CN103675322A - Rotating speed measuring instrument - Google Patents
Rotating speed measuring instrument Download PDFInfo
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- CN103675322A CN103675322A CN201310461423.9A CN201310461423A CN103675322A CN 103675322 A CN103675322 A CN 103675322A CN 201310461423 A CN201310461423 A CN 201310461423A CN 103675322 A CN103675322 A CN 103675322A
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- 230000003750 conditioning effect Effects 0.000 claims abstract description 22
- 238000009666 routine test Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003139 buffering effect Effects 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
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000010998 test method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000009897 systematic effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 239000003990 capacitor Substances 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
- 230000009286 beneficial 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
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Abstract
The invention provides a rotating speed measuring instrument which comprises a counting logic control circuit, a decoding circuit, a signal conditioning circuit, a buffer output circuit, an alarm circuit, a regular test and relay output circuit, a clock circuit, a display circuit, an analog output circuit and a power supply circuit. The counting logic control circuit is connected with the decoding circuit, the signal conditioning circuit, the regular test and relay output circuit and the clock circuit; the output of the decoding circuit is connected with the alarm circuit, the regular test and relay output circuit, the display circuit and the analog output circuit; the output of the clock circuit is connected with the counting logic control circuit, the decoding circuit, the alarm circuit and the display circuit; and the output of the signal conditioning circuit is connected with the counting logic control circuit and the buffer output circuit. The rotating speed measuring instrument employs a total hardware design, and measures the rotating speed via a period test method, wherein measurement is accurate, response time is fixed, operation is stable and reliable, and problems including dead halt and program abnormity of a routine rotating speed meter do not occur.
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 movement condition monitoring, and rotating speed exceeds normal range of operation and will have a strong impact on the safe operation of plant equipment.At present, adopt monolithic processor controlled intelligent revolution meter to be widely used at industrial circle, its tachometric survey adopts more frequently presses conversion, counting method or measuring period method, tachometric survey precision, response time, reliability depend on hardware systems framework and software algorithm, can not be applicable to tachometric survey to have the special monitoring environment of 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, utilize measuring period method to measure rotating speed, and have routine test function and systematic survey accurately, the advantage such as the response time fixes, antijamming capability is strong, stable and reliable operation, speed are fast, there is not the problems such as deadlock that conventional rotating speed table is prone to, program operation exception.
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 is connected with buffering output circuit with logical circuit of counter control circuit, wherein:
Signal conditioning circuit carries out pre-service to provide logical circuit of counter control circuit required rotational speed pulse signal for the two-way signals of rotational speed sensor that it is received;
Tacho-pulse after Buffer output circuit output conditioning, for sensor signal detection;
Logical circuit of counter control circuit is for counting and generate the control signal of other circuit in instrument to speed cycle;
Decoding scheme is converted to rotating speed for the speed cycle count value that logical circuit of counter control circuit is obtained;
Warning circuit is for rotating speed and alarm threshold value comparison that decoding scheme is changed, and result output alarm signal based on the comparison;
Routine test and outputting circuit for relay are used for receiving Local or Remote switching value signal with speed-changing table duty, and output alarm signal and instrument mode switching value signal;
Clock circuit is for providing the required clock signal of 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;
Display circuit is used for providing local demonstration and the required data pipe sweep signal of long-range demonstration, thereby rotating speed is shown in to the charactron of instrument front panel, and exports the digital quantity signal of long-range charactron show code;
Analog output circuit is for being converted to electric current and voltage signal by rotating speed.
Further, aforementioned logical circuit of counter control circuit adopts signal synchronization circuit to carry out synchronously rotational speed pulse signal, and uses the control signal of other circuit in finite states machine control speed cycle counting and generation instrument.
Further, aforementioned decoding scheme adopts storage chip to carry out decoding, and the speed cycle count value that the logical circuit of counter control circuit of take generates is memory unit address, and storage chip is carried out to addressing, under the control of control signal, speed cycle count value is converted to rotating speed.
Further, aforementioned signal conditioning circuit includes power filter, signal transformation circuit and signal isolation commutation circuit, the signals of rotational speed sensor that is respectively used to it to receive carries out and pre-service, to provide logical circuit of counter control circuit required rotational speed pulse signal.
Further, aforementioned display circuit comprises counter, code translator, tristate bus line transceiver and output latch, and wherein counter and decoder is controlled 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 with voltage switch pattern output voltage and current signal proportional to rotating speed.
