CN104990975A - Green sand water content rapid measurement device and water content acquisition method based on the same - Google Patents
Green sand water content rapid measurement device and water content acquisition method based on the same Download PDFInfo
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- CN104990975A CN104990975A CN201510385552.3A CN201510385552A CN104990975A CN 104990975 A CN104990975 A CN 104990975A CN 201510385552 A CN201510385552 A CN 201510385552A CN 104990975 A CN104990975 A CN 104990975A
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Abstract
The invention discloses a green sand water content rapid measurement device and a water content acquisition method based on the same, relates to the field of casting green sand and solves the problems that when the green sand water content is tested, existing green sand water content testers are low in measurement speed, poor in measurement result repeatability and accuracy and high in testing environment requirement. The device is composed of a digital oscilloscope, a computer, a high frequency arbitrary waveform generator, two BNC tee joints, a dedicated probe, a green sand sample, five coaxial transmission lines and the like, under the control of the computer, the high frequency arbitrary waveform generator is adopted for sending out high frequency pumping signals, the high frequency pumping signals act on the green sand sample to be tested through the coaxial transmission lines, the tee joints and the dedicated probe, the pressure drop between the two tee joints is collected through the digital oscilloscope which is high in collection rate, and the water content is calculated out precisely through the computer according to a water content calculating model. By means of the device and the method, errors caused by variation of green sand additives and the environment temperature in the existing green sand water content testers are greatly reduced, the test error of the green sand water content is made to be smaller than 2.5%, and the device and the method are applicable to rapid measurement on the green sand water content.
Description
Technical field
What the present invention relates to is casting green-sand moisture measurement field, is specifically related to a kind of green sand moisture rapid measurement device and the water cut acquisition methods based on device.
Background technology
Performance and the casting quality of green-sand are closely related, and it directly affects the quality of casting mold in casting process, the dimensional accuracy etc. of die cavity, and then produce material impact to casting quality.Water cut is the important composition parameter of green-sand, and being also affects one of the most key parameter to cast properties.The quality that green-sand moisture controls is directly connected to the quality of foundry goods, and accurately and fast measuring green sand moisture is the important means improving casting quality, reduce casting wasted product rate.
At present, the rapid measurement device of green sand moisture is measured mainly based on electric-resistivity method, capacitance method and inductance method etc.Wherein, electric-resistivity method and capacitance method are under alternating current source incentive action, by measuring green-sand resistance value or capacitance, then carry out the size of indirect calculation water cut according to the existing relation between the water cut of green-sand and resistance value or capacitance.But, the potpourri of a kind of complexity that green-sand is made up of silica sand, bentonitic clay, water, coal dust and multiple additives, therefore, containing uncertain conductance factors such as such as clay, coal dust, carbonate in green-sand, these factors have had a strong impact on the Measurement accuracy of resistance value or capacitance, cause the precision of the green sand moisture proving installation based on electric-resistivity method or capacitance method greatly to reduce.It is very large that inductance method is subject to green-sand compact rate of molding, temperature and the impact such as accrete kind and content, and the acquisition of signal is comparatively subject to the impact of peripheral electromagnetic field, and take certain measure in using though actual, precision and reliability are also relative poor.In addition, the requirement detected real-time green-sand is also more and more higher, therefore, develops a kind of rapid measurement device of green sand moisture and the fast acquiring method of water cut particularly important for the quality promoting green-sand.
Summary of the invention
The present invention is in order to solve existing green sand moisture tester when testing green sand moisture, have that measuring speed is slow, the repeatability of measurement result and poor accuracy, the problems such as high are required to test environment, propose a kind of green sand moisture rapid measurement device and the water cut acquisition methods based on device.
Green sand moisture rapid measurement device it comprise digital oscilloscope, computing machine, high frequency AWG (Arbitrary Waveform Generator), two BNC three-way connections, dedicated probe, green-sand sample, five coaxial transmission lines, the signal output part of described digital oscilloscope and the signals collecting input end of computing machine are electrically connected, the control signal output terminal of computing machine and the control signal input end of high frequency AWG (Arbitrary Waveform Generator) are electrically connected, waveform and the frequency that high frequency AWG (Arbitrary Waveform Generator) exports high-frequency signal is controlled by computing machine, the high-frequency signal output terminal of high frequency AWG (Arbitrary Waveform Generator) is electrically connected by the high-frequency signal input end of coaxial transmission line and first BNC three-way connection, a high-frequency signal output terminal of first BNC three-way connection is electrically connected by the high-frequency signal input end of coaxial transmission line and second BNC three-way connection, a high-frequency signal output terminal of first BNC three-way connection is electrically connected by a high-frequency signal input end of coaxial transmission line and digital oscilloscope, a high-frequency signal output terminal of second BNC three-way connection is connected with dedicated probe by coaxial transmission line, another high-frequency signal output terminal of second BNC three-way connection is electrically connected by another high-frequency signal input end of coaxial transmission line and digital oscilloscope, dedicated probe inserts in tested green-sand sample.
