CN2386449Y

CN2386449Y - Electrical instrument for estimating service life of electromechanical equipment

Info

Publication number: CN2386449Y
Application number: CN 99234726
Authority: CN
Inventors: 马红光; 王国华; 许建锋; 朱晓菲; 张京祥
Original assignee: Tech Dev Center No2 Artillery Engrg College Pla
Current assignee: Tech Dev Center No2 Artillery Engrg College Pla
Priority date: 1999-06-24
Filing date: 1999-06-24
Publication date: 2000-07-05
Anticipated expiration: 2009-06-24

Abstract

The utility model relates to an electrical instrument for estimating the service life of electromechanical equipment, which belongs to the technical field of indicating or recording concerned with electric variable measurement. The utility model relates to an electrical instrument for automatically recording cumulative power consumption of equipment, times of powering on, and the time for working. The utility model is provided with a current sensor, an interface circuit, a voltage collecting circuit, a power measuring circuit, a single chip computer circuit, a displayer circuit, a power supply circuit and a power supply supervision circuit, wherein, the voltage collecting circuit can ensure the isolation of a digital circuit and AC voltages of the instrument; the power supply supervision circuit can offer plenty of time for preserving data. The use of the utility model offers reliable and scientific base to scientific management, the life evaluation and equipment design of electromechanical equipment; the utility model has wide and practical foreground for using.

Description

A kind of electromechanical equipment electrical instrumentation in serviceable life of assessing

The utility model belongs to indication or the recording technique field relevant with electric variable measurement, relates to a kind ofly can writing down mechanical, electrical equipment accumulative total power consumption, start number of times and the electrical instrumentation of working time automatically.

Any mechanical, electrical equipment all has specific serviceable life, and the various modern chemical weapons device that especially uses on national defence equipment is to its reliability with very strict requirement is arranged serviceable life.When the time of equipment operation reaches serviceable life soon, be in a kind of non-steady state, and may break down at any time, in the prior art before the utility model, to the serviceable life of mechanical, electrical equipment, generally adopt the method for manual record operation hours to carry out coarse evaluation.This method is owing to factors such as personal error and poor management lattice, and often assessment result is unreliable.And according to the requirement of fail-safe analysis, the time of only noting equipment operation is far from being enough, and the state of valuator device also needs to understand the accumulative total power consumption and the start number of times of equipment, like this ability objective, comprehensively, serviceable life of assessment apparatus exactly.

According to above-mentioned to the assessment of mechanical, electrical service life of equipment objective requirement and national defence on to the requirement of sophisticated weapon Equipment Reliability, obviously science is not inaccurate yet for the method that existing usefulness manually writes down.The purpose of this utility model is, provide a kind of electrical instrumentation of start number of times, working time and power consumption that can self recording apparatus, with the accuracy that improves reliability to mechanical, electrical service life of equipment, assessment with improve worker, ore deposit enterprise modern management level to mechanical, electrical equipment.

Now the utility model technical solution is described below:

Basic design of the present utility model is electric current, the voltage signal that will collect, by power-measuring circuit, the instantaneous power consumption of equipment under test is converted to corresponding frequency signal, by the open and close machine power on signal of power supply supervision circuit with equipment under test, send into single-chip microcomputer simultaneously, the software programming by single-chip microcomputer realizes the record to equipment accumulated running time, start number of times and power consumption.It is characterized in that: the utlity model has current sensor and interface circuit, voltage collection circuit, power-measuring circuit, single chip circuit, display circuit, power circuit and power supply supervision circuit; The current signal of current sensor connects power-measuring circuit through sensor interface circuitry, and the voltage signal acquisition circuit connects power-measuring circuit, power-measuring circuit output with the power signal of frequency representation to single chip circuit; Power circuit connects power supply supervision circuit, and power supply supervision circuit connects sensor interface circuitry, single chip circuit and display circuit simultaneously; Display circuit connects light-emitting diode display; Voltage collection circuit is by divider resistance R ₁₁, R ₁₂, R ₁₃Constitute, voltage acquisition terminates on the output terminal of transformer; Power-measuring circuit is finished by the AD7750 chip, and electric current, voltage signal connect 3,4 pin and 6,7 pin of AD7750 respectively, by the TO end of 20 pin output power signals to single-chip microcomputer; Power supply supervision circuit is by 74HC04 chip and divider resistance R ₁₀Constitute R ₁₀Be variable resistor, 4 pin of 74HC04 connect external interrupt INT1, the INT0 input end of single-chip microcomputer; Single chip circuit is by 89C2051 single-chip microcomputer (U ₁), E ²PROM (93C46, U ₆), equipment under test condition indication circuit (light emitting diode D ₁And resistance R ₆), show state change-over circuit (button S ₁, S ₂And resistance R ₇, R ₅) and the crystal oscillating circuit formation, the P of single-chip microcomputer _1.4～P _1.7Mouth and Serial E ²PROM links to each other, P _1.0, P _1.1Mouth is an open-drain I/O end, P _1.0, P _1.3Be show state input signal end, the serial port of single-chip microcomputer links to each other with display circuit.

