CN203414049U - Slow tension test crack propagation length data acquisition device - Google Patents
Slow tension test crack propagation length data acquisition device Download PDFInfo
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- CN203414049U CN203414049U CN201320551774.4U CN201320551774U CN203414049U CN 203414049 U CN203414049 U CN 203414049U CN 201320551774 U CN201320551774 U CN 201320551774U CN 203414049 U CN203414049 U CN 203414049U
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Abstract
The utility model discloses a slow tension test crack propagation length data acquisition device which comprises a current input probe used for inputting current to a compact tension specimen, a voltage output probe used for detecting voltages across a crack surface of the compact tension specimen, a constant current source and an AC-DC converter circuit module. An output end of the constant current source is connected with a current reversing circuit module through a current-limiting rheostat. The current input probe is connected with an output end of the current reversing circuit module. The voltage output probe is connected with a data acquisition system. the data acquisition system comprises an amplifying circuit module, an A/D converter circuit module, a microprocessor module and a communication interface circuit module used for being connected to a data processing computer. The amplifying circuit module is connected with a zeroing circuit module. The device provided by the utility model is designed reasonably, is convenient to implement, requires low cost, is convenient to operate, has high operational reliability, high stability, strong anti-jamming capability, high data acquisition accuracy, high sensitivity and strong practicality, and is convenient for popularization and use.
Description
Technical field
The utility model relates to metal material crackle technical field of measurement and test, especially relates to a kind of slow tension test crack extending length data collector.
Background technology
At present, potential method detects crack length and adopts AC power as driving source, applies the electric field of a selected frequency in testee, and the variable quantity of crack length is to this selected frequency amplitude modulation, systematic survey be alternating current potential difference.Yet in ac potential method, the voltage height of probe output is according to material behavior conductance, magnetic permeability and difference, before test, need to compensate the impact of other different electrical conductances and magnetic conductance for this reason, workload is large, and because the influence factor that has magnetic conductance in ac-excited source cannot be eliminated, the accuracy of measurement result is reduced greatly.In addition, the measurement mechanism of ac potential method is complicated, and technical difficulty is large, and instrument expense is more expensive, causes the demarcation more complicated of measurement result.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, and a kind of slow tension test crack extending length data collector is provided, and it is simple in structure, rationally novel in design, realization is convenient and cost is low, uses easy to operate, functional reliability is high, stability is high, and antijamming capability is strong, and accuracy of data acquisition is high, highly sensitive, practical, result of use is good, is convenient to promote the use of.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of slow tension test crack extending length data collector, it is characterized in that: comprise for two electric current input probes toward compact tensile specimen input current and pop one's head in for detection of two Voltage-outputs of compact tensile specimen crack surface both end voltage, and be the constant current source of electric current input probe power supply and the ac-dc converter circuit module that is converted to each electricity consumption module required voltage of measurement mechanism for the alternating current that AC power is exported as driving source, the output terminal of described constant current source is connected to electric current commutating circuit module by current limliting rheostat, the output terminal of described electric current input probe and described electric current commutating circuit module joins, on described Voltage-output probe, be connected to data acquisition system (DAS), described data acquisition system (DAS) comprises the amplifying circuit module of joining successively, A/D change-over circuit module, microprocessor module and communication interface circuit module, in described amplifying circuit module, be connected to zeroing circuit module.
Above-mentioned slow tension test crack extending length data collector, is characterized in that: described constant current source is that output current is the constant current source of 0～50A.
Above-mentioned slow tension test crack extending length data collector, is characterized in that: described ac-dc converter circuit module comprises transformer T1 diode D11, D12, D13 and D14, and capacitor C 2, C3, C4 and C5, the two ends of the primary winding of described transformer T1 are corresponding respectively to join with two output terminals of AC power, the negative pole of the positive pole of one end of the secondary coil of described transformer T1 and diode D13 and diode D14 joins, the negative pole of the positive pole of the other end of the secondary coil of described transformer T1 and diode D11 and diode D12 joins, the centre tap ground connection of the secondary coil of described transformer T1, the negative pole of described diode D11, the negative pole of diode D13, one end of one end of capacitor C 5 and capacitor C 3 joins and is the VCC output terminal of described ac-dc converter circuit module, the positive pole of described diode D12, the positive pole of diode D14, one end of one end of capacitor C 2 and capacitor C 4 joins and is the VEE output terminal of described ac-dc converter circuit module, the equal ground connection of the other end of the other end of described capacitor C 5 and capacitor C 2, the other end of the other end of described capacitor C 3 and capacitor C 4 joins.
