CN1017648B - Rapid test method for three performance parameters of wet moulding sand the tester thereof - Google Patents
Rapid test method for three performance parameters of wet moulding sand the tester thereofInfo
- Publication number
- CN1017648B CN1017648B CN 90107434 CN90107434A CN1017648B CN 1017648 B CN1017648 B CN 1017648B CN 90107434 CN90107434 CN 90107434 CN 90107434 A CN90107434 A CN 90107434A CN 1017648 B CN1017648 B CN 1017648B
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- sand
- cylinder
- compression strength
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Abstract
The present invention relates to a rapid testing method for the three performance parameters of green molding sand and a tester thereof. In the method, samples for testing compactability are directly used for measuring air permeability pressure and green compression strength, and then, the air permeability and the green compression strength of a standard technical sample are calculated through binary linear relationships. In the tester, a displacement sensor is used for measuring the compactability, a pressure sensor is used for measuring the green compression strength, an air pressure sensor is used for measuring the air permeability, and all actions are driven by air pressure. The collection, the processing and the calculation of detection signals and the final result printing are all automatically executed under the control of a microcomputer. The rapid testing method is simple, rapid an d accurate, and the tester has the advantages of simple structure and easy operation.
Description
The invention belongs to the method and the instrument thereof that detect moulding-sand property in the casting industry, particularly a kind of rapid test method for three performance parameters of wet moulding sand and analyzer thereof of measuring the green-sand degree of packing, gas penetration potential and green compression strength is suitable for molding sand production line or sand laboratory's fast measuring moulding-sand property and uses.
Along with making rapid progress of science and technology, the moulding-sand property assay method of traditional standard and instrument thereof can not adapt to the situation requirement of casting industry fast development.For this reason, many founder authors are just making great efforts to seek new assay method and relevant detection instrument.New through looking into, existing in the prior art five kinds of moulding-sand property automatic detection devices: the one, the development of U.S. Dieter company, be published in the moulding-sand property automatic analyzer that can on same sample, measure sand temperature, moisture, gas penetration potential, wet pressing or green shear strength and wet pressing distortion that the U.S. casts the 353rd～359 page of Shi Xiehui 1967 annual (AFS Transac-tion); The 2nd, " research " the moulding-sand property pick-up unit that a literary composition is proposed of the automatic fast detecting of molding sand three performances that China's " foundry machinery " magazine second phase in 1984 delivers; The 3rd, the moulding-sand property automatic detection device that Japan's " casting thing " magazine the 57th volume is delivered for No. 10; Four and five is automatic Detection ﹠ Controling instrument of Chinese utility model patent ZL87210094 and disclosed wet sand performance automatic detection device of ZL88211114 and molding sand six performances.The feature of said apparatus is had nothing in common with each other, but roughly the same on the primary structure principle, and the preparation sand test specimen all is to adopt the mode that presses down, and presses sand head and test specimen tube that higher quality of fit must be arranged, otherwise burning into sand can take place, and increases frictional resistance, influences test findings.These devices all adopt travel switch to control the test specimen tube sand pack height, and accuracy is relatively poor.In addition, said apparatus all can not detect sand compaction, gas penetration potential and green compression strength simultaneously, and these three performances are the conventional projects that must examine in the domestic and international molding sand check, therefore is difficult to adapt to application request.In said apparatus, first and second kinds of devices all adopt the method making sand test specimen of traditional standard to carry out Performance Detection, are difficult to reach the purpose of fast measuring; The third device is to converse compressive strength with the skin hardness that detects sand test specimen, and its error amount is bigger; The 4th and the 5th kind the device measured performance number lacked the molding sand green compression strength again.These above-mentioned problems are the major defect of existing moulding-sand property automatic detection device existence just.
The objective of the invention is to overcome the deficiency of prior art, provide a kind of simple, quick, accuracy of detection is high and can detect the three performance parameters of wet moulding sand assay method and the analyzer thereof of compact rate of molding, gas penetration potential and green compression strength.
Task of the present invention is achieved in that
The present invention cancels the traditional standard method is wanted the higher standard technology sample (50 ± 0.2 * 50 ± 1 millimeter of φ) of other preparation size accuracy requirement when measuring gas penetration potential and green compression strength tired lock process, directly the sand test specimen behind the utilization test compact rate of molding is measured ventilative pressure and green compression strength, utilize the binary linearity relation that exists between measured ventilative pressure of this ventilative pressure and green compression strength and employing standard technology sample and the green compression strength to try to achieve the ventilative pressure and the green compression strength of standard technology sample then, the conversion pressure of will breathing freely again at last becomes air penetrability just to try to achieve the standard compact rate of molding of this molding sand, gas penetration potential and green compression strength.
