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 PDF

Info

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
Authority
CN
China
Prior art keywords
circuit
testing machine
value
digital
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CN 87208742
Other languages
Chinese (zh)
Inventor
张永康
黄新
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu qidong electronic instrument factory
JIANGSU BUILDING CONSTRUCTION MACHINARY FACTORY
Original Assignee
Jiangsu qidong electronic instrument factory
JIANGSU BUILDING CONSTRUCTION MACHINARY FACTORY
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu qidong electronic instrument factory, JIANGSU BUILDING CONSTRUCTION MACHINARY FACTORY filed Critical Jiangsu qidong electronic instrument factory
Priority to CN 87208742 priority Critical patent/CN87208742U/en
Publication of CN87208742U publication Critical patent/CN87208742U/en
Expired - Lifetime legal-status Critical Current

Links

Images

Landscapes

  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

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

Digital display for measuring tensile and compressive force of hydraulic test machine
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.
CN 87208742 1987-05-29 1987-05-29 Digital display for measuring tensile and compressive force of hydraulic test machine Expired - Lifetime CN87208742U (en)

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
CN (1) CN87208742U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN201653608U (en) High-intelligent resistance strain gage sensor
CN87208742U (en) Digital display for measuring tensile and compressive force of hydraulic test machine
CN201034580Y (en) Roughness concentration detector based on virtual instrument
CN206258554U (en) Buchholz relay flow velocity setting device
CN208421122U (en) A kind of low-cost and high-precision capacitance measuring device for test equipment
CN2334025Y (en) Jack overload running performance detecting device
CN2230923Y (en) Gas pressure difference meter
CN2031926U (en) Electromechanical type spring testing apparatus with digital display
CN87206643U (en) Electronic botanical nilometer
CN206096265U (en) Portable silicon materials resistivity test device
CN110411332A (en) A kind of system and method for test resistance gauge factor
CN217845958U (en) Tensile calibrating installation of compression-shear testing machine
CN212843954U (en) Force measuring device of cantilever beam type weighing sensor
CN213516164U (en) Force measurement calibration device with automatic data acquisition function
CN2141555Y (en) Positioning gap checking device with electric display for step inclined plane
CN215065777U (en) Side-protecting jack test platform with precision measuring instrument
CN2062836U (en) Pressure tester with single hydraulic pillar
CN2416498Y (en) Improved load measuring gauge
CN2058740U (en) Intelligence strain meter
CN2071704U (en) Portable oil well double-suffocated curve diagnostic instrument
RU10260U1 (en) BEND MEASUREMENT DEVICE
CN201600121U (en) Instrument for measuring strain gages
CN2204046Y (en) Micro coulometer for measuring chloride and inorganic chlorine ion
CN87205253U (en) Computer digital display micrometer
CN2166435Y (en) Head loss measuring apparatus for filter chamber

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CX01 Expiry of patent term