Above-mentioned slow tension test crack extending length data collector, it is characterized in that: described current limliting rheostat is slide rheostat R5, described electric current commutating circuit module by pwm signal generator and the current switching control circuit module composition that joins with pwm signal generator, described current switching control circuit module comprises resistance R 1, R2, R3 and R4, triode Q1, Q2, Q3, Q4, Q5 and Q6, and diode D5, D6, D7 and D8, the first signal output terminal PWM1 of one end of described resistance R 1 and pwm signal generator joins, the base stage of the other end of described resistance R 1 and triode Q1 is joined, one end of the collector of described triode Q1 and resistance R 3, the base stage of the base stage of triode Q5 and triode Q6 is joined, the secondary signal output terminal PWM2 of one end of described resistance R 2 and pwm signal generator joins, the base stage of the other end of described resistance R 2 and triode Q2 is joined, one end of the collector of described triode Q2 and resistance R 4, the base stage of the base stage of triode Q3 and triode Q4 is joined, the other end of the other end of described resistance R 3 and resistance R 4 all joins with the VCC output terminal of ac-dc converter circuit module, the equal ground connection of emitter of the emitter of described triode Q1 and triode Q2, the collector of described triode Q3, the negative pole of diode D5, the collector of the negative pole of diode D7 and triode Q5 all joins with a stiff end of slide rheostat R5, the sliding end of described slide rheostat R5 and the output terminal of described constant current source join, the emitter of described triode Q3, the positive pole of diode D5, the negative pole of the emitter of triode Q4 and diode D6 be described electric current commutating circuit module the first output terminal and with two electric current input probes in one of them join, the emitter of described triode Q5, the positive pole of diode D7, the negative pole of the emitter of triode Q6 and diode D8 be described electric current commutating circuit module the second output terminal and with two electric current input probes in another join, the collector of described triode Q4, the positive pole of diode D6, the equal ground connection of collector of the positive pole of diode D8 and triode Q6.
Above-mentioned slow tension test crack extending length data collector, it is characterized in that: described amplifying circuit module comprises chopping zero-stabilizing operational amplifier ICL7650, high precision operating amplifier LM725, universal operational amplifier LM741, commutation diode D1 and D2, resistance R 6, R7, R8, R9, R10, R11, R12, R13 and R14, and slide rheostat R15 and capacitor C 1, one of them in one end of described resistance R 11 and two Voltage-output probes joined, the positive pole of the other end of described resistance R 11 and commutation diode D1, the negative pole of commutation diode D2, the 2nd pin of one end of resistance R 12 and chopping zero-stabilizing operational amplifier ICL7650 joins, another in the 3rd pin of described chopping zero-stabilizing operational amplifier ICL7650 and two Voltage-output probes, the positive pole of the negative pole of commutation diode D1 and commutation diode D2 joins, the 1st pin of described chopping zero-stabilizing operational amplifier ICL7650 and a stiff end of slide rheostat R15 join, the 8th pin of described chopping zero-stabilizing operational amplifier ICL7650 and another stiff end of slide rheostat R15 join, the VCC output terminal of the sliding end of described slide rheostat R15 and ac-dc converter circuit module joins, the 6th pin of described chopping zero-stabilizing operational amplifier ICL7650 joins with the other end of resistance R 12 and one end of resistance R 14, the 4th pin of described chopping zero-stabilizing operational amplifier ICL7650 and the VEE output terminal of ac-dc converter circuit module join, the 7th pin of described chopping zero-stabilizing operational amplifier ICL7650 and the VCC output terminal of ac-dc converter circuit module join, the 2nd pin of described high precision operating amplifier LM725 and the other end of resistance R 14, one end of one end of resistance R 13 and capacitor C 1 joins, the 3rd pin of described high precision operating amplifier LM725 is by resistance R 7 ground connection, the 4th pin of described high precision operating amplifier LM725 and the VEE output terminal of ac-dc converter circuit module join, the 6th pin of described high precision operating amplifier LM725 and the other end of resistance R 13, one end of the other end of capacitor C 1 and resistance R 6 joins, the 7th pin of described high precision operating amplifier LM725 and the VCC output terminal of ac-dc converter circuit module join, the 2nd pin of described universal operational amplifier LM741 and the other end of resistance R 6, one end of one end of resistance R 8 and resistance R 9 joins, the other end of described resistance R 9 and zeroing circuit module are joined, the 3rd pin of described universal operational amplifier LM741 is by resistance R 10 ground connection, the 4th pin of described universal operational amplifier LM741 and the VEE output terminal of ac-dc converter circuit module join, the 6th pin of described universal operational amplifier LM741 and the other end of resistance R 8 joins and be the signal output part OUT of described amplifying circuit module, the 7th pin of described universal operational amplifier LM741 and the VCC output terminal of ac-dc converter circuit module join.
