence of factor such as bridge resistor variation, the input-output characteristic of sensor exists non-linear.But fix for its non-linear factor of certain sensor.Therefore, when computing machine is for data processing, can use the curve fitting mode, the sensor input-output characteristic curve be carried out match approach, with lookup table mode each section parameter be compensated again simultaneously.The main effect of single chip microcomputer is to use the suitable algorithm program to improve measuring accuracy.Owing to when making form and position error measurement, have positive negative error.Gauge head is in pre-stressed state work, and sensor has a prestress output voltage signal, and is corresponding, has a prestress digital voltage signal.Another effect of single chip microcomputer is to differentiate positive and negative morpheme error signal.Single-chip microcomputer when work is benchmark with the prestress digital voltage signal, during greater than this benchmark, is overgauge, during less than this benchmark, is minus deviation.When minus deviation occurring, first display digit lower right corner radix point is luminous.Display driver circuit is made up of seven segment drive circuits and four code selection driving circuits.It is binary data output to be converted to export after 7 sections of numerical digits show sign indicating number that single chip microcomputer also has an effect again.Display is a liquid crystal numberal tube.
Measuring staff of the present utility model is made up of last measuring staff and following measuring staff, and there is screw thread last measuring staff lower end, and there is screw following measuring staff upper end, last measuring staff can screw in down measuring staff and regulate measuring staff length, check nut is arranged, and there is connecting screw rod the upper end of watchcase, has the cross bar of a two ends projection and screw rod to link.Said structure is convenient to measuring workpieces internal diameter error.By holding out against nut, make working sensor simultaneously at pre-stressed state to the springs preload in the watchcase sleeve.
The utility model is used for the semiconductor gauge sensor technology machine-building and repairs widely used micrometer amount instrument.Solve non-linearly with microcomputer, temperature is waftd, all problems of explanation degree, use the LED light-emitting nixie tube to show reading, end makes electric detecting technology can be used to detect the morpheme error except human error, replace traditional cost height, use and do not make mechanical type dial gauge, clock gauge that precision is not high.The utility model volume is little, and is easy to use, the measuring accuracy height, and dynamic response is good, explanation degree height, output amplitude is big.Be not subjected to Effect of Environmental, working stability is reliable.Measuring accuracy can improve 1-2 the order of magnitude than dial gauge.
Fig. 1 is a stereographic map of the present utility model.
Fig. 2 is the A-A cut-open view of Fig. 1.
Fig. 3 is the B-B cut-open view of Fig. 1.
Fig. 4 is a circuit block diagram of the present utility model.
Fig. 5 is circuit theory diagrams of the present utility model.
Following is embodiment of the present utility model:
The utility model is by the gauge head sensor, voltage amplifier, and 12 A/D chips of ADC1210,8748 monoboard microcomputers, display driver circuit, 4 liquid crystal numberal tubes are formed.
The gauge head sensor has watchcase 1, and power-supply battery 2 in the electric bridge is housed in the shell, and supply voltage is 5 volts.F3140 voltage follower 3,4 is arranged on the circuit board, F741 operational amplifier 5, ADC1210 A/D chip 6,8748 single chip microcomputers 7, LS273 shows sign indicating number driving circuit 8 and 4 75452 gating drive circuits 9 and four resistance for seven sections.The upper and lower surface that 4 semiconductor gauges 11 are affixed on shell fragment 10 is linked to be electric bridge.Last measuring staff 12 can screw in down the screw of measuring staff 17, whole measuring staff adjustable length.Screw tight by set nut 16.Spring 13 is packed in the watchcase sleeve, by holding out against nut 14 precompression.Nut cap 15 can make shell fragment 10 pre-deflections.Potentiometer 18 is arranged, 19,4 liquid crystal numberal tubes 20 of switch on the watchcase.
Voltage amplifier is made the input utmost point by two F3140 voltage followers 3,4, connects with homophase input mode and F741 operational amplifier 5, and potentiometer 18 is transferred to standard value with the prestress output voltage.
8748 single chip microcomputers 7 are by CPU, ROM RAM, and two IO interface are formed.The output line of ADC1210 A/D chip 6 connects with the bus (BUS) of 8748 single chip microcomputers and the segment signal line of I/O interface respectively.Wherein, the output line D of 12 A/D chips
0-D
3P with the I/O interface
24P
25P
26P
27Link.The D of A/D chip
4-D
12And the D of microcontroller bus (BUS)
0-D
7Link.Because gauge head is operated in pre-stressed state, the output valve of voltage amplifier is non-vanishing predetermined value, and the A/D chip also has corresponding predetermined output valve, and this value is eliminated in program by 8748 single-chip microcomputers.
