CN102252790A - Flow adjustable reciprocating pump crankshaft impact load on-line real-time detection device - Google Patents
Flow adjustable reciprocating pump crankshaft impact load on-line real-time detection device Download PDFInfo
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- CN102252790A CN102252790A CN 201110143698 CN201110143698A CN102252790A CN 102252790 A CN102252790 A CN 102252790A CN 201110143698 CN201110143698 CN 201110143698 CN 201110143698 A CN201110143698 A CN 201110143698A CN 102252790 A CN102252790 A CN 102252790A
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- reciprocating pump
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- bent axle
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Abstract
The invention relates to a flow adjustable reciprocating pump crankshaft impact load on-line real-time detection device and belongs to the technical field of mechanical detection. The flow adjustable reciprocating pump crankshaft impact load on-line real-time detection device comprises a metal protective sheet, a resistance strain gage, a strain amplifier, an electrical bridge, a data acquisition card and a control module, wherein the metal protective sheet is arranged in a shell of a reciprocating pump; the resistance strain gage is adhered to a connecting rod to be tested and connected with the electrical bridge and the strain amplifier sequentially, so that deformation of the connecting rod to be tested is converted into an electric signal to be output; the input end of the strain amplifier is connected with the electrical bridge and acquires an analog current signal; the output end of the strain amplifier outputs an analog voltage signal to the data acquisition card; and the output end of the data acquisition card outputs a digital signal to the control module. A method for measuring stress suffered by the connecting rod of the reciprocating pump during work by the resistance strain gage arranged on the connecting rod to indirectly measure the crankshaft stress is utilized for measuring the transient load under the extreme working condition after the pump changes flow, so that a reliable approach is provided for detecting the impact load in real time and on line.
Description
Technical field
What the present invention relates to is a kind of device of mechanical detection technical field, specifically is the flow scalable reciprocating pump bent axle shock load online in real time pick-up unit of a kind of power greater than 400W.
Background technology
Reciprocating pump is a kind of to-and-fro movement of piston in the fluid cylinder working chamber that utilize, and makes the volume of working chamber produce the FLUID TRANSPORTATION pump of periodically variable principle work.Reciprocating pump has that efficient is high and efficiently distinguish widely, and flow is big, characteristics such as pressure height, and pressure changes and influences flow hardly, and the flow that provides is almost constant, thereby is widely used in oil exploitation, fields such as chemical industry high-pressure delivery.Along with improving constantly of the pressure flow demand of deep-well oil-extraction water filling, the reciprocating pump fluid delivery capability is required also to improve constantly, make reciprocating pump to high-power, high pressure, the direction of big flow develops.Bent axle is that structure is the most complicated in the reciprocating pump structure, and the parts that cost is the highest are difficult point places in the research and development design process of high-power reciprocating pump.
In addition, traditional reciprocating pump all is a firm discharge, and in order to satisfy the different needs of carrying operating mode in the commercial Application, reciprocating pump develops to the adjustable direction of flow at present.And under unsteady flow amount operating mode, the reciprocating pump bent axle will be subjected to bigger transient impact load, experiment showed, that the water hammer effect of liquid knockout can increase 50% at the instantaneous peak load that makes.Existing static state or quasistatic bent axle load design and calculation method can't be considered transient impact load, can't satisfy the demand needs of high-power flow scalable reciprocating pump crankshaft designs.In order accurately to check Crankshaft Fatigue Strength, need be after changing flow to pump, the transient state load under the extreme operating condition considers and assesses that for this reason, it is the most reliable method that the size of impact load is carried out the real-time online detection.
Because bent axle is a high-speed rotary part, add many crank throw designs of different angles, shape is very complicated, and the test of its shock load is very difficult.