Above-mentioned slow tension test crack extending length data collector, it is characterized in that: described zeroing circuit module is by resistance R 16, R17, R18, R19, R20 and R21 and slide rheostat R22 form, the sliding end of described slide rheostat R22 is the input end IN of described zeroing circuit module and joins with described amplifying circuit module, stiff end of described slide rheostat R22 and one end of resistance R 18 join, one end of one end of the other end of described resistance R 18 and resistance R 16 and resistance R 20 joins, the VCC output terminal of the other end of described resistance R 16 and ac-dc converter circuit module joins, another stiff end of described slide rheostat R22 and one end of resistance R 19 join, one end of one end of the other end of described resistance R 19 and resistance R 17 and resistance R 21 joins, the VEE output terminal of the other end of described resistance R 17 and ac-dc converter circuit module joins, the equal ground connection of the other end of the other end of described resistance R 20 and resistance R 21.
The utility model compared with prior art has the following advantages:
1, the utility model is simple in structure, rationally novel in design, and realization is convenient and cost is low.
2, the utility model adopts DC source of energization, has not only eliminated many external interference factors, and easy to operate, can continuous working, and the expansion of crackle is carried out to Real-time Collection.
3, the utility model is by arranging electric current commutating circuit module, can be the cancellation that affects of thermopower and chopping zero-stabilizing operational amplifier ICL7650, high precision operating amplifier LM725 and universal operational amplifier LM741 zero shift, eliminate the error that in direct current signal, unnecessary interference potential brings, and reduced the impact of thermoelectric effect on measurement result.
4, the antijamming capability of the utility model amplifying circuit module is strong, and temperature drift is extremely low, has improved functional reliability of the present utility model, stability and antijamming capability.
5, the utility model can rationally reduce the error that measuring method and instrument itself bring, and accuracy of data acquisition is high, highly sensitive.
6, of the present utility model practical, result of use is good, is convenient to promote the use of.
In sum, the utility model is simple in structure, rationally novel in design, and realization is convenient and cost is low, uses easy to operate, functional reliability is high, and stability is high, and antijamming capability is strong, and accuracy of data acquisition is high, highly sensitive, practical, result of use is good, is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is annexation schematic diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model ac-dc converter circuit module.
Fig. 3 is the circuit theory diagrams of the utility model constant current source, current limliting rheostat and electric current commutating circuit module.
Fig. 4 is the circuit theory diagrams of the utility model amplifying circuit module.
Fig. 5 is the circuit theory diagrams of the utility model zeroing circuit module.
Description of reference numerals:
1-electric current input probe; 2-Voltage-output probe; 3-constant current source;
4-ac-dc converter circuit module; 5-electric current commutating circuit module;
5-1-pwm signal generator; 5-2-current switching control circuit module;
6-amplifying circuit module; 7-A/D change-over circuit module; 8-microprocessor module;
9-communication interface circuit module; 10-zeroing circuit module; 11-compact tensile specimen;
12-AC power; 13-current limliting rheostat.
Embodiment
As shown in Figure 1, the utility model comprises for two electric current input probes 1 toward compact tensile specimen 11 input currents and pops one's head in 2 for detection of two Voltage-outputs of compact tensile specimen 11 crack surface both end voltage, and be the constant current source 3 of electric current input probe 1 power supply and the ac-dc converter circuit module 4 that is converted to each electricity consumption module required voltage of measurement mechanism for the alternating current that AC power 12 is exported as driving source, the output terminal of described constant current source 3 is connected to electric current commutating circuit module 5 by current limliting rheostat 13, described electric current input probe 1 joins with the output terminal of described electric current commutating circuit module 5, on described Voltage-output probe 2, be connected to data acquisition system (DAS), described data acquisition system (DAS) comprises the amplifying circuit module 6 of joining successively, A/D change-over circuit module 7, microprocessor module 8 and communication interface circuit module 9, in described amplifying circuit module 6, be connected to zeroing circuit module 10.Wherein, described communication interface circuit module 9 is connected and communicates by letter for the data handling machine with carrying out data processing.