Dedicated probe it comprise probe framework, four probes, copper rings, a described probe is vertically mounted on the center of probe framework, and be electrically connected with the center conductor of coaxial transmission line, other three probes are vertically mounted on probe framework circumferentially, other three probes link into an integrated entity by copper ring, and are electrically connected with the shielded conductor of coaxial transmission line.
The green sand moisture acquisition methods of green sand moisture rapid measurement device comprises the following steps:
Step one, by vertical for dedicated probe, all insert in tested green-sand sample or casting mold;
Step 2, by computing machine, the frequency of high-frequency signal is located at 100MHz, waveform is set to sine wave;
Step 3, computing machine send control signal to high frequency AWG (Arbitrary Waveform Generator), start high frequency AWG (Arbitrary Waveform Generator);
Step 4, high frequency AWG (Arbitrary Waveform Generator) send the sine wave of 100MHz, and sine wave is carried on dedicated probe by coaxial transmission line and BNC three-way connection;
Step 5, in four probes of dedicated probe, form electromagnetic field, and be reflected back in coaxial transmission line;
Step 6, poor because being reflected in coaxial transmission line two ends coating-forming voltage, this voltage difference is gathered by the high-frequency signal input end of digital oscilloscope, and sends to computing machine by signal output part;
Step 7, computing machine store the signal received and analyze, and the green sand moisture computation model through prestoring obtains the water cut of green-sand to be measured.
Beneficial effect: under the control of the computer, high frequency AWG (Arbitrary Waveform Generator) is adopted to send high-frequency excitation signal, pass through coaxial transmission line, on three-way connection and the tested green-sand sample of dedicated probe effect, pressure drop between two three-way connections is by the digital oscilloscope collection of high acquisition rate, and accurately obtain water cut by computing machine according to water cut computation model, not only greatly reduce the error that existing green sand moisture tester brings because of green-sand condiment and variation of ambient temperature, and avoid automaticity low, because signal acquisition rate produces the problem of additive error not, thus make the test error of green sand moisture be less than 2.5%.
Accompanying drawing explanation
Fig. 1 is the green sand moisture rapid measurement device structural representation described in embodiment one and embodiment five.
Embodiment
Embodiment one, composition graphs 1 illustrates this embodiment, green sand moisture rapid measurement device described in this embodiment comprises digital oscilloscope 1, computing machine 2, high frequency AWG (Arbitrary Waveform Generator) 3, BNC three-way connection 4 and 5, dedicated probe 6, green-sand sample 7, transmission line 8, 9, 10, 11 and 12, the signal output part of described digital oscilloscope 1 and the signals collecting input end of computing machine 2 are electrically connected, the control signal output terminal of computing machine 2 and the control signal input end of high frequency AWG (Arbitrary Waveform Generator) 3 are electrically connected, waveform and the frequency that high frequency AWG (Arbitrary Waveform Generator) 3 exports high-frequency signal is controlled by computing machine 2, the high-frequency signal output terminal of high frequency AWG (Arbitrary Waveform Generator) 3 is electrically connected by the high-frequency signal input end 4-1 of transmission line 8 with BNC three-way connection 4, a high-frequency signal output terminal 4-2 of BNC three-way connection 4 is electrically connected by the high-frequency signal input end 5-1 of transmission line 9 with BNC three-way connection 5, another high-frequency signal output terminal 4-3 of BNC three-way connection 4 is electrically connected by the high-frequency signal input end 1-1 of transmission line 12 with digital oscilloscope 1, a high-frequency signal output terminal 5-2 of BNC three-way connection 5 is connected with dedicated probe 6 by transmission line 10, another high-frequency signal output terminal 5-3 of BNC three-way connection 5 is electrically connected by another high-frequency signal input end 1-2 of transmission line 11 with digital oscilloscope 1, dedicated probe 6 inserts in tested green-sand sample 7.