Find by retrieval prior art, " based on the exploitation of LabVIEW crankshaft fatigue test machine TT﹠C system " (2009 the 25th volume 6-1 phases of " microcomputer information " observing and controlling robotization), the document is set forth a kind of exploitation of new-type crankshaft fatigue test machine TT﹠C system: " bent axle is arranged at initiatively and constitutes mechanical resonance system between the pendulum and slave pendulum, and this system is suspended on the support with wire rope.Computing machine sends sinusoidal digital signal and is converted to simulating signal through data collecting card and sends into power amplifier, promotes vibrator work, and vibrator is added in load initiatively by push rod and lays out.When resonator system was worked under certain resonant frequency, vibrator load was amplified several times by it and is carried in crankshaft two end, bent axle thereby be subjected to periodically moment of flexure effect, the stand under load situation under the simulates real positive activity environment.The slave pendulum below acceleration transducer that is rigidly connected amplifies back input capture card with its vibration signal through charge amplifier and passes to computing machine again and do the data analysis processing." though this experimental machine can test crankshaft fatigue strength; because can't impact load simulate; the result of gained remains a kind of and is in the laboratory, the result ideal conditions under considers deficiency for the suffered in actual applications shock load of bent axle.Therefore need a kind of new device badly the actual condition of bent axle is detected, to check crankshaft fatigue strength as far as possible preparatively.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of flow scalable reciprocating pump bent axle shock load online in real time pick-up unit is provided, utilization is provided with resistance strain gage on connecting rod, test reciprocating pump connecting rod suffered stress when work, record the method for crankshaft stress indirectly, after changing flow, the transient state load extreme operating condition is under tested to pump, for the real-time online detection of shock load provides reliable approach.
The present invention is achieved by the following technical solutions; the present invention includes: the metal coating sheet; resistance strain gage; strain amplifier; electric bridge; data collecting card and control module; wherein: the metal coating sheet is arranged at the housing of reciprocating pump; resistance strain gage is adhered on the connecting rod to be measured and links to each other with strain amplifier with electric bridge successively; the deformation of connecting rod to be measured is converted to electric signal output; the input end of strain amplifier links to each other with electric bridge and gathers analog current signal; the output terminal output analog voltage signal of strain amplifier is to data collecting card, and the output terminal of data collecting card output digital signal is to control module.
Described metal coating sheet is one to have the rectangular planes sheet metal of arc notch, and this metal coating sheet specifically is fixed on the housing fluting place of reciprocating pump.
Described resistance strain gage is connected by cable with electric bridge, and this cable is provided with cable fixer.
Described cable fixer is one or two side hole, and the arch sheet metal of middle circle camber is used for fixing cable.
The surface applied of described resistance strain gage has protection glue, with the protection heat-blocking action.
The resistance value of described resistance strain gage is: 120 Ω, electric quick coefficient: 2.20.
Described data collecting card is 16 tunnel analog inputs, 2 tunnel simulation outputs, and sample frequency: 16,250kS/s.
Described control module comprises: signal processing unit and data record unit, wherein: signal processing unit carries out Filtering Processing by the digital signal that will collect and obtains the strain curve of connecting rod when stressed, and data record unit is connected with signal processing unit and writes down corresponding strain curve.
During measurement, at first reciprocating pump to be measured is fixed on the worktable, should punches on the reciprocating pump housing and conveniently cable be drawn, and slot so that the metal coating sheet to be set, to avoid reciprocating pump its gear when working that the cable strand is disconnected at 5cm place, hole both sides.Treat on the connecting rod to be measured that the position of bonding resistance strain gage should polish, and on connecting rod to be measured, install cable fixer additional with fixed cable.Resistance strain gage is sticked on the rod surface to be measured, insert metering circuit, and armor coated.When tested member is subjected to external force effect distortion, the foil gauge sensitive grid is out of shape thereupon, respective change also takes place in the resistance value of sensitive grid, the size of its variable quantity becomes certain proportionate relationship with the suffered external force of connecting rod to be measured, this variable quantity through after connect measuring bridge and be converted to electric signal output, carry out data acquisition by data collecting card MUSB-6211, the data that collect are handled and record, measurement result is a strain value, by the mechanical relationship of strain and stress, can calculate the size of the suffered stress of tested member.
In the collection result of record, read the minimax strain value, by formula calculate the stress of surveying.