In the present embodiment, the constant current source that described constant current source 3 is 0～50A for output current.
As shown in Figure 2, in the present embodiment, described ac-dc converter circuit module 4 comprises transformer T1, diode D11, D12, D13 and D14, and capacitor C 2, C3, C4 and C5, the two ends of the primary winding of described transformer T1 are corresponding respectively to join with two output terminals of AC power 12, the negative pole of the positive pole of one end of the secondary coil of described transformer T1 and diode D13 and diode D14 joins, the negative pole of the positive pole of the other end of the secondary coil of described transformer T1 and diode D11 and diode D12 joins, the centre tap ground connection of the secondary coil of described transformer T1, the negative pole of described diode D11, the negative pole of diode D13, one end of one end of capacitor C 5 and capacitor C 3 joins and is the VCC output terminal of described ac-dc converter circuit module 4, the positive pole of described diode D12, the positive pole of diode D14, one end of one end of capacitor C 2 and capacitor C 4 joins and is the VEE output terminal of described ac-dc converter circuit module 4, the equal ground connection of the other end of the other end of described capacitor C 5 and capacitor C 2, the other end of the other end of described capacitor C 3 and capacitor C 4 joins.Wherein, the output of the VCC output terminal of described ac-dc converter circuit module 4 is+12V voltage that what the VEE output terminal of described ac-dc converter circuit module 4 was exported is-12V voltage.
As shown in Figure 3, in the present embodiment, described current limliting rheostat 13 is that slide rheostat R5, described electric current commutating circuit module 5 form by pwm signal generator 5-1 with the current switching control circuit module 5-2 that pwm signal generator 5-1 joins, described current switching control circuit module 5-2 comprises resistance R 1, R2, R3 and R4, triode Q1, Q2, Q3, Q4, Q5 and Q6, and diode D5, D6, D7 and D8, the first signal output terminal PWM1 of one end of described resistance R 1 and pwm signal generator 5-1 joins, the base stage of the other end of described resistance R 1 and triode Q1 is joined, one end of the collector of described triode Q1 and resistance R 3, the base stage of the base stage of triode Q5 and triode Q6 is joined, the secondary signal output terminal PWM2 of one end of described resistance R 2 and pwm signal generator 5-1 joins, the base stage of the other end of described resistance R 2 and triode Q2 is joined, one end of the collector of described triode Q2 and resistance R 4, the base stage of the base stage of triode Q3 and triode Q4 is joined, the other end of the other end of described resistance R 3 and resistance R 4 all joins with the VCC output terminal of ac-dc converter circuit module 4, the equal ground connection of emitter of the emitter of described triode Q1 and triode Q2, the collector of described triode Q3, the negative pole of diode D5, the collector of the negative pole of diode D7 and triode Q5 all joins with a stiff end of slide rheostat R5, the output terminal of the sliding end of described slide rheostat R5 and described constant current source 3 joins, the emitter of described triode Q3, the positive pole of diode D5, the negative pole of the emitter of triode Q4 and diode D6 be described electric current commutating circuit module 5 the first output terminal and with two electric current input probes 1 in one of them join, the emitter of described triode Q5, the positive pole of diode D7, the negative pole of the emitter of triode Q6 and diode D8 be described electric current commutating circuit module 5 the second output terminal and with two electric current input probes 1 in another join, the collector of described triode Q4, the positive pole of diode D6, the equal ground connection of collector of the positive pole of diode D8 and triode Q6.When the first signal output terminal PWM1 of pwm signal generator 5-1 output high level, triode Q3 and Q6 connect, and electric current is right from the left flow direction, when the secondary signal output terminal PWM2 of pwm signal generator 5-1 output high level, triode Q4 and Q5 connect, and electric current is left from the right flow direction.