The difference of the green sand moisture rapid measurement device described in embodiment two, this embodiment and embodiment one is, the high-frequency signal that described high frequency AWG (Arbitrary Waveform Generator) 3 sends is the sine wave signal of 100MHz.
The difference of the green sand moisture rapid measurement device described in embodiment three, this embodiment and embodiment one is, described transmission line 8,9,10,11 and 12 for characteristic impedance be the coaxial transmission line of 50 Ω.
The difference of the green sand moisture rapid measurement device described in embodiment four, this embodiment and embodiment one is, the sampling rate of described digital oscilloscope 1 is not less than 2.5GS/s.
Embodiment five, composition graphs 1 illustrates this embodiment, this embodiment is with the difference of the green sand moisture rapid measurement device described in embodiment one, described dedicated probe 6 it comprise probe framework 6-1, four probe 6-2, 6-3, 6-4 and 6-5, copper ring 6-6, described probe 6-2 is vertically mounted on the center of probe framework 6-1, described probe 6-3, 6-4 and 6-5 is vertically mounted on probe framework 6-1 circumferentially, described copper ring 6-6 is by three probe 6-3, 6-4 and 6-5 links into an integrated entity, described probe 6-2 and the center conductor of coaxial transmission line 10 are electrically connected, described copper ring 6-6 and the shielded conductor of coaxial transmission line 10 are electrically connected.
The difference of the green sand moisture rapid measurement device described in embodiment six, this embodiment and embodiment five is, the material of described probe framework 6-1 is the good teflon of insulating property, equal 304 stainless steels of material of described probe 6-2,6-3,6-4 and 6-5, the end of probe is pointed shape.
The difference of the green sand moisture rapid measurement device described in embodiment seven, this embodiment and embodiment five is, described probe 6-3,6-4,6-5 be arranged on diameter centered by probe 6-2 for 60mm circumferentially, and be mutually 120 ° of distributions.
The difference of the green sand moisture rapid measurement device described in embodiment eight, this embodiment and embodiment five is, the length of described probe 6-2,6-3,6-4 and 6-5 is 100mm, and diameter is 3mm.
In present embodiment, under the control of the computer, high frequency AWG (Arbitrary Waveform Generator) is adopted to send high-frequency excitation signal, pass through coaxial transmission line, on three-way connection and the tested green-sand sample of dedicated probe effect, pressure drop between two three-way connections is by the digital oscilloscope collection of high acquisition rate, and accurately obtain water cut by computing machine according to water cut computation model, not only greatly reduce the error that existing green sand moisture tester brings because of green-sand condiment and variation of ambient temperature, and avoid automaticity low, because signal acquisition rate produces the problem of additive error not.
Embodiment nine, to comprise the following steps based on the green sand moisture acquisition methods of the green sand moisture rapid measurement device described in embodiment one:
Step one, by vertical for dedicated probe 6, all insert in tested green-sand sample 7;
Step 2, by computing machine 2, the frequency of high-frequency signal is located at 100MHz, waveform is set to sine wave;
Step 3, computing machine 2 send control signal to high frequency AWG (Arbitrary Waveform Generator) 3, start high frequency AWG (Arbitrary Waveform Generator) 3;
Step 4, high frequency AWG (Arbitrary Waveform Generator) 3 send the sine wave of 100MHz, and sine wave is carried on dedicated probe 6 by coaxial transmission line 8,9,10 and BNC three-way connection 4,5;
Step 5, in four probes of dedicated probe 6, form electromagnetic field, and be reflected back in coaxial transmission line 10 and 9;
Step 6, poor because being reflected in coaxial transmission line 9 two ends coating-forming voltage, this voltage difference is gathered by high-frequency signal input end 1-1,1-2 of digital oscilloscope 1, and sends to computing machine 2 by signal output part;
Step 7, computing machine 2 store the signal received and analyze, and the green sand moisture computation model through prestoring obtains the water cut of green-sand sample to be measured, and this computation model is,
for the water cut of green-sand sample,
for computing machine 2 sends according to digital oscilloscope 1 voltage difference that signal tries to achieve.