Above-mentioned method is to adopt following analyzer to carry out: as depicted in figs. 1 and 2, this analyzer is mainly by testing agency, operation valve and microsystem are formed, the funnel of this testing agency (23) places test specimen tube (13) top, be provided with screen cloth (22) and pneumatic group of sand plate (21) on the top of funnel (23), in funnel (23) both sides stragith edge (26) is housed, a pressure transducer (25) and a compaction cylinder (19) that has displacement transducer (17) respectively are set in the both sides of funnel (23), funnel (23), pressure transducer (25) and compaction cylinder (19) are fixed on the station cylinder (24), concentric is provided with a prosposition cylinder (8) from top to bottom in the lower end of test specimen tube (13), a sample is released a cylinder (6) and a reset cylinder (2), the piston rod (4) of reset cylinder (2) passes sample and releases cylinder (6) bottom, stretching into sample when up releases in the cylinder (6), the piston rod (7) that sample is released cylinder (6) passes prosposition cylinder (8) and piston (9) thereof and is positioned at test specimen tube (13) and follows test specimen tube (13) the work sand head (10) that pushes away movingly to be connected, be no more than greater than the thickness that pushes away sand head (10) in the lower height of test specimen tube (13) on this section barrel at the top of present position when pushing away sand head (10) and adding sand and open an air admission hole (12) and venthole (27), air admission hole (12) is connected with gas penetration potential fan blower (11), and venthole (27) is connected with baroceptor (28).
Principle of the present invention is such: through a large amount of tests, ventilative pressure that records with method of the present invention and green compression strength and the ventilative pressure that records with the standard technology sample and green compression strength exists as the binary linearity of figure three, figure four concerns, try to achieve following relation formula by binary linear regression equation:
H
3＝-11.44+0.2597×D+1.0567×H
1
σ
3＝1-0.021×D+1.55×σ
1
In the formula: H
3Ventilative pressure (millimeter of water) for the standard technology sample
σ
3Green compression strength (* 10 for the standard technology sample
5Handkerchief)
D is molding sand compact rate of molding (%)
H
1Be the ventilative pressure (millimeter) that records with the compact rate of molding sample
σ
1Be the green compression strength (* 10 that records with the compact rate of molding sample
5Handkerchief)
According to above-mentioned formula, as long as the ventilative pressure H that measures compact rate of molding D and record with the compact rate of molding sample
1And green compression strength σ
1Can try to achieve with the measured ventilative pressure H of standard technology sample
3With green compression strength σ
3, the following formula of ventilative pressure substitution, just try to achieve air penetrability Q again:
Q=9792.56/ (H
3)-60(works as H
3≤ 60)
Q=256.2-2.583 * H
3(work as H
3≤ 76)
Q=217-2.06 * H
3(work as H
3≤ H
1)
The said determination data can be tried to achieve measured compact rate of molding, gas penetration potential and the green compression strength of moulding-sand property assay method of closing the symbol traditional standard fast by the diagram method conversion or with MICROCOMPUTER PROCESSING.
The principle of work of the analyzer that the present invention is used is such: whole actions of this analyzer, comprise that collection, processing, the computing of detection signal reaches to print result, and all under system controlled by computer, carry out automatically.The A mouth of IO interface able to programme (P10) is done the input port, receives the signal that each moving component puts in place, feeds back B mouth to P10 through CPU, outputs signal to control circuit board, connects corresponding relays and solenoid valve, carries out the indicated action of signal.The signal that each sensor spreads out of enters CPU after analog to digital converter (A/D) conversion, handled by CPU, after the computing testing result is got by printer.