As shown in Figure 4, in the present embodiment, described amplifying circuit module 6 comprises chopping zero-stabilizing operational amplifier ICL7650, high precision operating amplifier LM725, universal operational amplifier LM741, commutation diode D1 and D2, resistance R 6, R7, R8, R9, R10, R11, R12, R13 and R14, and slide rheostat R15 and capacitor C 1, one of them in one end of described resistance R 11 and two Voltage-output probes 2 joined, the positive pole of the other end of described resistance R 11 and commutation diode D1, the negative pole of commutation diode D2, the 2nd pin of one end of resistance R 12 and chopping zero-stabilizing operational amplifier ICL7650 joins, another in the 3rd pin of described chopping zero-stabilizing operational amplifier ICL7650 and two Voltage-output probes 2, the positive pole of the negative pole of commutation diode D1 and commutation diode D2 joins, the 1st pin of described chopping zero-stabilizing operational amplifier ICL7650 and a stiff end of slide rheostat R15 join, the 8th pin of described chopping zero-stabilizing operational amplifier ICL7650 and another stiff end of slide rheostat R15 join, the VCC output terminal of the sliding end of described slide rheostat R15 and ac-dc converter circuit module 4 joins, the 6th pin of described chopping zero-stabilizing operational amplifier ICL7650 joins with the other end of resistance R 12 and one end of resistance R 14, the 4th pin of described chopping zero-stabilizing operational amplifier ICL7650 and the VEE output terminal of ac-dc converter circuit module 4 join, the 7th pin of described chopping zero-stabilizing operational amplifier ICL7650 and the VCC output terminal of ac-dc converter circuit module 4 join, the 2nd pin of described high precision operating amplifier LM725 and the other end of resistance R 14, one end of one end of resistance R 13 and capacitor C 1 joins, the 3rd pin of described high precision operating amplifier LM725 is by resistance R 7 ground connection, the 4th pin of described high precision operating amplifier LM725 and the VEE output terminal of ac-dc converter circuit module 4 join, the 6th pin of described high precision operating amplifier LM725 and the other end of resistance R 13, one end of the other end of capacitor C 1 and resistance R 6 joins, the 7th pin of described high precision operating amplifier LM725 and the VCC output terminal of ac-dc converter circuit module 4 join, the 2nd pin of described universal operational amplifier LM741 and the other end of resistance R 6, one end of one end of resistance R 8 and resistance R 9 joins, the other end of described resistance R 9 and zeroing circuit module 10 are joined, the 3rd pin of described universal operational amplifier LM741 is by resistance R 10 ground connection, the 4th pin of described universal operational amplifier LM741 and the VEE output terminal of ac-dc converter circuit module 4 join, the 6th pin of described universal operational amplifier LM741 and the other end of resistance R 8 joins and be the signal output part OUT of described amplifying circuit module 6, the 7th pin of described universal operational amplifier LM741 and the VCC output terminal of ac-dc converter circuit module 4 join.Wherein, commutation diode D1 and D2 are for the protection of chopping zero-stabilizing operational amplifier ICL7650.Chopping zero-stabilizing operational amplifier ICL7650 is that Intersil company utilizes dynamic school zero technology and CMOS technique to make, it have input bias current little, lack of proper care little, high, the common mode inhibition capacity of gaining is strong, response is fast, temperature drift is low, stable performance and the advantage such as cheap, by chopping zero-stabilizing operational amplifier ICL7650 stability and the antijamming capability of control circuit effectively.High precision operating amplifier LM725 is a kind of for requiring the high performance operational amplifier of the low drift of low noise and high precision closed loop gain application, has zero imbalance and output short circuit protection ability.Universal operational amplifier LM741 is high gain operational amplifier, has the free operational function of output short circuit protection and locking.
As shown in Figure 5, in the present embodiment, described zeroing circuit module 10 is by resistance R 16, R17, R18, R19, R20 and R21 and slide rheostat R22 form, the sliding end of described slide rheostat R22 is the input end IN of described zeroing circuit module 10 and joins with described amplifying circuit module 6, stiff end of described slide rheostat R22 and one end of resistance R 18 join, one end of one end of the other end of described resistance R 18 and resistance R 16 and resistance R 20 joins, the VCC output terminal of the other end of described resistance R 16 and ac-dc converter circuit module 4 joins, another stiff end of described slide rheostat R22 and one end of resistance R 19 join, one end of one end of the other end of described resistance R 19 and resistance R 17 and resistance R 21 joins, the VEE output terminal of the other end of described resistance R 17 and ac-dc converter circuit module 4 joins, the equal ground connection of the other end of the other end of described resistance R 20 and resistance R 21.Described zeroing circuit module 10 is initial value for zeroing with before compensating crack extesion.