Display driver circuit is made up of seven sections demonstration sign indicating number driving circuits 8 of LS273 and 4 75452 gating drive circuits 9.The input end D of seven segment drive circuits 8
0-D
7Respectively with the P of single-chip microcomputer
10-P
17Interface links to each other.The output terminal Q of driving circuit 8
0-Q
8A, b, c, d, e, f, g, dp foot with 4 liquid crystal numberal tubes 20 links respectively.4 gating drive circuits are made up of two 75452 NAND gate circuit.Its input end A
1, B
1, A
2, B
2Respectively with single-chip microcomputer P
20-P
23Interface links.Its output terminal Y
1, Y
2One, two, three, four gating end with 4 liquid crystal numberal tubes 20 links respectively.Single-chip microcomputer is when output data, and earlier position gating signal of output gating drive circuit (register is selected in the position) that puts in place send a numeral to 7 segment drivers (7 segment register) again, so just can demonstrate a numeral on charactron.
Use suitable algorithm program was approached calculating to the input-output characteristic curve of sensor do match when 8748 single-chip microcomputers of the present utility model were for data processing, and by lookup table mode each section parameter was compensated to improve measuring accuracy again.In addition,, when image data, use the mean algorithm program, promptly, remove a maximal value then, remove a minimum value, remake mean value computation 8 times, make the error signal that records more true each measuring point METHOD FOR CONTINUOUS DETERMINATION 10 times in order to eliminate random disturbance.
Working routine of the present utility model is as follows:
Start-same measuring point is gathered 10 secondary data, and make 8 mean value computation one and do curve The Fitting Calculation-minute little compensation of section work ginseng-7 sections demonstration sign indicating numbers of work conversion-demonstrations.Surveying work goes round and begins again and carries out.
The utility model test morpheme error range :-2000 μ m---+2000 μ m.
Claims (3)
1, computer digital display dial gauge is characterized in that by the gauge head sensor, voltage amplifier circuit, analog to digital conversion circuit, single chip microcomputer, display driver circuit, display is formed, the fixing cantilever flexible member of an end that said gauge head sensor is installed by a vertically arranged measuring staff and a level is formed, and resistance strain gage R1, R2 and R3, R4 are affixed on respectively on the flexible member, and lower surface is formed electric bridge, measuring staff contacts with flexible member on-fixed end lower surface, and makes the pre-deflection of flexible member.
2, the computer digital display dial gauge that claim 1 proposed, it is characterized in that said voltage amplifier circuit is by two voltage followers do input utmost points, connect with homophase input mode and differential amplifier, there is zero-regulator resistor that the prestress output voltage is transferred to standard prestress output voltage, said analog to digital conversion circuit is the A/D modulus conversion chip, said single chip microcomputer is by CPU, ROM, two IO interface of RAM are formed, said display driver circuit is made up of seven sections demonstration sign indicating number driving circuits and a position gating drive circuit, said display is a liquid crystal numberal tube, and said resistance strain gage is a semiconductor gauge.
3, claim 1, the 2 computer digital display dial gauges that propose is characterized in that said measuring staff is made up of last measuring staff and following measuring staff, there is screw thread last measuring staff lower end, there is screw following measuring staff upper end, last measuring staff can screw in down measuring staff and regulate measuring staff length, and check nut is arranged, and has to hold out against nut to the springs preload in the watchcase sleeve, there is connecting screw rod the upper end of watchcase, has the cross bar of a two ends projection and screw rod to link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87205253 CN87205253U (en) | 1987-11-28 | 1987-11-28 | Computer digital display micrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87205253 CN87205253U (en) | 1987-11-28 | 1987-11-28 | Computer digital display micrometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87205253U true CN87205253U (en) | 1988-07-27 |
Family
ID=4821046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87205253 Withdrawn CN87205253U (en) | 1987-11-28 | 1987-11-28 | Computer digital display micrometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87205253U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987780A (en) * | 2015-02-02 | 2016-10-05 | 国家电网公司 | High-precision measurement ammeter stand spring pressure circuit |
| CN106151218A (en) * | 2016-08-23 | 2016-11-23 | 无锡市东赫金属制品有限公司 | A kind of telescopic bolt |
| CN106152925A (en) * | 2016-08-29 | 2016-11-23 | 西安旭彤电子科技股份有限公司 | A kind of spring displacement transducer |
| CN110749271A (en) * | 2019-10-11 | 2020-02-04 | 成都飞机工业（集团）有限责任公司 | Wireless shape and position measuring device |
-
1987
- 1987-11-28 CN CN 87205253 patent/CN87205253U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987780A (en) * | 2015-02-02 | 2016-10-05 | 国家电网公司 | High-precision measurement ammeter stand spring pressure circuit |
| CN106151218A (en) * | 2016-08-23 | 2016-11-23 | 无锡市东赫金属制品有限公司 | A kind of telescopic bolt |
| CN106152925A (en) * | 2016-08-29 | 2016-11-23 | 西安旭彤电子科技股份有限公司 | A kind of spring displacement transducer |
| CN110749271A (en) * | 2019-10-11 | 2020-02-04 | 成都飞机工业（集团）有限责任公司 | Wireless shape and position measuring device |
| CN110749271B (en) * | 2019-10-11 | 2021-12-10 | 成都飞机工业（集团）有限责任公司 | Wireless shape and position measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |