CN103675322B - Tachometer - Google Patents
Tachometer Download PDFInfo
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- CN103675322B CN103675322B CN201310461423.9A CN201310461423A CN103675322B CN 103675322 B CN103675322 B CN 103675322B CN 201310461423 A CN201310461423 A CN 201310461423A CN 103675322 B CN103675322 B CN 103675322B
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- 238000009666 routine test Methods 0.000 claims abstract description 25
- 230000003750 conditioning effect Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 7
- 230000009897 systematic effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005039 memory span Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Abstract
The invention provides a kind of tachometer, comprise logical circuit of counter control circuit, decoding scheme, signal conditioning circuit, Buffer output circuit, warning circuit, routine test and outputting circuit for relay, clock circuit, display circuit, analog output circuit and power circuit, logical circuit of counter control circuit and aforementioned decoding scheme, signal conditioning circuit, routine test and outputting circuit for relay, and clock circuit connects, the output of decoding scheme and warning circuit, routine test and outputting circuit for relay, display circuit and analog output circuit connect, the output of clock circuit and logical circuit of counter control circuit, decoding scheme, warning circuit and display circuit connect, the output of signal conditioning circuit and logical circuit of counter control circuit and cushion output circuit and be connected.The present invention adopts the design of devices at full hardware, utilizes measuring period method to survey rotating speed, measures accurately, the response time is fixed, stable and reliable operation, and there is not the problem such as deadlock, program exception that conventional rotating speed table easily occurs.
Description
Technical field
The present invention relates to measurement instrument field, in particular to a kind of tachometer.
Background technology
Rotating speed is the important parameter of Mechanical Running Condition monitoring, and rotating speed exceeds normal operation range will have a strong impact on the safe operation of plant equipment.At present, monolithic processor controlled intelligent revolution meter is adopted to be widely used at industrial circle, the many employings of its tachometric survey press conversion, counting method or measuring period method frequently, tachometric survey precision, response time, reliability depend on hardware systems framework and software algorithm, can not be applicable to special monitoring environment tachometric survey being had to strict demand completely.
Summary of the invention
The object of the invention is to provide a kind of tachometer, adopt the design of devices at full hardware, measuring period method is utilized to measure rotating speed, and have routine test function and systematic survey accurately, the advantage such as the response time is fixed, antijamming capability is strong, stable and reliable operation, speed are fast, there is not the problem such as deadlock, program operation exception that conventional rotating speed table easily occurs.
For reaching above-mentioned purpose, the present invention proposes a kind of tachometer, comprise logical circuit of counter control circuit, decoding scheme, signal conditioning circuit, Buffer output circuit, warning circuit, routine test and outputting circuit for relay, clock circuit, display circuit, analog output circuit and power circuit, logical circuit of counter control circuit and aforementioned decoding scheme, signal conditioning circuit, routine test and outputting circuit for relay, and clock circuit connects, the output of decoding scheme and warning circuit, routine test and outputting circuit for relay, display circuit and analog output circuit connect, the output of clock circuit and logical circuit of counter control circuit, decoding scheme, warning circuit and display circuit connect, the output of signal conditioning circuit and logical circuit of counter control circuit and cushion output circuit and be connected, wherein:
Signal conditioning circuit is used for carrying out pre-service to provide the rotational speed pulse signal needed for logical circuit of counter control circuit to its two-way signals of rotational speed sensor received;
Buffer output circuit exports the tacho-pulse after conditioning, for sensor signal detection;
Logical circuit of counter control circuit is used for counting speed cycle and generates the control signal of other circuit in instrument;
The speed cycle count value that decoding scheme is used for logical circuit of counter control circuit to obtain is converted to rotating speed;
Warning circuit is used for the rotating speed changed by decoding scheme and compares with alarm threshold value, and result output alarm signal based on the comparison;
Routine test and outputting circuit for relay are for receiving Local or Remote on-off model with speed-changing table duty, and output alarm signal and instrument mode on-off model;
Clock circuit for providing clock signal needed for logical circuit of counter control circuit, decoding scheme, warning circuit and display circuit and reset signal, and exports aforementioned routine test and outputting circuit for relay carries out routine test reference frequency used;
Rotating speed for providing the data pipe sweep signal needed for local display and long-range display, thus is shown in the charactron of instrument front panel by display circuit, and exports the digital quantity signal of long-range numeral method code;
Analog output circuit is used for rotating speed to be converted to electric current and voltage signal.
Further, aforementioned logical circuit of counter control circuit adopts signal synchronization circuit to carry out synchronously rotational speed pulse signal, and uses finite states machine control speed cycle to count and generate the control signal of other circuit in instrument.
Further, aforementioned decoding scheme adopts storage chip to carry out decoding, and the speed cycle count value generated with logical circuit of counter control circuit, for memory unit address, is carried out addressing to storage chip, under control of the control signal speed cycle count value is converted to rotating speed.
Further, aforementioned signal modulate circuit includes power filter, signal transformation circuit and signal isolation commutation circuit, be respectively used to carry out and pre-service its signals of rotational speed sensor received, to provide the rotational speed pulse signal needed for logical circuit of counter control circuit.
Further, aforementioned display circuit comprises counter, code translator, tristate bus line transceiver and output latch, and wherein counter and decoder controls the data pipe sweep signal of tristate bus line transceiver and output latch output speed.
Further, aforementioned analog output circuit adopts digital analog converter and 4 ~ 20mA special chip to export the voltage and current signal proportional with rotating speed with voltage switching mode.
Further, aforementioned Buffer output circuit adopts one shot multivibrator to generate the tacho-pulse of fixed amplitude and pulsewidth.
From the above technical solution of the present invention shows that, beneficial effect of the present invention is to adopt the design of devices at full hardware, and (demonstration realizing Rotating speed measring with software approach requires high, and instant rotating speed can not be shown in real time), measuring period method is utilized to measure rotating speed, show except providing conventional rotating speed, report to the police and indicate, outside the functions such as analog output, also provide routine test, the functions such as reference frequency I/O, systematic survey is accurate, response time is fixed, antijamming capability is strong, stable and reliable operation and speed is fast, belong to hard real-time measurement system, and there is not the deadlock that conventional rotating speed table easily occurs, the problems such as program operation exception, be applicable to tachometric survey precision, response time, the indexs such as reliability have the tachometric survey of the special dimension (as nuclear power station) of strict demand.
Accompanying drawing explanation
Fig. 1 is the module diagram of the tachometer of preferred embodiment of the present invention.
Fig. 2-1, Fig. 2-2, Fig. 2-3 is the circuit theory diagrams counting logic control circuit in Fig. 1 embodiment.
Fig. 3-1, Fig. 3-2 is the circuit theory diagrams of decoding scheme in Fig. 1 embodiment.
Fig. 4-1, Fig. 4-2 is the circuit theory diagrams of signal conditioning circuit in Fig. 1 embodiment.
Fig. 5 is the circuit theory diagrams of warning circuit in Fig. 1 embodiment.
Fig. 6 is circuit theory diagrams that are regular in Fig. 1 embodiment and outputting circuit for relay.
Fig. 7 is the circuit theory diagrams of clock circuit in Fig. 1 embodiment.
Fig. 8-1, Fig. 8-2 is the circuit theory diagrams of display circuit in Fig. 1 embodiment.
Fig. 9 is the circuit theory diagrams of analog output circuit in Fig. 1 embodiment.
Figure 10 is the circuit theory diagrams of Buffer output circuit in Fig. 1 embodiment.
Embodiment
In order to more understand technology contents of the present invention, institute's accompanying drawings is coordinated to be described as follows especially exemplified by specific embodiment.
As shown in Figure 1, according to preferred embodiment of the present invention, tachometer comprises logical circuit of counter control circuit 1, decoding scheme 2, signal conditioning circuit 3, warning circuit 4, routine test and outputting circuit for relay 5, clock circuit 6, display circuit 7, analog output circuit 8, Buffer output circuit 9 and power circuit 10.As shown in Figure 1, logical circuit of counter control circuit 1 is connected with aforementioned decoding scheme 2, signal conditioning circuit 3, routine test and outputting circuit for relay 5 and clock circuit 6, the output of decoding scheme 2 is connected with warning circuit 4, routine test and outputting circuit for relay 5, display circuit 7 and analog output circuit 8, the output of clock circuit 6 is connected with logical circuit of counter control circuit 1, decoding scheme 2, warning circuit 4 and display circuit 7 and provides clock signal, the output of signal conditioning circuit 3 and logical circuit of counter control circuit 1 and cushion output circuit 9 and be connected.