Principle of work of the present utility model and the work course of work are: the constant current source 3 of high stable is 1 power supply of electric current input probe as driving source, before electric current enters compact tensile specimen 11 by two electric current input probes 1, by current limliting rheostat 13, control the size of electric currents, and can short circuit while guaranteeing compact tensile specimen 11 fracture.Potential method itself is due to heating effect of current and the certain interference of electrical devices connection meeting generation, in order to reduce disturbing factor, be provided with electric current commutating circuit module 5, every 0.5S, electric current is reverse, it is very short that adjacent forward and reverse reading differ the time, can, the cancellation that affects of thermopower and chopping zero-stabilizing operational amplifier ICL7650, high precision operating amplifier LM725 and universal operational amplifier LM741 zero shift, eliminate the error that in direct current signal, unnecessary interference potential brings.After electric current enters compact tensile specimen 11, expansion along with crackle, current lead-through cross section constantly dwindles, resistance constantly increases, under constant electric current, the voltage drop at crack surface two ends will increase along with the increase of crack size, output microvolt other voltage of level also amplifies through amplifying circuit module 6 successively, A/D change-over circuit module 7 carries out exporting to microprocessor module 8 after A/D conversion, the data that microprocessor module 8 is received are again transferred to data handling machine by communication interface circuit module 9, so that data handling machine is further analyzed processing to data, finally obtain crack extending length.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every any simple modification of above embodiment being done according to the utility model technical spirit, change and equivalent structure change, and all still belong in the protection domain of technical solutions of the utility model.
Claims (6)
1. a slow tension test crack extending length data collector, it is characterized in that: comprise for toward two electric current input probes (1) of compact tensile specimen (11) input current with for detection of two Voltage-outputs of compact tensile specimen (11) crack surface both end voltage pop one's head in (2), and be the constant current source (3) of electric current input probe (1) power supply and the ac-dc converter circuit module (4) that is converted to each electricity consumption module required voltage of measurement mechanism for the alternating current that AC power (12) is exported as driving source, the output terminal of described constant current source (3) is connected to electric current commutating circuit module (5) by current limliting rheostat (13), described electric current input probe (1) joins with the output terminal of described electric current commutating circuit module (5), on described Voltage-output probe (2), be connected to data acquisition system (DAS), described data acquisition system (DAS) comprises the amplifying circuit module (6) of joining successively, A/D change-over circuit module (7), microprocessor module (8) and communication interface circuit module (9), in described amplifying circuit module (6), be connected to zeroing circuit module (10).
2. according to slow tension test crack extending length data collector claimed in claim 1, it is characterized in that: the constant current source that described constant current source (3) is 0～50A for output current.
3. according to slow tension test crack extending length data collector claimed in claim 1, it is characterized in that: described ac-dc converter circuit module (4) comprises transformer T1 diode D11, D12, D13 and D14, and capacitor C 2, C3, C4 and C5, the two ends of the primary winding of described transformer T1 are corresponding respectively to join with two output terminals of AC power (12), the negative pole of the positive pole of one end of the secondary coil of described transformer T1 and diode D13 and diode D14 joins, the negative pole of the positive pole of the other end of the secondary coil of described transformer T1 and diode D11 and diode D12 joins, the centre tap ground connection of the secondary coil of described transformer T1, the negative pole of described diode D11, the negative pole of diode D13, one end of one end of capacitor C 5 and capacitor C 3 joins and is the VCC output terminal of described ac-dc converter circuit module (4), the positive pole of described diode D12, the positive pole of diode D14, one end of one end of capacitor C 2 and capacitor C 4 joins and is the VEE output terminal of described ac-dc converter circuit module (4), the equal ground connection of the other end of the other end of described capacitor C 5 and capacitor C 2, the other end of the other end of described capacitor C 3 and capacitor C 4 joins.
