CN102721463A - Written test apparatus for measuring rotating machinery reciprocating vibration by using piezoelectric effect - Google Patents
Written test apparatus for measuring rotating machinery reciprocating vibration by using piezoelectric effect Download PDFInfo
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Abstract
The invention relates to equipment for measuring rotating machinery reciprocating vibration and belongs to the industrial detection equipment field. A written test apparatus for measuring rotating machinery reciprocating vibration by using piezoelectric effect comprises a built-in piezoelectric acceleration sensor and a boost power supply circuit. The written test apparatus is characterized in that: the piezoelectric acceleration sensor is connected with a signal pretreatment circuit; a signal of the piezoelectric acceleration sensor is transmitted to the signal pretreatment circuit so as to carry out signal filtering, after the filtering, the signal is transmitted to an A/D converting circuit so that a simulation signal is converted into a digital signal; the A/D converting circuit is connected with a single chip microcomputer processing circuit; the single chip microcomputer processing circuit comprises a determination module, a data processing module, a measurement data storage module, an evaluation comparison module and a display output module; the display output module is connected with a display circuit; an input portion of the boost power supply circuit is connected with a cell and an output is connected with the piezoelectric acceleration sensor, the signal pretreatment circuit, the single chip microcomputer processing circuit and the display circuit respectively.
Description
Technical field
The present invention relates to a kind of equipment of measuring the double vibrations of rotating machinery, relate in particular to the device of velocity amplitude that the piezoelectric effect of utilizing piezoelectric ceramics is measured the double vibrations of rotating machinery.
Background technology
In the vibration protection of rotating machinery, the reference of estimating mechanical vibration mainly contains vibration acceleration, vibration velocity, vibration displacement.Vibration velocity reflects the speed of vibration, wherein often needs the effective value (RMS representes) of measuring vibrations speed.
In the portable set of existing measuring vibrations speed, following three big shortcomings are arranged:
1, only shows the value of measuring separately, measurement result is not estimated, machine is not protected the action director.
Measurement result is how on earth, need the user to write down measured value after, or feel by rule of thumb to judge, or be exactly comparison " machine vibration grading standard ".
The portable set of measuring vibrations speed all is in evaluation criterion of equipment surface printing basically or only in instructions, provides evaluation criterion at present.To in evaluation criterion, find out evaluation result although be not difficulty very, but can make mistakes unavoidably, neither be very convenient, and to the people that rigidly connects the machine vibration that touches easy error more just.Just very high to employee's requirement of operating machines like this, if not reaction rapidly possibly cause the damage of machine immediately, consequence can't be estimated.
2, show dimness.
At present great majority all are use liquid crystal display, because volume and power consumption, do not do backlight, therefore dimness relatively, when bad or visual angle is bad at light with regard to ugly clear video data.
3, measuring accuracy is low.
The range of the portable set of existing measuring vibrations speed adopts the range of 200mm/s, and resolution has only 0.1mm/s, and under the just very big situation of 20mm/s, range is big but precision is too low with respect to general mechanical vibration speed.
Summary of the invention
Technical matters to be solved by this invention provides a kind of written examination device that utilizes piezoelectric effect to measure the rotating machinery double vibrations; Solving existing equipment has only measured value to show; Do not estimate and the protection action director, the measured value precision is not enough, and equipment shows dim defective.
Technical scheme
A kind of written examination device that utilizes piezoelectric effect to measure the rotating machinery double vibrations; Comprise built-in piezoelectric acceleration sensor and booster power supply circuit; It is characterized in that: said piezoelectric acceleration sensor connects signal pre-processing circuit; The signal of piezoelectric acceleration sensor is sent to signal pre-processing circuit carries out filtering signals; Being sent to the A/D change-over circuit after the filtration is digital signal with analog signal conversion, and said A/D change-over circuit connects the single-chip microcomputer treatment circuit, and said single-chip microcomputer treatment circuit comprises judge module, data processing module, measurement data preservation module and passes judgment on comparison module; And demonstration output module; Said demonstration output module connects display circuit, and the importation of said booster power supply circuit connects battery, and output is connected with display circuit with piezoelectric acceleration sensor, signal pre-processing circuit, single-chip microcomputer treatment circuit respectively.