Logical circuit of counter control circuit 1 counts for the tacho-pulse RPM signal period exported signal conditioning circuit 3 and generates the control signal of other circuit in instrument.As shown in Fig. 2-1, Fig. 2-2, Fig. 2-3, in the present embodiment, logical circuit of counter control circuit 1 comprises trigger, logic gate sum counter.Wherein: in Fig. 2-1, trigger U501A, U501B and logic gate U502C form signal synchronization circuit, carry out synchronously to rotational speed pulse signal; In Fig. 2-2, trigger U505A, U505B and logic gate U502A, U502B, U503B, U503E, U503F, U504A, U504B, U504C, U506B, U506C, U506D form finite state machine; Counter (U507, U508 and U509) shown in Fig. 2-3 carries out speed cycle counting.
Decoding scheme 2 is converted to rotating speed for the speed cycle count value obtained by logical circuit of counter control circuit 1, storage chip is adopted to carry out decoding, the speed cycle count value generated with logical circuit of counter control circuit is for memory unit address, addressing is carried out to storage chip, under control of the control signal speed cycle count value is converted to rotating speed.As shown in Fig. 3-1, Fig. 3-2, in the present embodiment, decoding scheme 2 comprises massive store chip (U300, U305) and latch (U301, U302, U304).Under the control signal Flash_CE# of logical circuit of counter control circuit 1 generation and the control of LatchNT, storage chip uses speed cycle counting to carry out addressing as memory unit address to storer, the tachometer value (content of storage unit) that the output speed cycle is corresponding, and by latch, tachometer value is latched.
As Fig. 4-1, shown in Fig. 4-2, signal conditioning circuit 3 comprises amplifier U808 and comparer U809, two-way signals of rotational speed sensor for receiving it carries out pre-service as amplified, filtering, shaping and isolation, to provide the rotational speed pulse signal needed for logical circuit of counter control circuit, if Fig. 4-1P804 is sensor signal interface, amplifier U808A, U808B and resistance R824, R825, R826, R827, R832, R833, R14, R16, electric capacity C813, C815 amplifies signals of rotational speed sensor and filtering process, comparer U809 and resistance R835 in Fig. 4-2, R829, R831, R838, R839, R841, electric capacity C814 forms Schmidt trigger and carries out shaping to sensor signal.
Shown in figure 5, warning circuit 4 comprises comparer U1, U2, U3, U4, U5 and trigger U6B, wherein five comparer chips (U1, U2, U3, U4, U5) form tachometer value that serially concatenated comparer exports decoding scheme 2 and alarm threshold value compares, and result output alarm signal based on the comparison, and by flip/flops latch U6B alarm condition, warning in Fig. 5 is low warning, and the tachometer value of also i.e. decoding scheme 2 output is lower than alarming threshold value alarm.
Shown in figure 6, routine test and outputting circuit for relay 5 comprise transistor Q700, Q701 and relay K 700, K701, for receiving Local or Remote on-off model with speed-changing table duty, wherein relay K 700 and K701 combination provide alerting signal output, working state of system switches, instruction.
As Fig. 7, clock circuit 6 Counter U901 is used for clock signal frequency division to provide clock signal required in instrument, counter U19 and trigger U905A provides delayed reset signal, and counter U902, trigger U906B and logic gate U17A, U17B, U18A, U18B, U21A, U21B, U900A, U900B, U904A, U904B, U904C, U907C, U907D generate the reference frequency signal of routine test and the routine test needed for outputting circuit for relay 5.
As Fig. 8-1, shown in Fig. 8-2, display circuit 7 comprises counter U410, code translator U412, tristate bus line transceiver U413, U414, U415, U416, U417(is as shown in Fig. 8-1) and output latch U401, U402, U419(is as shown in Fig. 8-2), for providing the data pipe sweep signal needed for local display and long-range display, thus rotating speed is shown in the charactron of instrument front panel, and export the digital quantity signal of long-range numeral method code, counter U410 and code translator U412 controls tristate bus line transceiver and output latch output speed scanning code displaying.
As shown in Figure 9, analog output circuit 8 adopts digital analog converter (DAC) and 4 ~ 20mA special chip to export the voltage and current signal proportional with rotating speed with voltage switching mode, wherein U202 is the DAC chip (AD7541AKR) of 12, U201 is 4 ~ 20mA electric current conversion chip (AD694BR), AD694BR chip provides reference voltage to export, and AD7541AKR chip adopts voltage switching mode to be connected with AD694BR chip.
Buffer output circuit 9 exports the tacho-pulse after conditioning, for sensor signal detection.As shown in Figure 10, the present embodiment Buffer output circuit comprises one shot multivibrator U12A, tacho-pulse is converted to the pulse signal that amplitude and pulsewidth are fixing.