In present embodiment, to clay content 5%, coal dust content 5%, the green-sand that water cut is different is tested, and test result is as follows,
Claims (9)
1. green sand moisture rapid measurement device, it is characterized in that, comprise digital oscilloscope (1), computing machine (2), high frequency AWG (Arbitrary Waveform Generator) (3), BNC three-way connection (4) and (5), dedicated probe (6), green-sand sample (7), transmission line (8), (9), (10), and (12) (11), the signal output part of described digital oscilloscope (1) and the signals collecting input end of computing machine (2) are electrically connected, the control signal output terminal of computing machine (2) and the control signal input end of high frequency AWG (Arbitrary Waveform Generator) (3) are electrically connected, waveform and the frequency that high frequency AWG (Arbitrary Waveform Generator) (3) exports high-frequency signal is controlled by computing machine (2), the high-frequency signal output terminal of high frequency AWG (Arbitrary Waveform Generator) (3) is electrically connected by the high-frequency signal input end (4-1) of transmission line (8) with BNC three-way connection (4), a high-frequency signal output terminal (4-2) of BNC three-way connection (4) is electrically connected by the high-frequency signal input end (5-1) of transmission line (9) with BNC three-way connection (5), (1-1 is electrically connected by a high-frequency signal input end of transmission line (12) and digital oscilloscope (1) for another high-frequency signal output terminal (4-3) of BNC three-way connection (4), (5-2 is connected with dedicated probe (6) by transmission line (10) a high-frequency signal output terminal of BNC three-way connection (5), another high-frequency signal output terminal (5-3) of BNC three-way connection (5) is electrically connected by transmission line (11) another high-frequency signal input end (1-2) with digital oscilloscope (1), dedicated probe (6) inserts in tested green-sand sample (7).
2. green sand moisture rapid measurement device according to claim 1, is characterized in that, the high-frequency signal that described high frequency AWG (Arbitrary Waveform Generator) (3) sends is the sine wave signal of 100MHz.
3. green sand moisture rapid measurement device according to claim 1, is characterized in that, described electric transmission line (8), (9), (10), (11) and (12) for characteristic impedance be the coaxial transmission line of 50 Ω.
4. green sand moisture rapid measurement device according to claim 1, is characterized in that, the sampling rate of described digital oscilloscope (1) is not less than 2.5GS/s.
5. green sand moisture rapid measurement device according to claim 1, it is characterized in that, described dedicated probe (6) it comprise probe framework (6-1), four probes (6-2), (6-3), (6-4) with (6-5), copper ring (6-6), described probe (6-2) is vertically mounted on the center of probe framework (6-1), described probe (6-3), (6-4) probe framework (6-1) is vertically mounted on circumferentially with (6-5), described copper ring (6-6) is by three probes (6-3), (6-4) link into an integrated entity with (6-5), described probe (6-2) is electrically connected with the center conductor of coaxial transmission line (10), described copper ring (6-6) is electrically connected with the shielded conductor of coaxial transmission line (10).
6. green sand moisture rapid measurement device according to claim 5, it is characterized in that, the material of described probe framework (6-1) is the good teflon of insulating property, equal 304 stainless steels of material of described probe (6-2), (6-3), (6-4) and (6-5), the end of probe is pointed shape.
7. green sand moisture rapid measurement device according to claim 5, is characterized in that, described probe (6-3), (6-4) (6-5) diameter be arranged on centered by probe (6-2) be 60mm circumferentially, and be mutually 120 ° of distributions.
8. green sand moisture rapid measurement device according to claim 5, is characterized in that, the length of described probe (6-2), (6-3), (6-4) and (6-5) is 100mm, and diameter is 3mm.
9., based on the green sand moisture acquisition methods of green sand moisture rapid measurement device according to claim 1, it is characterized in that, it comprises the following steps:
Dedicated probe (6) vertically, is all inserted in tested green-sand sample (7);
By computing machine (2), the frequency of high-frequency signal is located at 100MHz, waveform is set to sine wave;
Computing machine (2) sends control signal to high frequency AWG (Arbitrary Waveform Generator) (3), starts high frequency AWG (Arbitrary Waveform Generator) (3);
High frequency AWG (Arbitrary Waveform Generator) (3) sends the sine wave of 100MHz, and sinusoidal wave coaxial transmission line (8), (9), (10) and BNC three-way connection (4), (5) passed through are carried on dedicated probe (6);
In four probes of dedicated probe (6), form electromagnetic field, and be reflected back and belong to together in transmission line (10) and (9);
Because to be reflected in coaxial transmission line (9) two ends coating-forming voltage poor, this voltage difference by the high-frequency signal input end (1-1) of digital oscilloscope (1), (1-2) collection, and sends to computing machine (2) by signal output part;
Computing machine (2) stores the signal received and analyzes, and the green sand moisture computation model through prestoring obtains the water cut of green-sand sample to be measured.
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Application publication date: 20151021 |