σ
max＝Eε
max，σ
min＝Eε
min
The present invention can be used for the real-time monitoring of the crankshaft stress of automotive reciprocating pump, and recorded data and preservation.By the data of gained are handled and analyzed, can obtain connecting rod in the working stress curve of common operating mode lower link and the temporary impact load that is subjected on the connecting rod, and data obtain the loading spectrum of connecting rod under different operating modes in view of the above.Analytical Calculation in the past relies on experimental formula, and simplifies bent axle is stressed, and the result of gained is accurate inadequately.And, in order to obtain higher safety coefficient, have to add the size of large crankshaft, this also uses the cost of product to improve thereupon.Measure resulting data by this checkout equipment and help carrying out when the crankshaft designs accurate more analytical Calculation, and, obtain model more accurately by carrying out the finite element simulation analog computation.The method for designing that contrast was adopted when designing in the past, more accurate by the connecting rod power that this checkout equipment is waited until, meet the actual condition of reciprocating pump more, help reliability and theoretical property that design improves in enterprise, accelerate the research and development speed of new product, improve competitiveness of product.
Description of drawings
Fig. 1 structural representation of the present invention.
Fig. 2 resistance strain gage and cable etc. are the reciprocating pump side schematic view after setting completed.
Fig. 3 cable fixer synoptic diagram.
The layout synoptic diagram of Fig. 4 resistance strain gage.
The connected mode synoptic diagram of Fig. 5 resistance strain gage.
Fig. 6 group bridging line synoptic diagram.
Fig. 7 control module synoptic diagram.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figures 1 and 2; present embodiment comprises: metal coating sheet 1; resistance strain gage 2; resistance strain gage 2 strain amplifiers 3; electric bridge 4; data collecting card 5 and control module 6; wherein: metal coating sheet 1 is arranged at the housing of reciprocating pump 7; resistance strain gage 2 is adhered on the connecting rod 8 to be measured and links to each other with strain amplifier 3 with electric bridge 4 successively; the deformation of connecting rod 8 to be measured is converted to electric signal output; the input end of strain amplifier 3 links to each other with electric bridge 4 and gathers analog current signal; the output terminal output analog voltage signal of strain amplifier 3 is to data collecting card 5, and the output terminal of data collecting card 5 output digital signal is to control module 6.
Described metal coating sheet 1 is one to have the rectangular planes sheet metal of arc notch, and this metal coating sheet 1 specifically is fixed on the housing fluting place of reciprocating pump 7.
Described resistance strain gage 2 is connected by cable 9 with electric bridge 4, and this cable 9 is provided with cable fixer 10.
Described cable fixer 10 is one or two side hole, and the arch sheet metal of middle circle camber is used for fixing cable 9.
The surface applied of described resistance strain gage 2 has protection glue 11, with the protection heat-blocking action.
The resistance value of described resistance strain gage 2 is: 120 Ω, electric quick coefficient: 2.20.
Described data collecting card 5 is 16 tunnel analog inputs, 2 tunnel simulation outputs, and sample frequency: 16,250kS/s.
Described control module 6 comprises: signal processing unit 12 and data record unit 13, wherein: signal processing unit 12 carries out Filtering Processing by the digital signal that will collect and obtains the strain curve of connecting rod when stressed, and data record unit 13 is connected with signal processing unit 12 and writes down corresponding strain curve.
Resistance strain gage 3 sticks on place to be measured according to certain way, and its pin is connected according to certain way, as Fig. 5 and shown in Figure 6; Use the cable fixer fixed cable after applying protection glue, then cable is inserted electric bridge box YE29003A4.Resistance strain gage 3 is formed the full-bridge connection of relative both arms work, as shown in Figure 5, has 4 resistance strain gages to survey strain in this electric bridge, and 4 resistance strain gages are realized temperature compensation.Thermo-compensator is attached on the material identical with the survey target.Organize the bridging line synoptic diagram as shown in Figure 6, " A " is active gage among the figure, and " D " is compensating plate, 6. connects cable shield.