Now the utility model is described in further detail in conjunction with the accompanying drawings:

Fig. 1: the utility model schematic block circuit diagram (built-in)

Fig. 2: the utility model schematic block circuit diagram (external)

Fig. 3: voltage collection circuit design with insulation blocking effect

Fig. 4: power circuit and power supply supervision circuit design

Fig. 5: power-measuring circuit wiring schematic diagram

Fig. 6: single chip circuit wiring schematic diagram

Among Fig. 1, current sensor adopts Hall element, and whether have electric current flow through, according to the size of equipment under test power consumption, can select the sensor of different ranges for use if being used for measuring equipment under test supply line, and sensor interface circuitry has the sensor load resistance R ₁, R ₂With capacitance-resistance filter group of networks R ₃, R ₄, C ₇, C ₈When equipment is switched on, the voltage signal of the output-current rating signal base voltage Acquisition Circuit output of current sensor is input to the power-measuring circuit that is made of AD7750 and peripheral circuit, under the situation of the digital circuit of guaranteeing the electrical equipment black box and alternating current 220V voltage isolation, through A/D conversion and integration, be converted into power signal, input in the single chip circuit 89C2051 single-chip microcomputer TO end, calculate power consumption and add up by single-chip microcomputer with frequency representation.The serial port of single-chip microcomputer links to each other with display circuit, measured data is transported to display by serial port, send the data of two bytes whenever single-chip microcomputer after, all in display circuit, apply a positive pulse signal on the data latching control end of driver, actuator latch and decoding are transported to decode results the LED charactron then and show, when data presented is cumulative time of equipment operation and power consumption, charactron by the hour, divide master slave mode and KWH, 0.01KWH mode shows, when data presented is the energising number of times of equipment, charactron will show the numerical value of these data by turn.

Fig. 2 is the utility model external schematic block circuit diagram, its principle is with built-in identical, different only be to adopt the 89C52 single-chip microcomputer, adopt and not powered by the switching power supply of equipment under test power supply control, adopt LCD display, set up the microprinting interface circuit simultaneously.

Fig. 3 is a voltage collection circuit, by divider resistance R ₁₁, R ₁₂, R ₁₃Constitute, voltage acquisition terminates on the output terminal of transformer, with the digital circuit of guaranteeing instrument and the isolation of alternating voltage, R ₁₃Be variable resistor, regulate R ₁₃To adapt to the requirement that voltage signal extracts.

Fig. 4 is power circuit and power supply supervision circuit, and power circuit is for the mu balanced circuit of series connection, by transformer, rectifier bridge BRIDGE, three terminal regulator MC7805T and filter capacitor C ₅, C ₆, constitute, for power supply supervision circuit provides required working power; Power supply supervision circuit is by 74HC04 and divider resistance R ₁₀Constitute, 7AHC04 is a not gate, by regulating variable resistor R ₁₀, make the not gate input voltage be in on-level, at equipment under test energising duration of work, the output perseverance is a high level, the external interrupt INT1 end of input single-chip microcomputer, as timing start and stop control signal, the negative edge of this signal is as the external interrupt signal of single-chip microcomputer simultaneously, be used for realizing the measurement of equipment under test energising number of times, work as device powers down, when the voltage of this input end is lower than on-level slightly, 74HC04 exports a voltage jump signal from high to low, and this signal is added on external interrupt 0 (INT0) input end of single-chip microcomputer, preserves the time that provides sufficient for data.