Said signal pre-processing circuit comprises signal amplification low pass circuit; Integrating amplification circuit and real effective detecting circuit, the signal that piezoelectric acceleration sensor is sent amplifies, become d. c. voltage signal after filtering, integration and the real effective detection is sent to the A/D change-over circuit.
Said single-chip microcomputer treatment circuit also comprises measures type selecting module, measurement range selection module and timing shutdown module, and said measurement range selection module is connected with data processing module.
Device also comprises switch key; Said switch key is connected with the timing shutdown module of said single-chip microcomputer treatment circuit; Said timing shutdown module also is connected with booster power supply circuit with the judge module of single-chip microcomputer treatment circuit respectively, comprises setting-up time shutdown submodule and vibration detection shutdown submodule.
Said display circuit adopts the OLED display circuit.
Beneficial effect
The present invention through adopt signal pre-processing circuit to the signal that piezoelectric acceleration sensor transmits amplify, high LPF, integration, effective value detection handle and improved measuring accuracy; Adopt the single-chip microcomputer treatment circuit except vibrating judge through judgement and comparison module are set; Directly outside the output protection action director; Can also better improve measuring accuracy through measurement range selection is set, and reduce power consumption, extension fixture and battery serviceable life through timing shutdown is set.
Description of drawings
Fig. 1 is this device appearance synoptic diagram.
Fig. 2 forms schematic block diagram for this device is inner.
Fig. 3 forms schematic block diagram for single-chip microcomputer treatment circuit in this device.
Fig. 4 is this device workflow schematic block diagram.
Wherein: 1-piezoelectric acceleration sensor, 2-OLED display screen, 3-battery, 4-switch key, 5-battery cover.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing, further set forth the present invention.
To the shortcoming of present vialog, the existing device that designs the new double vibrations that utilizes piezoelectric effect measurement rotating machinery again.
This device mainly comprises built-in piezoelectric acceleration sensor 1, booster power supply circuit, signal pre-processing circuit, A/D change-over circuit, single-chip microcomputer treatment circuit, compositions such as OLED display circuit.Owing to be portable set, therefore must consider power consumption, select the components and parts of low-power consumption as far as possible for use.
Booster power supply circuit: power supply adopts the lithium battery power supply of 3.6V, and each the road power supply that needs is adjusted power supply through the special power supply chip that boosts.Sensor needs the supply voltage of 10V, the supply voltage of signal pre-processing circuit needs ± 5V at least in the circuit, and the OLED display circuit needs the 7.2V supply voltage.Analyze the power supply of back discovery sensor and the power supply of Signal Pretreatment and can use same power supply, to simplify power supply.Just can the battery supply of 3.6V be converted ± 5V into the supply voltage of 7.2V through the LT1944 power supply chip that boosts.
Built-in piezoelectric acceleration sensor: major function is that mechanical vibration are reflected into voltage signal.According to piezoelectric effect, the charge signal that piezoelectric ceramics produces is handled, convert voltage signal into, sensitivity is: 10mV/mm/s
2For the simplification of back pre-process circuit, the design has removed the bias voltage of common piezoelectric acceleration transducer, and employing ± 5V power supply is supplied power to sensor.
Built-in piezoelectric acceleration sensor also will be considered mechanical dimension and shielding except considering electrical parameter, mechanical dimension is more little good more.Concrete face shaping is shown in accompanying drawing 1.
Signal pre-processing circuit:, therefore can filter the part undesired signal through filtering circuit because mechanical vibration are that certain frequency range is arranged.What built-in piezoelectric acceleration sensor was exported is acceleration signal, and sensitivity is: 10mV/mm/s
2, signal demand amplifies, and filtering becomes direct current after integration, the real effective detection and compresses into the A/D change-over circuit.
The A/D change-over circuit: adopting 10 inner A/D of single-chip microcomputer, is digital signal with analog signal conversion.