Electric bridge box YE29003A4 output terminal is connected to strain amplifier YE3817C5.Strain amplifier YE3817C5 is a kind of electric probe device, is used to detect the subtle change of electric signal, and it is amplified to detectable level.Strain amplifier YE3817C5 answered preheating 30 minutes before use.Resistance strain gage 3 is inserted input end, select bridge to press and be 2V, at this moment, unbalance voltage of amplifier output, the shelves that will gain are screwed into " 1K ", and by self-poise button " AUTO ", fine setting " FINE " reaches below the 1mV until amplifier output.Adopt the caliberating device of dynamic strain indicator that strain signal is demarcated then.Each passage of this strain amplifier has 1000 μ ε calibration switches, and timing signal, amplifier bridge are pressed and gain is all necessary and the actual measurement state consistency.If demarcating amplitude is H, the actual value amplitude that records certain collection point A is h, then A point strain value
The output of strain amplifier YE3817C5 is connected to data collecting card M USB-62116.Data collecting card MUSB-62116 is connected on the PC in the control module 7.Open Labview SignalExpress on PC, set up a new Task, the binary channels collection is set, adopt difference Differential mode, the cutoff frequency that wave filter is set is 10Hz.It is Record While Running that View → Recording Options is set, and selects storing path.
The automotive reciprocating pump crankshaft stress online in real time that present embodiment carried out detects, the accuracy of detection height, and can use the Labview groupware to programme as required, enlarge the scope of application.
Claims (6)
1. flow scalable reciprocating pump bent axle shock load online in real time pick-up unit; comprise: the metal coating sheet; resistance strain gage; strain amplifier; electric bridge; data collecting card and control module; it is characterized in that: the metal coating sheet is arranged at the housing of reciprocating pump; resistance strain gage is adhered on the connecting rod to be measured and links to each other with strain amplifier with electric bridge successively; the deformation of connecting rod to be measured is converted to electric signal output; the input end of strain amplifier links to each other with electric bridge and gathers analog current signal; the output terminal output analog voltage signal of strain amplifier is to data collecting card, and the output terminal of data collecting card output digital signal is to control module.
2. flow scalable reciprocating pump bent axle shock load online in real time pick-up unit according to claim 1; it is characterized in that; described metal coating sheet is one to have the rectangular planes sheet metal of arc notch, and this metal coating sheet specifically is fixed on the housing fluting place of reciprocating pump.
3. flow scalable reciprocating pump bent axle shock load online in real time pick-up unit according to claim 1 is characterized in that described resistance strain gage is connected by cable with electric bridge, and this cable is provided with cable fixer.
4. flow scalable reciprocating pump bent axle shock load online in real time pick-up unit according to claim 1 is characterized in that described cable fixer is one or two side hole, and the arch sheet metal of middle circle camber is used for fixing cable.
5. flow scalable reciprocating pump bent axle shock load online in real time pick-up unit according to claim 1 is characterized in that the surface applied of described resistance strain gage has protection glue, with the protection heat-blocking action.
6. flow scalable reciprocating pump bent axle shock load online in real time pick-up unit according to claim 1, it is characterized in that, described control module comprises: signal processing unit and data record unit, wherein: signal processing unit carries out Filtering Processing by the digital signal that will collect and obtains the strain curve of connecting rod when stressed, and data record unit is connected with signal processing unit and writes down corresponding strain curve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101436989A CN102252790B (en) | 2011-05-31 | 2011-05-31 | Flow adjustable reciprocating pump crankshaft impact load on-line real-time detection device |
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| CN2011101436989A CN102252790B (en) | 2011-05-31 | 2011-05-31 | Flow adjustable reciprocating pump crankshaft impact load on-line real-time detection device |