Fig. 5 is a power-measuring circuit, constitute by AD7750 chip and peripheral circuit, current signal is by 3,4 pin input channels 1, voltage signal has 6,7 pin input channels 2, AD7750 is with conversion of

passage

1,2 signal A/Ds and integration, be converted into the power signal with frequency representation, the TO that is exported to single-chip microcomputer by 20 pin holds external crystal oscillator 3.57954MHZ.

Single chip circuit among Fig. 6 is by 89C2051 single-chip microcomputer (U ₁), E ²PROM (93C46, U ₆), equipment under test condition indication circuit (light emitting diode D ₁And resistance R ₆), show state change-over circuit (button S ₁, S ₂And resistance R ₇, R ₅) and the crystal oscillating circuit formation, the P of single-chip microcomputer _1.4～P _1.7Mouth and Serial E ²PROM links to each other, P _1.0, P _1.1Mouth is an open-drain I/O end, P _1.0, P _1.3Be show state input signal end, the serial port of single-chip microcomputer links to each other with the display circuit input port, sends data with the driver of ＂ pattern O ＂ mode in display circuit, and by the control code translator decode results is transported to LED or LCD charactron.

Major function of the present utility model and technical parameter are:

1, the working time of accumulative total equipment under test.Maximum measuring time is 999999 hours 59 minutes, single measurement error≤1 minute.

2, when equipment under test transfers off-position to by the energising duty, this instrument record start number of times once.Dominant record value 99999999 times.

3, accurately write down the equipment under test power consumption.Largest cumulative power consumption 99999999KWH is accurate to 0.01KWH.

4, adopt Serial E ²PROM preserves measurement data, and when equipment under test outage or unexpected power down, measurement data all can be written into E ²PROM.E ²Online repeatedly erasable 100000 times of PROM%, the data retention periods is 100 years.

5, adopt eight LED or LCD charactron display, by showing switching button, can show the accumulative total working time of equipment under test respectively, start number of times and power consumption.

Practicing of the utility model electrical instrumentation will provide reliable scientific basis for scientific management, life appraisal and the device design of mechanical, electrical equipment, has very reality and wide application value.

Claims

1, a kind of electrical instrumentation of assessing mechanical, electrical service life of equipment is characterized in that: have current sensor and interface circuit, voltage collection circuit, power-measuring circuit, single chip circuit, display circuit, power circuit and power supply supervision circuit; The current signal of current sensor connects power-measuring circuit through sensor interface circuitry, and the voltage signal acquisition circuit connects power-measuring circuit, power-measuring circuit output with the power signal of frequency representation to single chip circuit; Power circuit connects power supply supervision circuit, and power supply supervision circuit connects sensor interface circuitry, single chip circuit and display circuit simultaneously; Display circuit connects light-emitting diode display.

2, a kind of electrical instrumentation of assessing mechanical, electrical service life of equipment according to claim 1, it is characterized in that: if the utility model is taked external, then single-chip microcomputer adopts the 89C52 chip, connect the microprinting interface circuit between single chip circuit and display circuit, display circuit connects LCD display.

3, a kind of electrical instrumentation of assessing mechanical, electrical service life of equipment according to claim 1, it is characterized in that: voltage collection circuit is by divider resistance R ₁₁, R ₁₂, R ₁₃Constitute, voltage acquisition terminates on the output terminal of transformer; Power supply supervision circuit is by 74HC04 chip and divider resistance R ₁₀Constitute, 4 pin of 74HC04 connect external interrupt INT1, the INT0 input end of single-chip microcomputer.

4, according to claim 1 and 2 described a kind of electrical instrumentations of assessing mechanical, electrical service life of equipment, it is characterized in that: single chip circuit is by 89C2051 or 89C52 single-chip microcomputer, E ²PROM,, equipment under test condition indication circuit, show state change-over circuit and crystal oscillating circuit constitute the P of single-chip microcomputer _1.4～P _1.7Mouth and Serial E ²PROM links to each other, P _1.0, P _1.1Mouth is an open-drain I/O end, P ₁₀, P ₁₃Be show state input signal end, the serial port of single-chip microcomputer links to each other with display circuit.