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 (with software approach, realizing the demonstration that rotating speed detects requires high, and can not show in real time instant rotating speed), utilize measuring period method to measure rotating speed, except providing conventional rotating speed to show, report to the police and indicate, outside the functions such as analog output, routine test is also provided, 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 are fast, belong to hard real-time measurement system, and the deadlock that does not exist conventional rotating speed table to be prone to, 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 are for counting the circuit theory diagrams of logic control circuit in Fig. 1 embodiment.
Fig. 3-1, Fig. 3-2 are the circuit theory diagrams of decoding scheme in Fig. 1 embodiment.
Fig. 4-1, Fig. 4-2 are 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 the circuit theory diagrams of 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 are 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 more to understand technology contents of the present invention, especially exemplified by specific embodiment and coordinate appended graphic being described as follows.
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 clock signal is provided, and the output of signal conditioning circuit 3 is connected with buffering output circuit 9 with logical circuit of counter control circuit 1.
Logical circuit of counter control circuit 1 is for counting and generate the control signal of other circuit in instrument to the tacho-pulse RPM signal period of signal conditioning circuit 3 outputs.As Fig. 2-1, Fig. 2-2, shown in 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, and rotational speed pulse signal is carried out synchronously; 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 shown in Fig. 2-3 (U507, U508 and U509) carries out speed cycle counting.
As Fig. 4-1, shown in Fig. 4-2, signal conditioning circuit 3 comprises amplifier U808 and comparer U809, for the two-way signals of rotational speed sensor that it is received, carry out pre-service as amplified, filtering, shaping and isolation, to provide logical circuit of counter control circuit required rotational speed pulse signal, if Fig. 4-1P804 is sensor signal interface, amplifier U808A, U808B and resistance R 824, R825, R826, R827, R832, R833, R14, R16, capacitor C 813, C815 amplifies signals of rotational speed sensor and filtering is processed, comparer U809 and resistance R 835 in Fig. 4-2, R829, R831, R838, R839, R841, capacitor C 814 forms Schmidt trigger sensor signal is carried out to shaping.
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) composition serially concatenated comparer compares tachometer value and the alarm threshold value of decoding scheme 2 outputs, and result output alarm signal based on the comparison, and by flip/flops latch U6B alarm condition, warning in Fig. 5 is low warning, is also that the tachometer value of decoding scheme 2 outputs 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, be used for receiving Local or Remote switching value signal with speed-changing table duty, wherein relay K 700 and K701 combination provide alerting signal output, working state of system to switch, indicate.
As Fig. 7, clock circuit 6 Counter U901 are used for clock signal frequency division so that clock signal required in instrument to be provided, counter U19 and trigger U905A provide time-delay reset signal, the reference frequency signal of the routine test that counter U902, trigger U906B and logic gate U17A, U17B, U18A, U18B, U21A, U21B, U900A, U900B, U904A, U904B, U904C, U907C, U907D generation routine test and outputting circuit for relay 5 are required.
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 local, show and the required data pipe sweep signal of long-range demonstration, thereby rotating speed is shown in to the charactron of instrument front panel, and export the digital quantity signal of long-range charactron show code, counter U410 and code translator U412 control 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 with voltage switch pattern output voltage and current signal proportional to rotating speed, wherein U202 is the DAC chip (AD7541AKR) of 12, U201 is 4～20mA current conversion chip (AD694BR), AD694BR chip provides reference voltage output, and AD7541AKR chip adopts voltage switch pattern to be connected with AD694BR chip.
Tacho-pulse after the 9 output conditionings of Buffer output circuit, for sensor signal detection.As shown in figure 10, the present embodiment Buffer output circuit comprises one shot multivibrator U12A, and tacho-pulse is converted to amplitude and the fixing pulse signal of pulsewidth.
Visible, (demonstration that realizes rotating speed detection with software approach requires high in the design of the tachometer employing devices at full hardware of the present embodiment, and can not show in real time instant rotating speed), utilize measuring period method to measure rotating speed, except providing conventional rotating speed to show, report to the police and indicate, outside the functions such as analog output, routine test is also provided, 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 are fast, belong to hard real-time measurement system, and the deadlock that does not exist conventional rotating speed table to be prone to, 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, adopt counter measures speed cycle, utilize mass storage to realize speed cycle to the decoding of tachometer value, and can improve tachometric survey precision and scope by increasing clock frequency, number of counter bits, memory span and bit wide, without software, can realize rotating speed and accurately measure.