The single-chip microcomputer treatment circuit: with analog signal conversion is that digital signal is carried out analyzing and processing, provides evaluation result according to evaluation criterion, and shows measured value, demonstration evaluation result and back step protection action director.
For reducing the volume of circuit board, reduce components and parts as far as possible, single-chip microcomputer is just without external crystal-controlled oscillation; Use inner crystal oscillator, the jtag interface circuit that burns program also removes, and just wants earlier welding single-chip microcomputer again behind the burned single-chip microcomputer of the program of single-chip microcomputer; Reduced very big board area, a lot of lines that also lacked cloth.The button of panel is realized switching on and shutting down, type selecting through Single-chip Controlling, the function that measurement data keeps.
Owing to used single-chip microcomputer; The judgment criteria of vibration is built in module and the program; Preserve module and pass judgment on comparison module and the demonstration output module through judge module, data processing module, the measurement data of single-chip microcomputer treatment circuit; Automatically realize measurement, the evaluation of vibration values, the output Presentation Function of vibration speed value; Realize measuring functions such as type selecting, measurement range selection, measurement data maintenance, timing shutdown through measuring type selecting module, measurement range selection module and timing shutdown module, and simplified a lot of circuit.General mechanical vibration speed is just very big at 20mm/s, there is no need to be provided with as present equipment the range of 200mm/s, and under identical resolution, the big more precision of range is low more, and therefore design has increased the measurement range selection module and carried out the setting of range.
Display circuit: 0.84 cun the OLED display screen that the design's sampling is very energy-conservation, brightness is high, even also can be clear that demonstration in the place of dark.
OLED display screen 2 is of a size of 38.10 * 9.20 * 1.60mm, and resolution is: 96 * 16 points, external circuits is simple, through I
2C and microcontroller communication.Brightness can be through the external world the height of power supply voltage control.
Concrete working condition is: after loading onto battery, single-chip microcomputer powers on, program initialization; Give the power supply gating of demonstration and sensor power supply; Booster power supply circuit is started working, and the supply voltage that booster power supply circuit produces gives piezoelectric acceleration sensor 1 power supply, and piezoelectric acceleration sensor 1 produces signal; A/D through the laggard single-chip microcomputer of signal pre-processing circuit exports to the OLED display screen through the two-wire serial interface after the good data of single-chip microcomputer processing circuit processes.If long-time not vibration, single-chip microcomputer treatment circuit out-put supply control signal is closed booster power supply circuit, and piezoelectric acceleration sensor is not worked, and OLED does not show that the single-chip microcomputer treatment circuit gets into sleep pattern; Wake the single-chip microcomputer treatment circuit up, click switch key 4 on the device " HOLD key ", the single-chip microcomputer treatment circuit restarts work, the out-put supply control signal, and piezoelectric acceleration sensor 1 is started working, and OLED display screen 2 shows.If in measuring process, pin " HOLD " key, the vibration values at that moment that the demonstration maintenance is unclamped is constant, and shutting down automatically behind the 15S gets into sleep state.
In the design, consider that device is a portable set, volume is more little good more, and power consumption is more little good more.Therefore chip is all selected the chip of little power consumption, and signal pre-processing circuit directly becomes AC signal into direct current signal, reduces the data processing of single-chip microcomputer treatment circuit, thereby reduces the frequency of single-chip microcomputer, reduces the power consumption of single-chip microcomputer.
This device through adopt signal pre-processing circuit to the signal that piezoelectric acceleration sensor transmits amplify, high LPF, integration, effective value detection handle and improved measuring accuracy; Adopt the single-chip microcomputer treatment circuit except vibrating judge through judgement and comparison module are set; Directly outside the output protection action director; Can also better improve measuring accuracy through measurement range selection is set, and reduce power consumption, extension fixture and battery serviceable life etc. through timing shutdown is set.