Visible, (demonstration realizing Rotating speed measring with software approach requires high in the design of the tachometer employing devices at full hardware of the present embodiment, and instant rotating speed can not be shown in real time), measuring period method is utilized to measure rotating speed, show except providing conventional rotating speed, report to the police and indicate, outside the functions such as analog output, also provide routine test, the functions such as reference frequency I/O, systematic survey is accurate, response time is fixed, antijamming capability is strong, stable and reliable operation and speed is fast, belong to hard real-time measurement system, and there is not the deadlock that conventional rotating speed table easily occurs, the problems such as program operation exception, be applicable to tachometric survey precision, response time, the indexs such as reliability have the tachometric survey of the special dimension (as nuclear power station) of strict demand.
In sum, remarkable advantage of the present invention is:
1, counter measures speed cycle is adopted, mass storage is utilized to realize the decoding of speed cycle to tachometer value, and improve tachometric survey precision and scope by increasing clock frequency, number of counter bits, memory span and bit wide, rotating speed can be realized without the need to software and accurately measure.
2, adopt devices at full hardware design, systematic survey accurately, the response time is fixed, antijamming capability is strong, stable and reliable operation, there is not the problem such as deadlock, program operation exception that conventional rotating speed table easily occurs.
3, there is routine test function, provide local and remote test to control by relay assembly, instrument mode can be switched easily, unlock alarm switch amount and export.Meanwhile, tachometer provides reference frequency to export, and can test without the need to external equipment to tachometer of measuring table function, precision.
Although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is when being as the criterion depending on those as defined in claim.
Claims (7)
1. a tachometer, it is characterized in that, comprise logical circuit of counter control circuit, decoding scheme, signal conditioning circuit, Buffer output circuit, warning circuit, routine test and outputting circuit for relay, clock circuit, display circuit, analog output circuit and power circuit, logical circuit of counter control circuit and aforementioned decoding scheme, signal conditioning circuit, routine test and outputting circuit for relay, and clock circuit connects, the output of decoding scheme and warning circuit, routine test and outputting circuit for relay, display circuit and analog output circuit connect, the output of clock circuit and logical circuit of counter control circuit, decoding scheme, warning circuit and display circuit connect, the output of signal conditioning circuit and logical circuit of counter control circuit and cushion output circuit and be connected, wherein:
Signal conditioning circuit is used for carrying out pre-service to provide the rotational speed pulse signal needed for logical circuit of counter control circuit to its two-way signals of rotational speed sensor received;
Buffer output circuit exports the tacho-pulse after conditioning, for sensor signal detection;
Logical circuit of counter control circuit is used for counting speed cycle and generates the control signal of other circuit in instrument;
The speed cycle count value that decoding scheme is used for logical circuit of counter control circuit to obtain is converted to rotating speed;
Warning circuit is used for the rotating speed changed by decoding scheme and compares with alarm threshold value, and result output alarm signal based on the comparison;
Routine test and outputting circuit for relay are for receiving Local or Remote on-off model with speed-changing measurement instrument duty, and output alarm signal and instrument mode on-off model;
Clock circuit for providing clock signal needed for logical circuit of counter control circuit, decoding scheme, warning circuit and display circuit and reset signal, and exports aforementioned routine test and outputting circuit for relay carries out routine test reference frequency used;
Rotating speed for providing the data pipe sweep signal needed for local display and long-range display, thus is shown in the charactron of instrument front panel by display circuit, and exports the digital quantity signal of long-range numeral method code;
Analog output circuit is used for rotating speed to be converted to electric current and voltage signal.
2. tachometer according to claim 1, it is characterized in that, aforementioned logical circuit of counter control circuit adopts signal synchronization circuit to carry out synchronously rotational speed pulse signal, and uses finite states machine control speed cycle to count and generate the control signal of other circuit in instrument.
3. tachometer according to claim 1, it is characterized in that, aforementioned decoding scheme adopts storage chip to carry out decoding, the speed cycle count value generated with logical circuit of counter control circuit is for memory unit address, addressing is carried out to storage chip, under control of the control signal speed cycle count value is converted to rotating speed.
4. tachometer according to claim 1, it is characterized in that, aforementioned signal modulate circuit includes power filter, signal transformation circuit and signal isolation commutation circuit, be respectively used to carry out pre-service to its signals of rotational speed sensor received, to provide the rotational speed pulse signal needed for logical circuit of counter control circuit.