4. according to slow tension test crack extending length data collector claimed in claim 3, it is characterized in that: described current limliting rheostat (13) is that slide rheostat R5, described electric current commutating circuit module (5) form by pwm signal generator (5-1) with the current switching control circuit module (5-2) that pwm signal generator (5-1) joins, described current switching control circuit module (5-2) comprises resistance R 1, R2, R3 and R4, triode Q1, Q2, Q3, Q4, Q5 and Q6, and diode D5, D6, D7 and D8, the first signal output terminal PWM1 of one end of described resistance R 1 and pwm signal generator (5-1) joins, the base stage of the other end of described resistance R 1 and triode Q1 is joined, one end of the collector of described triode Q1 and resistance R 3, the base stage of the base stage of triode Q5 and triode Q6 is joined, the secondary signal output terminal PWM2 of one end of described resistance R 2 and pwm signal generator (5-1) joins, the base stage of the other end of described resistance R 2 and triode Q2 is joined, one end of the collector of described triode Q2 and resistance R 4, the base stage of the base stage of triode Q3 and triode Q4 is joined, the other end of the other end of described resistance R 3 and resistance R 4 all joins with the VCC output terminal of ac-dc converter circuit module (4), the equal ground connection of emitter of the emitter of described triode Q1 and triode Q2, the collector of described triode Q3, the negative pole of diode D5, the collector of the negative pole of diode D7 and triode Q5 all joins with a stiff end of slide rheostat R5, the output terminal of the sliding end of described slide rheostat R5 and described constant current source (3) joins, the emitter of described triode Q3, the positive pole of diode D5, the negative pole of the emitter of triode Q4 and diode D6 be described electric current commutating circuit module (5) the first output terminal and with two electric current input probes (1) in one of them join, the emitter of described triode Q5, the positive pole of diode D7, the negative pole of the emitter of triode Q6 and diode D8 be described electric current commutating circuit module (5) the second output terminal and with two electric current input probes (1) in another join, the collector of described triode Q4, the positive pole of diode D6, the equal ground connection of collector of the positive pole of diode D8 and triode Q6.
5. according to slow tension test crack extending length data collector claimed in claim 3, it is characterized in that: described amplifying circuit module (6) comprises chopping zero-stabilizing operational amplifier ICL7650, high precision operating amplifier LM725, universal operational amplifier LM741, commutation diode D1 and D2, resistance R 6, R7, R8, R9, R10, R11, R12, R13 and R14, and slide rheostat R15 and capacitor C 1, one of them in one end of described resistance R 11 and two Voltage-output probes (2) joined, the positive pole of the other end of described resistance R 11 and commutation diode D1, the negative pole of commutation diode D2, the 2nd pin of one end of resistance R 12 and chopping zero-stabilizing operational amplifier ICL7650 joins, another in the 3rd pin of described chopping zero-stabilizing operational amplifier ICL7650 and two Voltage-output probes (2), the positive pole of the negative pole of commutation diode D1 and commutation diode D2 joins, the 1st pin of described chopping zero-stabilizing operational amplifier ICL7650 and a stiff end of slide rheostat R15 join, the 8th pin of described chopping zero-stabilizing operational amplifier ICL7650 and another stiff end of slide rheostat R15 join, the VCC output terminal of the sliding end of described slide rheostat R15 and ac-dc converter circuit module (4) joins, the 6th pin of described chopping zero-stabilizing operational amplifier ICL7650 joins with the other end of resistance R 12 and one end of resistance R 14, the 4th pin of described chopping zero-stabilizing operational amplifier ICL7650 and the VEE output terminal of ac-dc converter circuit module (4) join, the 7th pin of described chopping zero-stabilizing operational amplifier ICL7650 and the VCC output terminal of ac-dc converter circuit module (4) join, the 2nd pin of described high precision operating amplifier LM725 and the other end of resistance R 14, one end of one end of resistance R 13 and capacitor C 1 joins, the 3rd pin of described high precision operating amplifier LM725 is by resistance R 7 ground connection, the 4th pin of described high precision operating amplifier LM725 and the VEE output terminal of ac-dc converter circuit module (4) join, the 6th pin of described high precision operating amplifier LM725 and the other end of resistance R 13, one end of the other end of capacitor C 1 and resistance R 6 joins, the 7th pin of described high precision operating amplifier LM725 and the VCC output terminal of ac-dc converter circuit module (4) join, the 2nd pin of described universal operational amplifier LM741 and the other end of resistance R 6, one end of one end of resistance R 8 and resistance R 9 joins, the other end of described resistance R 9 and zeroing circuit module (10) are joined, the 3rd pin of described universal operational amplifier LM741 is by resistance R 10 ground connection, the 4th pin of described universal operational amplifier LM741 and the VEE output terminal of ac-dc converter circuit module (4) join, the 6th pin of described universal operational amplifier LM741 and the other end of resistance R 8 joins and be the signal output part OUT of described amplifying circuit module (6), the 7th pin of described universal operational amplifier LM741 and the VCC output terminal of ac-dc converter circuit module (4) join.