2, adopt devices at full hardware design, systematic survey accurately, the response time fixes, antijamming capability is strong, stable and reliable operation, do not have the problems such as deadlock that conventional rotating speed table is prone to, program operation exception.
3, there is routine test function, by relay assembly, provide local and remote test to control, can switch easily instrument mode, the output of release alarm switch amount.Meanwhile, tachometer provides reference frequency output, without external equipment, can test tachometer of measuring table function, precision.
Although the present invention discloses as above with preferred embodiment, so it is not in order 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 claims person of defining.
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 is connected with buffering output circuit with logical circuit of counter control circuit, wherein:
Signal conditioning circuit carries out pre-service to provide logical circuit of counter control circuit required rotational speed pulse signal for the two-way signals of rotational speed sensor that it is received;
Tacho-pulse after Buffer output circuit output conditioning, for sensor signal detection;
Logical circuit of counter control circuit is for counting and generate the control signal of other circuit in instrument to speed cycle;
Decoding scheme is converted to rotating speed for the speed cycle count value that logical circuit of counter control circuit is obtained;
Warning circuit is for rotating speed and alarm threshold value comparison that decoding scheme is changed, and result output alarm signal based on the comparison;
Routine test and outputting circuit for relay are used for receiving Local or Remote switching value signal with speed-changing table duty, and output alarm signal and instrument mode switching value signal;
Clock circuit is for providing the required clock signal of 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;
Display circuit is used for providing local demonstration and the required data pipe sweep signal of long-range demonstration, thereby rotating speed is shown in to the charactron of instrument front panel, and exports the digital quantity signal of long-range charactron show code;
Analog output circuit is for being converted to electric current and voltage signal by rotating speed.
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 the control signal of other circuit in finite states machine control speed cycle counting and generation 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 that the logical circuit of counter control circuit of take generates is memory unit address, storage chip is carried out to addressing, under the control of control signal, speed cycle count value is converted to rotating speed.
4. tachometer according to claim 1, it is characterized in that, aforementioned signal conditioning circuit includes power filter, signal transformation circuit and signal isolation commutation circuit, the signals of rotational speed sensor that is respectively used to it to receive carries out and pre-service, to provide logical circuit of counter control circuit required rotational speed pulse signal.
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 is controlled 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 with voltage switch pattern output voltage and current signal proportional to rotating speed.
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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310461423.9A CN103675322B (en) | 2013-09-30 | 2013-09-30 | Tachometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310461423.9A CN103675322B (en) | 2013-09-30 | 2013-09-30 | Tachometer |
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| CN103675322B CN103675322B (en) | 2015-08-19 |
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Cited By (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 |
| CN107703440A (en) * | 2017-09-25 | 2018-02-16 | 北京机械设备研究所 | A kind of power inverter automatic testing circuit |
| CN110068700A (en) * | 2018-01-23 | 2019-07-30 | 埃佩多夫股份公司 | The method and apparatus of revolving speed for monitoring 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 |
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| JPH07209316A (en) * | 1994-01-25 | 1995-08-11 | Matsushita Electric Ind Co Ltd | Digital ac servo device |
| CN1374530A (en) * | 2002-04-19 | 2002-10-16 | 华南师范大学 | Revolution meter capable of measuring rotating speed in both forward and reverse directions |
| CN102680726A (en) * | 2011-03-10 | 2012-09-19 | 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 |
-
2013
- 2013-09-30 CN CN201310461423.9A patent/CN103675322B/en active Active
Patent Citations (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 |
| JPH07209316A (en) * | 1994-01-25 | 1995-08-11 | Matsushita Electric Ind Co Ltd | Digital ac servo device |
| CN1374530A (en) * | 2002-04-19 | 2002-10-16 | 华南师范大学 | Revolution meter capable of measuring rotating speed in both forward and reverse directions |
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Cited By (6)
| 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 |
| CN107703440A (en) * | 2017-09-25 | 2018-02-16 | 北京机械设备研究所 | A kind of power inverter automatic testing circuit |
| CN110068700A (en) * | 2018-01-23 | 2019-07-30 | 埃佩多夫股份公司 | The method and apparatus of revolving speed for monitoring element |
| US11298707B2 (en) | 2018-01-23 | 2022-04-12 | Eppendorf Ag | Method and device for monitoring the rotational speed of an element |
| CN110068700B (en) * | 2018-01-23 | 2022-05-27 | 埃佩多夫股份公司 | Method and device for monitoring the rotational speed of a component |
| 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 |
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| CN103675322B (en) | 2015-08-19 |
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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. |