The beneficial effect of this device also is embodied in:
The function that 1, the auto judge measurement result is arranged, evaluation result are fast, accurately, reliably;
2, OLED shows, brightness is high, in dim environment, also can know demonstration;
3, the measurement result precision is high;
4, little, in light weight, the convenient measurement of volume, advantages of small volume are convenient to measure in narrow and small place;
5, low-power consumption, battery service time is long, stand-by time is long.
Claims (5)
1. written examination device that utilizes piezoelectric effect to measure the rotating machinery double vibrations; Comprise built-in piezoelectric acceleration sensor and booster power supply circuit; It is characterized in that: said piezoelectric acceleration sensor connects signal pre-processing circuit; The signal of piezoelectric acceleration sensor is sent to signal pre-processing circuit carries out filtering signals; Being sent to the A/D change-over circuit after the filtration is digital signal with analog signal conversion, and said A/D change-over circuit connects the single-chip microcomputer treatment circuit, and said single-chip microcomputer treatment circuit comprises judge module, data processing module, measurement data preservation module and passes judgment on comparison module; And demonstration output module; Said demonstration output module connects display circuit, and the importation of said booster power supply circuit connects battery, and output is connected with display circuit with piezoelectric acceleration sensor, signal pre-processing circuit, single-chip microcomputer treatment circuit respectively.
2. the written examination device that utilizes piezoelectric effect to measure the rotating machinery double vibrations as claimed in claim 1; It is characterized in that: said signal pre-processing circuit comprises signal amplification low pass circuit; Integrating amplification circuit and real effective detecting circuit, the signal that piezoelectric acceleration sensor is sent amplifies, become d. c. voltage signal after filtering, integration and the real effective detection is sent to the A/D change-over circuit.
3. the device that utilizes piezoelectric effect to measure the double vibrations of rotating machinery as claimed in claim 1; It is characterized in that: said single-chip microcomputer treatment circuit also comprises measures type selecting module, measurement range selection module and timing shutdown module, and said measurement range selection module is connected with data processing module.
4. the written examination device that utilizes piezoelectric effect to measure the rotating machinery double vibrations as claimed in claim 3; It is characterized in that: device also comprises switch key; Said switch key is connected with the timing shutdown module of said single-chip microcomputer treatment circuit; Said timing shutdown module also is connected with booster power supply circuit with the judge module of single-chip microcomputer treatment circuit respectively, comprises setting-up time shutdown submodule and vibration detection shutdown submodule.
5. the written examination device that utilizes piezoelectric effect to measure the rotating machinery double vibrations as claimed in claim 1 is characterized in that: said display circuit adopts the OLED display circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110404384XA CN102721463A (en) | 2011-12-07 | 2011-12-07 | Written test apparatus for measuring rotating machinery reciprocating vibration by using piezoelectric effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110404384XA CN102721463A (en) | 2011-12-07 | 2011-12-07 | Written test apparatus for measuring rotating machinery reciprocating vibration by using piezoelectric effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102721463A true CN102721463A (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110404384XA Pending CN102721463A (en) | 2011-12-07 | 2011-12-07 | Written test apparatus for measuring rotating machinery reciprocating vibration by using piezoelectric effect |
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| CN (1) | CN102721463A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ306853B6 (en) * | 2016-07-07 | 2017-08-09 | ViDiTech spol. s r.o. | A vibration sensing device |
Citations (4)
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| CN2202308Y (en) * | 1994-12-29 | 1995-06-28 | 四川多恩科技开发有限责任公司 | Portable unified vibration detector with digit displaying |
| CN201004269Y (en) * | 2006-10-25 | 2008-01-09 | 蒋玲莉 | Portable shift and acceleration vibration signal testing system |
| CN201454705U (en) * | 2009-06-15 | 2010-05-12 | 无锡市厚德自动化仪表有限公司 | Vibration protection device for centrifuge |
| CN201607647U (en) * | 2009-11-10 | 2010-10-13 | 无锡市厚德自动化仪表有限公司 | Vibration protecting device |
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| CZ306853B6 (en) * | 2016-07-07 | 2017-08-09 | ViDiTech spol. s r.o. | A vibration sensing device |
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Application publication date: 20121010 |