5. tachometer according to claim 1, it is characterized in that, aforementioned display circuit comprises counter, code translator, tristate bus line transceiver and output latch, and wherein counter and decoder controls the data pipe sweep signal of tristate bus line transceiver and output latch output speed.
6. tachometer according to claim 1, is characterized in that, aforementioned analog output circuit adopts digital analog converter and 4 ~ 20mA special chip to export the voltage and current signal proportional with rotating speed with voltage switching mode.
7. tachometer according to claim 1, is characterized in that, aforementioned Buffer output circuit adopts one shot multivibrator to generate the tacho-pulse of fixed amplitude and pulsewidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310461423.9A CN103675322B (en) | 2013-09-30 | 2013-09-30 | Tachometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310461423.9A CN103675322B (en) | 2013-09-30 | 2013-09-30 | Tachometer |
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| CN103675322A CN103675322A (en) | 2014-03-26 |
| CN103675322B true CN103675322B (en) | 2015-08-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107228952A (en) * | 2017-06-20 | 2017-10-03 | 南京航空航天大学 | A kind of high reliability rotating speed transducer module |
| CN107703440B (en) * | 2017-09-25 | 2020-06-16 | 北京机械设备研究所 | Automatic test circuit of power converter |
| DE102018101457A1 (en) * | 2018-01-23 | 2019-07-25 | Eppendorf Ag | Method and device for monitoring the speed of an element |
| CN110488039A (en) * | 2019-08-20 | 2019-11-22 | 禹盟自动化科技(上海)有限公司 | The overproof warning device of speed |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3619285A1 (en) * | 1986-06-07 | 1987-12-10 | Jutronik Gmbh | Electronic circuit for obtaining speed signals and data on angles of rotation from a resolver synchro (synchro resolver) using the amplitude method |
| JP3248143B2 (en) * | 1994-01-25 | 2002-01-21 | 松下電器産業株式会社 | Digital AC servo device |
| CN1162706C (en) * | 2002-04-19 | 2004-08-18 | 华南师范大学 | Revolution meter capable of measuring rotating speed in both forward and reverse directions |
| CN102680726B (en) * | 2011-03-10 | 2014-04-16 | 广西大学 | High-precision adaptive device for motor rotation speed measurement |
| CN203519633U (en) * | 2013-09-30 | 2014-04-02 | 江阴众和电力仪表有限公司 | Rotating speed measuring instrument |
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Owner name: CNNC CHINA NUCLEAR POWER ENGINEERING CO., LTD.;HAN Free format text: FORMER OWNER: JIANGYIN ZHONGHE ELECTRIC POWER APPARATUS CO., LTD. Effective date: 20150128 Owner name: JIANGYIN ZHONGHE ELECTRIC POWER APPARATUS CO., LTD Effective date: 20150128 |
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Inventor after: Fan Sui Inventor after: Liu Jun Inventor after: Hu Qianlong Inventor after: Shang Xuelian Inventor after: Xiao Daiyun Inventor after: Liu Guixing Inventor after: Zhang Ruiping Inventor before: Liu Guixing Inventor before: Du Xing Inventor before: Hu Qianlong |
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Free format text: CORRECT: INVENTOR; FROM: LIU GUIXING DU XING HU QIANLONG TO: FAN SUI LIU JUN HU QIANLONG SHANG XUELIAN XIAO DAIYUN LIU GUIXING ZHANG RUIPING Free format text: CORRECT: ADDRESS; FROM: 214432 WUXI, JIANGSU PROVINCE TO: 100840 HAIDIAN, BEIJING |
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Effective date of registration: 20150128 Address after: 100840 Beijing West Third Ring Road, Haidian District, No. 117 Applicant after: China Nuclear Power Engineering Co., Ltd. Applicant after: Jiangyin Zhonghe Electric Power Apparatus Co., Ltd. Address before: 214432 West Bridge Road, Jiangsu, Wuxi, No. 8 Applicant before: Jiangyin Zhonghe Electric Power Apparatus Co., Ltd. |
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Effective date of registration: 20180213 Address after: 100840 Beijing West Third Ring Road, Haidian District, No. 117 Co-patentee after: Jiangsu Li Li Instrument Control Technology Co., Ltd. Patentee after: China Nuclear Power Engineering Co., Ltd. Address before: 100840 Beijing West Third Ring Road, Haidian District, No. 117 Co-patentee before: Jiangyin Zhonghe Electric Power Apparatus Co., Ltd. Patentee before: China Nuclear Power Engineering Co., Ltd. |