6. according to slow tension test crack extending length data collector claimed in claim 3, it is characterized in that: described zeroing circuit module (10) is by resistance R 16, R17, R18, R19, R20 and R21 and slide rheostat R22 form, the sliding end of described slide rheostat R22 is the input end IN of described zeroing circuit module (10) and joins with described amplifying circuit module (6), stiff end of described slide rheostat R22 and one end of resistance R 18 join, one end of one end of the other end of described resistance R 18 and resistance R 16 and resistance R 20 joins, the VCC output terminal of the other end of described resistance R 16 and ac-dc converter circuit module (4) joins, another stiff end of described slide rheostat R22 and one end of resistance R 19 join, one end of one end of the other end of described resistance R 19 and resistance R 17 and resistance R 21 joins, the VEE output terminal of the other end of described resistance R 17 and ac-dc converter circuit module (4) joins, the equal ground connection of the other end of the other end of described resistance R 20 and resistance R 21.
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| CN201320551774.4U CN203414049U (en) | 2013-09-05 | 2013-09-05 | Slow tension test crack propagation length data acquisition device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994715A (en) * | 2014-06-04 | 2014-08-20 | 宁波市鄞州富春精密铸造有限公司 | Device and method for measuring minimum diameter of diameter shrinkage portion of tensile sample after fracture |
| CN104198281A (en) * | 2014-08-13 | 2014-12-10 | 中国石油天然气集团公司 | Data acquisition system of wide plate tension test machine |
| CN106989844A (en) * | 2017-04-26 | 2017-07-28 | 北京科技大学 | A kind of data acquisition equipment and acquisition method |
| CN109163973A (en) * | 2018-09-30 | 2019-01-08 | 上海交通大学 | A kind of thin-wall tube sample loading device |
| CN109884124A (en) * | 2019-02-23 | 2019-06-14 | 西安科技大学 | A kind of caliberating device of immersion method crack propagation signal |
| CN112179948A (en) * | 2020-09-29 | 2021-01-05 | 中国航发动力股份有限公司 | Flaw detection device and application thereof |
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2013
- 2013-09-05 CN CN201320551774.4U patent/CN203414049U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994715A (en) * | 2014-06-04 | 2014-08-20 | 宁波市鄞州富春精密铸造有限公司 | Device and method for measuring minimum diameter of diameter shrinkage portion of tensile sample after fracture |
| CN103994715B (en) * | 2014-06-04 | 2016-08-24 | 宁波市鄞州富春精密铸造有限公司 | Contracting position, footpath minimum diameter measurement apparatus and measuring method after tensile sample fracture |
| CN104198281A (en) * | 2014-08-13 | 2014-12-10 | 中国石油天然气集团公司 | Data acquisition system of wide plate tension test machine |
| CN104198281B (en) * | 2014-08-13 | 2016-10-19 | 中国石油天然气集团公司 | A kind of wide plate test machine data collecting system |
| CN106989844A (en) * | 2017-04-26 | 2017-07-28 | 北京科技大学 | A kind of data acquisition equipment and acquisition method |
| CN109163973A (en) * | 2018-09-30 | 2019-01-08 | 上海交通大学 | A kind of thin-wall tube sample loading device |
| CN109884124A (en) * | 2019-02-23 | 2019-06-14 | 西安科技大学 | A kind of caliberating device of immersion method crack propagation signal |
| CN112179948A (en) * | 2020-09-29 | 2021-01-05 | 中国航发动力股份有限公司 | Flaw detection device and application thereof |
| CN112179948B (en) * | 2020-09-29 | 2024-04-12 | 中国航发动力股份有限公司 | Flaw detection device and application thereof |
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