CN87208742U - Digital display for measuring tensile and compressive force of hydraulic test machine - Google Patents
Digital display for measuring tensile and compressive force of hydraulic test machine Download PDFInfo
- Publication number
- CN87208742U CN87208742U CN 87208742 CN87208742U CN87208742U CN 87208742 U CN87208742 U CN 87208742U CN 87208742 CN87208742 CN 87208742 CN 87208742 U CN87208742 U CN 87208742U CN 87208742 U CN87208742 U CN 87208742U
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- testing machine
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- sensor
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Abstract
The utility model relates to a static load material testing machine, belonging to a special electronic instrument which is used for testing applying force value of test specimens by a testing machine for tensile and compressive force. The utility model is mainly characterized in adopting an electrical resistance strain pressure transducer, which has the advantages of simple structure of a complete machine, low cost, high measuring force precision, easy test operation, flexible test operation, etc. The precision of the utility model can reach 0.1 stage, and the series specification is from 0-10N to 0-50000KN.
Description
The utility model relates to and be used to measure fluid pressure type and draw, press testing machine sample to be applied the special electronic instrument of power value---fluid pressure type draws, presses testing machine dynamometry digital indicator.
At present, fluid pressure type draws, presses testing machine manufacturing industry generally to take hydraulic pressure pendulum dynamometry mode or spring dynamometry mode to measure the suffered power value of sample.Also have ZSX-100A type combined type digital display material testing machine in addition, this machine is the combination of 100 ton force hydraulic pressure testing machines and 30 ton force fluid pressure type tension testers, and the hydraulic power supply of two machines is selected a supply by the control desk shunting.What its dynamometric system adopted is resistance-strain type of dynamometer sensor, be installed in as load sensor under the following bearing plate of pressure testing machine, when tested power passes to the sensor pressure head by following bearing plate, this sensor output is proportional to and acts on down on the bearing plate by the voltage of dynamometry, by secondary instrument and digital display system, its test power value is directly read by charactron.Yet they all have problems such as the accuracy requirement of complicated in mechanical structure, machining of dynamometric system is very high, and difficulty of processing is bigger, and test operation is not easy flexibly yet, labour intensity is big, and indicating accuracy is not high.
The purpose of this utility model is the problem at above-mentioned existence, propose a kind of simple in structure, machining accuracy is less demanding, the high and convenient and flexible fluid pressure type of test operation of dynamometry precision draws, presses testing machine dynamometry digital indicator.
Technical solution of the present utility model: mainly formed with power supply and power supply lines by hydraulic system, sensor, small signal amplifier, extensive integrated A/D chip (14433), dynamic scan and display circuit, control circuit, novel peak value maintenance and control circuit, reference source, high-precision low-drift sensor.
The sensor that adopts is a resistance strain type pressure sensor, it is screwed in the testing machine operating cylinder by the connecting thread of itself, when the testing machine hydraulic work system, pressure transducer becomes electric signal with fuel injection pressure signal, this electric signal is admitted to small signal amplifier, signal is amplified into extensive integrated A/D analog to digital conversion circuit, by this circuit the analog quantity electrical signal conversion is become the digital quantity electric signal of corresponding force value (oil pressure value being multiply by the useful area of working piston), demonstrate digital power value by dynamic scan and display circuit again.On the basis of the A/D of double integration principle change-over circuit, add control circuit and S/H circuit and the low comparer formation test peak holding circuit that drifts about, thereby realized that tested sample peak load indicating value keeps, advances test of backhaul indicating value and functions such as power value (KN) and intensity (MPa) switch test.
At the secondary instrument input end, promptly preposition small signal amplifier input port is selected RC network for use, and its circuit is seen accompanying drawing 4.This is in order to overcome the influence of pressure fluctuation signal to power value metering, and specifically in the enforcement of circuit, we are arranged on the operational amplifier input stage with RC network.Obviously this can influence and lose operational amplifier frequency domain and time domain index.This is avoided doing like this in the operational amplifier application circuit design of routine.Yet we do like this and have but brought the effect that reduces the pulsation influence, improves dynamometry precision and stability.
Advance the dynamic error means for correcting of backhaul indicating value and peak load value, it can make the pulsation of input disturb: 0.05 μ * | sin(Wt+ φ) | → 0, it by peak load circuit, gauge tap circuit and continuous coverage advance backhaul indicating value circuit and reference source, A/D analog to digital conversion circuit, dynamic scan display circuit are formed.See accompanying drawing 5.The dynamic error means for correcting has solved because the pulsation error item of hydraulic system 5% can not be overcome fully by RC network, the inconsistency of advancing backhaul indicating value and peak load value the during test that caused.
The S/H circuit is by the Ic shown in the accompanying drawing 3
2, Ic
3, Ic
10, Ic
7Form.Tested voltage is through Ic
1Amplify, signal is the product (V λ KF) of input voltage (V λ) and pregain (KF).This signal slowly rises, Ic
3Output level"1", i.e. Ic
10The B control gate is opened, from Ic
7The control signal of φ end is through Ic
10B, Ic
10A triggers Ic
2Control end makes Ic
2When memory end level is V λ KF, Ic
3Be output as level "0", control gate Ic
10B closes, and Ic
10The D input end is a level"1", TG door Ic
8The c conducting is with Ic
6DU end input signal shorted to earth, at this moment, Ic
6The dynamic scan digital value state of being sent is last test value, thereby has finished tested sample peak load value reservation function.Because Ic
6The Ux end signal is from Ic
1Output terminal, the precision of its precision and S/H circuit is irrelevant, has overcome because the error that the S/H circuit may be introduced is guaranteed measuring accuracy.
Direct-reading shows that commutation circuit is electric capacity in parallel on extensive integrated A/D analog to digital conversion circuit, and is connected in series with a resistance R together.The A/D conversion is undertaken by large scale integrated circuit 14433 double integration circuits.Large scale integrated circuit 14433 can be differentiated input signal polarity automatically, and signal is carried out the forward integration.When integrator during to measured signal (T1) integration, control system is located switch transition automatically to reference voltage (VN).Tested magnitude of voltage obtains digital displaying value by TDC.As long as correct pregain (KF) value of selecting can realize that analog quantity converts the linear power value (KN) or the digital quantity of intensity (MPa) to, calculates and needn't test the back separately.When definite KN value, can realize that the direct-reading of KN and MPa shows switching as long as change reference voltage value (VN).
During test, that we select for use is homemade ZQ-y type 400Kgf/cm
2Resistance strain type pressure sensor, respond well, complete machine structure is simple, and cost is low, easy its precision can reach 0.1 grade flexibly for dynamometry precision height, test operation, and series specification can be from 0~10N to 0~50000KN.As seen, for the realization high precision, the development of the electronics dynamometry universal material tester of value provides good condition energetically.
Accompanying drawing 1 is a structure calcspar of the present utility model.
Accompanying drawing 2 is the utility model schematic diagrams.
Accompanying drawing 3 is continuous wiring diagrams of small signal amplifier, novel retentive control circuit (S/H), extensive A/D chip controls circuit.
Accompanying drawing 4 is RC network wiring diagrams.
Accompanying drawing 5 is dynamic error corrector block diagrams.
A1 in the accompanying drawing 1 is that sensor, A2 are that hydraulic system, A3 are that small signal amplifier, A4 are that extensive integrated A/D chip (14433), A5 are that dynamic scan and display circuit, A6 are that control circuit, A7 are that novel peak value maintenance and control circuit, A8 are that the high-precision low-drift sensor is a power supply lines with power supply, A9.
B1 in the accompanying drawing 5 is that peak load circuit, B2 are into backhaul indicating value circuit, and A6, A4, A5 are with the proof in the accompanying drawing 1.
Claims (3)
1, a kind of by sensor, hydraulic system, small signal amplifier, extensive integrated A/D chip, dynamic scan and display circuit, control circuit, the fluid pressure type that the high-precision low-drift sensor is formed with power supply and power supply lines draws, press testing machine dynamometry digital indicator, it is characterized in that adopting resistance strain type pressure sensor and itself connecting thread is screwed in the testing machine operating cylinder, when the testing machine hydraulic work system, fuel injection pressure signal is sent into small signal amplifier after becoming electric signal by resistance strain type sensor, signal after the amplification enters extensive integrated A/D analog to digital conversion circuit, the digital quantity electric signal that converts corresponding X value to demonstrates digital X value by dynamic scan and display circuit, and novel test peak value retentive control circuit is by control circuit, S/H circuit and low drift comparer are formed; And a RC network is set at the input end of small signal amplifier; The dynamic error means for correcting by peak load circuit, gauge tap circuit, continuous coverage advance backhaul indicating value circuit, reference source and A/D analog to digital conversion circuit, the dynamic scan display circuit is formed.
2, fluid pressure type according to claim 1 draws, presses testing machine dynamometry digital indicator, it is characterized in that direct-reading shows that commutation circuit is that a capacitor C in parallel also is connected in series with resistance R together on the A/D analog to digital conversion circuit.
3, fluid pressure type according to claim 1 draws, presses testing machine dynamometry digital indicator, it is characterized in that the S/H circuit is by Ic
2, Ic
3, Ic
10, Ic
7Form.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 87208742 CN87208742U (en) | 1987-05-29 | 1987-05-29 | Digital display for measuring tensile and compressive force of hydraulic test machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 87208742 CN87208742U (en) | 1987-05-29 | 1987-05-29 | Digital display for measuring tensile and compressive force of hydraulic test machine |
Publications (1)
Publication Number | Publication Date |
---|---|
CN87208742U true CN87208742U (en) | 1988-04-27 |
Family
ID=4823959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 87208742 Expired - Lifetime CN87208742U (en) | 1987-05-29 | 1987-05-29 | Digital display for measuring tensile and compressive force of hydraulic test machine |
Country Status (1)
Country | Link |
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CN (1) | CN87208742U (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100449272C (en) * | 2006-07-31 | 2009-01-07 | 许晓华 | Electric push-rod comprehensive measuring device |
CN101441153B (en) * | 2008-12-23 | 2011-08-31 | 华东理工大学 | Material tester based on system chip |
CN101637901B (en) * | 2008-07-31 | 2011-12-07 | 苏州宝时得电动工具有限公司 | Speed changer |
-
1987
- 1987-05-29 CN CN 87208742 patent/CN87208742U/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100449272C (en) * | 2006-07-31 | 2009-01-07 | 许晓华 | Electric push-rod comprehensive measuring device |
CN101637901B (en) * | 2008-07-31 | 2011-12-07 | 苏州宝时得电动工具有限公司 | Speed changer |
CN101441153B (en) * | 2008-12-23 | 2011-08-31 | 华东理工大学 | Material tester based on system chip |
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Legal Events
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C06 | Publication | ||
PB01 | Publication | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C17 | Cessation of patent right | ||
CX01 | Expiry of patent term |