During work, pneumatic group of sand plate (21) rotates and dials sand, molding sand, passes through funnel (23) guiding again and falls into test specimen tube (13) with falling into funnel (23) through screen cloth (22) mesh.Through certain hour add sand after, station cylinder (24) action, with compaction cylinder (19) move to test specimen tube (13) directly over, meanwhile, along with moving of funnel (23), stragith edge (26) will exceed the molding sand of test specimen tube (13) and scrape to the interior discharge of skewed slot (29).Compaction cylinder (19) action subsequently is about to press under the piston (20) in sand head (15) the pressing in sample tube (13) molding sand is carried out compacting.Compaction cylinder (19) can produce the pressure that the specific pressure that produced with the conventional model machine three hammer consolidation methods of dashing equates, its value is 3.6 * 10
5Handkerchief.Because the height value relation of being in line of compact rate of molding and sand test specimen is therefore when pressing sand head (15) to carry out computing and get the compact rate of molding value through analog to digital converter (A/D) input computing machine from the signal alpha that displacement transducer (17) spreads out of when stopping to press down.Through experiment confirm, it is identical (see figure 5) that this compact rate of molding value is used towards the measured compact rate of molding value of model machine three hammering blow compactings with the traditional standard method.Measure after the compact rate of molding, the piston (5) of sample release cylinder (6) is descending, drive pushes away sand head (10) and drops to test specimen tube (13) bottom, open the air admission hole (12) and the venthole (27) that are pushed sand head (10) sealing, then gas penetration potential fan blower (11) is toward air admission hole (12) air feed, gas enters in the test specimen tube (13) of sand test specimen bottom, discharge outward in sand grains gap in sand test specimen, its ventilative pressure is measured by baroceptor (28), output signal b, the machine computing draws the gas penetration potential value and gets the result as calculated.Measure after the gas penetration potential, station cylinder (24) action, pressure transducer (25) is placed directly over the test specimen tube (13), and sample is released cylinder (6) action subsequently, and piston (5) rises, sand test specimen is released test specimen tube (13), behind sand test specimen contact pressure sensor (25), piston (5) slowly rises, and sample is exerted pressure damaged by pressure until sand test specimen, by the signal c of pressure transducer (25) output, the machine computing draws the green compression strength value and prints the result as calculated.After the above-mentioned performance measurement, prosposition cylinder (8) action, piston (9) comes downwards to the bottom, and the piston rod (7) that makes sample release cylinder (6) moves down certain distance, and the upper surface that pushes away sand head (10) is flushed with test specimen tube (13) upper surface.Then station cylinder (24) action, make funnel (23) be returned to test specimen tube directly over.Meanwhile, stragith edge (26) sand test specimen that will damage by pressure is scraped to skewed slot (29) and is discharged.Reset cylinder (2) action subsequently, piston (3) goes upward to the extreme higher position, piston (5) dropping distance is limited, be that piston (5) descends at last, just stop that pushing away sand head (10) present position and be the original position this moment until running into piston rod (4) top, (this highly is the sand pack height of standard sample to make each detection can both obtain constant sand pack height, its value is 120 millimeters), so far just finish whole testing process, recover virgin state.
Description of drawings:
Fig. 1 is the structural principle synoptic diagram of green-sand compact rate of molding of the present invention, gas penetration potential and green compression strength three performance fast measuring instrument.
Fig. 2 is the microsystem block diagram.
Fig. 3 is the graph of a relation of ventilative pressure of compact rate of molding sample and the ventilative pressure of standard sample.
Fig. 4 is the graph of a relation of compact rate of molding sample green compression strength and standard sample green compression strength.
Fig. 5 is the graph of a relation of compact rate of molding and compact rate of molding specimen height.
The present invention compared with prior art has the following advantages:
1. can go out molding sand compact rate of molding, gas permeability and three performances of green compression strength by automatic And Rapid Determination, adapt to the conventional detection requirement.
2. the compact rate of molding that determines, gas permeability and green compression strength are identical with the value that the method for traditional standard is measured, and are convenient to comparison and exchange.
3. this analyzer mensuration compact rate of molding is to adopt upper pressure mode, is difficult between pressure head and the test specimen tube producing the burning into sand phenomenon, can guarantee the sample Compression Stability.
4. this analyzer adopts air pressure to drive, and can directly utilize the source of the gas in factory or workshop, therefore can reduce manufacturing cost and use cost, and the reliability of instrument and durability are all higher.
5. this analyzer is simple in structure, compact, cost is low, easy to implement.
This analyzer external form is neat, attractive in appearance in order to make, test specimen tube (13), prosposition cylinder (8), sample are released cylinder (5), reset cylinder (2), skewed slot (29) and air-valve assembly (1) and placed in the instrument container (30), and its top is established a platform (27) that flushes with test specimen tube (13) top and covered.Station cylinder (24) can be supported on instrument container (30) top by support (14) binding of overhanging piston rods in its two ends (16) and both sides, instrument container (30) upper end.
The present invention is suitable for casting department and uses, and particularly uses on the molding sand production line, can obtain to measure fast and automatically and accurately effect.