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| CN102252790A true CN102252790A (en) | 2011-11-23 |
| CN102252790B CN102252790B (en) | 2012-11-28 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102542105A (en) * | 2011-12-24 | 2012-07-04 | 中国煤炭科工集团太原研究院 | Gear load wireless monitoring system and interactive multi-stage gear physical simulation method finished based on same |
| CN102564659A (en) * | 2012-01-14 | 2012-07-11 | 江苏舒恒管夹制造有限公司 | Stress monitoring and early warning method and system for prestress ring of cold extrusion mold |
| CN104849030A (en) * | 2014-12-19 | 2015-08-19 | 北汽福田汽车股份有限公司 | Dynamic load testing device for connecting rod |
| CN105769040A (en) * | 2015-12-15 | 2016-07-20 | 深圳市宝乐机器人技术有限公司 | Glass wiping device with resistance strain gauge |
| CN108801531A (en) * | 2018-08-06 | 2018-11-13 | 海伯森技术（深圳）有限公司 | A kind of six-dimension force sensor and the method for improving six-dimension force sensor temperature drift |
| CN111238692A (en) * | 2020-03-11 | 2020-06-05 | 四川建安工业有限责任公司 | Stress monitoring system for automobile chassis parts |
| CN111693198A (en) * | 2020-05-15 | 2020-09-22 | 吉林大学 | Double-plate type six-dimensional force torque sensor |
Families Citing this family (2)
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| US10225026B2 (en) | 2016-06-27 | 2019-03-05 | General Electric Company | System for piston rod monitoring |
| US10200089B2 (en) | 2017-06-07 | 2019-02-05 | General Electric Company | Sensor system and method |
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| CN101046420A (en) * | 2007-04-28 | 2007-10-03 | 西安交通大学 | On-line detection method for transmission torque required by PFC (Power factor correction) of mechanical press |
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Patent Citations (3)
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| DE10006235C1 (en) * | 2000-02-11 | 2001-08-09 | Siemens Ag | Crank-drive mechanism for internal (IC) combustion engine - uses piezoresitive or capacitive strain-sensor or surface- wave component as force-sensor mounted on push-rod |
| KR20060063079A (en) * | 2004-12-07 | 2006-06-12 | 현대자동차주식회사 | Stress testing apparatus of the crank pin's fillet |
| CN101046420A (en) * | 2007-04-28 | 2007-10-03 | 西安交通大学 | On-line detection method for transmission torque required by PFC (Power factor correction) of mechanical press |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102542105A (en) * | 2011-12-24 | 2012-07-04 | 中国煤炭科工集团太原研究院 | Gear load wireless monitoring system and interactive multi-stage gear physical simulation method finished based on same |
| CN102542105B (en) * | 2011-12-24 | 2013-07-24 | 中国煤炭科工集团太原研究院 | Gear load wireless monitoring system and interactive multi-stage gear physical simulation method finished based on same |
| CN102564659A (en) * | 2012-01-14 | 2012-07-11 | 江苏舒恒管夹制造有限公司 | Stress monitoring and early warning method and system for prestress ring of cold extrusion mold |
| CN102564659B (en) * | 2012-01-14 | 2014-09-10 | 江苏舒恒管夹制造有限公司 | Stress monitoring and early warning method and system for prestress ring of cold extrusion mold |
| CN104849030A (en) * | 2014-12-19 | 2015-08-19 | 北汽福田汽车股份有限公司 | Dynamic load testing device for connecting rod |
| CN105769040A (en) * | 2015-12-15 | 2016-07-20 | 深圳市宝乐机器人技术有限公司 | Glass wiping device with resistance strain gauge |
| CN108801531A (en) * | 2018-08-06 | 2018-11-13 | 海伯森技术（深圳）有限公司 | A kind of six-dimension force sensor and the method for improving six-dimension force sensor temperature drift |
| CN108801531B (en) * | 2018-08-06 | 2024-03-22 | 海伯森技术（深圳）有限公司 | Six-dimensional force sensor and method for improving temperature drift of six-dimensional force sensor |
| CN111238692A (en) * | 2020-03-11 | 2020-06-05 | 四川建安工业有限责任公司 | Stress monitoring system for automobile chassis parts |
| CN111693198A (en) * | 2020-05-15 | 2020-09-22 | 吉林大学 | Double-plate type six-dimensional force torque sensor |
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| CN102252790B (en) | 2012-11-28 |
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Address after: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee after: Shanghai Jiao Tong University Patentee after: MILTON INDUSTRIAL EQUIPMENT (SHANGHAI) CO., LTD. Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Shanghai Jiao Tong University Patentee before: Hamilton-Sundstrand Induxtrial (Shanghai) Co., Ltd. |
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Granted publication date: 20121128 Termination date: 20190531 |
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