Claims (3)
1, the rapid assay methods of a kind of green-sand degree of packing, gas penetration potential and green compression strength is characterized in that the ventilative pressure (H of sand test specimen mensuration after compact rate of molding (D) is tested in directly utilization
1) and green compression strength (σ
1), utilizing then should ventilative pressure (H
1) and green compression strength (σ
1) and adopt the measured ventilative pressure (H of standard technology sample
3) and green compression strength (σ
3) between the binary linearity relation that exists: H
3=-11.44+0.2597 * D+1.0567 * H
1σ
3=1-0.021 * D+1.55 * σ 1 tries to achieve the ventilative pressure (H of standard technology sample
3) and green compression strength (σ
3), pressure (H again will breathe freely
3) be converted into air penetrability (Q) by following formula:
Q=9792.56/ (H3)-60 (works as H
3≤ 60)
Q=256.2-2.583 * H
3(work as H
3≤ 76)
Q=217-2.06 * H
3(work as H
3≤ H
1)
Thereby try to achieve standard compact rate of molding, gas penetration potential and the green compression strength of this molding sand.
2, assay method according to claim 1 is characterized in that its data reduction preferably adopts microcomputer to carry out.
3, a kind of green-sand compact rate of molding, gas penetration potential and green compression strength three performance fast measuring instrument, by testing agency, microsystem and solenoid valve are formed, testing agency includes test specimen tube (13), be positioned at the screen cloth (22) and the pneumatic sand plate (21) on funnel (23) top of test specimen tube (13) top and the scraper plate (26) that is arranged at funnel (23) both sides, it is characterized in that respectively being arranged at a pressure transducer (25) and have the compaction cylinder (18) of displacement transducer (17) in funnel (23) both sides, funnel (23), pressure transducer (25) and compaction cylinder (18) are provided with on the station cylinder (24), concentric is provided with a prosposition cylinder (8) from top to bottom in test specimen tube (13) lower end, a sample is released a cylinder (6) and a reset cylinder (2), the piston rod (4) of reset cylinder (2) passes sample and releases cylinder (6) bottom, stretching into sample when up releases in the cylinder (6), the piston rod (7) that sample is released cylinder (6) passes prosposition cylinder (8) and piston (9) thereof and is positioned at the push away sand head (10) of test specimen tube (13) with the cooperation of test specimen tube (13) do and is connected, be no more than greater than the thickness that pushes away sand head (10) in the lower height of test specimen tube (13) on this section barrel at the top of present position when pushing away sand head (10) and adding sand and open an air admission hole (12) and venthole (27), air admission hole (12) is connected with gas penetration potential fan blower (11), and venthole (27) is connected with baroceptor (28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90107434 CN1017648B (en) | 1990-08-31 | 1990-08-31 | Rapid test method for three performance parameters of wet moulding sand the tester thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90107434 CN1017648B (en) | 1990-08-31 | 1990-08-31 | Rapid test method for three performance parameters of wet moulding sand the tester thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1051788A CN1051788A (en) | 1991-05-29 |
| CN1017648B true CN1017648B (en) | 1992-07-29 |
Family
ID=4880545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90107434 Expired CN1017648B (en) | 1990-08-31 | 1990-08-31 | Rapid test method for three performance parameters of wet moulding sand the tester thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017648B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784938A (en) * | 2016-03-14 | 2016-07-20 | 哈尔滨理工大学 | Wet clay sand compactability continuous detection device and compactability acquisition method |
| CN106289973A (en) * | 2016-08-08 | 2017-01-04 | 哈尔滨理工大学 | Green-sand compact rate of molding and wet strength detect device and acquisition methods based on this device |
| CN106092873A (en) * | 2016-08-08 | 2016-11-09 | 哈尔滨理工大学 | The measurement apparatus of green-sand compact rate of molding water content cleavage strength and acquisition methods |
| CN108526394A (en) * | 2018-06-05 | 2018-09-14 | 溧阳市联华机械制造有限公司 | A kind of core mould structure of the main sample cylinder of subsidiary permeability test |
| CN114923781B (en) * | 2022-07-19 | 2022-09-27 | 潍坊市凯隆机械有限公司 | Full-automatic molding sand strength detection device |
| CN116297071A (en) * | 2022-12-05 | 2023-06-23 | 马鞍山海森控电气有限公司 | Air permeability tester for casting molding sand and testing method thereof |
-
1990
- 1990-08-31 CN CN 90107434 patent/CN1017648B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1051788A (en) | 1991-05-29 |
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